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hydrocarbon excercise, Exercises of Chemistry

Chemistry

hydrocarbon excercise for students

Typology: Exercises

2025/2026

Uploaded on 07/01/2026

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35 Balancing Chemical Equations from Word Equations (with
States) – Answer Key
1. Iron(III) sulfate reacts with potassium hydroxide to produce iron(III)
hydroxide and potassium sulfate.
Fe₂(SO₄)₃(aq) + 6KOH(aq) → 2Fe(OH)₃(s) + 3K₂SO₄(aq)
2. Aluminum nitrate reacts with sodium phosphate to produce
aluminum phosphate and sodium nitrate.
Al(NO₃)₃(aq) + Na₃PO₄(aq) → AlPO₄(s) + 3NaNO₃(aq)
3. Copper(II) nitrate decomposes into copper(II) oxide, nitrogen
dioxide, and oxygen gas.
2Cu(NO₃)₂(s) → 2CuO(s) + 4NO₂(g) + O₂(g)
4. Potassium chlorate decomposes into potassium chloride and oxygen
gas.
2KClO₃(s) → 2KCl(s) + 3O₂(g)
5. Calcium phosphate reacts with sulfuric acid to produce calcium
sulfate and phosphoric acid.
Ca₃(PO₄)₂(s) + 3H₂SO₄(aq) → 3CaSO₄(s) + 2H₃PO₄(aq)
6. Sodium carbonate reacts with iron(III) chloride to produce iron(III)
carbonate and sodium chloride.
2FeCl₃(aq) + 3Na₂CO₃(aq) → Fe₂(CO₃)₃(s) + 6NaCl(aq)
7. Ammonium dichromate decomposes into chromium(III) oxide,
nitrogen gas, and water.
(NH₄)₂Cr₂O₇(s) → Cr₂O₃(s) + N₂(g) + 4H₂O(g)
8. Magnesium hydroxide reacts with phosphoric acid to produce
magnesium phosphate and water.
3Mg(OH)₂(s) + 2H₃PO₄(aq) → Mg₃(PO₄)₂(s) + 6H₂O(l)
9. Silver nitrate reacts with sodium chromate to produce silver
chromate and sodium nitrate.
2AgNO₃(aq) + Na₂CrO₄(aq) → Ag₂CrO₄(s) + 2NaNO₃(aq)
10. Barium hydroxide reacts with sulfuric acid to produce barium
sulfate and water.
Ba(OH)₂(aq) + H₂SO₄(aq) → BaSO₄(s) + 2H₂O(l)
11. Potassium permanganate decomposes into potassium
manganate, manganese dioxide, and oxygen gas.
2KMnO₄(s) → K₂MnO₄(s) + MnO₂(s) + O₂(g)
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35 Balancing Chemical Equations from Word Equations (with States) – Answer Key

  1. Iron(III) sulfate reacts with potassium hydroxide to produce iron(III) hydroxide and potassium sulfate. Fe₂(SO₄)₃(aq) + 6KOH(aq) → 2Fe(OH)₃(s) + 3K₂SO₄(aq)
  2. Aluminum nitrate reacts with sodium phosphate to produce aluminum phosphate and sodium nitrate. Al(NO₃)₃(aq) + Na₃PO₄(aq) → AlPO₄(s) + 3NaNO₃(aq)
  3. Copper(II) nitrate decomposes into copper(II) oxide, nitrogen dioxide, and oxygen gas. 2Cu(NO₃)₂(s) → 2CuO(s) + 4NO₂(g) + O₂(g)
  4. Potassium chlorate decomposes into potassium chloride and oxygen gas. 2KClO₃(s) → 2KCl(s) + 3O₂(g)
  5. Calcium phosphate reacts with sulfuric acid to produce calcium sulfate and phosphoric acid. Ca₃(PO₄)₂(s) + 3H₂SO₄(aq) → 3CaSO₄(s) + 2H₃PO₄(aq)
  6. Sodium carbonate reacts with iron(III) chloride to produce iron(III) carbonate and sodium chloride. 2FeCl₃(aq) + 3Na₂CO₃(aq) → Fe₂(CO₃)₃(s) + 6NaCl(aq)
  7. Ammonium dichromate decomposes into chromium(III) oxide, nitrogen gas, and water. (NH₄)₂Cr₂O₇(s) → Cr₂O₃(s) + N₂(g) + 4H₂O(g)
  8. Magnesium hydroxide reacts with phosphoric acid to produce magnesium phosphate and water. 3Mg(OH)₂(s) + 2H₃PO₄(aq) → Mg₃(PO₄)₂(s) + 6H₂O(l)
  9. Silver nitrate reacts with sodium chromate to produce silver chromate and sodium nitrate. 2AgNO₃(aq) + Na₂CrO₄(aq) → Ag₂CrO₄(s) + 2NaNO₃(aq)
  10. Barium hydroxide reacts with sulfuric acid to produce barium sulfate and water. Ba(OH)₂(aq) + H₂SO₄(aq) → BaSO₄(s) + 2H₂O(l)
  11. Potassium permanganate decomposes into potassium manganate, manganese dioxide, and oxygen gas. 2KMnO₄(s) → K₂MnO₄(s) + MnO₂(s) + O₂(g)
  1. Sodium thiosulfate reacts with hydrochloric acid to produce sulfur, sulfur dioxide, sodium chloride, and water. Na₂S₂O₃(aq) + 2HCl(aq) → S(s) + SO₂(g) + 2NaCl(aq) + H₂O(l)
  2. Iron(III) oxide reacts with carbon monoxide to produce iron and carbon dioxide. Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g)
  3. Aluminum reacts with copper(II) sulfate to produce aluminum sulfate and copper. 2Al(s) + 3CuSO₄(aq) → Al₂(SO₄)₃(aq) + 3Cu(s)
  4. Calcium hydroxide reacts with phosphoric acid to produce calcium phosphate and water. 3Ca(OH)₂(aq) + 2H₃PO₄(aq) → Ca₃(PO₄)₂(s) + 6H₂O(l)
  5. Sodium bicarbonate decomposes into sodium carbonate, carbon dioxide, and water. 2NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)
  6. Zinc reacts with silver nitrate to produce zinc nitrate and silver. Zn(s) + 2AgNO₃(aq) → Zn(NO₃)₂(aq) + 2Ag(s)
  7. Lead(II) nitrate reacts with potassium iodide to produce lead(II) iodide and potassium nitrate. Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq)
  8. Copper reacts with concentrated nitric acid to produce copper(II) nitrate, nitrogen dioxide, and water. Cu(s) + 4HNO₃(aq) → Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(l)
  9. Sodium sulfite reacts with hydrochloric acid to produce sodium chloride, sulfur dioxide, and water. Na₂SO₃(aq) + 2HCl(aq) → 2NaCl(aq) + SO₂(g) + H₂O(l)
  10. Iron(II) sulfide reacts with hydrochloric acid to produce iron(II) chloride and hydrogen sulfide. FeS(s) + 2HCl(aq) → FeCl₂(aq) + H₂S(g)
  11. Potassium dichromate reacts with hydrochloric acid to produce chromium(III) chloride, potassium chloride, chlorine gas, and water. K₂Cr₂O₇(aq) + 14HCl(aq) → 2CrCl₃(aq) + 2KCl(aq) + 3Cl₂(g) + 7H₂O(l)
  12. Sodium phosphate reacts with calcium chloride to produce calcium phosphate and sodium chloride. 2Na₃PO₄(aq) + 3CaCl₂(aq) → Ca₃(PO₄)₂(s) + 6NaCl(aq)

_ Fe₂(SO₄)₃(aq) + _ KOH(aq) → _ Fe(OH)₃(s) + _ K₂SO₄(aq) _ Al(NO₃)₃(aq) + _ Na₃PO₄(aq) → _ AlPO₄(s) + _ NaNO₃(aq) _ Cu(NO₃)₂(s) → _ CuO(s) + _ NO₂(g) + _ O₂(g) _ KClO₃(s) → _ KCl(s) + _ O₂(g) _ Ca₃(PO₄)₂(s) + _ H₂SO₄(aq) → _ CaSO₄(s) + _ H₃PO₄(aq) _ FeCl₃(aq) + _ Na₂CO₃(aq) → _ Fe₂(CO₃)₃(s) + _ NaCl(aq) _ (NH₄)₂Cr₂O₇(s) → _ Cr₂O₃(s) + _ N₂(g) + _ H₂O(g) _ Mg(OH)₂(s) + _ H₃PO₄(aq) → _ Mg₃(PO₄)₂(s) + _ H₂O(l)

_ AgNO₃(aq) + _ Na₂CrO₄(aq) → _ Ag₂CrO₄(s) + _ NaNO₃(aq) _ Ba(OH)₂(aq) + _ H₂SO₄(aq) → _ BaSO₄(s) + _ H₂O(l) _ KMnO₄(s) → _ K₂MnO₄(s) + _ MnO₂(s) + _ O₂(g) _ Na₂S₂O₃(aq) + _ HCl(aq) → S(s) + SO₂(g) + _ NaCl(aq) + H₂O(l) _ Fe₂O₃(s) + _ CO(g) → _ Fe(s) + _ CO₂(g) _ Al(s) + _ CuSO₄(aq) → _ Al₂(SO₄)₃(aq) + _ Cu(s) _ Ca(OH)₂(aq) + _ H₃PO₄(aq) → _ Ca₃(PO₄)₂(s) + _ H₂O(l) _ NaHCO₃(s) → _ Na₂CO₃(s) + _ CO₂(g) + _ H₂O(g)

_ C₂H₅OH(l) + _ O₂(g) → _ CO₂(g) + _ H₂O(g) _ C₃H₆(g) + _ O₂(g) → _ CO₂(g) + _ H₂O(g) _ C₄H₆(g) + _ O₂(g) → _ CO₂(g) + _ H₂O(g) _ C₆H₁₄(l) + _ O₂(g) → _ CO₂(g) + _ H₂O(g) _ FeS₂(s) + _ O₂(g) → _ Fe₂O₃(s) + _ SO₂(g) _ CaCO₃(s) + _ H₃PO₄(aq) → _ Ca₃(PO₄)₂(s) + _ CO₂(g) + _ H₂O(l) _ K₄Fe(CN)₆(aq) + _ FeCl₃(aq) → _ Fe₄[Fe(CN)₆]₃(s) + _ KCl(aq) _ NaAlO₂(aq) + _ HCl(aq) + _ H₂O(l) → _ Al(OH)₃(s) + _ NaCl(aq)

_ NH₄NO₃(s) → _ N₂(g) + _ O₂(g) + _ H₂O(g) _ Cu₂S(s) + _ O₂(g) → _ CuO(s) + _ SO₂(g) _ KHC₄H₄O₆(aq) + _ NaOH(aq) → _ KNaC₄H₄O₆(aq) + _ H₂O(l)