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Return to Statistical Thermodynamics 2e Student Resources
Chapter 15 Multiple choice questions
*
not completed
.
This question examines the link between statistical thermodynamics and chemical kinetics.
The Arrhenius equation for the forwards rate of a reaction is given as
, where
is the activation energy, the energy difference between the reactants and the transition state, which lies on the reaction path between reactants and products.
The equivalent rate for the backwards reaction (i.e. the one converting products back into reactants) is given as
.
The equilibrium constant,
can be viewed as
,
i.e. the ratio of the forward rate of a reaction to its backwards rate.
Which
one
of the following statements is always true?
The constants
A
f
and
A
b
are related to the entropy of the reactants and of the products, respectively.
correct
incorrect
The constants
A
f
and
A
b
are always the same.
correct
incorrect
The ratio of
A
f
and
A
b
is equal to the ratio of the molecular partition functions of reactants to those of products.
correct
incorrect
The ratio of
A
f
to
A
b
is equal to the ratio of the molecular partition functions of products to those of reactants.
correct
incorrect
*
not completed
.
This question explores the relationship between modern statistical thermodynamics and historical principles such as that of Le Chatelier.
All reactions discussed below involve only gaseous participants.
Consider Eq. 15.11:
Which
one
of the following statements is true?
In a reaction of the type A
2
→ 2A the reaction always follows Le Chatelier's principle.
correct
incorrect
In an exothermic reaction of the type A + B → 2C + D, the reaction always follows Le Chatelier's principle
correct
incorrect
In an endothermic reaction of the type A + 2B → C + D, the reaction always follows Le Chatelier's principle.
correct
incorrect
In a thermoneutral reaction of the type A + B → C + D, the reaction always follows Le Chatelier's principle.
correct
incorrect
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