2025/2026 1st Term Examination on Chemistry for JS2

Crude oil is mainly composed of

Crude oil is called 'crude' because it is

3. In a fractionating column, which fraction is collected at the top

4. Petrochemicals are obtained from

5. Fractional distillation separates crude oil based on

6. Which of the following is a product of ethylene?

7. Which fraction of crude oil is commonly used as jet fuel

8. Urea, a fertilizer, is the obtained from

9. Which of the following allotropes of carbon is the hardest natural substance?

10. Why is graphite a good conductor of electricity?

11. Which allotrope of carbon is used in pencils

12. Which of the following is an amorphous form of carbon

13. Chemical industry is mainly concerned with

14. Which of the following is an example of a heavy chemical

15. The industry that produces plastics, synthetic fibres, and detergents from petroleum is called

16. Which of the following is a fine chemical

17. One major factor influencing the location of chemical industries in Nigeria is

18. Which of the following is a physical change?

19. Dangote fertilizer plant in Nigeria mainly produces

20. Which of these is a chemical change

21. Rusting of iron is caused by the reaction of iron with

22. Which of the following is a way to prevent rusting

23. Which observation indicates that a chemical change has taken place?

24. Freezing water is an example of

25. Which process releases carbon dioxide back into the atmosphere

26. Which gas produces effervescence on a liquid

27. Physical changes are generally

28. What is the chemical symbol of carbon

29. Which form of carbon is used in making jewellery and cutting tools

30. The carbon found in the cell walls of plants is in the form of

SECTION B (ANSWER ALL)

1. How many bond does a carbon atom have?

2. All changes in states of mater is referred to as – change

3. The chemical formula for rust is –

4. – is an example of a natural chemical

5. An example of a harmful chemical is –

6. The chemical industry that produces perfumes and cosmetics is called –

7. The atomic number of carbon is –

8. In a fractionating column, heavier hydrocarbons condense at the – part of the column.

9. – and — are examples of petrochemicals

10. The gas that is produced from incomplete combustion of carbon or when carbon burns in limited supply of oxygen is –

THEORY (ANSWER 4 QUESTIONS ONLY)

1a. Define the following I. physical change II. chemical change 1b. Write 4 examples each of physic and chemical changes

2a. What is rusting? 2b. State 3 causes of rusting 2c. Discuss 3 preventive measures of rusting

3a. Define a chemical 3b. Give 2 examples of chemical based on the following: I. Based on origin Ii. Based on composition Iii. Based on use/function Iv. Based on physical state 3c. State 3 safety measures for chemicals

4a. Define chemical industry 4b. Mention the divisions of chemical industry, giving 2 examples each.

5a. What is crude oil? 5b. What is meant by fractional distillation of crude oil 5c. Define petrochemicals 5d. Mention 2 petrochemicals and their products/uses

6a. Mention 3 allotropes of carbon 6b. State one use of each allotrope mentioned above 6c. What are the oxides of carbon? 6d. Itemize two forms carbon can be found in: I. Animal Ii. Plants