Chemistry: Matter and Change

Chapter 16: Reaction Rates

Standardized Test Practice

1
The term that describes the change in the concentration of a reactant divided by the change in time of the reaction is the ____________.
A)rate constant
B)average reaction rate
C)activated complex
D)chemical reaction
2
What is the term used to describe the minimum energy needed to form an activated complex?
A)temperature
B)kinetic energy
C)activation energy
D)potential energy
3
Chemical A breaks down into chemical B. At t=0, [B] = 0.00 M. At t=5.00 s, [B] = 0.150M. What is the average reaction rate?

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A)-0.0300 mol/Ls
B)0.0300 mol/Ls
C)0.300 mol/Ls
D)-0.300 mol/Ls
4
What factors might prevent a collision of molecules from resulting in a reaction?

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A)incorrect orientation
B)insufficient energy
C)both a and b
D)none of the above
5
What will happen when you decrease the surface area of a reactant?
A)The reaction speeds up.
B)The reaction slows down.
C)The reaction stops.
D)The reaction rate does not change.
6
A substance that speeds up the reaction rate but is not consumed in the reaction is a(n) ____________.
A)reactant
B)product
C)catalyst
D)inhibitor
7
What is the name given to a catalyst that exists in the same physical state as the reaction being catalyzed?
A)homogeneous catalyst
B)heterogeneous catalyst
C)solid-state catalyst
D)ephemiral catalyst
8
In the rate-law expression, Rate = k[A], what does the symbol k represent?
A)instantaneous rate
B)concentration
C)specific rate constant
D)reaction order
9
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, first order for B, first order for C
B)first order for A, second order for B, first order for C
C)first order for A, second order for B, third order for C
D)first order for A, second order for B, second order for C
10
What is the most common experimental method for evaluating a reaction order called?
A)method of final rates
B)method of instantaneous rates
C)method of initial rates
D)method of experimental rates
11
Suppose the rate law for a particular chemical reaction involving reactants Q and T is Rate = k[Q]2[T]2. What will be the result of doubling the concentration of Q?
A)rate doubles
B)rate halves
C)rate triples
D)rate quadruples
12
What is the instantaneous rate for a reaction that is second order in A and first order in B when [A] = 2M and [B] = 3M? The specific rate constant for the reaction is 0.1 M-2s-1.
A)12 M/s
B)1.2 M/s
C)0.12 M/s
D)0.012 M/s
13
What are the units that generally express a reaction rate?
A)liters per mole per second
B)moles per liter per second
C)seconds per liter per mole
D)seconds per mole per liter
14
What are the individual steps in a complex reaction known as?
A)complex steps
B)elementary steps
C)intermediate steps
D)rate-determining steps
15
In the reaction shown, which of the three activated complexes represents the rate-determining step?

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A)the first
B)the second
C)the third
D)none of these
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