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A piece of sodium is burned in nitrogen.

3Na + N₂ → 2Na₃N

Hot iron is exposed to chlorine gas

2Fe + Cl₂ → 2FeCl₃

White phosphorus reacts with limited chlorine gas

P₄ + 6Cl₂ → 4PCl₃

White phosphorus reacts with excess chlorine gas

P₄ + 10Cl₂ → 4PCl₅

Sulfur dioxide gas is passed over solid calcium oxide.

SO₂ + CaO → CaSO₃

The gases boron trifluoride and ammonia are mixed.

BF₃ + NH₃ → H₃NBF₃
(Lewis Acid-Base reaction)

Nonmetal oxide + H₂O


Metal oxide + H₂O

(metallic hydroxide)

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)

Magnesium oxide is exposed to a stream of carbon dioxide

MgO + CO₂ → MgCO₃

Magnesium oxide is heated in an atmosphere of sulfur dioxide gas

MgO + SO₂ → MgSO₃

Sulfur trioxide gas is blown over hot aluminum oxide

Al₂O₃ + SO₃ → Al₂(SO₄)₃

Metallic oxide plus carbon dioxide

Metallic carbonate

Metallic oxide plus sulfur dioxide

Metallic sulfite

Metallic oxide plus sulfur trioxide

Metallic sulfate

Carbon dioxide gas is bubbled into water

H₂O + CO₂ ↔ H₂CO₃
(the equilibrium arrow is an important part of this answer)

Lithium is burned in oxygen

4Li + O₂ → 2Li₂O

Sulfur dioxide gas is added to solid calcium oxide

SO₂ + CaO → CaSO₃

Antimony tribromide is added to a container of liquid bromine

SbBr₃ + Br₂ → SbBr₅

Magnesium oxide is added to water

MgO + H₂O → Mg(OH)₂

Solid strontium oxide is added to dinitrogen pentaphosphorus

SrO + N₂O₅ → Sr(NO₃)₂
(note: the oxidation state of N in N₂O₅ is 5+ just like in NO₃⁻)

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