2Cu + O2 = 2CuO CuO + 2HC1(разб.) = CuCl2 + H2O CuCl2 + 2NaOH(разб.) = Cu(OH)2↓ + 2NaCl Cu(OH)2 = CuO + H2O CuO + H2SO4 = CuSO4 + H2O