Unit 11 - Final Exam Review Question Preview (ID: 56210)
Kinetics Review.
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A rate law can be determined from a reaction mechanism by:
a) Identifying any intermediates, and incorporating them into the rate law.
b) Looking at the reactants of the overall balanced equation.
c) Looking at the reactants of the initial step.
d) Looking at the reactants of the slow (rate-determining) step.
How does a catalyst increase the rate of a reaction?
a) It can provide an alternative pathway with a lower Ea barrier.
b) It prevents the molecules from achieving a certain orientation.
c) It gives the reactants more kinetic energy.
d) It decreases the frequency of collisions between particles.
Reaction rate increases with an increase in temperature because:
a) More reactant particles have sufficient kinetic energy to overcome the Ea barrier.
b) The activation energy barrier of the reaction is lowered.
c) The particles collide less frequently, so bonds are more likely to form.
d) All of the above.
A rate constant can be determined graphically for a first order reaction by:
a) Finding the slope of |A| vs time
b) Finding the slope of ln|A| vs time
c) Using the following integrated rate law: 1/|A|t = -kt + 1/|A|o
d) Any of the above.
Which of the following could be units for a second order reaction?
a) M-2 s-1
b) M2 s-1
c) M-1 s-1
d) M/s
Which plot vs time will yield a straight line for a second order reaction?
a) ln|A|
b) |A|
c) 1/|A|
d) |A|^2
Which type of reaction will have a value of half life which is independent of reactant concentration?
a) Zero
b) First
c) Second
d) Third
In which reaction would the rate quadruple if the concentration of A is doubled?
a) rate = k |A| |B|
b) rate = k |A|^2 |B|
c) rate = k |A| |B| |C|
d) rate = k |A|^3
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) 0.250 M/s
b) 0.125 M/s
c) 0.500 M/s
d) 0.375 M/s
Which reaction is 2nd order overall?
a) rate = k |A| |B|
b) rate = k |A|^2 |B|
c) rate = k |A| |B| |C|
d) rate = k |A|^3
Which action will slow down the reaction between Mg metal and HCl?
a) Decrease the temperature of the HCl solution.
b) Crush the magnesium into a powder.
c) Increase the molarity of the HCl solution.
d) Add a catalyst to the mixture.
Which step below is rate-determining for a reaction with the following rate law: Rate = k|A|^2 |B|
a) Step 1: A + B = F
b) Step 2: F + A -- C + G
c) Step 3: G + A = C + D
d)
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