2N2+3O2=2N2O3 2Cu+O2=2CuO 3H2+N2=2NH3 2Zn+O2=2ZnO Zn+Cl2=ZnCl2 2K+Cl2=2KCl C+O2=CO2 4Al+3C=Al4C3 C+2H2=CH4