"Water is referred to as the universal solvent". What does this mean?

1. Water is neither acidic nor basic as compared to other liquids.
2. Water exists in three states of matter than any other liquids.
3. Water dissolves both organic and inorganic solutes.
4. Water is used more domestically than any other liquids.
5. Water dissolves more substances than any other known liquids.

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

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

 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

  The reason why white anhydrous copper (II) sulphate turns blue when exposed in atmosphere is that it,

1.   reacts with carbon dioxide.
2. reacts with oxygen
3. becomes dry.
4. absorbs water vapour.
5. decomposes.

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

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

1. Cobalt Il oxide
2. Cobalt 111 oxide
3. Cobalt chloride
4. Copper Il chloride

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

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

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

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.

 The process of chlorination in water treatment aims at:

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

(i) Which of the following pairs constitute the best methods for treating and purifying water?

1. Chlorination and aeration
2. Chlorination and decantation
3. Chlorination and filtration
4. Chlorination and sedimentation
5. Chlorination and distillation

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) … ……… ………………… ……… ….

Use the following components to construct a diagram of water cycle: clouds, animal, water in the soil, rain, plants, water spring, rivers, lakes and water vapour in the atmosphere.

Briefly explain the basic steps you would follow in water treatment.

Outline how to test for the purity of water. (7 marks)

6.State two chemical properties of water.

6.Give four physical properties of water

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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.

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.

7. (a) State three main physical properties of water and show the usefulness of each property.

10. (a) Give two chemical tests of water and the expected result to be observed.