A chemiacal equation is generally defined as the chain of events that lead to a chemical reaction that is displayed visually on paper. In order to balance a chemical equation, one must make certain that each side of the equation is balanced. Whatever you do to one side of the equation, you must do to the other. For example, if you wanted to balance the chemical equation of Cl2 + NaL —-> Cl2 + N2 —-> Mg + N2—> Co(NO3)2+H2S = Cl2+2 Nal = 2 NaCl l2. 3MG + N2= Mg3N2. Co(NO3)2+H2S= CoS + 2HNO3.