CHM1046
Advanced Chemistry
Q & A w/ Rationales
2024
,1. Which of the following statements is true about the
relationship between entropy and Gibbs free energy?
a) Entropy is the measure of disorder in a system, and
Gibbs free energy is the measure of the maximum amount
of work that can be done by a system at constant
temperature and pressure.
b) Entropy is the measure of the spontaneity of a process,
and Gibbs free energy is the measure of the change in
enthalpy minus the change in entropy multiplied by the
temperature.
c) Entropy is the measure of the heat transfer in a reversible
process, and Gibbs free energy is the measure of the
change in entropy minus the change in enthalpy divided by
the temperature.
d) Entropy is the measure of the randomness of a system,
and Gibbs free energy is the measure of the tendency of a
system to change to a lower energy state. *
Rationale: Option d) is correct because entropy is a
measure of how dispersed or random the energy of a
system is, and Gibbs free energy is a measure of how likely
a system will undergo a spontaneous change to a more
stable state. Option a) is incorrect because entropy is not
directly related to work, but rather to heat transfer. Option
b) is incorrect because it confuses the definitions of entropy
and Gibbs free energy. Option c) is incorrect because it
reverses the signs of enthalpy and entropy in the formula
for Gibbs free energy.
, 2. What is the effect of adding a catalyst to a chemical
reaction?
a) It increases the rate of the reaction by lowering the
activation energy. *
b) It increases the rate of the reaction by increasing the
concentration of reactants.
c) It decreases the rate of the reaction by lowering the
activation energy.
d) It decreases the rate of the reaction by increasing the
concentration of products.
Rationale: Option a) is correct because a catalyst provides
an alternative pathway for the reaction that has a lower
activation energy, which means that more molecules can
overcome this barrier and react faster. Option b) is
incorrect because a catalyst does not affect the
concentration of reactants or products, but only changes
their rate of conversion. Option c) is incorrect because
lowering the activation energy increases, not decreases, the
rate of reaction. Option d) is incorrect because increasing
the concentration of products would shift the equilibrium to
favor reactants, not increase the rate of reaction.
3. What is the difference between an acid-base reaction and
a redox reaction?
a) An acid-base reaction involves the transfer of protons,
while a redox reaction involves the transfer of electrons. *
b) An acid-base reaction involves the transfer of electrons,
while a redox reaction involves the transfer of protons.
c) An acid-base reaction involves the change in oxidation
state, while a redox reaction involves
Advanced Chemistry
Q & A w/ Rationales
2024
,1. Which of the following statements is true about the
relationship between entropy and Gibbs free energy?
a) Entropy is the measure of disorder in a system, and
Gibbs free energy is the measure of the maximum amount
of work that can be done by a system at constant
temperature and pressure.
b) Entropy is the measure of the spontaneity of a process,
and Gibbs free energy is the measure of the change in
enthalpy minus the change in entropy multiplied by the
temperature.
c) Entropy is the measure of the heat transfer in a reversible
process, and Gibbs free energy is the measure of the
change in entropy minus the change in enthalpy divided by
the temperature.
d) Entropy is the measure of the randomness of a system,
and Gibbs free energy is the measure of the tendency of a
system to change to a lower energy state. *
Rationale: Option d) is correct because entropy is a
measure of how dispersed or random the energy of a
system is, and Gibbs free energy is a measure of how likely
a system will undergo a spontaneous change to a more
stable state. Option a) is incorrect because entropy is not
directly related to work, but rather to heat transfer. Option
b) is incorrect because it confuses the definitions of entropy
and Gibbs free energy. Option c) is incorrect because it
reverses the signs of enthalpy and entropy in the formula
for Gibbs free energy.
, 2. What is the effect of adding a catalyst to a chemical
reaction?
a) It increases the rate of the reaction by lowering the
activation energy. *
b) It increases the rate of the reaction by increasing the
concentration of reactants.
c) It decreases the rate of the reaction by lowering the
activation energy.
d) It decreases the rate of the reaction by increasing the
concentration of products.
Rationale: Option a) is correct because a catalyst provides
an alternative pathway for the reaction that has a lower
activation energy, which means that more molecules can
overcome this barrier and react faster. Option b) is
incorrect because a catalyst does not affect the
concentration of reactants or products, but only changes
their rate of conversion. Option c) is incorrect because
lowering the activation energy increases, not decreases, the
rate of reaction. Option d) is incorrect because increasing
the concentration of products would shift the equilibrium to
favor reactants, not increase the rate of reaction.
3. What is the difference between an acid-base reaction and
a redox reaction?
a) An acid-base reaction involves the transfer of protons,
while a redox reaction involves the transfer of electrons. *
b) An acid-base reaction involves the transfer of electrons,
while a redox reaction involves the transfer of protons.
c) An acid-base reaction involves the change in oxidation
state, while a redox reaction involves
