Question

Сu-->CuO-->x-->Cu(OH)2-->y-->Cu

Answer 1

2Cu+O2=2CuO

CuO+2HCl=CuCl2+H2O

CuCl2+2NaOH=Cu(OH)2+2NaCl

Cu(OH)2=CuO+H2O

CuO+H2=Cu+H2O