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- 1. Multiple ChoiceWhat two factors govern whether a collision between reacting particles will be effective?orientation and potential energykinetic energy and temperaturekinetic energy and orientationpotential energy and kinetic energy
- 2. Multiple ChoiceMore collisions correspond to a:Faster reaction rateSlower reaction rateConstant reaction rateNone of the above
- 3. Multiple ChoiceTo slow down a chemical reaction you will do one of the following:Place the reactants in hot waterPlace the products in ice bathPlace the reactants in a ice bathKeep stirring the reactants with a stirring rod
- 4. Multiple ChoiceWhich of the following increase the reaction rate?less surface arealower temperaturean inhibitorincreased concentration
- 5. 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
- 6. 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-]
- 7. 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
- 8. Multiple Choice
The following data were measured for the reaction
BF3(g) + NH3(g) ⟶ F3BNH3(g)
What is the rate when [BF3] = 0.100 M and [NH3] = 0.500 M ?
.01704 M/s
.0852 M/s
.1704 M/s
.852 M/s
- 9. 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
- 10. Multiple Choice
What letter represents the activation energy?
A
B
C
D
- 11. Multiple Choice
Which of the two graphs show a state of equilibrium being reached?
A
B
A and B
Neither.
- 12. 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
- 13. 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.
- 14. Multiple Choice
rate = k[A]
The rate constant in the rate law above is 0.5 L/mol·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.
- 15. Multiple Choice
Which species is the catalyst in this reaction mechanism?
R
W
X
There is no catalyst.
- 16. 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
- 17. Multiple Choice
Which factors increase the rate of a reaction?
increasing temperature
increasing concentration
increasing surface area
all of the above
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