А)
Ca+S = CaS реакция соединения
2CaS+ 3O₂=2CaO+2SO₂↑
3Ca+2H₃PO₄=Ca₃(PO₄)₂↓+3H₂↑
Б)
4Na+O₂=2Na₂O
Na₂O+H₂S=Na₂S+H₂O
2Na₂S+3O₂=2SO₂↑+ 2Na₂O
В) 2Cu+O₂ = 2CuO
Cu+Cl₂=CuCl₂
CuO+2HCl=CuCl₂+H₂O
Г)
2PbS+3O₂=2SO₂↑+2PbO
PbO+Mg=Pb+MgO
2Pb+O₂=2PbO
PbO+SO₃=PbSO₄↓
Pb+H₂SO₄=PbSO₄↓+H₂↑