E10+FinalExam_2MSE+Module2008_

# E10+FinalExam_2MSE+Module2008_ - E10 Final Exam MSE Module...

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E10 Final Exam MSE Module Batteries, Fuel Cells, Solar Cells NAME:____________________________________________________________ This is a closed book exam. All work is to be presented on the exam’s pages. If necessary, you may use the backs of pages. In most cases I have estimated that the correct answer can be fitted into the space provided. UNITS: Charge of one electron = 1.602x10 -19 coulomb 1 electronVolt (eV) = 1.602x10 -19 joule = 1.602x10 -19 volt-coulomb 1 cal = 4.19 joules F ≈ 96,500 coul/equiv Problem No. Point Value 1 35 2 15 3 15 4 35 1

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1. This problem considers the Zinc-Air battery, which was described in lecture and was investigated in the laboratory. The electrolyte is an aqueous, alkaline solution of KOH that is air-saturated. One electrode is made of zinc and the other electrode consists of graphite. (a) Identify the oxidation and reduction reactions that occur on the surface of zinc for the case in which the zinc is not connected to the graphite electrode. (b) Sketch the rates (current, I) of the oxidation and reduction reactions that
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