2К + Cl2 = 2KCl
Ba + S = BaS
Cu + Cl2 = CuCl2
2Na + S = Na2S
2P + 5Cl2 = 2PСl5
2NCl + Mg = MgCl2 + N2
N2 + 3H2 = 2NH
2НgO = 2Hg + O2