Class 8 - Science - Combustion and Flame (Worksheet)

Directions: Fill in the blanks with suitable words/definitions.

1. The combustion in which the gas burns rapidly and produces heat and light is called ________ combustion.

2. The combustion in which no external heat is given is known as __________ combustion. e.g. burning of white phosphorus in air.

3. The combustion in which large amount of gases are evolved with the production of tremendous amount of heat, light and sound is called _________.

4. Water absorbs a lot of heat and brings down _________ temperature below normal level and fire is blown out.

5. Sand, soil, thick clothes like blanket etc. are thrown upon the burning surface to cut off ___________.

6. A chemical process in which a substance reacts with oxygen to give off heat and light is called _________.

7. When charcoal burns in air it gives ___________ gas and heat.

8. Methane bums in air forming _________ gas, ________ and heat.

9. Substances that do not catch fire easily are called ____________ substances. For example: Glass, Stone etc.

10. Those material which have low ignition temperature and catch fire easily are termed as _________ substances. e.g. petrol

Answers:

1. rapid

2. spontaneous

3. explosion

4. ignition

5. air supply / the supply of air.

6. combustion

7. carbon dioxide

8. carbon dioxide, water

9. non - combustible

10. inflammable

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