Осуществить преобразования 1) cu > cuo > cuso₄ > cu(oh)₂ > cuo 2) fe > fe₂o₃ > fe₂(s0₄)₃ > fe(oh)₃ > fe₂o₃ 3) pbs < pbo > pb > pb0 > pbso₄ 4) al > al₂o₃ > al₂(so₄)₃ > al(oh)₃ > al₂o₃

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