Question

cu-cuo-cu(no3)2-cu(oh)2-cuo

Answer 1

1)2Cu+O2=2CuO
2)CuO+2HNO3=Cu(NO3)2+H2O
3)Cu(NO3)2+2NaOH=Cu(OH)2+2NaNO3
4)Cu(OH)2=CuO+H2O