1) Cu > CuO > CuSO₄ > Cu(OH)₂ > CuO
2Cu+O2->2CuO
CuO+H2SO4->CuSO4+H2O
CuSO4+2NaOH->Cu(OH)2+Na2SO4
Cu(OH)2->CuO+H2O
2) Fe > Fe₂O₃ > Fe₂(S0₄)₃ > Fe(OH)₃ > Fe₂O₃
4Fe+3O2->2Fe2O3
Fe2O3+3H2SO4->Fe2(SO4)3+3H2O
Fe2(SO4)3+6KOH->2Fe(OH)3+3K2SO4
2Fe(OH)3->Fe2O3+3H2O
3) PbS > PbO > Pb > PbO > PbSO₄
PbS+Na2O->PbO+Na2S
2PbO->2Pb+O2
2Pb+O2->2PbO
PbO+Li2SO4->PbSO4+Li2O
4) Al > Al₂O₃ > Al₂(SO₄)₃ > Al(OH)₃ > Al₂O₃
4Al+3O2->2Al2O3
Al2O3+3H2SO4->Al2(SO4)3+3H2O
Al2(SO4)3+6NaOH->2Al(OH)3+3Na2SO4
2Al(OH)3->Al2O3+3H2O