CH 17 Chemical Equilibrium

Question 1

True or False: Chemical equilibrium is a dynamic state because reactions continue to occur, but because they occur at the same rate, no net change is observed on the macroscopic level.

Answer 1

True: Rate of reaction (fwd) = rate of reaction (rev)

Question 2

What is the equilibrium constant for the following reaction?

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Question 3

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Question 4

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Question 5

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Question 6

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Question 7

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Question 8

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Question 9

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Question 10

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Question 11

True or False: Only substances that appear in the expression for Q can have an effect.

Answer 11

True

Question 12

True or False: A change in concentration will effect the value of K proportionally.

Answer 12

False A change in concentration has no effect on the value of K

Question 13

True or False: Changes in pressure have no effect on the value of K

Answer 13

True

Question 14

True or False: Adding an inert gas has no effect on the equilibrium position.

Answer 14

True: Adding an inert gas has no effect on the equilibrium position, as long as the volume does not change.

Question 15

Answer 15

AB + heat -> A + B Reaction is endergonic so adding heat on the left side of the reaction will cause it to shift to the right to maintain equilibrium.

Question 16

Answer 16

A + B -> AB + heat (Exothermic)
Adding heat will cause the reaction to shift to the left

Question 17

van’t Hoff equation

Answer 17

Question 18

True or False: a catalyst only increases the rate of the forward reaction.

Answer 18

False: A catalyst speeds up a reaction by lowering its activation energy. It therefore speeds up the forward and
reverse reactions to the same extent.

Question 19

True or False: A catalyst causes a reaction to reach equilibrium more quickly, and can shift the equilibrium position proportionally.

Answer 19

False: A catalyst causes a reaction to reach equilibrium more quickly, but has no effect on the equilibrium position.

Question 20

In a system in which n changes, reducing Volume (increasing P) will:

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Question 21

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Question 22

Relation of Gibb’s Free Energy to Keq

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Question 23

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Question 24

`

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Question 25

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Question 26

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Question 27

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Question 28

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Question 29

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Question 30

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Question 31

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