Writing Chemical Formulae - Definition, Detailed ...
· Convention used in Writing Chemical Equations. Four convention are used to write chemical equations. 1. The correct formulas of the reactants are always written on the left side of the equation. CaS + H2O → CaO + H2S. The correct formulas of the products are always written on the right side of the equation. CaS + H2O → CaO + H2S.