4Fe + 3O₂ = 2Fe₂O₃
Fe₂O₃ + 3H₂SO₄ = Fe₂(SO₄)₃ + 3H₂O
Fe₂(SO₄)₃ + 3BaCl₃ = 2FeCl₃ + 3BaSO₄
2Ca + O₂ = 2CaO
CaO + H₂O = Ca(OH)₂
Ca(OH)₂ + 2HCl = CaCl₂ + 2H₂O
2Na +2H₂O = 2NaOH + H₂
2NaOH + CO₂ = Na₂CO₃ + H₂O
Na₂CO₃ + MgSO₄ = MgCO₃ + Na₂SO₄
Na₂SO₄ + BaCl₂ = BaSO₄ + 2NaCl
NaCl + AgNO₃ = NaNO₃ + AgCl