1) Zn+O2 = ZnO (Валентность Zn = 2; O = 2)
2) ZnO+2HCl = ZnCl2 + H2O (Валентность Zn = 2, Cl = 1)
3) ZnCl2+NaOH = Zn(OH)2+NaCl
4) Zn(OH)2+H2SO4 = ZnSO4+2H2O
1) Na+O2 = Na2O
2) Na2O+ H2O = 2NaOH
3) 2NaOH+H2SO3 = Na2SO3+2H2O
1) Zn+O2 = ZnO (Валентность Zn = 2; O = 2)
2) ZnO+2HCl = ZnCl2 + H2O (Валентность Zn = 2, Cl = 1)
3) ZnCl2+NaOH = Zn(OH)2+NaCl
4) Zn(OH)2+H2SO4 = ZnSO4+2H2O
1) Na+O2 = Na2O
2) Na2O+ H2O = 2NaOH
3) 2NaOH+H2SO3 = Na2SO3+2H2O