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Metal oxide + non-metal oxide
salt (of an oxyanion)
oxidation # of non-metal should not change (except for halogens)
Magnesium oxide is reacted with diphosphorus pentoxide
3MgO + P₂O₅ → Mg₃(PO₄)₂
(note: oxidation # of phosphorus is 5+ in P₂O₅ and in PO₄³⁻)
Sulfur dioxide gas is passed over magnesium oxide crystals
SO₂ + MgO → MgSO₃
(note: oxidation # of sulfur is 4+ in SO₂ and in SO₃²⁻)
Sulfur trioxide gas is passed over magnesium oxide crystals
SO₃ + MgO → MgSO₄
(note: oxidation # of sulfur is 6+ in SO₃ and in SO₄²⁻)
Barium oxide is added to water
BaO + H₂O → Ba²⁺ + 2OH⁻
(remember that Ba(OH)₂ is a strong base and must be represented as ions since this is a net ionic equation)
Aluminum oxide is added to water
Al₂O₃ + 3H₂O → 2Al(OH)₃
(aluminum hydroxide is a weak base and must be represented as a single compound - do not ionize it)
Carbon dioxide gas is bubbled into water
H₂O + CO₂ ↔ H₂CO₃
(the equilibrium arrow is an important part of this answer)
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