49 Balancing Chemical Equations Worksheets [with Answers] - Free Printable

1.
a. 2 Cu(s) + 1 O₂(g) → 2 CuO(s) — formation
b. 2 H₂O(l) → 2 H₂(g) + 1 O₂(g) — decomposition
c. 3 Fe(s) + 4 H₂O(g) → 4 H₂(g) + 1 Fe₃O₄(s) — single replacement
d. 2 AsCl₃(aq) + 3 H₂S(aq) → 1 As₂S₃(s) + 6 HCl(aq) — double replacement
e. 1 CuSO₄•5H₂O(s) → 1 CuSO₄(s) + 5 H₂O(g) — decomposition
f. 1 Fe₂O₃(s) + 3 H₂(g) → 2 Fe(s) + 3 H₂O(l) — single replacement
g. 1 CaCO₃(s) → 1 CaO(s) + 1 CO₂(g) — decomposition
h. 8 Fe(s) + 1 S₈(s) → 8 FeS(s) — formation
i. 1 H₂S(aq) + 2 KOH(aq) → 2 H₂O(l) + 1 K₂S(aq) — double replacement
j. 2 NaCl(l) → 2 Na(l) + 1 Cl₂(g) — decomposition
k. 2 Al(s) + 3 H₂SO₄(aq) → 3 H₂(g) + 1 Al₂(SO₄)₃(aq) — single replacement
l. 1 H₃PO₄(aq) + 3 NH₄OH(aq) → 3 H₂O(l) + 1 (NH₄)₃PO₄(aq) — double replacement
m. 1 C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(l) — hydrocarbon combustion
n. 4 Al(s) + 3 O₂(g) → 2 Al₂O₃(s) — formation
o. 1 CH₄(g) + 2 O₂(g) → 1 CO₂(g) + 2 H₂O(l) — hydrocarbon combustion
p. 1 K₂SO₄(aq) + 1 BaCl₂(aq) → 2 KCl(aq) + 1 BaSO₄(s) — double replacement
q. 1 C₅H₁₂(l) + 8 O₂(g) → 5 CO₂(g) + 6 H₂O(g) — hydrocarbon combustion
r. 1 Ca(OH)₂(aq) + 2 NH₄Cl(aq) → 2 NH₄OH(aq) + 1 CaCl₂(aq) — double replacement
s. 1 V₂O₅(s) + 5 Ca(s) → 5 CaO(s) + 2 V(s) — single replacement
t. 2 Na(s) + 1 ZnI₂(aq) → 2 NaI(aq) + 1 Zn(s) — single replacement
u. 2 C₇H₆O₃(l) + 13 O₂(g) → 14 CO₂(g) + 6 H₂O(l) — hydrocarbon combustion
v. 3 Ca(s) + 1 N₂(g) → 1 Ca₃N₂(s) — formation
w. 1 Fe₂O₃(s) + 3 H₂(g) → 2 Fe(s) + 3 H₂O(l) — single replacement
x. 2 C₁₅H₃₀(l) + 45 O₂(g) → 30 CO₂(g) + 30 H₂O(g) — hydrocarbon combustion
y. 2 BN(s) + 3 F₂(g) → 2 BF₃(s) + 1 N₂(g) — single replacement
z. 2 C₁₂H₂₆(l) + 37 O₂(g) → 24 CO₂(g) + 26 H₂O(g) — hydrocarbon combustion

2.
a. Pb(NO₃)₂(aq) + 2 NaI(aq) → PbI₂(s) + 2 NaNO₃(aq) — double replacement
b. 2 ZnS(s) + 3 O₂(g) → 2 ZnO(s) + 2 SO₂(g) — other (combustion/oxidation)
c. 2 C₄H₁₀(l) + 13 O₂(g) → 8 CO₂(g) + 10 H₂O(g) — hydrocarbon combustion
d. Ba(OH)₂(aq) + 2 HCl(aq) → BaCl₂(aq) + 2 H₂O(l) — double replacement (neutralization)
e. Cu(s) + 2 AgNO₃(aq) → Cu(NO₃)₂(aq) + 2 Ag(s) — single replacement
f. S(s) + O₂(g) → SO₂(g) — formation
g. Al₂(SO₄)₃(aq) + 3 Ca(OH)₂(aq) → 2 Al(OH)₃(s) + 3 CaSO₄(s) — double replacement
h. Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g) — single replacement
i. 2 Al(s) + 3 Cl₂(g) → 2 AlCl₃(s) — formation
j. C₁₂H₂₂O₁₁(s) + 12 O₂(g) → 12 CO₂(g) + 11 H₂O(l) — hydrocarbon combustion