Question

Cu==>СuO ==>Cu SO4 ==> Cu(OH)2==>СuO==>Cu

Answer 1

1)2Cu+O2=2CuO 
2)CuO+H2SO4=CuSO4+H2O 
3)CuSO4+Ba(OH)2=Cu(OH)2+BaSO4 
4)Cu(OH)2=CuO+H2O 
5)CuO+H2=Cu+H2O

Answer 2

2Cu + O2 = 2CuO
CuO + H2SO4 = CuSO4 + H2O
CuSO4 + 2NaOH = Cu(OH)2 + Na2SO4
Cu(OH)2 --t--> CuO + H2O
2CuO --t--> 2Cu + O2