COSTAATT CHEM 092 ANSWERS - Revision Worksheet Unit 3: Chemical Reactions – Lecturer: Ms. Romona Olton Student Name:______________________________________ SECTION A Multiple Choice – 1. The equation below represents the reaction of sodium metal with water. Sodium + Water Sodium hydroxide + Hydrogen  Which of the following chemical equations represents a complete balanced chemical equation for the given word equation? (A) 2Na(s) + H2O(l)  2NaOH(aq) + H2(g) (B) Na(s) + 2H2O(l)  NaOH(aq) +2H2(g) (C) 2Na(s) + 2H3O(l) 2NaOH(aq) + 2H2(g)  (D) 2Na(s) + 2H2O(l) + H2(g)  2. Identify the chemical equation which represents a complete balanced equation for the reaction of barium chloride with sodium sulphate to produce barium sulphate and sodium chloride. (A) BaCl2(aq) + Na2SO4(aq) BaSO4(s) + 2NaCl(aq)  (B) BaCl2(aq) + Na2SO4(aq) 2BaSO4(s) + 2NaCl(aq)  (C) 2BaCl2(aq) + Na2SO4(aq) 2BaSO4(s) + NaCl(aq)  (D) BaCl2(aq) + Na2SO4(aq) BaSO4(s) + NaCl(aq)  3. Ferric oxide reacts with aluminum to produce aluminum oxide and iron. The balanced chemical equation for the given reaction is: Fe2O3 + 2Al Al2O3 + 2Fe  Which of the following substances is oxidized in the given reaction? (A) Al2O3 (B) Fe2O3 (D) Fe (C) Al
COSTAATT CHEM 092 ANSWERS - Revision Worksheet – Unit 3: Chemical Reactions Lecturer: Ms. Romona Olton Student Name:______________________________________ SECTION A – Multiple Choice 1. The equation below represents the reaction of sodium metal with water. Sodium + Water  Sodium hydroxide + Hydrogen Which of the following chemical equations represents a complete balanced chemical equation for the given word equation? (A) 2Na(s) + H2O(l)  2NaOH(aq) + H2(g) (B) Na(s) + 2H2O(l)  NaOH(aq) +2H2(g) (C) 2Na(s) + 2H3O(l)  2NaOH(aq) + 2H2(g) (D) 2Na(s) + 2H2O(l)  + H2(g) 2. Identify the chemical equation which represents a complete balanced equation for the reaction of barium chloride with sodium sulphate to produce barium sulphate and sodium chloride. (A) BaCl2(aq) + Na2SO4(aq)  BaSO4(s) + 2NaCl(aq) (B) BaCl2(aq) + Na2SO4(aq)  2BaSO4(s) + 2NaCl(aq) (C) 2BaCl2(aq) + Na2SO4(aq)  2BaSO4(s) + NaCl(aq) (D) BaCl2(aq) + Na2SO4(aq)  BaSO4(s) + NaCl(aq) 3. Ferric oxide reacts with aluminum to produce aluminum oxide and iron. The balanced chemical equation for the given reaction is: Fe2O3 + 2Al  Al2O3 + 2Fe Which of the following substances is oxidized in the given reaction? (A) Al2O3 (B) Fe2O3 (C) Al (D) Fe