Unit 9 Progress Check AP Chemistry questions and solutions

distribution of molecular speeds in
UNIT 9 PROGRESS CHECK AP each sample. Based on the
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information given, which of the
CHEMISTRY QUESTIONS AND following identifies the sample with
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the greater S°, and why? -
SOLUTIONS answersB
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Sample 1, because the N2N2 ky ky ky ky




molecules have a larger ky ky ky ky




Pacemakers are electronic devices that help regulate the heart rate. distribution of energies compared ky ky ky ky ky ky ky ky ky ky ky ky ky




Currently, lithium-iodine cells are commonly used to power pacemakers and to sample 2.
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have replaced zinc-mercury cells. Table 1 provides the operating cell
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potential, E, for each cell. Table 2 provides the standard reduction potentials A sample of an ideal gas at Pi is
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for several half-reactions related to zinc-mercury and zinc-air cells.
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Based on the information given, which of the following is a major difference
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between the zinc-mercury cell and the lithium-iodine cell? - answersDuring
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the initial cell operation, each reaction is thermodynamically favorable, but the evacuated. The valve connecting
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larger operating potential of the lithium-iodine cell indicates that its cell
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reaction is more thermodynamically favorable.
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temperature to fill both chambers. ky ky ky ky ky




Pacemakers are electronic devices that help regulate the heart rate. Which of the following best ky ky ky ky ky ky ky ky ky ky ky ky ky ky




Currently, lithium-iodine cells are commonly used to power pacemakers and describes ΔS for the process? -
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have replaced zinc-mercury cells. Table 1 provides the operating cell
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potential, E, for each cell. Table 2 provides the standard reduction potentials ΔS=0ΔS=0 because the average
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for several half-reactions related to zinc-mercury and zinc-air cells.
ky ky kinetic energy of the gas particles is
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On average, after one year of operation, the potential of a lithium-iodine cell
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decreases by 1%-2%. Which of the following best helps to explain the cause
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for the decrease in cell potential? - answersD
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Ecell=E°cell−RTnFlnQEcell=E°cell−RTnFlnQ, and as the cell operates, QQ represents the formation of ky ky ky ky ky ky ky ky ky ky




increases.
ky SeF6(g) from its elements and the ky ky ky ky ky ky




table provides the approximate ky ky ky ky




Pacemakers are electronic devices that help regulate the heart rate. values of S° for Se(s) and SeF6(g). ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky




Currently, lithium-iodine cells are commonly used to power pacemakers and Based on the data, which of the
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have replaced zinc-mercury cells. Table 1 provides the operating cell
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potential, E, for each cell. Table 2 provides the standard reduction potentials expressions can be used to
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for several half-reactions related to zinc-mercury and zinc-air cells.
ky ky correctly calculate S° for F2(g) ? -
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The use of zinc-mercury cells in hearing aids has been replaced by zinc-air
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cells that operate using the oxidation of Zn by O2 from the air, generating a
ky ky S°=−13[−337−314+42]J/(mol⋅K)
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potential of +1.60V. Table 2 provides the standard reduction potentials for the
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half-reactions used in zinc-mercury and zinc-air cells. Which of the following The table above provides
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best explains the modification to the cell design that is mostly responsible for approximate S° values for several
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the difference in standard cell potentials for zinc-mercury and zinc-air cells? - substances. Based on the
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answersA
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The greater standard cell potential of the Zn-airZn-air cell compared to that of reactions has the largest increase
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the zinc-mercury cell most likely results from the thermodynamically more
ky ky in entropy, ΔS° ? - answersC ky ky ky ky ky ky ky ky ky ky ky ky ky ky




favorable reduction of O2O2 compared to HgOHgO.
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The diagrams above represent physical changes for potassium. Which of the
ky ky ky ky ky ky ky ky ky ky The chemical equation above
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following correctly identifies the physical process and provides the correct
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ΔS° for the process in the indicated diagram? - answersA
ky ky ky ky ky ky ky ky ky ky glucose, and the table provides the
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In diagram 1, the process is freezing and ΔS°freezingΔS°freezing is negative.
ky ky ky ky ky ky ky ky ky ky approximate standard absolute
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entropies, S°, for some
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Two samples containing an equal number of moles of N2(g) are kept inside
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separate 1-liter rigid containers. The particle diagrams above show the
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