Question 1

Exhibit 12-2 For the following question(s), consider the following reaction mechanism:
  Refer to Exhibit 12-2. The intermediates in this reaction are

Accepted Answer

A)  Z and V. 
B)  X and Y. 
C)  Y only. 
D)  W and Y. 
E)  There are no intermediates in this reaction. 
A)  Z and V. 
B)  X and Y. 
C)  Y only. 
D)  W and Y. 
E)  There are no intermediates in this reaction.

Question 2

Exhibit 12-1 The following question(s) relate to the reaction between water and a complex ion of Co2+; the rate varies with concentration as follows. (The rate has no dependence on [H2O].)
  Refer to Exhibit 12-1. The rate law for the reaction is rate =

Accepted Answer

A)  k2[Co2+ complex]. 
B)  k[Co2+ complex]. 
C)  2k[Co2+ complex]. 
D)  k[Co2+ complex]/2. 
E)  k[Co2+ complex]2. 
A)  k2[Co2+ complex]. 
B)  k[Co2+ complex]. 
C)  2k[Co2+ complex]. 
D)  k[Co2+ complex]/2. 
E)  k[Co2+ complex]2.

Question 3

For a first-order reaction, which expression describes the relationship between the rate constant, k, and the half-life, t1/2?

Accepted Answer

A)  t1/2 = 2 / k 
B)  t1/2 = ln 2 / k 
C)  t1/2 = k / 2 
D)  t1/2 = ln 2 × k 
E)  t1/2 = k / ln 2 
A)  t1/2 = 2 / k 
B)  t1/2 = ln 2 / k 
C)  t1/2 = k / 2 
D)  t1/2 = ln 2 × k 
E)  t1/2 = k / ln 2

Question 4

A reaction displays zero-order kinetics for its single reactant. It therefore follows that a plot of ____ versus time is linear, and that the slope of this plot = ____.

Accepted Answer

A)  [reactant]; -k 
B)  [reactant]; k 
C)  1/[reactant]; -k 
D)  1/[reactant]; k 
E)  ln[reactant]; -k 
A)  [reactant]; -k 
B)  [reactant]; k 
C)  1/[reactant]; -k 
D)  1/[reactant]; k 
E)  ln[reactant]; -k

Question 5

If an elementary reaction is exothermic, then

Accepted Answer

A)  The activation energy for the forward reaction is smaller than that for the reverse reaction. 
B)  The sum of activation energies gives the value of DH for the reaction. 
C)  The activation energy for the forward reaction is larger than that for the reverse reaction. 
D)  The activation energy for the forward reaction is positive, and for the reverse reaction, negative. 
E)  The activation energy for the forward reaction is negative, and for the reverse reaction, positive. 
A)  The activation energy for the forward reaction is smaller than that for the reverse reaction. 
B)  The sum of activation energies gives the value of DH for the reaction. 
C)  The activation energy for the forward reaction is larger than that for the reverse reaction. 
D)  The activation energy for the forward reaction is positive, and for the reverse reaction, negative. 
E)  The activation energy for the forward reaction is negative, and for the reverse reaction, positive.

Question 6

The rate constant for the reaction   1 doubles on raising the temperature from 410$\circ$C to 425$\circ$C. The activation energy, in J/mol, is

Accepted Answer

A)  5.3 × 105. 
B)  1.8 × 105. 
C)  9.1 × 104. 
D)  6.7 × 104. 
E)  -1.9 × 105. 
A)  5.3 × 105. 
B)  1.8 × 105. 
C)  9.1 × 104. 
D)  6.7 × 104. 
E)  -1.9 × 105.

Question 7

Consider the hypothetical reaction   The rate of reaction is ____ times D[B]/Dt and ____ times D[C]/Dt.

Accepted Answer

A)  -2; -3 
B)  -1/3; 1/2 
C)  1/2; -1/3 
D)  -1/2; -1/3 
E)  -1; 2/3 
A)  -2; -3 
B)  -1/3; 1/2 
C)  1/2; -1/3 
D)  -1/2; -1/3 
E)  -1; 2/3

Question 8

For a new chemical reaction involving several reactants, the order of reaction with respect to each reactant

Accepted Answer

A)  is easily determined from reactions similar to the one in question 
B)  may be determined from the coefficient for the respective reactant in the balanced chemical equation 
C)  must be determined from the rate constant at time = 0 
D)  must be determined from the overall order of the reaction 
E)  must be determined experimentally using one or more methods 
A)  is easily determined from reactions similar to the one in question 
B)  may be determined from the coefficient for the respective reactant in the balanced chemical equation 
C)  must be determined from the rate constant at time = 0 
D)  must be determined from the overall order of the reaction 
E)  must be determined experimentally using one or more methods

Question 9

From the stoichiometry of the reaction   the rate law

Accepted Answer

A)  is predicted to be third-order overall. 
B)  is predicted to be first-order in I2(s). 
C)  is predicted to be first-order in all reactants. 
D)  is predicted to be fifth-order overall. 
E)  cannot be predicted. 
A)  is predicted to be third-order overall. 
B)  is predicted to be first-order in I2(s). 
C)  is predicted to be first-order in all reactants. 
D)  is predicted to be fifth-order overall. 
E)  cannot be predicted.

Question 10

In a bimolecular reaction, which term can be equated to the probability that a collision between molecules will have the correct relative orientation for chemical reaction to occur?

Accepted Answer

A)  steric factor 
B)  Arrhenius Equation 
C)  molecularity 
D)  activation energy 
E)  frequency factor 
A)  steric factor 
B)  Arrhenius Equation 
C)  molecularity 
D)  activation energy 
E)  frequency factor

Question 11

Which of the following could not be the units of a rate constant?

Accepted Answer

A)  min-1 
B)  M min-1 
C)  M-1 min-1 
D)  M2 min-1 
E)  M-2 min-1 
A)  min-1 
B)  M min-1 
C)  M-1 min-1 
D)  M2 min-1 
E)  M-2 min-1

Question 12

Which statement is true about a catalyst?

Accepted Answer

A)  It increases the activation energy involved in a reaction. 
B)  It can be the same phase as the reactants (heterogeneous) or a different phase (homogeneous). 
C)  It is formed during an early step in the reaction and consumed in a later step. 
D)  It does not participate in the reaction. 
E)  It does not appear in the overall equation for the reaction. 
A)  It increases the activation energy involved in a reaction. 
B)  It can be the same phase as the reactants (heterogeneous) or a different phase (homogeneous). 
C)  It is formed during an early step in the reaction and consumed in a later step. 
D)  It does not participate in the reaction. 
E)  It does not appear in the overall equation for the reaction.

Question 13

The species representing the combination of atoms or molecules at the top of the activation energy barrier is called the

Accepted Answer

A)  frequency factor. 
B)  activated complex. 
C)  catalytic convertor. 
D)  reaction intermediate. 
E)  enthalpy of reaction. 
A)  frequency factor. 
B)  activated complex. 
C)  catalytic convertor. 
D)  reaction intermediate. 
E)  enthalpy of reaction.

Question 14

When two atoms, molecules or ions are involved in an elementary reaction, it is said to be a(n):

Accepted Answer

A)  activated complexation. 
B)  unimolecular reaction. 
C)  first-order reaction. 
D)  bimolecular reaction. 
E)  Arrhenius reaction. 
A)  activated complexation. 
B)  unimolecular reaction. 
C)  first-order reaction. 
D)  bimolecular reaction. 
E)  Arrhenius reaction.

Question 15

If an elementary reaction involves the collision of two identical molecules, then the elementary reaction is ____, and the kinetics will be ____.

Accepted Answer

A)  unimolecular; zeroth-order. 
B)  unimolecular; first-order. 
C)  unimolecular; second-order. 
D)  bimolecular; first-order. 
E)  bimolecular; second-order. 
A)  unimolecular; zeroth-order. 
B)  unimolecular; first-order. 
C)  unimolecular; second-order. 
D)  bimolecular; first-order. 
E)  bimolecular; second-order.

Question 16

In a reaction that is first-order with respect to reactant A and second-order with respect to reactant B, the rate of the reaction

Accepted Answer

A)  doubles with a doubling of the concentration of either reactant 
B)  doubles with a doubling of the concentration of B 
C)  is halved by a doubling of the concentration of B 
D)  is tripled by any equal and simultaneous increase in the concentration of A and B 
E)  quadrupled by a doubling in the concentration of B while the concentration of A is held constant 
A)  doubles with a doubling of the concentration of either reactant 
B)  doubles with a doubling of the concentration of B 
C)  is halved by a doubling of the concentration of B 
D)  is tripled by any equal and simultaneous increase in the concentration of A and B 
E)  quadrupled by a doubling in the concentration of B while the concentration of A is held constant

Question 17

The rate of the chemical reaction involving two substances, A and B, is measured. It is found that if the initial concentration of A used is doubled, keeping the B concentration the same, the rate doubles. If the concentrations of both A and B are doubled, the rate is eight times that measured in the first experiment. The rate law for this reaction is rate =

Accepted Answer

A)  k[A][B]. 
B)  k[A]2[B]. 
C)  k[A][B]2. 
D)  2k[A][B]. 
E)  k[A][B]/2. 
A)  k[A][B]. 
B)  k[A]2[B]. 
C)  k[A][B]2. 
D)  2k[A][B]. 
E)  k[A][B]/2.

Question 18

Consider the reaction   Use the data shown to determine the rate law for the reaction.

Accepted Answer

A)  rate = k[NO2] [O3] 
B)  rate = k[NO2]2 [O3] 
C)  rate = k[NO2] [O3]2 
D)  rate = k[NO2] 
E)  rate = k[NO3] [O3] / [NO2] [O2] 
A)  rate = k[NO2] [O3] 
B)  rate = k[NO2]2 [O3] 
C)  rate = k[NO2] [O3]2 
D)  rate = k[NO2] 
E)  rate = k[NO3] [O3] / [NO2] [O2]

Question 19

The rate constant for the first-order conversion of A to B is 3.33 hr-1. How much time will be required for the concentration of A to reach 75% of its original value?

Accepted Answer

A)  0.086 hr 
B)  0.83 hr 
C)  0.96 hr 
D)  2.50 hr 
E)  4.44 hr 
A)  0.086 hr 
B)  0.83 hr 
C)  0.96 hr 
D)  2.50 hr 
E)  4.44 hr

Question 20

The table below gives the rate constant for a certain reaction at 
a.	the activation energy for this reaction.
b.	the frequency factor.
c.	the value of k at 1100K.

Accepted Answer

a.	Plotting lnk versus 1/T yields a stra

Exhibit 12-2 For the following question(s), consider the following reaction mechanism: Refer to Exhibit 12-2. The intermediates in this reaction are

Exhibit 12-1 The following question(s) relate to the reaction between water and a complex ion of Co²⁺; the rate varies with concentration as follows. (The rate has no dependence on [H₂O].) Refer to Exhibit 12-1. The rate law for the reaction is rate =

For a first-order reaction, which expression describes the relationship between the rate constant, k, and the half-life, t_1/2?

A reaction displays zero-order kinetics for its single reactant. It therefore follows that a plot of versus time is linear, and that the slope of this plot = .

If an elementary reaction is exothermic, then

Consider the hypothetical reaction The rate of reaction is times D[B]/Dt and times D[C]/Dt.

For a new chemical reaction involving several reactants, the order of reaction with respect to each reactant

From the stoichiometry of the reaction the rate law

In a bimolecular reaction, which term can be equated to the probability that a collision between molecules will have the correct relative orientation for chemical reaction to occur?

Which of the following could not be the units of a rate constant?

Which statement is true about a catalyst?

The species representing the combination of atoms or molecules at the top of the activation energy barrier is called the

When two atoms, molecules or ions are involved in an elementary reaction, it is said to be a(n):

If an elementary reaction involves the collision of two identical molecules, then the elementary reaction is , and the kinetics will be .

In a reaction that is first-order with respect to reactant A and second-order with respect to reactant B, the rate of the reaction

Consider the reaction Use the data shown to determine the rate law for the reaction.

The rate constant for the first-order conversion of A to B is 3.33 hr^-1. How much time will be required for the concentration of A to reach 75% of its original value?

The table below gives the rate constant for a certain reaction at a. the activation energy for this reaction. b. the frequency factor. c. the value of k at 1100K.

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Exam 12: Chemical Kinetics: Rates of Reactions

Exhibit 12-2 For the following question(s), consider the following reaction mechanism: Refer to Exhibit 12-2. The intermediates in this reaction are

Exhibit 12-1 The following question(s) relate to the reaction between water and a complex ion of Co2+; the rate varies with concentration as follows. (The rate has no dependence on [H2O].) Refer to Exhibit 12-1. The rate law for the reaction is rate =

For a first-order reaction, which expression describes the relationship between the rate constant, k, and the half-life, t1/2?

A reaction displays zero-order kinetics for its single reactant. It therefore follows that a plot of ____ versus time is linear, and that the slope of this plot = ____.

If an elementary reaction is exothermic, then

The rate constant for the reaction 1 doubles on raising the temperature from 410 ∘\circ∘ C to 425 ∘\circ∘ C. The activation energy, in J/mol, is

Consider the hypothetical reaction The rate of reaction is ____ times D[B]/Dt and ____ times D[C]/Dt.

For a new chemical reaction involving several reactants, the order of reaction with respect to each reactant

From the stoichiometry of the reaction the rate law

In a bimolecular reaction, which term can be equated to the probability that a collision between molecules will have the correct relative orientation for chemical reaction to occur?

Which of the following could not be the units of a rate constant?

Which statement is true about a catalyst?

The species representing the combination of atoms or molecules at the top of the activation energy barrier is called the

When two atoms, molecules or ions are involved in an elementary reaction, it is said to be a(n):

If an elementary reaction involves the collision of two identical molecules, then the elementary reaction is ____, and the kinetics will be ____.

In a reaction that is first-order with respect to reactant A and second-order with respect to reactant B, the rate of the reaction

Consider the reaction Use the data shown to determine the rate law for the reaction.

The rate constant for the first-order conversion of A to B is 3.33 hr-1. How much time will be required for the concentration of A to reach 75% of its original value?

The table below gives the rate constant for a certain reaction at a. the activation energy for this reaction. b. the frequency factor. c. the value of k at 1100K.

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Chemical Reactions

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Covalent Bonding

Molecular Structure

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Liquids, Solids, and Materials

Chemical Equilibrium

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Exhibit 12-1 The following question(s) relate to the reaction between water and a complex ion of Co²⁺; the rate varies with concentration as follows. (The rate has no dependence on [H₂O].) Refer to Exhibit 12-1. The rate law for the reaction is rate =

For a first-order reaction, which expression describes the relationship between the rate constant, k, and the half-life, t_1/2?

A reaction displays zero-order kinetics for its single reactant. It therefore follows that a plot of versus time is linear, and that the slope of this plot = .

Consider the hypothetical reaction The rate of reaction is times D[B]/Dt and times D[C]/Dt.

If an elementary reaction involves the collision of two identical molecules, then the elementary reaction is , and the kinetics will be .

The rate constant for the first-order conversion of A to B is 3.33 hr^-1. How much time will be required for the concentration of A to reach 75% of its original value?