key4(1) - CHEM 1212 Test IV MULTIPLE CHOICE. (3 points...

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CHEM 1212 Test IV MULTIPLE CHOICE. (3 points each) 1) The relationship between the change in Gibbs free energy and the emf of an electrochemical cell is given by __________. A) G = - n F / E R T B ) G = -E/nF C) G = -nRTF D) G = -nF/E E) G = -nFE 2) Which of the following reactions will occur spontaneously as written? A) 3Sn 4+ (aq) + 2Cr (s) Æ 2Cr 3+ (aq) + 3Sn 2+ (aq) B) 3Fe 2+ (aq) Æ Fe (s) + 2Fe 3+ (aq) C) 3Fe (s) + 2Cr 3+ (aq) Æ 2Cr (s) + 3Fe 2+ (aq) D) Sn 4+ (aq) + Fe 3+ (aq) Æ Sn 2+ (aq) + Fe 2+ (aq) E) Sn 4+ (aq) + Fe 2+ (aq) Æ Sn 2+ (aq) + Fe (s) 3) The lead-containing reactant(s) consumed during recharging of a lead-acid battery is/are __________ . A) PbO 2 (s) only B) PbSO 4 (s) only C) Pb (s) only D) both PbO 2 (s) and PbSO 4 (s) E) both Pb (s) and PbO 2 (s) 4) Galvanized iron is iron coated with A) phosphate. B) magnesium. C) iron oxide. D) zinc. E) chromium. 5) Cathodic protection of a metal pipe against corrosion usually entails A) coating the pipe with another metal whose standard reduction potential is less negative than that of the pipe. B) attaching a dry cell to reduce any metal ions which might be formed. C) attaching an active metal to make the pipe the anode in an electrochemical cell. D) coating the pipe with a fluoropolymer to act as a source of fluoride ion (since the latter is so hard to oxidize). E) attaching an active metal to make the pipe the cathode in an electrochemical cell.
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key4(1) - CHEM 1212 Test IV MULTIPLE CHOICE. (3 points...

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