Question

Cu-CuO- CuCl2- Cu( OH)2-H2O-H2-HCl

Answer 1

Cu-CuO- CuCl2- Cu( OH)2-H2O-H2-HCl
2Cu+O2=2CuO      CuO+2HCl= CuCl2+H2O
CuCl2+2NaOH=Cu(OH)2 +2NaCl
Cu(OH)2=CuO+H2O
2H2O=2H2+O2
H2+Cl2=2HCl

Answer 2

2Сu + O2 = 2CuO
CuO + 2HCl = CuCl2 + H2O
CuCl2 + 2NaOH = Cu(OH)2 + 2NaCl
Cu(OH)2 = CuO + H2O
2H2O + 2Na = 2NaOH + H2
H2 + Cl2 = 2HCl