1) 2Na + 2H2O = 2NaOH + H2
2) 2Cu + O2 = 2CuO
3) CuO + 2HCl = CuCl2 + H2O
4) CuCl2 + 2NaOH = Cu(OH)2 + 2NaCl
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Answers & Comments
1) 2Na + 2H2O = 2NaOH + H2
2) 2Cu + O2 = 2CuO
3) CuO + 2HCl = CuCl2 + H2O
4) CuCl2 + 2NaOH = Cu(OH)2 + 2NaCl