Chemistry: Matter and Change

Chapter 16: Reaction Rates

Chapter Test Practice

1
How much time has passed when 5 mol/L have reacted at an average rate of 0.5 mol/L·s?
A)1.0 s
B)10 s
C)100 s
D)0.1 s
2
What is the name of the unstable molecule formed during the collision of A2 and B2?

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A)product
B)reactant
C)activated complex
D)diatomic molecule
3
Activation energy is ________.

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A)the energy released by a chemical reaction.
B)the energy absorbed by a chemical reaction.
C)the energy reacting particles must have to form the activated complex
D)the energy produced by the combustion of the reactants
4
Automobiles use a catalytic converter made of metal to ensure complete combustion of gasoline. What type of catalyst is present in automobiles?
A)homogeneous catalyst
B)heterogeneous catalyst
C)solid-state catalyst
D)ephemiral catalyst
5
What might an inhibitor do in a chemical reaction?
A)speed up the reaction
B)drive the reaction to completion
C)raise the activation energy
D)lower the activation energy
6
What is the overall reaction order for the following rate-law expression? Rate = k[A][B]2[C]3
A)4
B)5
C)6
D)7
7
How are the rate law and the order for a complex reaction determined?
A)by calculation
B)by experimentation
C)by trial and error
D)by estimation
8
As reactants are consumed and fewer particles are available to collide, most chemical reactions ________.

Rate = k[A]
A)speed up
B)slow down
C)stop
D)continue at the same rate
9
In the reaction of hydrogen peroxide, what happens to the instantaneous rate as time passes?

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A)the rate increases
B)the rate decreases
C)the rate stays the same
D)the rate doubles
10
In the reaction shown, what are the intermediates?

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A)NO and H2
B)N2O2 and H2
C)N2O2 and H2O
D)N2O2, H2O and H2
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