FORM TWO CHEMISTRY NECTA MULTIPLE CHOICE(2005-2018)
FORM TWO CHEMISTRY MULTIPLE CHOICE 2020

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA
FORM TWO NATIONAL ASSESSMENT

032 CHEMISTRY

Time: 2:30 HoursYear: 2020

Instructions

1. This paper consists of sections A and B with a total of ten (10) questions.

2. Answer all questions in the spaces provided.

3. Section A carries twenty (20) marks and section B carries eighty (80) marks.

4. All writing must be in black or blue ink except diagrams which must be in pencil.

5. Cellular phones and any unauthorised materials are not allowed in the assessment room.

6. Write your Assessment Number at the top right corner of every page.

7. The following atomic masses may be used: H = 1, N = 14, 0 = 16, S = 32, Ca = 40.

SECTION A (20 Marks)

Answer an questions in this section.

I .For each of the items (1) (x), choose the correct answer from among the given alternatives and write its letter in the box provided.

(i) The net charge inside the nucleus of an atom is contributed by

  1. protons
  2. neutrons
  3. electrons
  4. all nucleons.

(ii) Why oxygen as one of the components of air is unique? 

  1. It support combustion.
  2. It is a diatomic gas.
  3. It forms the largest part of the air.
  4. It has the largest density.

(iii) Which material is not involved in respiration? 

  1. Carbon dioxide  
  2. Nitrogen
  3. Oxygen 
  4. Water

(iv) Which element causes permanent hardness of water when combined with sulphate?

  1. aluminium
  2. magnesium
  3. potassium
  4. sodium.

(v) Carbon dioxide. Oxygen, Nitrogen and Hydrogen Sulphide are 

  1. major components of air.
  2. covalent compounds.
  3. divalent gases.
  4. ionic compounds.

(vi) Which common feature is associated with elements of the same group? 

  1. Equal number of protons
  2. Equal number of electrons
  3. Equal number of valence electrons
  4. Equal number of shells.

(vii) The oxidation state of metallic elements is always

  1. negative
  2. Neutral
  3. positive
  4. zero.

(viii) An isotope of Lead with atomic number of 82 and mass number of 207 has

  1. 82 protons, 125 neutrons and 82 electrons. 
  2. 25 protons, 82 neutrons and 125 electrons.
  3. 82 protons, 207 neutrons and 125 electrons.
  4. 207 protons, 207 electrons and 82 neutrons.

(ix) Which conditions are necessary for iron nails to rust?

  1. oxygen and moisture
  2. carbon and oxygen
  3. carbon dioxide and oxygen
  4. oxygen and nitrogen.

(x) Which decision should be made if the results of an experiment do not support the stated hypothesis?

  1. To use the results as an idea for further testing.
  2. To ignore the results and set a new experiment.
  3. To repeat the experiment in the same way.
  4. To identify a new problem.

7. (a)Why is petrol not recommended to be used as fuel in school laboratories? Briefly explain.


(b) Which three heat sources can be used to boil some water in the laboratory instead of the Bunsen burner?


(c) Arrange the following steps for lighting the Bunsen burner in a correct sequence using letter

A to F.

  1. Turn the collar to close the air hole completely.
  2. Turn on the gas fully to ensure that plenty of gas is entering the burner.
  3. Connect the Bunsen burner to the gas mains.
  4. Adjust the gas tap until the supply of gas is enough for a time.
  5. Light the gas at the top of the barrel with a lighted matchstick.
  6. Close the air hole.

Answer

Step 1 2 3 4 5 6
Letter






8. (a)Giving a reason, state whether rust will form or not in each of the situations (i) - (vi).

  1. Iron bar is dipped into boiling water.
  2. Painted iron bar is dipped into un-boiled water.
  3. Iron bar is dipped in un-boiled water.
  4. Oiled iron bar is left outside the room over nights.
  5. Aluminium wire is dipped in un-boiled water.
  6. A dry iron bar is wrapped with cotton wool.

(b)Briefly explain any four methods of preventing rusting.


9(a)Write chemical formulae of the two compounds from which oxygen gas can be prepared by decomposition.


(b)What are the three physical properties of oxygen gas?


(c) Why is it important to have abundant oxygen gas on the Earth? Give five reasons.


10. Identify the five accidents which are common in the laboratory and in each explain possible causes and preventive measures to be taken.


2. (a)Match each item in List A with a correct response in List B by writing the letter of the correct response below the corresponding item number in the table provided.

List A List B

(i) An element with atomic number

(ii) The type of bonding which occurs between non metals.

(iii) Elements in the Periodic Table found in groups IV to VII.

(iv) Vertical columns of the Periodic Table.

(v) Elements which react vigorously with water
  1. Groups
  2. Group 1
  3. Ionic bonding
  4. Metals
  5. Noble gas
  6. Non-metals
  7. Covalent bonding
  8. Halogen

(b) Answer the given questions by writing the correct answer in the blank spaces provided.

(i) In which stage is the hypothesis tested during scientific investigation? . . . . . . . . . . . . . . . . .

(ii) On which factor does the physical state of a molecule depend?  . . . . . . . . . . . . . . . . . 

(iii) Which properties depend on the proportions of mixing substances in a mixture? . . . . . . . . . . . . . . . . . 

(iv) What are the building blocks of matter?  . . . . . . . . . . . . . . . . . 

(v) Which particles are transferred during chemical reactions? . . . . . . . . . . . . . . . . .


SECTION B (80 Marks)

Answer all questions in this section.

3. (a) Why candles are not suitable for heating in the laboratory? Give two reasons.


(b) Differentiate luminous from non-luminous flame by giving five points.


4. (a) State four main ideas of the Dalton's atomic theory of matter.


(b)Classify each of the following elements into their respective groups and periods.

SIN

Element

Group

Period

(i) 

Calcium

 

 

(ii) 

Hydrogen

 

 

(iii) 

Chlorine

 

 

(iv) 

Boron

 

 

(v) 

Aluminium

 

 

5. (a)With an example for each, give two fields in which the scientific procedure is applied.


(b) Categorize the three factors (variables) which affect the problem being investigated during scientific investigation.


6, (a) Briefly explain why:

(i) the use of charcoal is harmful to the environment.

(ii)charcoal is still being used by majority of Tanzanians for domestic purposes.


(b) A mass of 20.0 g of petrol was burnt in air. The heat produced was used to heat 2.5 litres of water. Given that the heat value of petrol is 43,640 kJ/kg, by how much the temperature of water could have changed? (The specific heat capacity of water = 4.18 Id kg-1 K-1, Density of water = 1000 kg/m3).


(c) Arrange the following steps for lighting the Bunsen burner in a correct sequence using letter

A to F.

  1. Turn the collar to close the air hole completely.
  2. Turn on the gas fully to ensure that plenty of gas is entering the burner.
  3. Connect the Bunsen burner to the gas mains.
  4. Adjust the gas tap until the supply of gas is enough for a time.
  5. Light the gas at the top of the barrel with a lighted matchstick.
  6. Close the air hole.

Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2019

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA

FORM TWO NATIONAL ASSESSMENT

032   CHEMISTRY

Duration: 2:30 Hours

INSTRUCTIONS. 

  1. This paper consists of sections A and B with a total of ten (10) questions.
  2. Answer all questions in spaces provided.
  3. All writing must be in blue or black ink except drawing which must be in pencil.
  4. Calculators, cellular phones and any unauthorized materials are not allowed in the examination room.
  5. Write your Examination Number at the top right corner of every page.
  6. The following atomic masses may be used; H =1, N =14, O = 16, S = 32, Ca = 40

 

SECTION A (20 Marks)

Answer all questions in this section.

1. For each of the items (i) –(x), choose the correct answer from the among the given alternatives and write its letter in the box provide.

(i) What is the best way of keeping a clean test tube after use?

  1. Keeping it in water
  2. Keeping it on a test tube holder
  3. Keeping it in a basin for test tubes
  4. Keeping it on a test tube rack.

(ii) Which one of the following does not involve the processes of urban water treatment and purification?

  1. Sedimentation
  2. Distillation
  3. Filtration
  4. Chlorination.

(iii) Why hydrogen gas is not a constituent of air?

  1. Because of being water soluble
  2. Because of being denser than air
  3. Because of being very light
  4. Because of being highly flammable.

(iv) Which is the suitable alternative heat source to be used in absence of Bunsen Burner?

  1. Torch and spirit burner
  2. Torch and kerosene stove
  3. Kerosene stove and spirit burner
  4. Firewood and torch.

(v) Which group and period does the element with 11 electrons belong?

  1. Group I and period 3
  2. Group II and period 1
  3. Group I and period 1
  4. Group II and period 3.

(vi) What happens when substance A reacts with substance B to form a new substance C?

  1. Substance A and B are said to have formed a solution
  2. Substance A and B are said to have undergone a physical change.
  3. Substance A and B are said to have undergone a chemical change.
  4. Substance A and B are said to have undergone a dissolution.

(vii) Which components make fire triangle?

  1. Oxygen, fuel and heat
  2. Oxygen, nitrogen and heat
  3. Oxygen, fuel and carbon dioxide
  4. Oxygen, heat and hydrogen.

(viii) Which state is involved when drying wet clothes?

  1. Liquid to solid
  2. Solid to gas
  3. Gas to liquid
  4. Liquid to gas.

(ix) Which net charge exists in radicals?

  1. Zero
  2. Positive or negative
  3. Neutral
  4. Positive and negative.

 

(x) Why Non – luminous flame is the most applicable flame for heating purposes?

  1. It is very nosy
  2. It has no soot.
  3. It is very hot
  4. It has air holes open

2. (a) Match each item in List A with a correct response in List B by writing the letter of the correct response below the corresponding item number in the table provided.

List A

List B

(i)     A solvent which dissolves most substances to form solution.

(ii)  A substance that has no definite shape or size.

(iii) A substance that has a fixed shape and volume

(iv) A substance whose components can be separated by physical means

(v)   Homogeneous mixture of two or more substances.
  1. Solid
  2. Solution
  3. Water
  4. Sugar
  5. Milk
  6. Gas
  7. Liquid
  8. Air

   (b) Fill in the blank spaces by using the appropriate terms

(i)     In an atom, the effect of the charged nucleons is balanced by the charge of……………..


(ii)  Serum is separated from blood samples by employing a technique called………………..


(iii) Boiling points of substances reflect the strength of……………….


(iv) Grinding chalk into a powder involves changing the state of …………………….


(v)   The insoluble substances formed during filtration are collectively termed as ……………….


SECTION B (80 Marks)

Answer all questions in this section.

3. (a) State one use of each of the items (i) – (x) in administering First Aid.

S/N

Item

Use

(i)      

Soap

 

(ii)   

Bandage

 

(iii)  

Sterile gauze

 

(iv)  

Iodine tincture

 

(v)    

Petroleum jelly

 

(b) Give one function of each of the following apparatus in the chemistry laboratory.

(i) Spatula…………… …………… ……………….


(ii) Gas jar…………… …………….  …… ……….


(iii) Lie – big condenser …………… …… ………… 


(iv) Motor and pestle…… …………… ……………


(v) Wire gauze… ………… ………… …………….


4. (a) By giving one reason, explain the following facts.

(i)     During laboratory preparation of oxygen gas, little manganese dioxide is added to hydrogen peroxide

………… ………… ……… …………… 

………… ……… …………… ……………


(ii)  Fish can obtain oxygen for respiration although spend their lives in water.

…………… …………… ……………

 ………………… …….......... ....... ....


(iii) Oxygen gas can be used for welding activities although it does not burn.

……………… ……………… …… 

…………… ……………………… 


 (b) Which property enables the use of hydrogen gas in: 

(i)     Filling weather balloons?

……………… ………………… ……… ……… 


(ii)  Production of oxy – hydrogen flame?

………… ………… ………………………… ….


 (c) Give two domestic uses of oxygen gas.

(i)     ……………… ……………………… 

(ii)  ……………… ……………………… 


5. (a) Give three chemical tests for water and show the results obtained in each.

(i)     ………… …………… …………………

(ii)  ………… ……………… ………………

(iii) ………… ……………… ………………


(b) (i) Differentiate water treatment from water purification.

……… ……… ……………… … 

……… ……… … ……… ……… 


(ii) Why drinking water should be treated and purified? Give two reasons.

(i)     ………………… ………………… …… 


 (iii) How can drinking water be treated or purified?

(i)     ………… …………………… …… ….

(ii)  …………… ……………… ……… ….

(iii) … ……… ………………… ……… ….


6. (a) Differentiate hypothesis from analysis.

…………… ………………… ……

……… …………………… ………


 (b) Effective use of the four senses of observation is important before a chemist can make conclusion. With four points, show how the senses are used as tools of observation during experimentation by giving one example for each.

(i)     ………… ………… ……………

(ii)  ………… …………… ………….

(iii) ………… ……………… …… ….

(iv) ………… …………… ……………


7. What precautions will you take in handling chemicals having the warning signs shown in the table? Give two precautions in each sign.

S/N

Sign

Relevant Precaution

a)       

C:UsersKYAMBODesktopeplosive.jpg

(i)     ………… ……… …………… ….

(ii)  ………… ………… …………….

b)      

C:UsersKYAMBODesktopflammable.jpg

(i)     …………… …………… ….

(ii)  ………… ………… …… ….

c)       

C:UsersKYAMBODesktop1200px-GHS-pictogram-skull.svg.png

(i)     …… …………… …………….

(ii)  ……… …………… ………….

d)      

C:UsersKYAMBODesktopcorrosive.jpg

(i)     …………… ……………… …….

(ii)  …………… ………… ………….

e)       

C:UsersKYAMBODesktopoxidising.png

(i)     …………… ……… …………….

(ii)  …………… …………… ……….

8. Briefly explain the five classes of fires based on the nature of the burning material and the extinguisher required. Give one example for each class.

a)      ……… ………… ………………… …………………

b)     …………………… ………………………… ……… 


9. A certain gaseous compound contains 30.4% of nitrogen and 69.6% of oxygen by mass. If the molar mass of the compound is 92, calculate its molecular formula. 

Stage

Nitrogen

Oxygen

 

 

………………… ………………… ………………

………………… …………………… …………… 

…………………… …………………… …………


10. Briefly explain five characteristics to be considered when looking for a good fuel.

(i)     ………………… …………………  

(ii)  ………………… …………………  

(iii) ………………… …………………  

(iv) ………………… …………………  

(v)   ……………… ……………………  


Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2018

(i)   Chemistry is a branch of Science which deals with:

  1. matter in relation to energy.
  2.  matter in relation to decomposition.
  3.  matter composition and its decomposition.
  4.  properties of conservation of matter.

Which of the following are the states of matter?

  1. Gas, liquid and mixture
  2. Gas, liquid and solid
  3. Element, compound and mixture 
  4. Element, mixture and gas.

(iii)       Which of the following are the main components of a fire triangle?

  1. Air, temperature and fire
  2.  Oxygen, temperature and fuel 
  3.  Oxygen, heat and fuel
  4. Oxygen, temperature and fire

(iv)       The process of removing solid contaminants from water is known as:

  1.  water decantation.
  2. water solidification. 
  3. water purification.
  4. water sedimentation.

(v)        How many zones are there in a non-luminous flame?

  1. Four zones
  2. Two zones
  3. Three zones
  4. Five zones

(vi)       The process of coating iron or steel with zinc is known as:

  1. zinc painting. 
  2. alloying. 
  3.  tin plating. 
  4.  galvanization.

(vii)     A certain element has atomic number W and mass number Y. The number of neutrons contained in its nucleus is:

  1. W
  2. W-Y
  3. Y-W
  4. Y+W

(viii)    When a small amount of sugar is dissolved in a glass of water the mixture formed is:

  1.  heterogeneous. 
  2. immiscible.
  3.  suspension.  
  4.  homogenous.

(ix)       Fainting is a sudden loss of:

  1. confidence. 
  2. weight of the body. 
  3.  water in the body.  
  4.  consciousness.

(x)        Why is fractional distillation of coal done?

  1.  To remove oxygen in the atmosphere.
  2. To remove volatile matter. 
  3.  To add oxygen in the furnace.
  4. To add volatile matter.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

CHEMISTRY FTNA 2018

(i) Chemistry is a branch of Science which deals with:

  1. matter in relation to energy.
  2. matter in relation to decomposition.
  3. matter composition and its decomposition.
  4.  properties of conservation of matter.

    5. (ii) Which of the following are the states of matter?

    1. Gas, liquid and mixture
    2. Gas, liquid and solid
    3. Element, compound and mixture
    4. Element, mixture and gas.

      5. (iii)Which of the following are the main components of a fire triangle?

      1. Air, temperature and fire
      2. Oxygen, temperature and fuel
      3.  Oxygen, heat and fuel
      4. Oxygen, temperature and fire

        5. (iv)The process of removing solid contaminants from water is known as:

        1. water decantation.
        2. water solidification.
        3. water purification.
        4. water sedimentation.

          5. (v)How many zones are there in a non-luminous flame?

          1. Four zones
          2. Two zones
          3. Three zones
          4. Five zones

            5. (vi)The process of coating iron or steel with zinc is known as:

            1. zinc painting.
            2. alloying.
            3. tin plating.
            4.  galvanization.

              5. (vii)A certain element has atomic number W and mass number Y. The number of neutrons contained in its nucleus is:

              1. W
              2. W-Y
              3. Y-W
              4. Y+W

                5. (viii)When a small amount of sugar is dissolved in a glass of water the mixture formed is:

                1. heterogeneous. 
                2. immiscible.
                3.  suspension. 
                4.  homogenous.

                  5. (ix)Fainting is a sudden loss of:

                  1. confidence. 
                  2. weight of the body. 
                  3.  water in the body. 
                  4.  consciousness.

                    5. (x)Why is fractional distillation of coal done?

                    1.  To remove oxygen in the atmosphere.
                    2. To remove volatile matter. 
                    3.  To add oxygen in the furnace.
                    4. To add volatile matter.

                      5. 2. (a) Match each item in List A with a correct response in List B by writing its letter below the number of the corresponding item in the table provided.

                      LIST A LIST B

                      (i)It occurs between two ions with opposite charges.

                      (ii)It involves the sharing of electrons between atoms.

                      (iii)Shows the simplest ratio of atoms or ions in a compound.

                      (iv)Shows the actual number of each atom in a molecule.

                      (v)A force of attraction that holds atoms together to form molecules.
                      1. Cation
                      2. Anion
                      3. Valency
                      4. Electrovalent bond
                      5. Covalent bond
                      6. Empirical formula 
                      7. Molecular formula 
                      8. Chemical bond

                      (b) Fill in the blank spaces with the correct answer.

                      (i) A reaction that releases energy in the form of light and heat is called..........

                      (ii)A chemical process that occurs in steel and iron in the presence of air and water is known as..........

                      (iii)Oxygen, heat and fuel are the three components that make..........

                      (iv)Injuries that result from the body coming into contact with heat of harmful chemicals are called..........

                      (v)A solution which can dissolve no more solute at a given temperature is called . . . . . . . . . . .


                      SECTION B

                      3.(a) Indicate the corresponding meaning of the following warning signs.

                      Symbol

                      		 Meaning

                      image

                      		 (i)

                      image

                      		 (ii)

                      image

                      		 (iii)

                      image

                      		 (iv)

                      (b) Give four importance of First Aid.


                      4.Draw and give one function of the following apparatus:

                      Apparatus

                      		 Drawing Function

                      (i) Measuring cylinder

                      (ii) Conical flask


                      (b) By excluding a Bunsen burner, mention other three sources of heat that can be used in the laboratory.


                      (c) Why is a Bunsen burner the best heat source in the laboratory? Give three (3) reasons.


                      5. Define the following terms:

                      (i) Brownian motion

                      (ii) Compound

                      (b) Identify whether the following is a physical or chemical change: 

                      (i) Cutting aluminium foil into pieces 

                      (ii) Lighting a match .

                      (c) How can you separate the following mixtures? Briefly explain.

                      (i)Water and kerosene

                      (ii)Salt and water

                      (iii)Ethanol and water


                      6.(a) During preparation of Hydrogen gas by the reaction between dilute Hydrochloric acid and Zinc granules, the granules slowly dissolve in acid to form solution X. 

                      (i) Name solution X .........

                      (ii) Write the chemical formula of X . . . . . . 

                      (b) How can hydrogen gas be tested?image

                      (c) Mention four (4) chemical properties of hydrogen gas.

                      (d) List three (3) uses of Hydrogen gas.


                      7. (a) (i) How many electrons and protons are present in oxygen element and aluminium element?

                      (ii) Write the electronic configuration of chlorine ion.

                      (b) Use the elements with chemical symbols: P, S and Cl to answer the following questions:

                      (i)Which elements is the most electronegative?

                      (ii)Mention the least electronegative element.

                      (iii)Which element has the largest atomic structure?

                      (c)Study the following table with elements lettered F, G, L, M and J, then answer the questions that follow:

                      Element Atomic Mass Atomic Number
                      F 16 8
                      G 19 9
                      L 23 11
                      M 12 6
                      J 20 10

                      (i)How many neutrons are present in element L?

                      (ii)Which group and period of the periodic table does element F belong?

                      (iii)Which element does not readily form compounds? Give a reason.


                      8.(a) Write four (4) sources of energy used for cooking in most Tanzanian societies.

                      (b) List four (4) characteristics of a good fuel.

                      (c) List two areas where scientific procedure can be applied.


                      9.Outline six common apparatus used in the laboratory preparation of oxygen gas using hydrogen peroxide.

                      (b) Outline four uses of oxygen in everyday life situation.


                      10.(a) Define the following terms:

                      (i)Valency

                      (ii)Oxidation state

                      (iii) Anion

                      (iv)Cation

                      (b) Calculate the oxidation state of the underlined elements in the following radicals:

                      (i) NH4+

                      (ii) SO42+

                      (iii) CLO3-

                      (c) A compound consists of 40% carbon, 6.67% hydrogen and 53.33% oxygen. If its relative molecular mass is 60, calculate the following:

                      (i)Empirical formula

                      (ii)Molecular formula


                      Share To Friend(s) | Try To Do This  |  
                      FORM TWO CHEMISTRY MULTIPLE CHOICE 2017

                      (i)      Which statement gives a clear meaning of Chemistry?

                      1. The study of matter in relation of energy
                      2. The study of nature and properties of matter
                      3.  The study of matter and arrangement of particles 
                      4. The study of matter and chemical reaction

                      (ii)   The mass number of an atom is determined by:

                      1.  protons and neutrons 
                      2.  protons and electrons 
                      3.  neutrons and electrons 
                      4. protons alone

                      (iii)Which of the following is a metal?

                      1. Water 
                      2. Chlorine
                      3. Sodium  
                      4.  Nitrogen

                      (iv)Air entering the Bunsen burner barrel can be controlled by

                      1.  metal ring 
                      2.  air hole
                      3.  metal jet 
                      4. air ring

                      (v)    How many atoms are there in a water molecule

                      1. Two     
                      2. . Three 
                      3.  Four      
                      4. Five

                      (vi)Which neutral atom has the same number of eletrons as Mg2+?

                      1. Magnesium 
                      2.  Sodium 
                      3.  Neon 
                      4.  Argon

                      (vii)         The appropriate extinguisher used to put off fire caused by cooking oil is:

                      (vii)         The appropriate extinguisher used to put off fire caused by cooking oil is:

                      1. Water extinguisher
                      2. Carbon extinguisher
                      3.  Wet chemical extinguisher
                      4. Dry air extinguisher

                      (viii)      A non-luminous flame is obtained if the hole is:

                      1. fully opened 
                      2. partially opened 
                      3.  closed 
                      4.  half opened

                      (ix)Which is the least abundant gas in the air?

                      1. Nitrogen     
                      2.  Oxygen
                      3.  Neon     
                      4.  Carbon dioxide

                      (x)    The process which produces energy in form of heat and light is called:

                      1. decomposition 
                      2. combustion
                      3.  distillation 
                      4.  sublimation

                      Share To Friend(s) | Try To Do This  |  
                      FORM TWO CHEMISTRY MULTIPLE CHOICE 2016

                      THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

                      CHEMISRY FTNA 2016

                      (i) Chemistry is defined as:
                      1. The scientific study of matter, compounds and chemical reactions
                      2. The scientific study of compounds, mixtures and organic substances
                      3. The scientific study of composition, structure and properties of matter
                      4. The study of relation between human being, medicine and pollution.

                      (ii) A non-luminous flame is the most applicable flame for heating purposes because:

                      1. It is very noisy
                      2. It has no soot
                      3. It is very hot
                      4. It has no colour

                      (iii) Matter is defined as anything that has:

                      1. Volume and occupies space
                      2. Mass and occupies space
                      3. Mass and occupies density 
                      4. Density and space

                      (iv) Which of the following process is used in preventing rust of an iron?

                      1. Water
                      2. Boiling
                      3. Salting
                      4. Galvanization

                      (v) Water is a universal solvent because:

                      1. It is available everywhere
                      2. It boils at 1000C
                      3. It dissolves most of the solutes
                      4. It dissolves all crystals in compounds

                      (vi)  Carbon has two main isotopes, 12 C and 14 C with relative abundance of 98.89% and 1.11% respectively. Calculate the relative atomic mass of carbon.

                      1. 13.5
                      2. 12.01
                      3. 6
                      4. 27

                      (vii) Class F fire can best be extinguished by using

                      1. Carbon dioxide
                      2. Wet chemical
                      3. Water
                      4.  Sand

                      (viii)Which of the following components can be separated by filtration method?

                      1. Sand and water 
                      2. Kerosene and water
                      3. Ethanol and water 
                      4. NaCl and water

                      (ix) Which of the following is the colour change when cobalt chloride paper is used to test the presence of water?

                      1. White when dry and pink when wet
                      2. Blue when dry and pink when wet
                      3. Yellow when dry and pink when wet
                      4. Pink when dry and blue when wet

                      (x) All domestic utensils made of iron undergo rusting when exposed to

                      1. Air and fire
                      2. Air and oil
                      3. Air and water
                      4. Water and oil

                      2. Match each item in List A with a correct response in List B by writing its letter bellow the number of the corresponding item in the table provided.

                      LIST A

                      LIST B
                      1. Atoms of the same element that contain different numbers of neutrons.
                      2. Elements with both metallic and non-metallic characteristics.
                      3. Sub atomic particle not found in the nucleus of the atom.
                      4. The number of protons found in the nucleus of the atom.
                      5. The total number of protons and neutrons in the nucleus of the atom.
                      6. The number of unpaired electrons on an atom.
                      7. Elements which are very stable and rarely react.
                      8. Elements which form diatomic molecules.
                      9. Sub atomic particle with no charge.
                      10. A group of atoms with unpaired electrons

                      A. Atomic number

                      B. Electron

                      C. Radical

                      D. Metalloids Isotopes

                      E. Mass number

                      F. Neutron

                      G. Allotropes

                      H. Noble gases

                      I. Period

                      J. Group

                      K. Proton

                      L. Valence Atomic radii

                      M. Halogens

                       

                       

                       

                      SECTION C

                      3.   Write the name and chemical formula of two important chemical substances used in the laboratory preparation of oxygen gas. (b) Mention four physical properties of oxygen gas.


                      4.    Write four sources of energy used for cooking in Tanzania (b) What are the four characteristics of a good fuel?


                      5.   What are the five steps used in lighting a Bunsen burner?


                      (b)     Classify fuels based on their physical state and for each class give two examples.


                      6.     Explain three factors which affect the problem being investigated (b) Explain two areas where scientific procedure is applied.


                      7.     (a) Differentiate metals from non metals


                       Classify each of the following elements into their respective groups and periods.

                      (i)Berylium

                      (ii)Magnesium .. .................................

                      (iii)Neon

                      (iv)Potassium „............. ................... ....

                      (v)Chlorine


                      8.   Explain each of the following terms:

                      (i)Burn

                      (ii)  Bruises

                      (iii)Fainting ..............................................


                      (b)     What are the six procedures which can be used to help a person with severe bleeding on the wound?


                      9.   The following figure shows a set-up used to prepare gas

                      Water


                      (a)  Identify gas Q

                      (b)Identify other two chemical substances that could be used in the laboratory to prepare gas Q if zinc is not present.

                      (c) State two physical properties of gas Q.

                      (d) State two chemical properties of gas Q.


                      10.. (a) The diagram below shows the bonding between two elements A and B.

                      (i)Write the valence of B.

                      (ii)Identify the valence of A.

                      (iii)State the type of bonding formed between A and B.

                      (iv)Write the formula of the compound formed by A and B.

                       (b) Write the formula of the compound formed by the combination of:

                      (i) NH4+ and SO 2-

                      (ii) Na+ and C032-

                      (c)State the number of atoms of each element in CaCl2.

                      (d)Calculate the oxidation state of sulphur in SO 2-.


Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2015

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

CHEMISRY FTNA 2015

(i) Which of the following is the most correct statement about hypothesis?

  1. A fundamental concept or theory
  2. A possible explanation to the problem.
  3. An important statement of a research conclusion 
  4. A stage in data interpretation.

(ii) Which of the following is not among the gases composing air?

  1. Noble gases
  2. Carbon dioxide
  3. Nitrogen
  4. Hydrogen

(iii) When an atom loses or gains electron, it becomes:

  1. An ion 
  2. An anion
  3. A cation 
  4. A charged ion

(iv) A change from gaseous state to solid state without passing through a liquid state is called:

  1. Deposition 
  2. Sublimation
  3. Condensation 
  4. Solidification

(v) What is the type of a fire associated with electrical equipment?

  1. Class E 
  2. Class C
  3. Class F 
  4. Class B

(vi) Which among the following are the two processes involved during distillation?

  1. Evaporation and sublimation 
  2. Evaporation and crystallization
  3. Evaporation and condensation 
  4. Evaporation and decantation

(vii) Which of the following set of nuclide notation represents isotopes? 

  1. 18 X 16 X 19 x 
  2. 18 X 18 X X 
  3.  16 x 18 x 1890x 
  4.  16 X 1789x,

(viii) The chemical used to test the presence of water in a substance is:

     A. Cobalt Il oxide                        B. Cobalt 111 oxide

    C.Cobalt chloride  D. Copper Il chloride


 (ix) When a burning fuel produces blue colour it means there is:

   A.adequate supply of oxygen with production of soot

   B.inadequate supply of oxygen with production of more heat.

 C. inadequate supply of oxygen with production of soot.

   D.adequate supply of oxygen with production of more heat.


(x) Which of the following is the best apparatus for measuring accurately a fixed volume of a given solution?

 A. Measuring cylinder          B. Beaker

   C. Pipette                            D. Burette


2. Match each item in List A with a correct response in List B by writing its letter bellow the number of the corresponding item in the table provided.

LIST A

LIST B
  1. Group of elements which react quickly with water to form alkaline solution.
  2. The ability of an atom to attract an electron.
  3. Group of elements in which their shells are completely filled up.
  4. A vertical column of elements in the periodic table.
  5. Group element which react slowly with water to form alkaline solution.
  6. Group of elements which react with metals to form salts.
  7. Group of elements which react by receiving electrons.
  8. The systematic arrangement of elements according to their increase in atomic numbers.
  9. Group of elements with high densities and melting points, and often act as catalysts.
  10. Group of elements which have both metallic and non-metallic characteristics.

A. Metalloids

B. Non-metals

C. Periodicity

D. T r a n s i t i o n

elements

E. Electronegativity

F. Alkali metals

G. Halogens

H. Periodic law

I. Alkali earth metals

J. Rare non metals

K. Period

L. Noble gases

M. Periodic table

N. Group

 

 

 

 

SECTION C

3.(a) Define the following terms:

(i)Oxidation state

(ii)An element .......„

(iii)A compound

(iv)Fainting


(b)Write the chemical formula for each of the following compounds:

(i)Sodium sulphate

(ii)Sodium chloride ..

(iii)Calcium nitrate ......... (iv) Calcium oxide .


4.Gas X can be prepared in the laboratory by the decomposition of hydrogen peroxide.

(a)Identify gas X ..

(b)State three physical properties of Gas X

Mention three chemical properties of gas X. (d) State three uses of gas X.


5.Write the name of each of the following compounds:

(i)(NH4)2C03

(ii)CaCl2

(iii) NaSO4

(iv) KC103


(b)Give three differences between the following:

(i)   Electrovalent compounds and covalent compounds. (ii) Solutions and suspensions.


6.State two chemical properties of water.


(b) Calculate the molar mass of each of the following compounds:

(ii) NaHC03                        (iii) Fe203


(c) State whether each of the following is a chemical or physical change:

(i) Burning of charcoal .........

(i)Rusting of iron sheets


7.(a) Study the following Periodic Table and then answer the questions that follow.

(i)Write the collective name of elements in:

 Group Il ..                             Group VIII

(ii)Name the elements which are represented by the following letters:

(iii)Write the electronic configuration of the following elements:


(b)Name two products in each of the following fields made by the application of chemistry.

(a)Medicine

(b)Food and be average industry


8.(a) Calculate the oxidation number of the underlined elements:

(ii)

(b)What is the use of each of the following apparatus? (i) Thistle funnel    (ii) Pipette .........

 (iii) Wire gauze .........          (iv) Burette .........


9.When dilute hydrochloric acid is reacted with zinc metal, gas Z is formed.

(a)Identify the name of gas Z.

(b)Mention four physical properties of gas Z. State two uses of gas Z.


10.Define the following terms:

(i)Empirical formula .........

(ii)Molecular formula .........


(b)A compound consists of 85.7% carbon and 14.3% hydrogen by mass. If its relative molecular mass is 56, calculate:

(i)Empirical formula.

(ii)Molecular formula.


Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2014

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

CHEMISTRY FTNA 2014

(i) An isotope of carbon has an atomic number 6 and a mass number of 14, this means that it has:

  1. 6 protons, 8 neutrons, 6 electrons
  2. 8 protons, 6 neutrons, 8 neutrons
  3. 6 protons, 14 neutrons, 6 electrons
  4. 14 protons, 6 neutrons, 14 electrons.

(ii) Which of the following gives the correct meaning of air?

  1. Mixture of Nitrogen, Oxygen and dust particles.
  2. Mixture of Nitrogen, Oxygen and Carbon dioxide.
  3. C. Mixture of Nitrogen, Oxygen and Water vapour
  4. Homogenous mixture of gases.

(iii) Why is water a universal solvent?

  1. It is neither acidic nor basic than any other known liquid.
  2. It dissolves more substances than any other known liquid.
  3. It occurs naturally in all the three states of matter than any other liquid.
  4. It dissolves both organic and inorganic solutes than any other liquid.

(iv) How many numbers of shells are there in Magnesium atom?

  1. 1
  2. 2
  3. 3
  4. 4

(v) Technicians prefer to use blue flame in welding because:

  1. It is bright and non-sooty
  2. It is light and non-sooty
  3. It is very hot and large
  4. It is very hot and non-sooty

(vi) Which of the following is the characteristic of solid?

  1. It is packed together but does not have definite size.
  2. It is compact packed and has definite shape and size.
  3. It is loosely packed with irregular order.
  4. It is closely packed with uniform shape.

(vii) What is the oxidation state of Chlorine in KCIO3?

  1. +2
  2. -5
  3. +5
  4. +3

(viii) Which of the following is a sequential method of separating mixture of salt and sand?

  1. Evaporation, filtration and decantation
  2. Decantation, evaporation and filtration
  3. Sedimentation, evaporation and filtration
  4. Decantation, filtration and evaporation

(ix) Which of the following is the best apparatus for measuring accurately the volume of a given solution?

  1. Measuring cylinder
  2. Burette
  3. Beaker
  4. Conical flask

(x) The factors that affect the problem being investigated are referred to as:

  1. Dependent factors
  2. Variables
  3. Independent factors
  4. Conditions

2. Match each item in List A with a correct response in List B by writing its letter bellow the number of the corresponding item in the table provided.

LIST A

LIST B

(i)       Method of recovery of both solute and solvent from a liquid.

(ii)     Method of separating two miscible liquids which their boiling points are close together.

(iii)   Method of separating two immiscible liquids.

(iv)   Method of separating two solids by heating in a way that one changes its state directly to gas.

(v)     Method of separating coloured components using a moving solvent on materials that absorb such solvent.

(vi)   A suitable method of separating edible oils from seeds.

(vii) Method of separating solid mixture which contains iron.

(viii)Method of separating an insoluble solid from a liquid.

(ix)Method of separating a soluble solid and a solvent.

(x)Method of separating liquids which forms a suspension with a solvent

  1.  

A. Layer separation

B. Chromatography

C. Simple distillation

D. Condensation

E. Hand picking

F. Fractional distillation

G. Sieving

H. Solvent extraction

I. Evaporation

J. Sublimation

K. Magnetisation

L. Magnetism

M. Deposition

N. Decantation

O. Filtration

 

 

 

 

3.(a) Define the following terms:

(i)       Emulsions

(ii)     A solution

(iii)   Atom

(iv)    Radical


(b)      Write the chemical formula for each of the following compounds:

(i)Sodium sulphide

(ii)Beryllium chloride

(iii)Copper (I) oxide

(iv)Potassium oxide


4.Draw a diagram to show laboratory preparation of oxygen using hydrogen peroxide. In the diagram, label all the compounds and elements involved in the preparation.

 Briefly explain how you would distinguish ordinary air from pure oxygen.

(c) List two chemical properties of oxygen gas.


5.Write the name of each of the following compounds:

(i) Cuo (ii) PC13 (iii) N204


(b)      Give three differences between the following:

(i)Physical changes and chemical changes

(ii)Mixture and compounds


6.Give four physical properties of water


 Calculate the molar mass of each of the following compounds: (i) Na3P04

(iii) caC03


7.(a) Study the following periodic table and then answer the questions that follow:

(i) Name elements named by the following letters: S, W, X, Z

(ii) Write the electronic configuration for the elements represented by the following letter.


(b) Name two products in each of the following fields made by the application of chemistry.

Field

       Products

(i) Home care and cosmetics

(ii) Transport


8.

(b)      What is the use of each of the following apparatuses?

(i)Tongs .      (ii) Spatula.........

(iii) Pipette.........     (iv) Crucible .........


9.(a) Study the experiment diagram below and answer the questions that follow.

(i)What happens to the copper (Il) oxide during the experiment?

(ii)What happens to the two pieces of cobalt paper? (iii) Write a word equation for the reaction.

(b)      Mention four chemical properties of hydrogen gas.


10.(a) Define the following terms:

(i)Covalent bond

(ii)Electrovalent bond

(b)      A compound consists of 82.8% carbon and 17.2% hydrogen by mass. The vapour density of the compound is 29. Calculate:

(i)Empirical formula.

(ii)Molecular formula.


Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2013

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

CHEMISTRY FTNA 2013

SECTION B

 (i) The apparatus used for grinding granular chemicals in the laboratory include:

  1. Crucible and watch glass
  2. Mortar and pestle
  3. Pestle and pair of tongs 
  4. Spatula and basin

 (ii)  The substances that can be used to extinguish fire are:

  1. Carbon dioxide and sand
  2. Carbon dioxide and sugar
  3. Nitrogen and sand
  4. Nitrogen and water

 (iii) Which of the following electronic configurations are of metals?

A. 2:8:1 and 2:5

B. 2:8:2 and 2:6

C. 2:8:3 and 2:8:8:7

D. 2:8:6 and 2:8:8:7


 (iv) When sugar is dissolved in water, a uniform mixture is formed. The resulting mixture is called a:

  1. Solute
  2. Solution
  3. Solvent
  4. Suspension

 (v) Flammable chemicals are those which:

  1. Burn skin
  2. Catch fire easily
  3. Explode
  4. Extinguish fire

 (vi) Which of the following can be classified as a renewable source of energy?

  1. Biomass
  2. Coal
  3. Coke
  4. Petroleum

 (vii) The part of Bunsen burner that controls the amount of air coming in is called:

  1. Air hole
  2.  Barrel
  3.  Collar 
  4.  Jet

 (ix) The simplest formula of a compound formed when combining 13g of aluminum and 17g of chlorine is:

  1. AlCl
  2. Al2Cl
  3. Al3Cl2
  4. AlCl3

 (x) The second step in the scientific procedure is:

  1. Data collection and analysis
  2. Data interpretation
  3. Experimentation and observation
  4. Hypothesis formation

2. Match each item in List A with a correct response in List B by writing its letter bellow the number of the corresponding item in the table provided.

LIST A

LIST B

(i)Ability of an atom to gain or attract electrons towards itself

(ii)Addition of oxygen to or removal of hydrogen from a substance

(iii)A substance which behaves in three states of matter

(iv)Bond formed between two atoms due to sharing of two electrons from each other.

(v)Combining power of an element

(vi)Liquids which form layers when mixed

(vii)Reddish brown coating on metals

(viii)Supports burning of substances

(ix) The number of electrons in the outermost shell

(x) Treatment and purification of water for human uses.

A. Chlorination

B. Covalent

C. Electronegativity

D. Electropositivity

E. Evaporation

F. Groups

G. Ionic

H. Kerosene and water

I. Oxidation

J. Oxygen

K. Reduction

L. Rust

M. Sugar and alcohol

N. Valency

O. Water

3. (a) What do you understand by the following terms?

(i) Emperical Formula

(ii) Relative atomic mass


(b)      A certain compound K contains 15.8% carbon and 84.2% sulphur. The molar mass of K is 76g/mol. Determine its:

(i)       simplest formula ... ......

(ii)     molecular formula .........


4.(a) Define the following terms as applied in Chemistry:

(i)Flame

(ii)Bunsen burner

(iii)Laboratory


(b)      List four properties of each of the following:

(i)       A luminous flame

(ii)     A non-luminous flame


 Write the chemical formula for each of the following compounds:

(i)Sodium carbonate

(ii)Calcium nitrate

(iii)Ammonium chloride


5. Calculate the percentage by composition of the underlined elements in the following compounds: (i) Na2S04


(b)      Give the use of each of the following components which are found in the First Aid kit:

(i)       Plaster .........

(ii)     A pair of scissors (iii) Cotton wool ......... (iv) Gloves .........


 Categorize the following changes as either chemical or physical:

(i)Freezing of juice in a bottle .........

(ii)Rusting of iron .........

(iii)Burning of wood .

(iv)Drying of wet clothes .........


6.(a) Define the following terms:

(i)Chemistry

(ii)Element

(iii)Catalyst


(b)      Give three differences between the following:

(i)       Compound and mixture

(ii)     Suspension and solution


7.(a) The figure below shows the relationship among three states of matter. Name the processes involved in A, B, C and D.


(b)      State the valency of each ofthe following atoms:

(i)       Aluminium             (ii) Neon

               (iii) Sulphur                             (iv) Potassium


(c)       Give the chemical formula for the combination of the following sets of ions:

(i)       Mg2+, PO}(ii) Fe3+, soi-


8.(a) Write a word equation for each of the following reactions:

(i)Calcium burns in Oxygen .........

(ii)Sodium reacts with water ... ... ...

(b)      What do you understand by the following terms?

(i)       Water treatment

(ii)     Water purification

(c)       Mention six uses of water in economic activities.


9.Gas "L" has the following properties: it is highly flammable, readily combines with other elements, readily reacts with other chemical substances and is a strong reducing agent.

Name the gas L

(b)      What is the method used to collect gas in the laboratory? Give a reason.

Give four uses of gas L


10.Mention four chemical properties of Oxygen.

(b)      Find the oxidation number of each of the underlined elements in the following: (i) KC103

(ii)

Use the IUPAC system to name each of the following chemical compounds:

    (i) Cuo                                 (ii) CaSO4

 (iii) HN03                               (iv) ZnC12


Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2012

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

CHEMISTRY FTNA 2012

(i)All domestic utensils made of iron undergo rusting when exposed to:

  1.  Air and fire
  2.  Air and oil
  3. Air and water 
  4. Water and oil

(ii)When a small amount of common salt is dissolved in a glass of water the mixture formed is:

  1. Heterogeneous 
  2. Homogeneous 
  3. Immiscible 
  4. Suspension

(iii) A chemist should acquire all of the following skills except:

  1. Experimentatio
  2. Observation 
  3. Problem identification 
  4. Surgery

(vi) An important property of oxygen which distinguishes it from other gases is that it:

  1. Burns and supports combustion
  2. Burns but does not support combustion 
  3. Neither burns nor supports combustion
  4. Supports combustion but does not burn

(v) The process of chlorination in water treatment aims at:

  1. Forming suspension 
  2. Killing micro-organisms 
  3. Making syrup 
  4. Removing bad odour

(vi) One of the following is not correct about coke being a better fuel than coal as it:

  1. Does not produce carbon dioxide gas
  2. Does not produce poisonous gas
  3. Has a higher heat content 
  4. Is clean and smokeless

(vii) Class E fire can best be extinguished by using:

  1. Carbon dioxide 
  2. Fire blanket
  3. Sand 
  4. Water

(viii)The following is a set of apparatuses which are used for heating:

A.crucible, test tube, evaporating dish

B.evaporating dish, tongs, crucible

C.test tube, evaporating dish, tongs

D.tongs, crucible, test tube


(ix)Which of the following methods can be used to get oil from cotton seeds?

A.Decantation  

B. Distillation

C. Grinding and distillation 

D. Grinding followed by squeezing


(x)Which of the following apparatuses is suitable for measuring volumes of smaller quantities of liquids?

A.Beaker    

B. Burette

C. Conical flask 

D. Measuring cylinder


2. Match each item in List A with a correct response in List B by writing its letter bellow the number of the corresponding item in the table provided.

LIST A

LIST B

(i)A method used to separate mixtures of two or more liquids that form homogeneous solution by means of fractional column.

(ii)A substance that absorbs moisture from the atmosphere and dissolves in it.

(iii)Elements with stable structure.

(iv)Molecular mass of calcium carbonate.

(v)Poisonous gases prepared in it.

(vi)Produces a "pop" sound.

(vii)Quiet and unsteady flame.

(viii)Smokeless solid fuel.

(ix)Source of energy derived from animal waste,

(x)Used to prevent direct heat to reach the apparatus.

A. Biogas

B. Chromatograph

C. Coke

D. Corrosive

E. Deliquescent

F. Fractional distillation

G. Fume chamber

H. Hydrogen

I. Luminous flame

J. Noble gases

K. Non-luminous flame

L. Oxygen

M. Wire gauze 

N. 80g/mol 

O. 100g/mol.

SECTION C

3.         (a) Mariam was preparing food for her family using hot oil in a frying pan. Accidentally the pan tripped over and a huge fire spread over her kitchen floor.

(i)Mention two extinguishers which would be appropriate for putting out the fire.

(ii)Which fire extinguisher would be dangerous to use when trying to put out the fire in (a) above? Give reason. (b) Mention three conditions for a fire to start.

(c) (i) What is combustion?

(ii) Give three areas where combustion is applied.


4.         (a) In an experiment, two iron nails A and B were used whereby painting was applied on nail A. The two nails were placed in a moist environment and after one month the weight of each nail was determined. Which of the two nails would be heavier? Give reason.


(b)State the method which will be used to protect each of the following from rusting:

(i)Covering iron sheets with a layer of most reactive metals (ii) Bicycle chain

(c)  Find the oxidation number of the underlined elements in the following:

(i)Mn04

(i) K2C%07


5. Use the details given below about elements P, Q, R, S and T to answer questions (a) and (b).

Element
Atomic number
Atomic Mass
P
10
20
Q
11
23
R
12
24
S
13
26
T
14
32

(a) (i) Write down the electronic configuration of the elements represented by letters from P to T:

(i)How many neutrons are present in element Q? .

(c)Name the type ofbonds that will be formed in the combination between the following elements: (i) Q and T

(ii) S and T

(d)Write the chemical symbol for each of the following elements:

(i)Silver 

(ii)Lead .........

(iii)Manganese ......


6.         (a) Explain why petroleum and coal are non-renewable resources of energy. (b) What is fuel?

 The problem facing Tanzania society is misuse of charcoal and firewood as a source of fuel. Give two points of advice to the society on how to use less charcoal and firewood efficiently.

(d) Mention three categories of fuel and give two examples in each category.


(a) List down four careers that are a result of studying Chemistry.

 The following are possible causes of accidents which can occur in the Chemistry laboratory. State how you can avoid them.

(i)Poisonous chemicals left in an unlocked cupboard .........

(ii)A student picking up a bottle containing concentrated H2S04 acid by the neck .........

(iii)Concentrated acids stored in the upper most shelf of cupboard


8.An experiment showed that 13.88g of calcium chloride were obtained from the combination of 5g of calcium with unknown relative mass of chlorine.

(i)What is the simplest formula of calcium chloride .

(ii)What kind of bond exists between calcium and chlorine?

(iii)Give two properties of the bond you have mentioned in (ii) above.

(b)      Define the following terms as applied in Chemistry

Decantation

Filtration

(iii)Picking

(iv)Funnel Separation

(c) (i)Which is the most abundant element on the earths outer crust? (ii) The term used for acidic chemicals which can burn your skin is

(iii) Give the name of a flame which forms soot .........


9.(a) Explain why:

(i)a magnesium ion has a charge of 2+ .........

(ii)a magnesium oxide has no overall charge ..

(b) Give the name of a bond which can be formed between two oxygen atoms .......

(c) (i) State the modern periodic law

(ii)Give the special name for each of the following groups of elements in the periodic table:

Group I

Group Vll .........

(iii)Why is the atomic number a better way of identifying an element than the mass number? .


10.(a) Mention four physical properties of water.

(b)      What will happen when:

(i)       a burning splint of wood is introduced into a gas jar containing oxygen gas

(ii)     oxygen gas reacts with metals .

(iii)   hydrogen gas reacts with oxygen gas .........

(c)      List four uses of hydrogen in our daily life.


Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2011

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

CHEMISTRY FTNA 2011

(i) Isotopes are atoms of the same element that have different:

  1.  Atomic number  
  2.  Electron arrangement
  3. Mass number    
  4. Protons

   (ii) When substance A and substance B react to produce a new substance C, the reactants A and B are said to:

  1. Be miscible    
  2. Form a mixture
  3. Form a solution C
  4. Undergo chemical change

    (iii) In the formula of the compound F2K3 the valences of F and K are respectively:

  1. 2 and 3     
  2. 3 and 2
  3. 4 and 6         
  4. 6 and 4

    (iv)  The process by which water is converted into water vapour or steam is called:

  1. Condensation
  2. Evaporation
  3. Precipitation
  4. Transpiration

     (v) In the Bunsen burner a sooty flame is most likely to be formed when the:

  1. Air holes are fully closed 
  2. Air holes are opened
  3. Flame is noisy
  4. Flame is smaller and hotter

    (vi)  The best way to separate a mixture of iodine and iron fillings is by:

  1. Decantation
  2. Evaporation to dryness 
  3. Ractional distillation
  4. Sublimation

     (vii) The choice of the source of heat depends on the:

  1. Colour of the flame
  2. Quantity of heat produced
  3. Substance to be burned or boiled
  4. Type and shape of flame

    (viii) When oxygen combines with metals they:

  1. Form metallic oxides 
  2. Form precipitates 
  3. Rust
  4. Sublime

    (ix)  The pair elements which is most likely to form a covalent bond when  they react together is:

  1. Carbon and oxygen
  2. Magnesium and potassium
  3. Nitrogen and aluminium
  4. Sodium and oxygen

    (x) A calcium ion (Ca2+) differs from calcium atom (Ca) because a calcium ion has:

  1. Less electrons
  2. Less protons
  3. More electrons
  4. More neutrons

2. Match each item in List A with a correct response in List B by writing its letter bellow the number of the corresponding item in the table provided.

LIST A

LIST B

(i) Burning gases that give out heat and light

(ii) Coating iron objects using zinc metal

(iii) Domestic water treatment and purification

(iv) Heterogeneous mixture

(v) Holds maximum of 8 electrons

(vi) Intelligent guess on the cause of the problem

(vii) Liquid metal

(viii) Relights a glowing splint

(ix) The burning material is a liquefied gas

(x) Turns white anhydrous copper (Il) sulphate blue

A. Boiling and filtration

B. Class C fire

C. Distillation

D. Energy shell 1

E. Energy shell 2

F. Experimentation

G. Flame

H. Galvanization

I. Hydrogen

J. Hypothesis

K. Mercury

 L. Oxygen

M. Solution https://myfiles.space/user_files/47611_287b70cf0bb81f9b/1585426706_chem-scheme-11_files/image019.jpg

N. Suspension

O. Water

SECTION C

3.    (a) Why do atoms combine?

(b)A metal Z atomic number 12 combines with chlorine to produce a metal chloride. By means of diagrams illustrate the arrangement of electrons in Z before and after the reaction.

(c)An atom X of atomic number 14 combines with chlorine to form a chloride. What type of bond will be formed between the atoms?


4. (a)  What do you understand by the term "valency"?

(b) Calculate the oxidation number of the underlined elements: (i) NaOH

(i) CO3

(iii) Na3P04

(v) S02

(c) Explain three points on the importance of changing one state of matter to another.


5.          Give two reasons why water is a compound.

(b) Write IUPAC names for each of the following compounds: (i) cac03

(ii) Al2(SO4)3

(iii) NaHC03

(iv) Mg(NO)2

(v) KCI

Describe a chemical test for water.


6.          State the law of conservation of energy.

(b)      Give two ways in which energy can be transformed from one form to another.

(c)       List down two sources of heat in the laboratory.


7.(a) Define the term "empirical formula".

(b) An organic compound contains 26.7% carbon, 2.2% hydrogen and

71.1% oxygen. If its relative molecular mass is 90, determine its:

(i)Empirical formula

(ii)Molecular formula


(a) State three points of modern atomic theory that amend Daltons ideas.

8.(a) Differentiate between:

(i)an atom and an element

(ii)Combustion and rusting

(iii)a solute and a solvent

(iv)a compound and a mixture

(b)Give two applications of chemistry in everyday life

(c)Why most laboratory apparati are made of glass?


Below is part of the periodic table and the numbers represent atomic numbers. Study the table carefully then answer the questions that follow:

(i) Write T in the space where a noble gas in period 3 would occupy. 

(ii) Write U in the space where the most active metal would occupy.

(iii) Write W in the space where the most active non-metal would occupy.

(iv) Write X in the space which would be occupied by an element in period 3 capable of forming a compound XW

(v) Write Y in group Il period 4 element.

(vi) Write Z in group VI period 3 element.

(b)     Write the chemical symbols of the following elements:

(i)       Argon

(ii) Sulphur

(iii)Boron

(iv)Silicon

(v)Phosphorus

(c)      Write the formula of each compound formed between:

(i)       Aluminium and chlorine

(ii)     Potassium and oxygen


(a) (i) Name two reagents normally used for preparation of hydrogen in the laboratory.

(ii) Write a word equation for the reaction in (i) above.

(b)      (i) Why is hydrogen gas used for filling balloons? (ii) Describe chemical test for hydrogen gas.

(c)      Explain safety measures that should be taken when handling chemicals with the following warnings: (i) Flammable

(ii)Corrosive

(iii)Irritant or Harmful

(iv)Toxic


Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2010

In scientific study, the tentative explanation for the observed chemical phenomenon can be proved by:

  1. Data analysis
  2. Experimentation
  3. Hypothesis
  4. Observation

A certain liquid dissolves copper (Il) sulphate to form a blue solution. This liquid is likely to be:

  1. Hydrochloric acid
  2. Liquid oxygen
  3. Nitric acid
  4. Water

When a chemist studies a substance he/she is interested in its:

  1. Force of attraction
  2. Properties
  3. Shape
  4. Smell

The boiling point of pure water at sea level is 1000C and that of ethanol is 780C. The mixture of ethanol and water can be separated by:

  1. Filtration process
  2. Fractional distillation process
  3. Layer separation process
  4. Sublimation process

Which group among the following elements are metals?

  1. Calcium, magnesium and sodium
  2. Calcium, hydrogen and nitrogen
  3. Calcium, carbon and magnesium
  4. Oxygen, potassium and sodium

An electrovalent bond is formed by:

  1. Arrangement of electrons
  2. Sharing of electrons
  3. Transfer of electrons
  4. Vibrations of electrons

Petrol is an example of:

  1. corrosive substance
  2. flammable substance
  3. irritating substance
  4. toxic substance

The electronic configuration of silicon is:

  1. 2:7:3
  2. 2:8:2
  3. 2:8:3
  4. 2:8:4

The most abundant element on the earth is:

  1. carbon
  2. iron
  3. nitrogen
  4. oxygen

Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2009

The fixed volume (20cm3) of distilled water in the laboratory can be measured by using:

  1. Beaker    
  2. Burette
  3. Pipette      
  4. Small measuring cylinder

 Domestic utensils made of iron undergo rusting when exposed to:

  1.  Air and fire 
  2.  Air and oil
  3.  Air and water  
  4.  Air and soil

  The source of energy which when used can be made to be put into use again is known as:

  1. Fuel   
  2. Non-renewable energy
  3. Renewable energy 
  4. Solar energy

A student who gets burnt accidentally in the Chemistry Laboratory would be given one of the following as first aid:

  1. Antibiotic solution  
  2. Nitric acid
  3. Petroleum jelly     
  4. Potassium permanganate

The chloride ion (Cl-) differs from chlorine atom because chloride ion has:

  1. Less electrons
  2. Less protons
  3. More electrons 
  4. More protons

 The percentage by mass of nitrogen in (NH4)2C03 is:

  1. 28.0     
  2. 29.1
  3. 37.5
  4. 96.0

The elements which are found in group VIII of the periodic table are known as:

  1. Metals
  2. Noble gases
  3. Non - metals
  4. Right elements

Isotopes are atoms which have:

  1. Different mass number
  2. Different number of electrons
  3. Different number of protons
  4. The same number of neutrons

The process used to separate a mixture of salt and water is:

  1. Evaporation
  2. Filtration
  3. Simple distillation    
  4. Sublimation

Which of the following chemical species have the same number of electrons?

  1. Cl, Be, He and O2-
  2. K+, Ca2+, Cr- and Ar
  3. Na+, Mg2+, Cl3 and Ar
  4. O2-, F-, S2- and Cl-

Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2008

      Separation of a mixture by fractional distillation is possible if the mixture constituents differ in their:

  1. Boiling points
  2. Melting points
  3. Vapourizing points 
  4.  Freezing points

      The valency of an element with atomic number 10 is:

  1. 2
  2. 3
  3. 0
  4. 1

    When element T of Group I combines with element X of Group VI, the formula of the compound formed is: 

  1. T2X
  2. X2T
  3.  TX2  
  4.  XT4

A metal atom can become an ion by electron:

  1. Attraction      
  2. Gain
  3. Loss 
  4. Sharing

How many protons, neutrons and electrons are there in an atom represented by the symbol 39 19 K?


 Protons Neutrons Electrons
A. 39 19 20
B. 19 39 20
C. 20 19 20
D. 19 20 19





Which of the following warning signs is likely to appear on the bottle containing concentrated Nitric Acid in the laboratory?

  1. Corrosive
  2. Explosive
  3. Flammable
  4. Irritant

Saturated solution is one which:

  1. Contains more solute undissolved at a given temperature.
  2. Will take no more of solute at a given temperature.
  3. Contains a little solute at a given temperature.
  4. Has a large amount of solvent at given temperature.

The percentage of C in C2H6 is:

  1. 20
  2. 40
  3. 60
  4. 80

     Which of the following electronic configurations are of metals?

  1. 2:8:8:1 and 2:8:8:7
  2. 2:8:3 and 2:8
  3. 2:8:8:1 and 2:8:3
  4. 2:8:6 and 2:8:8:7

       Hard water which can be softened by boiling method contains dissolved:

  1. Calcium Carbonate  
  2. Calcium Sulphate
  3. Magnesium Chloride        
  4. Magnesium Hydrogen Carbonate

Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2007

      When a chemist studies a substance, he/she is interested in its:

  1.  Force of attraction   
  2.  Shape
  3.  Smell     
  4.  Properties

   When you melt a piece of iron, it undergoes:

  1.  Sublimation
  2.  Physical change 
  3.  Chemical change
  4.  Combination

One isotope of an element has atomic number A and mass number M. How many neutrons are contained in the nucleus of its atom?

  1. M
  2. A
  3. A - M
  4. M - A

The total number of protons and neutrons in the nucleus of an atom is called:

  1. Valency number  
  2.  Atomic number
  3.  Molecule number    
  4.  Mass number

    Hydrogen gas can be collected by downward delivery because:

  1.  It burns in air with a pop-sound
  2.  It is more soluble than air
  3.  It is lighter than air
  4. It can fill balloons

The reaction that takes place when limestone (CaCO3) is heated in the laboratory can be described as:  

  1.  Combination   
  2.  Decomposition
  3.  Replacement  
  4.  Double decomposition

Which of the following warning signs is likely to be found on a bottle containing petrol?

  1. Oxidant
  2. Flammable
  3. Corrosive
  4. Irritant

The process of chlorination in water treatment aims at:

  1.  Killing micro-organisms
  2.   Removing bad odours
  3.  Forming suspension
  4.  Syrup making

  Oxidation may be defined as:

  1. Loss of hydrogen by a substance
  2. Gain of hydrogen by a substance
  3. Reaction in which oxygen is lost
  4. Reaction in which electrons are increased

     Which of the following sets of symbols represents isotopes:

  1. 167W      168W       169W
  2. 168X       178X         188X
  3. 168X        178X       189X
  4. 167Y        178Y          189Y

Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2006

(i) One of the following apparatuses is used to measure a fixed volume of liquids: 

  1. Pipette
  2. Burette 
  3. Measuring Cylinder 
  4. Beaker 

Coloured substances can be separated through the process called:

  1. Filtration
  2. Chromatography
  3.   Distillation
  4. Sublimation 

Which of the following equations is a neutralization reaction?

  1. Zn + C12   znC12
  2. Fe+S  Fes
  3. H+ + OH-  H 20
  4. CaC03  CaO + C02

     Moving across a period in the periodic table,

  1. Electro negativity decreases
  2. Electro negativity increases
  3. Metallic property increases
  4. Electro positivity increases 

      A solution of pH 1.5 is best described as:

  1. Weak acid
  2. Strong base
  3. Weak base
  4. Strong acid 

  A Sample of chlorine gas was found to contain 75% of the isotope 35C117 and 25% of isotope 35C117. Which of the expressions below is used to calculate the Relative Atomic mass of chlorine?

A.      (35 x 75)+(37 x 25)

                     100

B.    (35 x 25) x (37x75)

                100

C.     (75 x 25) +(37x35)

                100

D.     35 + 37

              2


   Which of the following group of substances represents flammable liquids?

  1. Petrol, pesticides, hydrogen;
  2. Petrol, sulphuric acid, methylated spirit;
  3. Methylated spirit, petrol, kerosene;
  4. Kerosene, diesel, hot water. 

If element M of Group I element combines with element X of Group VI, the formula of the compound is:

  1. X2M6
  2. MX2
  3. MN6
  4. M2X

     Acid changes colour of litmus paper from:

  1. Blue to yellow
  2. Red to blue
  3. Red to pink
  4. Blue to red

The untreated and treated water differ in that:

  1. Untreated water contains dirt while the treated contains dissolved chemicals.
  2. Treated water forms lather with soap while the untreated forms scum.
  3. Untreated water is safe for swimming while the treated can corrode the skin.
  4. Treated water is safe for swimming while the untreated can be harmful to the health.

Share To Friend(s) | Try To Do This  |  
FORM TWO CHEMISTRY MULTIPLE CHOICE 2005

      The states of matter are:

  1. Element, gas and mixture
  2. Liquid, moisture and element
  3. Water, moisture and solid
  4. Gas, liquid and solid

    A substance which absorbs water/moisture from the atmosphere and forms a solution is called:

  1. Efflorescent 
  2. Amphoteric
  3. Hydroscopic  
  4. Hydroscopic  

The correct statement about metals is that they:

  1. React with acids to give gases;
  2. React with acids to give hydrogen gas;
  3. Have more than one valency;
  4. All have magnetism; 

  In chemistry experiments test:

  1. Data
  2. Problems
  3. Hypotheses
  4. Observation 

    In any chemical change:

  1. Energy is not created
  2. Energy is either absorbed or given out
  3.     Energy is created
  4. Energy is neither liberated nor absorbed

  Which of the following sets of apparatus are suitable for measuring volume of solutions?

  1. Burette, pipette and beaker;
  2. Burette, pipette and conical flask;
  3. Measuring cylinder, burette and pipette;
  4. Burette, Flat bottomed flask and pipette; 

The substance that can burn your skin is best described as:

  1. Flammable;
  2. Corrosive;
  3. Explosive;
  4. Toxic.

Sublimation is the process whereby:

  1. Substances float in liquids when heated;
  2. A solid substance changes directly to vapour without the liquid state when heated;
  3. A mixture of solid substances is separated by heating; 
  4. An alcohol is separated from water.

Which of the following chemical species have the same number of electrons?

  1. K+, Ca2+, cr and Ar
  2. CI, Be and 02
  3. 02 , Ca2* and Mg2*
  4. Na+ , Mg2* , Be2+ and Li

      The process of chlorination in water treatment aims at:

  1. Killing micro organisms
  2. Syrup making
  3. Forming suspension
  4. Removing bad odours

Share To Friend(s) | Try To Do This  |  

For Call,Sms&WhatsApp: 255769929722 / 255754805256

   Click Here To Access You Scheme(ONLY IF YOU A HAVE CODE)
GO TO NECTA EXAMS