Waec Chemistry Past Questions and Answers

Question 46:

• WAEC 1988

(a) How does the collision theory explain the rate of a chemical reaction?
(b) State how each of the following affects the rates of chemical reactions:
(i) surface area (ii) catalyst

Question 47:

• WAEC 1988

(a) Write the ionic equation for the reaction between zinc powder and silver trioxonitrate (VI) solution
(b) Which substance in (a) above is (i) oxidized, (ii) reduced?
(c) State two applications of oxidation numbers

Question 48:

• WAEC 1988

(a) What is a carbohydrate?
(b) Name two types of carbohydrates and give one example of each type

Question 49:

• WAEC 1988

(a) Name the major raw materials used in the manufacture of the following:
(i) polythene
(ii) margarine
(iii) cement
(b) State one problem associated with oil producing areas

Question 50:

• WAEC 1988

Distinguish between cracking and reforming. Of what importance are the two processes in the petroleum industry?