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Unit 11 - Final Exam Review
Test Description: Kinetics Review
Instructions: Answer all questions to get your test result.
1) Which action will slow down the reaction between Mg metal and HCl?
A
Add a catalyst to the mixture.
B
Decrease the temperature of the HCl solution.
C
Increase the molarity of the HCl solution.
D
Crush the magnesium into a powder.
2) 2 H2 + O2 = 2 H2O If the rate of disappearance of H2 is 0.250 M/s, what is the rate of disappearance of O2?
A
0.375 M/s
B
0.125 M/s
C
0.500 M/s
D
0.250 M/s
3) Which reaction is 2nd order overall?
A
rate = k |A|^3
B
rate = k |A| |B|
C
rate = k |A|^2 |B|
D
rate = k |A| |B| |C|
4) In which reaction would the rate quadruple if the concentration of A is doubled?
A
rate = k |A|^3
B
rate = k |A| |B| |C|
C
rate = k |A| |B|
D
rate = k |A|^2 |B|
5) Which of the following could be units for a second order reaction?
A
M-1 s-1
B
M/s
C
M2 s-1
D
M-2 s-1
6) Which plot vs time will yield a straight line for a second order reaction?
A
1/|A|
B
|A|^2
C
|A|
D
ln|A|
7) Which type of reaction will have a value of half life which is independent of reactant concentration?
A
Zero
B
Second
C
Third
D
First
8) A rate constant can be determined graphically for a first order reaction by:
A
Finding the slope of ln|A| vs time
B
Any of the above.
C
Using the following integrated rate law: 1/|A|t = -kt + 1/|A|o
D
Finding the slope of |A| vs time
9) Reaction rate increases with an increase in temperature because:
A
The particles collide less frequently, so bonds are more likely to form.
B
More reactant particles have sufficient kinetic energy to overcome the Ea barrier.
C
The activation energy barrier of the reaction is lowered.
D
All of the above.
10) How does a catalyst increase the rate of a reaction?
A
It prevents the molecules from achieving a certain orientation.
B
It decreases the frequency of collisions between particles.
C
It can provide an alternative pathway with a lower Ea barrier.
D
It gives the reactants more kinetic energy.
11) A rate law can be determined from a reaction mechanism by:
A
Looking at the reactants of the initial step.
B
Identifying any intermediates, and incorporating them into the rate law.
C
Looking at the reactants of the slow (rate-determining) step.
D
Looking at the reactants of the overall balanced equation.
12) Which step below is rate-determining for a reaction with the following rate law: Rate = k|A|^2 |B|
A
Step 3: G + A = C + D
B
Step 1: A + B = F
C
Step 2: F + A -- C + G
*select an answer for all questions
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