Balancing Chemical Equations Worksheet for 9th - 12th Grade ... - Free Printable

1) N₂ + 3H₂ → 2NH₃
2) KClO₃ → KCl + 3/2O₂ (or 2KClO₃ → 2KCl + 3O₂)
3) NaCl + F₂ → NaF + Cl₂ (unbalanced as written; correct balanced form is 2NaCl + F₂ → 2NaF + Cl₂)
4) H₂ + O₂ → H₂O (unbalanced as written; correct balanced form is 2H₂ + O₂ → 2H₂O)
5) AgNO₃ + MgCl₂ → AgCl + Mg(NO₃)₂ (unbalanced as written; correct balanced form is 2AgNO₃ + MgCl₂ → 2AgCl + Mg(NO₃)₂)
6) AlBr₃ + K₂SO₄ → KBr + Al₂(SO₄)₃ (unbalanced as written; correct balanced form is 2AlBr₃ + 3K₂SO₄ → 6KBr + Al₂(SO₄)₃)
7) CH₄ + O₂ → CO₂ + H₂O (unbalanced as written; correct balanced form is CH₄ + 2O₂ → CO₂ + 2H₂O)
8) Hg + O₂ → HgO (unbalanced as written; correct balanced form is 2Hg + O₂ → 2HgO)
9) C₃H₈ + O₂ → CO₂ + H₂O (unbalanced as written; correct balanced form is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)
10) FeCl₃ + NaOH → Fe(OH)₃ + NaCl (unbalanced as written; correct balanced form is FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl)
11) P₄ + O₂ → P₂O₅ (unbalanced as written; correct balanced form is P₄ + 5O₂ → 2P₂O₅)
12) H₂ + N₂ → NH₃ (unbalanced as written; correct balanced form is 3H₂ + N₂ → 2NH₃)
13) Ag₂O → Ag + O₂ (unbalanced as written; correct balanced form is 2Ag₂O → 4Ag + O₂)
14) S₈ + O₂ → SO₂ (unbalanced as written; correct balanced form is S₈ + 8O₂ → 8SO₂)
15) CO₂ + H₂O → C₆H₁₂O₆ + O₂ (unbalanced as written; correct balanced form is 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂)
16) Ca + H₃PO₄ → Ca₃(PO₄)₂ + H₂ (unbalanced as written; correct balanced form is 3Ca + 2H₃PO₄ → Ca₃(PO₄)₂ + 3H₂)
17) KI + CaSO₄ → CaI₂ + K₂SO₄ (unbalanced as written; correct balanced form is 2KI + CaSO₄ → CaI₂ + K₂SO₄)
18) HNO₃ + NaHCO₃ → NaNO₃ + H₂O + CO₂ (already balanced)
19) H₂O + NaCl → NaOH + HCl (unbalanced as written; this reaction does not typically occur under normal conditions, but if forced to balance the given equation, it would be H₂O + NaCl → NaOH + HCl — which is already balanced atom-wise but chemically implausible)
20) NaBr + CaF₂ → NaF + CaBr₂ (unbalanced as written; correct balanced form is 2NaBr + CaF₂ → 2NaF + CaBr₂)