Question

answer all these

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Answer 1

1. the substances catches fire easily .eg,lpg,petroleum etc
2.ignitious substances, oxygen and flame
3.it is due to lack of inflammation or oxygen
4.the amount of heat produced to burn 1 kJ of a product.
5.a.burns easily immflamable
b. it is non renewable.
6.because water contains ions which flow electricity so we don't use it.

Answer 2

Hola dear♥

Here are the answers:

1: Combustion is a chemical process in which a substance reacts with oxygen to give off heat.

example: matchstick, paper etc

2: The three conditions required for combustion to take place:

★ Combustible substance

★ Oxygen gas

★ Ignition Temperature

3: It is due to lack of inflammation

4: The amount of heat given off on combustion of 1 kg of a fuel is called uts calorific value.

5: Two characteristics of ideal fuel:

★ A fuel must have high calorific value

★ A fuel should be easily available and cheap.

6: Water is not used in controlling electrical fires because these substances being lighter than water will float and spread and cause greater damage.

Hope it helps uh dear♥