1) 1. 2Ca + O2 = 2CaO
2. CaO + H2O = Ca(OH)2
3. Ca(OH)2 + 2HCl = CaCl2 + 2H2O
2) 1. Fe + Cl2 = FeCl2
2. FeCl2 + 2NaOH = 2NaCl + Fe(OH)2 (осадок)
3. Fe(OH)2 (осадок) = FeO + H2O
4. 2FeO = 2Fe + O2
5. Fe + S = FeS (осадок)
3) Ca(OH)2 + 2HCl = CaCl2 + 2H2O
Ca + 2OH + 2H + 2Cl = Ca + 2Cl + 2H2O
2OH + 2H = 2H2O
4) FeCl2 + 2NaOH = 2NaCl + Fe(OH)2 (осадок)
Fe + 2Cl + 2Na + 2OH = 2Na + 2Cl + Fe(OH)2 (осадок)
Fe + 2OH = Fe(OH)2 (осадок)