А) Cu⇒CuO⇒CuCl₂ ⇒Cu ⇒CuSO₄⇒Cu(OH)₂⇒CuO⇒Cu⇒Cu(NO₃)₂
2Cu + O₂ = 2CuO
CuO +2HCl = CuCl₂ + H₂O
CuCl₂ + Fe = FeCl₂ + Cu
Cu + 2H₂SO₄(конц.) = CuSO₄ + SO₂+2H₂O
CuSO₄ + 2NaOH = Cu(OH)₂ + Na₂SO₄
Cu(OH)₂ = CuO + H₂O
CuO + H₂ = Cu +H₂O
3Cu + 8HNO₃ = 3Cu(NO₃)₂ +2NO + 4H₂O
б) Na⇒Na₂O ⇒NaOH⇒Na₂CO₃ ⇒Na ⇒ NaCl⇒Na ⇒Na₂S
2Na+O₂ =2Na₂O
Na₂O + H₂O = 2NaOH
2NaOH + CO₂ = Na₂CO₃ +H₂O
1000⁰C
Na₂CO₃ + C ⇒⇒⇒⇒⇒⇒ 2Na + 3CO
2Na + Cl₂ = 2NaCl
электролиз
2NaCl ⇒⇒⇒⇒⇒⇒⇒2Na + Cl₂
2Na + S = Na₂S