Balance the following chemical equations. Classify the reactions as decomposition, combination, single-displacement, double-displacement, or combustion.
a. CaCl2(aq) + Na2SO4(aq) ? CaSO4(s) + NaCl(aq)
b. N2(g) + H2(g) ? NH3(g)
c. FeO(s) + CO(g) ? Fe(s) + CO2(g)
d. Ba(s) + HCl(aq) ? BaCl2(aq) + H2(g)
e. CaO(s) + H2O(l) ? Ca(OH)2(aq)
f. Na2CrO4(aq) + Pb(NO3)2(aq) ? PbCrO4(s) + NaNO3(aq)
g. KI(aq) + Cl2(g) ? KCl(aq) + I2(aq)
h. NaHCO3(s) + heat ? NaCO3(s) + CO2(g) + H2O(g)