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.

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

View Ans

(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.

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.