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Combustion HTML5


A chemical reaction is a transformation of a group of chemicals called reactants to another group of chemicals called products.  A combustion is a chemical reaction that releases a lot of energy (usually heat) in a short amount of time.  Combustion reactions are at the heart of many industrial processes.

A combustion reaction is written in the form of an equation with the reactants on the left and the products on the right. The arrow indicates the direction of the reaction.

Since the work of Lavoisier in 1770 we have known that mass is conserved for all chemical transformations.  The Law of Conservation of Mass states that the number of atoms of each element is the same on both sides of the equation.  For that reason, it is always necessary to find the coefficients that allow the equation to be balanced.

For the combustion of methane: CH4 + 2O2 → CO2 + 2H2O
For the combustion of ethane: 2C2H6 + 7O2 → 4CO2 + 6H2O
For the combustion of propane: C 3H8 + 5O2 → 3CO2 + 4H2O

Adjust the coefficients (up and down arrows) to balance the equation then click on the button to illustrate the reaction.


Learning goals

  • To understand a combustion equation.
  • To know how to balance a chemical equation.
  • To define reactants, products,  fuel and oxidant.

Learn more

In a combustion reaction the reactants are either fuel or oxidant.

For a combustion reaction to occur, there are three necessary factors:

  1. An oxidant (generally oxygen, O2).
  2. A fuel…

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