can be used to correctly calculate
AP CHEMISTRY UNIT 9 ky
ky S° for F2(g) ? - answersD.
ky
ky
ky
ky
ky
ky
ky ky
ky ky
S°=−1/3[−337−314+42]J/(mol⋅K)
PROGRESS CHECK: MCQ ky
The table above provides
QUESTIONS AND SOLUTIONS approximate S° values for several ky
ky ky
ky
ky
ky ky ky
substances. Based on the ky ky ky ky
information, which of the following ky ky ky ky ky
Based on the information given, which of the following is a major differenceky reactions has the largest increase
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
between the zinc-mercury cell and the lithium-iodine cell? - answersB. During in entropy, ΔS° ? - answersA.
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
the initial cell operation, each reaction is thermodynamically favorable, but the 2C(s)+O2(g)→2CO(g)
ky ky ky ky ky ky ky ky ky ky ky ky
larger operating potential of the lithium-iodine cell indicates that its cell
ky ky ky ky ky ky ky ky ky ky ky
reaction is more thermodynamically favorable.
ky The chemical equation above
ky ky ky ky ky ky ky
represents the combustion of ky ky ky ky
On average, after one year of operation, the potential of a lithium-iodine cell
ky glucose, and the table provides the ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
decreases by 1%-2%. Which of the following best helps to explain the cause approximate standard absolute
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
for the decrease in cell potential? - answersD. Ecell=E°cell−RT/nF lnQ, and entropies, S°, for some
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
as the cell operates, Q increases.
ky ky ky substances. Based on the ky ky ky ky ky ky ky
information given, which of these ky ky ky ky ky
The use of zinc-mercury cells in hearing aids has been replaced by zinc-air
ky equations can be used to calculate
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
cells that operate using the oxidation of Zn by O2 from the air, generating a
ky ky an approximation of S° for H2O(g)
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
potential of +1.60V. Table 2 provides the standard reduction potentials for the ? - answersB.
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
half-reactions used in zinc-mercury and zinc-air cells. Which of the following S°=1/6[900+209+(6×205)−(6×21
ky ky ky ky ky ky ky ky ky ky ky ky
best explains the modification to the cell design that is mostly responsible for 4)]J/(mol⋅K)
ky ky ky ky ky ky ky ky ky ky ky ky ky
the difference in standard cell potentials for zinc-mercury and zinc-air cells? -
ky ky ky ky ky ky ky ky ky ky ky ky
answersA. The greater standard cell potential of the Zn-air cell compared to An ice cube at 0°C melts when
ky ky ky ky ky ky ky ky ky ky ky ky
ky ky ky ky ky ky
that of the zinc-mercury cell most likely results from the thermodynamically
ky ky ky
placed inside a room at 22°C ky ky ky ky ky ky ky ky
ky ky ky ky ky ky
more favorable reduction of O2 compared to HgO.
ky ky
(295K). Based on the concepts of ky ky ky ky ky ky
ky ky ky ky ky ky
enthalpy, entropy, and Gibbs free ky ky ky ky ky
The diagrams above represent physical changes for potassium. Which of the energy, which of the following best
ky ky ky ky ky ky ky ky ky ky
ky ky ky ky ky ky
following correctly identifies the physical process and provides the correct
ky
explains why the process is
ky ky ky ky ky ky ky ky ky
ky ky ky ky ky
ΔS° for the process in the indicated diagram? - answersA. In diagram 1, the
ky ky
thermodynamically favorable? -
ky ky ky ky ky ky ky ky ky ky ky ky
ky ky ky
process is freezing and ΔS°freezing is negative.
ky
answersD. Melting ice requires
ky ky ky ky ky ky
ky ky ky ky
energy, ΔH°>0, and ΔS°>0 ky ky ky ky
Two samples containing an equal number of moles of N2(g) are kept inside
ky because the motion of the H2O ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
separate 1-liter rigid containers. The particle diagrams above show the
ky molecules increases as it
ky ky ky ky ky ky ky ky ky ky ky ky ky
distribution of molecular speeds in each sample. Based on the information
ky transitions from solid to liquid. At a ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
given, which of the following identifies the sample with the greater S°, and
ky ky temperature higher than 0°C ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
why? - answersB. Sample 1, because the N2 molecules have a larger
ky ky ky(273K), the term TΔS° is greater ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
distribution of energies compared to sample 2.
ky than ΔH°, resulting in a ky ky ky ky ky ky ky ky ky ky ky
thermodynamically favorable ky ky
A sample of an ideal gas at Pi is initially confined to one chamber of the
ky process with ΔG°<0. ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
apparatus represented above, and the other chamber is initially evacuated.
ky ky ky ky ky ky ky ky ky ky
The valve connecting the chambers is opened, and the gas expands at
ky ky A 5.00g-sample of KOH(s) at ky ky ky ky ky ky ky ky ky ky ky ky ky ky
constant temperature to fill both chambers. Which of the following best
ky 25.0°C was added to 100.0g of
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
describes ΔS for the process? - answersD. ΔS>0 because the gas particles H2O(l) at room temperature inside
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
become dispersed in a larger volume
ky an insulated cup calorimeter, and
ky ky ky ky ky ky ky ky ky ky
the contents were stirred. After all ky ky ky ky ky ky
The chemical equation above represents the formation of SeF6(g) from its
ky the KOH(s) dissolved, the ky ky ky ky ky ky ky ky ky ky ky ky ky
elements and the table provides the approximate values of S° for Se(s) and
ky temperature of the solution had
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
SeF6(g). Based on the data, which of the following mathematical expressions increased. Based on the
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
information given, which of the ky ky ky ky ky
AP CHEMISTRY UNIT 9 ky
ky S° for F2(g) ? - answersD.
ky
ky
ky
ky
ky
ky
ky ky
ky ky
S°=−1/3[−337−314+42]J/(mol⋅K)
PROGRESS CHECK: MCQ ky
The table above provides
QUESTIONS AND SOLUTIONS approximate S° values for several ky
ky ky
ky
ky
ky ky ky
substances. Based on the ky ky ky ky
information, which of the following ky ky ky ky ky
Based on the information given, which of the following is a major differenceky reactions has the largest increase
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
between the zinc-mercury cell and the lithium-iodine cell? - answersB. During in entropy, ΔS° ? - answersA.
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
the initial cell operation, each reaction is thermodynamically favorable, but the 2C(s)+O2(g)→2CO(g)
ky ky ky ky ky ky ky ky ky ky ky ky
larger operating potential of the lithium-iodine cell indicates that its cell
ky ky ky ky ky ky ky ky ky ky ky
reaction is more thermodynamically favorable.
ky The chemical equation above
ky ky ky ky ky ky ky
represents the combustion of ky ky ky ky
On average, after one year of operation, the potential of a lithium-iodine cell
ky glucose, and the table provides the ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
decreases by 1%-2%. Which of the following best helps to explain the cause approximate standard absolute
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
for the decrease in cell potential? - answersD. Ecell=E°cell−RT/nF lnQ, and entropies, S°, for some
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
as the cell operates, Q increases.
ky ky ky substances. Based on the ky ky ky ky ky ky ky
information given, which of these ky ky ky ky ky
The use of zinc-mercury cells in hearing aids has been replaced by zinc-air
ky equations can be used to calculate
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
cells that operate using the oxidation of Zn by O2 from the air, generating a
ky ky an approximation of S° for H2O(g)
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
potential of +1.60V. Table 2 provides the standard reduction potentials for the ? - answersB.
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
half-reactions used in zinc-mercury and zinc-air cells. Which of the following S°=1/6[900+209+(6×205)−(6×21
ky ky ky ky ky ky ky ky ky ky ky ky
best explains the modification to the cell design that is mostly responsible for 4)]J/(mol⋅K)
ky ky ky ky ky ky ky ky ky ky ky ky ky
the difference in standard cell potentials for zinc-mercury and zinc-air cells? -
ky ky ky ky ky ky ky ky ky ky ky ky
answersA. The greater standard cell potential of the Zn-air cell compared to An ice cube at 0°C melts when
ky ky ky ky ky ky ky ky ky ky ky ky
ky ky ky ky ky ky
that of the zinc-mercury cell most likely results from the thermodynamically
ky ky ky
placed inside a room at 22°C ky ky ky ky ky ky ky ky
ky ky ky ky ky ky
more favorable reduction of O2 compared to HgO.
ky ky
(295K). Based on the concepts of ky ky ky ky ky ky
ky ky ky ky ky ky
enthalpy, entropy, and Gibbs free ky ky ky ky ky
The diagrams above represent physical changes for potassium. Which of the energy, which of the following best
ky ky ky ky ky ky ky ky ky ky
ky ky ky ky ky ky
following correctly identifies the physical process and provides the correct
ky
explains why the process is
ky ky ky ky ky ky ky ky ky
ky ky ky ky ky
ΔS° for the process in the indicated diagram? - answersA. In diagram 1, the
ky ky
thermodynamically favorable? -
ky ky ky ky ky ky ky ky ky ky ky ky
ky ky ky
process is freezing and ΔS°freezing is negative.
ky
answersD. Melting ice requires
ky ky ky ky ky ky
ky ky ky ky
energy, ΔH°>0, and ΔS°>0 ky ky ky ky
Two samples containing an equal number of moles of N2(g) are kept inside
ky because the motion of the H2O ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
separate 1-liter rigid containers. The particle diagrams above show the
ky molecules increases as it
ky ky ky ky ky ky ky ky ky ky ky ky ky
distribution of molecular speeds in each sample. Based on the information
ky transitions from solid to liquid. At a ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
given, which of the following identifies the sample with the greater S°, and
ky ky temperature higher than 0°C ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
why? - answersB. Sample 1, because the N2 molecules have a larger
ky ky ky(273K), the term TΔS° is greater ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
distribution of energies compared to sample 2.
ky than ΔH°, resulting in a ky ky ky ky ky ky ky ky ky ky ky
thermodynamically favorable ky ky
A sample of an ideal gas at Pi is initially confined to one chamber of the
ky process with ΔG°<0. ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
apparatus represented above, and the other chamber is initially evacuated.
ky ky ky ky ky ky ky ky ky ky
The valve connecting the chambers is opened, and the gas expands at
ky ky A 5.00g-sample of KOH(s) at ky ky ky ky ky ky ky ky ky ky ky ky ky ky
constant temperature to fill both chambers. Which of the following best
ky 25.0°C was added to 100.0g of
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
describes ΔS for the process? - answersD. ΔS>0 because the gas particles H2O(l) at room temperature inside
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
become dispersed in a larger volume
ky an insulated cup calorimeter, and
ky ky ky ky ky ky ky ky ky ky
the contents were stirred. After all ky ky ky ky ky ky
The chemical equation above represents the formation of SeF6(g) from its
ky the KOH(s) dissolved, the ky ky ky ky ky ky ky ky ky ky ky ky ky
elements and the table provides the approximate values of S° for Se(s) and
ky temperature of the solution had
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
SeF6(g). Based on the data, which of the following mathematical expressions increased. Based on the
ky ky ky ky ky ky ky ky ky ky ky ky ky ky ky
information given, which of the ky ky ky ky ky
