topic15 - XV. Electrochemistry, Redox Use the following...

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XV. Electrochemistry, Redox Use the following answers for questions 1 – 4 (A) voltage increases (B) voltage decreases but remains above zero (C) voltage becomes zero and remains at zero (D) no change in voltage occurs (E) Direction of voltage change cannot be predicted without additional information A voltaic cell using the following reaction is in operation: 2 Ag + (lM) + Cd(s) 2 Ag(s) + Cd 2+ (l M) 1. A 50-ml sample of 2-molar Cd(NO 3 ) 2 solution is added to the Cd(NO 3 ) 2 beaker. Answer: B 2. The silver electrode is made larger. Answer: D 3. The salt bridge is replaced by a platinum wire. Answer: C 4. Current is allowed to flow for 5 minutes. Answer: B 5. Mg + NO 3 - + H + Mg 2+ + NH 4 + + H 2 O When the skeleton equation above is balanced and all coefficients reduced to their lowest whole-number terms, what is the coefficient for H + ? (A) 4 (B) 6 (C) 8 (D) 9 (E) 10 Answer: E 6. CrO 2 - + OH - CrO 4 2- + H 2 O + e - When the equation for the half-reaction above is balanced, what is the ratio Of the coefficients OH - /CrO 2 - ? (A) 1:1 (B) 2:1 (C) 3:1 (D) 4:1 (E) 5:1 Answer: D 7. If 0.060 faraday is passed through an electrolytic cell containing a solution of In 3+ ions, the maximum number of moles of In that could be deposited at the cathode is: (A) 0.01 mole (B) 0.02 mole (C) 0.03 mole (D) 0.06 mole (E) 0.18 mole Answer: B 8. Which of the following species cannot function as an oxidizing agent? (A) Cr 2 O 7 2- (B) MnO 4 - (C) NO 3 - (D) S (E) I - Answer: E
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9. 6 I - + 2 MnO 4 - + 4 H 2 O 3 I 2 + 2 MnO 2 + 8 OH - Which of the following statements regarding the reaction represented by the above equation is correct? (A) Iodide ion is oxidized by hydroxide ion (B) MnO 4 - is oxidized by iodide ion (C) The oxidation number of manganese changes from +7 to +2 (D) The oxidation number of manganese remains the same (E) The oxidation number of iodine changes from –1 to 0 Answer: E 10. Cr 2 O 7
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This note was uploaded on 01/03/2011 for the course CHEM 1442 taught by Professor Rogers during the Spring '08 term at UT Arlington.

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topic15 - XV. Electrochemistry, Redox Use the following...

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