PRESIDENT’S OFFICE

REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

FORM TWO EXAMINATION – SEPTEMBER 2022

032     CHEMISTRY

TIME: 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 the space provided.
3. All writing must be in black or blue ink except for diagrams which must be in pencil
4. Cellular phones and any unauthorized materials are not allowed in the examination room
5. Write your Examination Number on every page of your answer booklet(s)
6. The following constants may be used

Zn= 65, X =32, O=16

SECTION A (15 Marks)

Answer all questions in this section

1. For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number in the bracket provided.

1.        When burning a fuel produces  blue color it means there is

1. Adequate supply of oxygen with production of soot
2. In adequate supply of oxygen with production of soot
3. Adequate supply of oxygen with production of less heat
4. Adequate supply of oxygen with production of more heat ( )

2.       Which of the following is an agricultural chemical products made by the application of chemistry?

1. Drugs B. Pesticides  C. Clothes  D. Cement ( )

3.    Which of the following is NOT among the composition of air?

1. Noble gases B. Hydrogen  C. Carbon dioxide    D. Nitrogen ( ) 

4.   Which one of the following sets of laboratory apparatus are used for measuring volume of liquids

1. Conical flask, measuring cylinder and test tube
2. Burette, pipette and measuring cylinder   ( )
3. Volumetric flask, water though and burette
4. Gas jar, measuring cylinder and pipette

5.      The following are the characteristic of ionic compound

1. They are easily vaporized
2. They are easily dissolved in organic solvent
3. Conduct electricity when in solution or molten
4. Usually exist as liquid or gas at room temperature

6.   Which of the following is a symbol of silver ion

1. Ag  B. S  C. Ag+  D. Si   ( )

7.  What is proton, electron and atomic number AI    ( )

1. 13,13,13  B. 13,11,13  C. 13,12,13  D. 13,13,11

8. Which state is involved when drying wet clothes?

1. Liquid to solid B. Gas to liquid C. Liquid to gas  D. Solid to gas( )

9.    The components of fire triangle are ;

1. Oxygen, fuel and heat  C. Oxygen, heat and hydrogen ( )
2. Oxygen, nitrogen and heat D. Oxygen, carbon dioxide and fuel

10.      Which group and period does the element with 14 electrons belong?

1. Group II and period 3  C. Group III and period 3 ( )
2. Group IV and period 3  D. Group II and period 4

2. Match the descriptions in List A with the corresponding in List B by writing the letter of the correct response beside the item number in the answer booklet provided

Answers

SECTION B (70 Marks)

Answer all questions in this section

3(a) Fill the blanks 

1. The techniques used to separate serum from blood samples is called _________________________
2. The insoluble substances remain in a filter paper during filtration are termed as ___________________________
3. Boiling points of substance reflect the strength of __________________
4. The sub atomic particles of an atom are ____________________ and _____________________
5. Solar energy is example of _______________________resources

3. (b) Suggest the best method of separating the following mixture

1. Alcohol and water  _______________________________________________________________________________________________________________________________________________________________________________________
2. Sodium chloride and water _______________________________________________________________________________________________________________________________________________________________________________________
3. Green solution from leaves   _______________________________________________________________________________________________________________________________________________________________________________________
4. Sand from rice  _______________________________________________________________________________________________________________________________________________________________________________________

5. Iron fillings and powder calcium carbonate  _______________________________________________________________________________________________________________________________________________________________________________________

4. (a) Complete the following table

(b) With one example explain each of the following

1. Alkali earth metals __________________________________________________________________________________________________________________________
2. Metalloids  __________________________________________________________________________________________________________________________
3. Transition metals  __________________________________________________________________________________________________________________________
4. Why are noble gases stable? __________________________________________________________________________________________________________________________
5. Why covalent compound do not conduct electricity  __________________________________________________________________________________________________________________________

5. (a) What is destructive distillation

__________________________________________________________________________________________________________________________________________

(b) Mention five (5) procedures of preparing charcoal from the method mentioned in 

      5(a) above 

1. ________________________________________________________
2. ________________________________________________________
3. ________________________________________________________
4. ________________________________________________________
5. ________________________________________________________

  (c) Mention four (4) steps of lightning a Bunsen burner

1. ________________________________________________________
2. ________________________________________________________
3. ________________________________________________________
4. ________________________________________________________
5. ________________________________________________________

6. An atom of element X having atomic number 11 combines with an atom of element Z having atomic number 17 to form a compound
   1. Write the formula of the compound and state the type of bond formed in the compound

2. Give four properties of compound in 6(a)

1. ____________________________________
2. ____________________________________
3. ____________________________________
4. ____________________________________
5. ____________________________________

7. (a) Write the chemical symbols for beryllium, boron, neon, nitrogen and phosphorus

1. ____________________________________
2. ____________________________________
3. ____________________________________
4. ____________________________________
5. ____________________________________

(b) You are provided with a compound composed of 40.5% zinc. 19.6% sulphur and 

     39.9% oxygen. Calculate the molecular and empirical formula. If it’s molecular 

     mass is 161

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

1. During laboratory preparation of oxygen gas, little manganese dioxide is added to hydrogen peroxide.

__________________________________________________________________________________________________________________________

2. Fish can obtain oxygen for respiration although spend their life in water

_________________________________________________________________________________________________________________________ 

3. Oxygen gas can be used for welding activities although it does not burn

__________________________________________________________________________________________________________________________

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

1. Fueling __________________________________________________
2. Manufacturing of margarine _________________________________

3. Give two domestic uses of oxygen gas

1. ________________________________
2. ________________________________

9. (a) Define the following terms

1. Water treatment __________________________________________________ ________________________________________________________________
2.            Water purification  _____________________________________________ ________________________________________________________________

(b) List down four (4) economic uses of water 

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

(c) What are the importance of water treatment and purification? Give two (2) reasons 

__________________________________________________________________________________________________________________________________________

SECTION C (15 Marks)

10. Briefly explain five methods used to prevent rusting and give example for each

THE PRESIDENT’S OFFICE

MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

COMPETENCY BASED SECONDARY EXAMINATION SERIES

CHEMISTRY MID TERM EXAMINATION

FORM TWO- AUG/SEPT 2021

 Time: 2:30Hours

Instructions.

1.                          This paper consists of section A, and B with a total of 10 questions
2.                          Answer all questions in spaces provided.
3.                          Section A carries 20 marks, section B 80 marks.
4.                          All answers should be written in the spaces provided.
5.                          All communication devices, calculators and any unauthorized material are not allowed in examination room.
6.                          Write your number on every page of your answer booklet.
7.                          The following atomic masses may be used: H=1, N=14, O=16, S=32

 SECTION A (20 Marks)

 Answer All questions in this section.

1.                For each of the items (i)-(x), choose the correct answer from the alternatives given.

(i) 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

(ii) 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

(iii) 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

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

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

(v) 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.

 (vi) 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

(vii) 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

(viii) 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

(ix)  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

(x) Moving across a period in the periodic table,

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

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.

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

1. Has both metallic and non metallic properties………………………
2. A gas that can undergo sublimation………………………..
3. Name given to group seven elements which means salt producer…………………..
4. An example of renewable fuel from organic matter…………………..
5. Separation of colored substances…………………..

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

4.(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?

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

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

5.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.

6.(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

7.(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 . 

8.State two chemical properties of water.

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

(ii) NaHC03                        (iii) Fe203 

9.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.

10.(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.

10.(b) 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.

THE PRESIDENT'S OFFICE

MINISTRY OF REGIONAL GOVERNMENT AND LOCAL GOVERNMENT

AUGUST-SEPTEMBER   EXAMINATION SERIES

CHEMISTRY FORM-2

2020

TIME: 2:30 HRS

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) 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) 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.

          SECTION B. 80 MARKS

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.(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.

7.(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

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.(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.

10.           What do you understand by the term "valency"?

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

(i) CO3

(iii) Na3P04

(iv) NO2

(v) S02

(c) State the importance of changes of state in daily life.