Form 3 Chemistry Annual Exam with Marking Schemes 2026
Download Chemistry Form Three Annual Exam with Marking Schemes for free.
COMPETENCE BASED ASSESSMENT CHEMISTRY FORM THREE ANNUAL EXAMINATIONS
SECTION C (30 Marks)
Answer any two questions from this section.
9. (a) Describe the extraction of sodium from its ore and write all the reaction equations.
(b) State four uses of sodium metal.
10. (a) Preventing rusting involves avoiding contamination of iron and steel with water and air. State the method that can be used to prevent rusting in each of the following:
i. Iron sheet
ii. Bridges and pipes
iii. Ships
iv. Machine parts
(b) Fire extinguishers are used to stop fires. List five types of fire extinguishers.
11. (a) Briefly explain the following observations about a sample of hard water:
i. When boiled, it forms white precipitate.
ii. After boiling, water forms a scum.
iii. Sodium carbonate makes the water completely soft.
(b) With the aid of chemical equations, briefly describe the following processes:
i. The removal of temporary hardness of water by boiling.
ii. The removal of permanent hardness of water by chemical means.
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