The mode of communicating facts in chemical language about a chemical reaction is called chemical equation. Thus, a chemical equation is an expression for given chemical change in terms of symbols or formula of the reactants and products. For example, the reaction of zinc with dilute sulphuric acid to produce zinc sulphate and hydrogen is given by the following chemical equation:
Zn + H2SO→ ZnSO4 + H2
In aobve reaction those are left-hand side is reactant and other part that is left hand side is product.
