The final answer would be 2Cu O2---> 2CuO
Cu + HNO3 = Cu(NO3)2 + NO + H2O
CuS04 + 2Na -> Na2SO4 + Cu
Cu-------Cu2+ + 2 e-
The chemical equation is:2 Al +3 CuCl2 = 3 Cu + 2 AlCl3
PbCl2 + Cu
Zn + CuSO4 --> ZnSO4 + Cu
Cu + 4HNO3 ----->Cu(NO3)2 + 2NO2 + 2H20
CO2 is not an equation, so it cannot be balanced. It is a chemical formula.
It is a single displacement reaction. No balancing is needed in the resulting equation. Zn + CuBr2 ----> ZnBr2 + Cu
Cu + S = CuS
Cu(NO3)2 an NaCl don't react, so there is not a balanced equation.
Cu(NO3)2(aq) + Na2CO3(aq) -> 2NaNO3(aq) + CuCO3(aq)