2Cu+ O2\(\xrightarrow[]{to}\) 2CuO
CuO+ H2\(\xrightarrow[]{to}\) Cu+ H2O
2H2O\(\xrightarrow[]{đp}\) 2H2+ O2
PbO+ H2\(\xrightarrow[]{to}\) Pb+ H2O
(1)2Cu + O2 -> 2CuO
(2) CuO+ H2 -> Cu + H2O
(3)2H2O ->2H2 + O2
(4)PbO + H2 -> H2O + Pb
(1)2Cu+O2--to--->2CuO
(2)CuO+H2--to--->Cu+H2O
(3)2H2O--to--->2H2+O2
(4)H2+PbO--to--->Pb+H2O