Chapter 17:
Reaction Rates
Practice Test
1.
What is the term given to a temporary arrangement of atoms that may produce either products or reactants?
a.
transition state
b.
reactant
c.
activation energy
d.
collision
Hint
2.
A substance that speeds up the reaction rate but is not consumed in the reaction is a(n) ____________.
a.
product
b.
reactant
c.
inhibitor
d.
catalyst
Hint
3.
What is the reaction order for each reactant in the following rate-law expression? Rate =
k
[A][B]
2
[C]
3
a.
first order for A, second order for B, second order for C
b.
first order for A, first order for B, first order for C
c.
first order for A, second order for B, first order for C
d.
first order for A, second order for B, third order for C
Hint
4.
What is the name given to a catalyst that exists in the same physical state as the reaction being catalyzed?
a.
heterogeneous catalyst
b.
homogeneous catalyst
c.
solid-state catalyst
d.
ephemeral catalyst
Hint
5.
What is the slowest of the elementary steps in a complex reaction called?
a.
fast step
b.
propagating step
c.
rate-limiting step
d.
mechanism
Hint
6.
When the concentration of a reactant is increased, the _______________.
a.
reaction stops
b.
reaction rate does not change
c.
reaction slows down
d.
reaction speeds up
Hint
7.
What will happen when you decrease the surface area of a reactant?
a.
The reaction slows down.
b.
The reaction stops.
c.
The reaction rate does not change.
d.
The reaction speeds up.
Hint
8.
In the rate-law expression, Rate =
k
[A], what does the symbol
k
represent?
a.
instantaneous rate
b.
reaction order
c.
concentration
d.
specific rate constant
Hint
9.
When you increase the temperature of a chemical reaction, the ____________.
a.
reaction rate does not change
b.
reaction speeds up
c.
reaction stops
d.
reaction slows down
Hint
10.
The term that describes the change in the concentration of a reactant divided by the change in time of the reaction is the ____________.
a.
chemical reaction
b.
rate constant
c.
average reaction rate
d.
activated complex
Hint
11.
What happens to the activation energy of the reaction when a catalyst is present?
a.
The activation energy increases.
b.
The activation energy decreases.
c.
The activation energy does not change.
d.
The reaction stops.
Hint
12.
What Greek symbol is used to represent change?
a.
b.
→
c.
d.
Δ
Hint
13.
What are the individual steps in a complex reaction known as?
a.
elementary steps
b.
intermediate steps
c.
complex steps
d.
rate-determining steps
Hint
14.
Automobiles use a catalytic converter made of metal to ensure complete combustion of gasoline. What type of catalyst is present in automobiles?
a.
heterogeneous catalyst
b.
solid-state catalyst
c.
homogeneous catalyst
d.
ephemeral catalyst
Hint
15.
Which of the following is the theory that states that atoms, molecules, and ions must collide for a chemical reaction to occur?
a.
accident theory
b.
reaction theory
c.
mechanism
d.
collision theory
Hint
16.
What are the units that generally express a reaction rate?
a.
seconds per liter per mole
b.
moles per liter per second
c.
seconds per mole per liter
d.
liters per mole per second
Hint
17.
How are the rate law and the order for a complex reaction determined?
a.
by experimentation
b.
by trial and error
c.
by estimation
d.
by calculation
Hint
18.
What is the most common experimental method for evaluating a reaction order called?
a.
method of instantaneous rates
b.
method of initial rates
c.
method of final rates
d.
method of experimental rates
Hint
19.
What is the term used to describe the minimum energy needed to form an activated complex?
a.
kinetic energy
b.
activation energy
c.
potential energy
d.
temperature
Hint
20.
How much time has passed when 5 mol/L have reacted at an average rate of 0.5 mol/L·s?
a.
0.1 s
b.
1.0 s
c.
10 s
d.
100 s
Hint
