A apclassroom.collegeboard.orgXCollegeBoardAP ClassroomO LOW BATTERYUnit 9 Progress Check: MCQYour Mac will sleep soon unless plugged inpower outlet.A UPDATES AVAILABLEDo you want to install the updates now?Table 2Half-ReactionStandard Reduction Potential, E' (V)[Zn(OH),]?- + 2 e- → Zn + 4 OH--1.20Zn(OH), + 2e-→ Zn + 2 OH-1.25HgO + H2O + 2 e¯→ Hg + 2OH+0.10O2 + 2 H20+4 e → 4 OH+0.40Pacemakers 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 operatingcell potential, E, for each cell. Table 2 provides the standard reduction potentials for several half-reactions related to zinc-mercury and zinc-air cells.The use of zinc-mercury cells in hearing aids has been replaced by zinc-air cells that operate using the oxidation of Zn by O, from the air, generating a potential of +1.60 V. Table 2 provides the standardreduction potentials for the half-reactions used in zinc-mercury and zinc-air cells. Which of the following best explains the modification to the cell design that is mostly responsible for the difference in standardcell potentials for zinc-mercury and zinc-air cells?The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the thermodynamically more favorable reduction of O, compared toAHgO.The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the greater number of moles of e required to reduce O, compared toBHgO.The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the thermodynamically less favorable reduction of Oz compared toHgO.The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the greater number of moles of hydroxide ions required to reduceD[Zn(OH),]- compared to Zn(OH),. apclassroom.collegeboard.org| LOW BATTERYCollegeBoardAP ClassroomUnit 9 Progress Check: MCQYour Mac will sleep soon unless pluggedpower outlet.1112A UPDATES AVAILABLE21Do you want to install the updates now?Cell TypeOperating CelI Potential for Commercial Batteries, E (V)Lithium-iodine+2.80Zinc-mercury+1.35Table 2Half-ReactionStandard Reduction Potential, E (V)[Zn(OH),] + 2 e → Zn + 4 OH-1.20Zn(OH), + 2e → Zn + 2 OH-1.25HgO + H2O + 2 e¯ → Hg + 2 OH+0.10O2 + 2 H20 + 4 e¯ → 4 OH+0.40Pacemakers 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 operatingcell potential, E, for each cell. Table 2 provides the standard reduction potentials for several half-reactions related to zinc-mercury and zinc-air cells.The use of zinc-mercury cells in hearing aids has been replaced by zinc-air cells that operate using the oxidation of Zn by O, from the air, generating a potential of +1.60 V. Table 2 provides the standardreduction potentials for the half-reactions used in zinc-mercury and zinc-air cells. Which of the following best explains the modification to the cell design that is mostly responsible for the difference in standardcell potentials for zinc-mercury and zinc-air cells?The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the thermodynamically more favorable reduction of O, compared toHgO.The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the greater number of moles of e required to reduce O, compared toHgO.The greater standard cell potential of the Zn-air cell compared to that of the zinc-mercury cell most likely results from the thermodynamically less favorable reduction of O, compared toHgO.

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