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anskeypracticeexam1

anskeypracticeexam1 - Answers to Practice Exam I 1 B...

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Answers to Practice Exam I: 1) B - Nitrate has N in +5 oxdn state and NO has N in +2, so 3 electrons are transferred. 2) C Hydrogen is oxidized at an inert Pt electrode in a solution containing dissolved HCl for the anode reaction and AgCl is reduced to Ag at the all solid cathode. Note that A is not correct because there is a barrier between the chloride solution around the Pt electrode and the anode reactant H 2 . 3) C From the redox table provided V 3+ /V 2+ is -0.26 standard reduction potential cannot be reduced by Cu Cu 2+ -0.34V, but Br 2 /Br - with a standard reduction potential of + 1.09 will combine to give an overall spontaneous process. 4) E Cr 2+ Cr 3+ + e 0.41V is the most spontaneous oxidation half-reaction, so it is the best reducing agent. 5) E- The cell specifies the two half-reactions: g + Cl - AgCl + e E 1 Cu 2+ + 2e Cu 0.34 Cu 2+ + Ag + Cl - AgCl + Cu 0.12 = 0.34 + E 1 so E 1 = -0.22 Written as a standard reduction potential it would be +0.22 6) Pb + SO 4 2- PbSO 4 + 2e Pb 2+ + 2e Pb Pb 2+ + SO 4 2- PbSO 4 = 1/K sp E o = +0.23
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