Ba + F2 Na +H2O Zn +H2O Fe + HCL Cu + HCL
2Ва+ F2 = 2BaF2
2Na+ H2O = 2NaOH
Zn+ H2O = Zn( OH )2
Fe+ 2HCL = FeCL2 + H2
Cu + 2HCL = CuCL2 + H2