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Review Sheets for Chapter 20. 1 1. Assuming the following reaction proceeds in the forward direction, 3 Sn4+(aq) + 2 Cr(s) ? 3 Sn2+(aq) + 2 Cr3+(aq) 4+ a. We will write a custom essay sample on Any Help or any similar topic only for you Order Now Sn (aq) is the reducing agent and Cr(s) is the oxidizing agent. b. Cr(s) is the reducing agent and Sn2+(aq) is the oxidizing agent. c. Sn4+(aq) is the reducing agent and Sn2+(aq) is the oxidizing agent. d. Cr(s) is the reducing agent and Cr3+(aq) is the oxidizing agent. e. Cr(s) is the reducing agent and Sn4+(aq) is the oxidizing agent. 2. The following reaction occurs spontaneously. H+(aq) + Ca(s) ? Ca2+(aq) + H2(g) Write the balanced oxidation half-reaction. a. 2 H+(aq) + 2 e– ? H2(g) b. 2 H+(aq) ? H2(g) + 2 e– c. H2(g) ? 2 H+(aq) + 2 e– d. Ca(s) + 2 e– ? Ca2+(aq) e. Ca(s) ? Ca2+(aq) + 2 e– 3. Write a balanced half-reaction for the reduction of CrO42–(aq) to Cr(OH)3(s) in a basic solution. a. CrO42–(aq) + 3 OH–(aq) + 3 e– ? Cr(OH)3(s) + 2 O2(g) b. CrO42–(aq) + 3 H+(aq) + 3 e– ? Cr(OH)3(s) c. CrO42–(aq) + 3 H+(aq) ? Cr(OH)3(s) + 2 e– d. CrO42–(aq) + 4 H2O( ) + 3 e– ? Cr(OH)3(s) + 5 OH–(aq) e. CrO42–(aq) + 3 OH–(aq) ? Cr(OH)3(s) + 2 O2(g) 4. Write a balanced chemical equation for the oxidation of Cd(s) by concentrated nitric acid, producing NO2(g) and Cd2+(aq). a. HNO3(aq) + Cd(s) ? Cd2+(aq) + NO2(g) + OH–(aq) b. 2 HNO3(aq) + Cd(s) ? Cd2+(aq) + 2 NO2(g) + 2 OH–(aq) c. HNO3(aq) + Cd(s) + H+(aq) ? Cd2+(aq) + NO2(g) + H2O( ) d. 4 HNO3(aq) + Cd(s) ? Cd2+(aq) + 2 NO2(g) + 2H2O( ) + 2 NO3–(aq) e. HNO3(aq) + Cd(s) ? Cd2+(aq) + NO2(g) Answer Section MULTIPLE CHOICE 1. 2. 3. 4. ANS: ANS: ANS: ANS: E E D D How to cite Any Help, Essay examples