Practice Questions
|
Use the following
diagram to answer questions 1–3:
 |
| 1. |
Which letter corresponds to the
activation energy of the reaction? |
| (A) |
A |
| (B) |
B |
| (C) |
C |
| (D) |
Y |
| (E) |
X |
|
|
| 2. |
Which letter
corresponds to the change in energy for the overall reaction? |
| (A) |
A |
| (B) |
B |
| (C) |
C |
| (D) |
Y |
| (E) |
X |
|
|
Statement I |
| Statement
II |
| 3. |
The reaction shown above is exothermic. |
BECAUSE | Energy difference B is
greater than energy difference A. |
| 4. |
A system is at equilibrium when the rate
of the forward reaction is equal to the rate of the reverse reactions. |
BECAUSE | At equilibrium,
the concentration of the products is equal to that of the reactants. |
|
|
| 5. |
Which
of the following statements best describes the condition(s) needed
for a successful formation of a product in a chemical reaction? |
| (A) |
The collision must involve a sufficient amount of energy,
provided from the motion of the particles, to overcome the activation
energy. |
| (B) |
The relative orientation of the particles has little or
no effect on the formation of the product. |
| (C) |
The relative orientation of the particles has an effect
only if the kinetic energy of the particles is below some minimum
value. |
| (D) |
The relative orientation of the particles must allow for
formation of the new bonds in the product. |
| (E) |
The energy of the incoming particles must be above a certain
minimum value and the relative orientation of the particles must
allow for formation of new bonds in the product. |
|
|
| 6. |
The catalyzed
pathway in a reaction mechanism has a _____ activation energy and
thus causes a _____ reaction rate. |
| (A) |
higher, lower |
| (B) |
higher, higher |
| (C) |
lower, higher |
| (D) |
lower, steady |
| (E) |
higher, steady |
|
|
|
| 7. |
Write
the equilibrium expression for the following reaction: |
|
|
| (A) |
[A]2[B][D] |
| (B) |
 |
| (C) |
 |
| (D) |
 |
| (E) |
 |
|
|
| 8. |
If at a
given temperature the equilibrium constant for the reaction is Kp,
the equilibrium constant for the reaction can be represented as |
| (A) |
 |
| (B) |
 |
| (C) |
 |
| (D) |
 |
| (E) |
 |
|
|
| 9. |
The value
of the equilibrium constant, K, is dependent on |
|
I. The temperature of the system
II. The concentration of the reactants
III. The concentration of the products
IV. The nature of the reactants and products
|
| (A) |
I, II |
| (B) |
II, III |
| (C) |
III, IV |
| (D) |
I and IV |
| (E) |
I, II, and IV |
|
|
|
| 10. |
Consider
the system below at equilibrium. Which of the following changes
will shift the equilibrium to the right? |
|
I. Increasing the temperature
II. Decreasing the temperature
III. Increasing the pressure on the system
|
| (A) |
I only |
| (B) |
II only |
| (C) |
III only |
| (D) |
I and III |
| (E) |
II and III |
|
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