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Chapter 21 Section 2 • A balanced equation is one that has the same number of atoms on one side as it does the other. • You use coefficients to help you balance an equation. • Once balanced make sure it is in simplest terms possible. • HgO(s) Hg(l) + O2 (g) 4 steps to help you balance • Write the chemical equation for the reaction using formulas and symbols. (Remember oxygen is a diatomic molecule, and if by itself will always be O2 ) • Count the reactants and products. • Choose coefficients that balance the equation. Remember, NEVER change subscripts of a correct formula to balance an equation. • Recheck the numbers of each atom on each side of the equation and adjust the coefficients again as needed. • Al + O2 Al2 O3 • HgO Hg + O2 • NaOH + H2 SO4 Na2 SO4 + H2 O • Fe + O2 Fe2 O3 • Pb (NO3 )2 + K2 CrO4 PbCrO4 + KNO3