The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.
The reaction between methane with oxygen is an example of combination reaction. The balance equation is given by
CH4 + 2O2 → CO2 + 2H2O
The reaction between methane with oxygen is an exothermic reaction.