Balancing Chemical Equations Unit 6

Using the Law of Conservation The # of atoms of each element on the reactants side of a chemical eqn MUST equal the # of atoms of each element on the products side. The # of atoms of each element on the reactants side of a chemical eqn MUST equal the # of atoms of each element on the products side. We use numbers called COEFFICIENTS to balance both sides of the reaction. We use numbers called COEFFICIENTS to balance both sides of the reaction.

Examples H2 (g) + Cl2 (g) HCl (g) H2 (g) + Cl2 (g) 2HCl (g) H2O (l) H2 (g) + O2 (g) 2H2O (l) 2H2 (g) + O2 (g) C3H8 (l) + O2 (g) CO2 (g) + H2O (g) C3H8 (l) + 5O2 (g) 3CO2 (g) + 4H2O (g) H2SO4 (aq) + Ca(OH)2 (s) H2O (l) + CaSO4 (aq) H2SO4 (aq) + Ca(OH)2 (s) 2H2O (l) + CaSO4 (aq)