$2Cu + O_2 \overset{t^0}{\rightarrow} 2CuO$
$CuO + C_2H_5OH \overset{t^0}{\rightarrow} Cu + CH_3CHO + H_2O$
$CH_3CHO + 2Ag(NH_3)_2OH \rightarrow CH_3COONH_4 + 2Ag \downarrow + 3NH_3 + H_2O$
$CuO + H_2 \overset{t^0}{\rightarrow} Cu + H_2O$
$3Cu + 8HNO_3 \rightarrow 2Cu(NO_3)_2 + 2NO \uparrow + 4H_2O$