A ____________ process in which a substance reacts with __________ to give off heat is called combustion.

A chemical process in which a substance reacts with oxygen to give off heat is called combustion.

Explanation

A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substance that undergoes combustion is said to be combustible. It is also called a fuel. The fuel may be solid, liquid or gas. Sometimes, light is also given off during combustion, either as a flame or as a glow

Some examples of combustion are

  1. Burning of sulphur in the air
  2. An explosion of hydrogen in air
  3. Burning of Wax candle
  4. Combustion of petrol in a car’s engine

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