3 и 4 плииииззззззззззззззз

Question

3 и 4
плииииззззззззззззззз

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Answer 1

3.
CuO + 2HCl = CuCl2+H2O
CuCl2 + 2NaOH = Cu(OH)2+2NaCl
Cu(OH)2 =t=> CuO + H2O
4.
Na2O + 2HCl = 2NaCl + H2O
Na2O + CO2 = Na2CO3
Na2O + H2O = 2NaOH