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
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 oxide plus sulfur dioxide
Metallic oxide plus sulfur trioxide
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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