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Texas State UniversityCHEMISTRY 1310ChemTaylor2

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Unit 9 Progress Check: MCQ Copyright © 2020. The College Board. These materials are part of a College Board program. Use or distribution of these materials online or in print beyond your school’s ... participation in the program is prohibited. Page 1 of 21 Table 1 Cell Type Operating Cell Potential for Commercial Batteries, Lithium-iodine Zinc-mercury Table 2 Half-Reaction Standard Reduction Potential, Pacemakers are electronic devices that help regulate the heart rate. Currently, lithium-iodine cells are commonly used to power pacemakers and have replaced zinc-mercury cells. Table 1 provides the operating cell potential, , for each cell. Table 2 provides the standard reduction potentials for several half-reactions related to zinc-mercury and zinc-air cells. 1. Based on the information given, which of the following is a major difference between the zinc-mercury cell and the lithium-iodine cell? A During the initial cell operation, each reaction is thermodynamically favorable, but the larger operating potential of the lithium-iodine cell indicates that its cell reaction is less thermodynamically favorable. B During the initial cell operation, each reaction is thermodynamically favorable, but the larger operating potential of the lithium-iodine cell indicates that its cell reaction is more thermodynamically favorable. C During the initial cell operation, the oxidation of iodine is thermodynamically favorable but the oxidation of mercury is not. D During the initial cell operation, the oxidation of mercury is thermodynamically favorable but not the oxidation of iodine is not.AP Chemistry Scoring Guide Unit 9 Progress Check: MCQ Copyright © 2020. The College Board. These materials are part of a College Board program. Use or distribution of these materials online or in print beyond your school’s participation in the program is prohibited. Page 2 of 21 2. On average, after one year of operation, the potential of a lithium-iodine cell decreases by 1%-2%. Which of the following best helps to explain the cause for the decrease in cell potential? A , and as the cell operates, decreases. B , and as the cell operates, increases. C , and as the cell operates, decreases. D , and as the cell operates, increases. [Show More]

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