Problem Session

VIII. Chemical Reactions

VIII-I. Balance Chemical Equations

Balance these chemical equations.

(a) Na₂SO₄ (s) + C (s) --> Na₂S (s) + CO₂(g)

(b) Ag₂SO₄ (aq) + BaI₂ (aq) --> BaSO₄ (s) + AgI (s)

(c) HCl (g) + O₂ (g) --> H₂O (l) + Cl₂ (g)

(d) CH₄ (g) + O₂ (g) --> CO₂ (g) + H₂O (l)

(e) Cl₂ (g) + P₄ (s) --> PCl₃ (l)

(f) sodium metal reacts with liquid water produces aqueous sodium hydroxide, NaOH, and hydrogen gas.

(g) Zinc metal dissolves in hydrochloric acid solution, HCl, produces zinc (II) chloride solution and hydrogen gas.

(h) Write the balanced equation for the combustion of benzene, C₆H₆.

(a)	Na₂SO₄ (s) + C (s) --> Na₂S (s) + CO₂(g)
(b)	Ag₂SO₄ (aq) + BaI₂ (aq) --> BaSO₄ (s) + AgI (s)
(c)	HCl (g) + O₂ (g) --> H₂O (l) + Cl₂ (g)
(d)	CH₄ (g) + O₂ (g) --> CO₂ (g) + H₂O (l)
(e)	Cl₂ (g) + P₄ (s) --> PCl₃ (l)
(f)	sodium metal reacts with liquid water produces aqueous sodium hydroxide, NaOH, and hydrogen gas.
(g)	Zinc metal dissolves in hydrochloric acid solution, HCl, produces zinc (II) chloride solution and hydrogen gas.
(h)	Write the balanced equation for the combustion of benzene, C₆H₆.

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Rosamaría Fong, Instructor of Chemistry,
British Columbia Institute of Technology, Burnaby, B.C. Canada.

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