1) CuSO4 + K = KSO4 + Cu
2Cu + O2 = 2CuO
CuO + H2O = Cu(OH)2
2) Cu(OH)2 + Ca = Ca(OH)2 + Cu
3) CuO + 2HCl = CuCl2 + H2O
4) CuCl2 + Mg = MgCl2 + Cu
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Answers & Comments
1) CuSO4 + K = KSO4 + Cu
2Cu + O2 = 2CuO
CuO + H2O = Cu(OH)2
2) Cu(OH)2 + Ca = Ca(OH)2 + Cu
2Cu + O2 = 2CuO
3) CuO + 2HCl = CuCl2 + H2O
4) CuCl2 + Mg = MgCl2 + Cu