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- 1. Multiple Choice
Which of the following plots will show a linear relationship for a second order reaction?
[A] vs time
1/[A] vs time
ln[A] vs time
[A]2 vs time
- 2. Multiple Choice
The iodide ion reacts with hypochlorite ion in the following way:
OCl- + I- ⟶ OI- + Cl-.
This rapid reaction gives the rate data shown. What is the rate law?
rate = [OCl-]2[I-]
rate = [OCl-][I-]2
rate = [OCl-][I-]
rate = [OCl-]
- 3. Multiple Choice
The following data were measured for the reaction
BF3(g) + NH3(g) ⟶ F3BNH3(g)
What is the rate law for the reaction?
rate = k[NH3]
rate = k[BF3]2[NH3]
rate = k[BF3][NH3]
rate = k[BF3][NH3]2
- 4. Multiple Choice
A reaction is found to be second order with respect to carbon monoxide. If the concentration of carbon monoxide is doubled, the rate of reaction __________.
doubles
remains unchanged
increases by a factor of 4
is reduced by a factor of 2
- 5. Multiple Choice
What letter represents the activation energy?
A
B
C
D
- 6. Multiple Choice
Which of the two graphs show a state of equilibrium being reached?
A
B
A and B
Neither.
- 7. Multiple Choice
Given the following rate law,
rate = k[A]2[B]
if [A] were doubled, what must happen to [B] to keep the rate constant?
[B] must quadruple
[B] must double
[B] must be havled
[B] must be quartered
- 8. Multiple Choice
Which of the following best describes why increasing temperature increase reaction rate?
Activation energy is reduced.
Collisions become more frequent.
Collisions become more energetic.
Collisions become more frequent and more energetic.
- 9. Multiple Choice
rate = k[A]
The rate constant in the rate law above is 0.5 1/s. If the initial concentration of A is 0.1 M, how long will it take for [A] to drop to 0.025 M?
0.7 s
1.4 s
2.8 s
There is not enough information given.
- 10. Multiple Choice
Which species is the catalyst in this reaction mechanism?
R
W
X
There is no catalyst.
- 11. Multiple Choice
What is the rate law for this mechanism?
rate = k[A][B]2
rate = [B][X]
rate = [A]0.5[B]1.5
rate = [W][Y][Z]
- 12. Multiple Choice
The addition of a catalyst to this reaction would cause a change in which of the indicated energy differences?
I
II
III
I and II
- 13. Multiple Choice
Which factors increase the rate of a reaction?
increasing temperature
increasing concentration
increasing surface area
all of the above
- 14. Multiple Choice
Consider the reaction coordinate diagram. Which of the following is true?
The reaction occurs in two elementary steps. The first is the rate-determining step.
The reaction occurs in two elementary steps. The second is the rate-determining step.
The reaction occurs in three elementary steps. The first is the rate-determining step.
The reaction occurs in three elementary steps. The second is the rate-determining step
- 15. Multiple Choice
Identify the enthalpy change for the overall reaction.
1
2
3
4
6
- 16. Multiple Choice
Identify the activation energy for the overall reaction.
1
2
3
4
5
- 17. Multiple Choice
The radioactive decay of Ra-226 follows first-order kinetics and has a half-life of 1600 years. How long does it take for 10% of a sample of RA-226 to decay?
80 yr
160 yr
240 yr
5300 yr
- 18. Multiple Choice
X → Y + Z
The first-order decomposition of X has a rate constant of 2.5×10-2 s-1. If [X] is 0.005 M after 200 seconds, what was the initial concentration of X?
0.18 M
0.35 M
0.7 M
1.4 M
- 19. Multiple Choice
For a certain reaction the rate law is
rate=k[NO]2When the concentration of NO is tripled, the rate will...
Decreases by a factor of nine
Increase by a factor of six
Increase by a factor of nine
Decreases by a factor of six
- 20. Multiple Choice
Some bird species, including crows, are capable of tool use. One of Mr. Walsh's favorite birds will often engage in bait-fishing by placing bread, insects, or feathers on the surface of the water to lure fish. Which bird is this?
Great Cormorant
Osprey
Green Heron
Sandhill Crane
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