Combustion is the chemical reaction that takes place when a substance burns and reacts with oxygen to produce heat and light energy. Examples of combustible substances that undergo this reaction include paper, wood, coal, and magnesium ribbon. Non-combustible substances like nails and water do not burn. The combustion reaction requires oxygen - when oxygen is removed, a burning candle will go out. Common combustion reactions include magnesium burning to form magnesium oxide, hydrogen burning to form water, and carbon in coal burning to form carbon dioxide.

1. By: AN Academy

2. What is Combustion?
Combustion is the scientific word for burning.
It is the chemical reaction that takes place when a
substance burns and reacts with oxygen to produce
heat and light energy.

3. Activity of Burning Magnesium
Ribbon
1. Magnesium burns and form Magnesium Oxide
Magnesium Oxygen Magnesium Oxide+ 
2Mg O2 2MgO+ 

4. Combustible Substance
Non - Combustible Substance
The Substance which burns in Air are called
Combustible Substance. Examples of Combustible
Substances are Papers, Petrol, Woods, Coal.
The Substance which didn’t burns in Air are called Non-
Combustible Substance. Examples Nails, Water, Sand
are Non- Combustible Substances.

5. Oxygen is Necessary for Burning
In the below activity when we put a closed vessel or closed an
open vessel in which a candle is burning. Then the candle
stops burning in some time. By this we can conclude that
oxygen is necessary for burning.

6. Some Other Examples and Equation of
Combustion.
1. Magnesium burns and form Magnesium Oxide
2. Hydrogen burns and forms dihydrogen oxide (i.e water!).
3. Coal (made from carbon) burns and forms carbon dioxide
Carbon Oxygen Carbon Dioxide+ 
C O2 CO2+ 
Hydrogen oxygen Water+ 
2H2 O2 2H2O+ 
Magnesium Oxygen Magnesium Oxide+ 
2Mg O2 2MgO2
+ 

7. Rapid Combustion : Substance
like Petrol catches fire quickly
and evolved large amount of
heat in very short time. This
kind of combustion is known as
Rapid Combustion.