Page 76 - ScienceStd4

(c) To support the ignition of the fire

(d) To convert the fire into water

4. What happens during the combustion process?
FOR ONLINE READING ONLY
(a) Substances turn cold

(b) Substances lose their original nature

(c) Substances release cold energy

(d) Substances remain unchanged

Section B: Write TRUE for a correct statement and FALSE for

an incorrect statement

5. Combustion helps us iron our clothes.

6. It is advised to minimise or stop using firewood because it
leads to environmental degradation.

7. Wet pieces of cloth can be used to handle hot containers.

Section C: Short answer questions

8. What do you understand about the combustion process?

9. Briefly explain the conditions necessary for combustion to
take place.

10. Briefly explain four effects of combustion.

11. How can combustion pollute the environment?

12. What is complete combustion?

13. Explain the condition necessary for incomplete combustion.

14. Explain the safety measures you will use when handling a
hot charcoal burner.

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