A balanced chemical equation is one which contains an equal number of atoms of each element on both sides of the equation. For example,
2H2+ O2 -----> 2H2O
According to the law of conservation of mass, matter can neither be created nor destroyed in a chemical reaction. During a chemical reaction, the total mass of reactants and products remain the same. Hence, in a chemical reaction, the number of atoms of the various elements on both sides should be equal. 'therefore, a chemical equation is to be balanced in accordance with the law of conservation of mass.
