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

Which one of the following processes is a chemical change?

1. Butter melts on warm toast
2. Water evaporates from the surface
3. Juice in a bottle freezes
4. Food scrap turns into compost
5. Wet cloth dries

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

A.Decantation  

B. Distillation

D. Grinding followed by squeezingChoose Answer : - - A B C D E

 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

  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

John and Asha were debating about the process that are involved during simple distillation. What processes will you recommend to them?

1. Filtration and decantation
2. Condensation and decantation
3. Evaporation and filtration
4. Evaporation and condensation

   Chemical change means;

1.   the change is reversible.
2. can easily be separated.
3. the change is complete.
4. new substance is produced.
5. produces no change of mass.

Which state is involved when drying wet clothes?

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

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.

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.

What does the random movement of pollen grains suspended in air demonstrates?

1. Matter is lighter in nature.
2. Matter is solid in nature.
3. Matter is particulate in nature.
4. Matter is gaseous in nature. 
5. Matter is wave in nature.

   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

The most abundant element on the earth is:

A.carbon  

 B. iron

 C. nitrogen  

 D. oxygen

What conclusion can be drawn from the random movement of pollen grains suspended in air?

1. Matter is lighter in nature.
2. Matter is solid in nature.
3. Matter is particulate in nature.
4. Matter is gaseous in nature.
5. Matter is wave in nature.

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.

Which of the following is a metal?

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

 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

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

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

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.

 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

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

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

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

  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

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.

   When you melt a piece of iron, it undergoes:

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

Coloured substances can be separated through the process called:

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

   Which of the following compounds contains only two elements?

1.   Magnesium hydroxide
2. Magnesium nitride
3. Magnesium phosphate
4. Magnesium sulphite
5. Magnesium sulphate.

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.

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.

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.

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

    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

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

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

The teacher was demonstrating an experiment by dissolving sodium chloride in water until the solute was not dissolving any more. What type of solution formed at the end of the experiment?

1. Saturated
2. Unsaturated
3. Super saturated
4. Suspension

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

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

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

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

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

(i)Rusting of iron sheets

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.

(b)      Give three differences between the following:

(i)Physical changes and chemical changes

(ii)Mixture and compounds

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 .........

Give three differences between the following:

(i) Compound and mixture

(ii) Suspension and solution

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

State the valency of each ofthe following atoms:

(i) Aluminium

(ii) Neon

 (iii) Sulphur

(iv) Potassium

(a) In three points, differentiate homogenous mixtures from heterogeneous mixtures

(b) By giving four points, justify the fact that common salt is a compound.

Match the physical processes represented by arrows (i) - (v) in List A with the corresponding terms in List B by writing the letter of the correct response beside the item number in the answer booklet provided.

Giving an example for each, give four uses of matter in daily life.

Why are chemical symbols useful in Chemistry? Give three reasons. (7 marks)

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.

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?

(a) How useful is matter in our daily life? Give four points with an example for each.

(b) Why are the chemical symbols important in Chemistry? Give three reasons.

Consider the following substances: milk, copper, soap, steel, chlorine and sugar.

(a) Identify the elements, compounds and mixtures from the list.

(b) Give four differences between the elements identified in (a).

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

 (b) Why some of the elements in 9(a) are assigned symbols with only one letter while others bear symbols with two letters?        (7 marks)

10.(a) Give three advantages of using chemical equations over word equations.

(b) Write the names of the following processes of changing matter from one state to another.

(i) Gas to liquid. 

(ii) Ga s to solid. 

(iii) Solid t o gas .

Match the mixtures in List A with the corresponding methods of separation in List B by writing the letter of the correct answer below the item number in the table provided.

(a)A chemist heated a mixture of ammonium chloride and sand in a test tube. After 5 minutes, only sand remained in the test tube. Explain the observation that made by chemist.

(b) A gardener became sick and decided to rush to hospital. After checkup, the doctor prescribed medicines and instructed the gardener to shake the medicines well before use. What does the instruction imply basing on the type of the mixture? Given reason to support your answer.

(c)Differentiate mixture from compound by given five points.

(b)  Give two examples in each of the following solution.

(i)  Gaseous solution.

(ii) Solid solution.

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.

(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 ……………….

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

(i) Spatula…………… …………… ……………….

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