Question 1

Consider the reaction 2N2O5(g)  4NO2(g) + O2(g) 
Rate = k[N2O5]
If the initial concentration of N2O5 is 0.80 M,the concentration after 5 half-lives is

Accepted Answer

A)  0.11 M.
B)  0.025 M.
C)  0.032 M.
D)  0.16 M.
E)  0.050 M.F) All of the above
G) B) and E)

Question 2

Consider the reaction 2N2O(g)  2N2(g) + O2(g) 
Rate = k[N2O]
For an initial concentration of N2O of 0.50 M,what is the concentration of N2O remaining after 2.0 min if k = 3.4  103 s1?

Accepted Answer

A)  0.50 M
B)  0.55 M
C)  0.66 M
D)  0.33 M
E)  0.17 MF) A) and C)
G) B) and C)

Question 3

What is the half-life of a reaction that has a rate constant of 280 s1?

Accepted Answer

A)  194 s
B)  3.6 ms
C)  404 ms
D)  Because the concentration of reactant is not given, the calculation cannot be performed.
E)  2.5 msF) A) and B)
G) A) and E)

Question 4

The rate law for the following mechanism is NO2(g) + F2(g)  NO2F(g) + F(g) 
K1,slow
F(g) + NO2(g)  NO2F(g) 
K2,fast

Accepted Answer

A)  rate = k2[NO2]2. 
B)  rate = k2[NO2][F].
C)  rate = k1[NO2][F2].
D)  rate = k1k2[NO2]2. 
E)  rate = k1[NO2F][F].F) C) and D)
G) None of the above C

Question 5

For a zero-order reaction,the rate constant has the same units as the rate of reaction.True or false?

Accepted Answer

A) True 
 B)False

Question 6

Consider the reaction
2A F1F1F1S1F1F1F10 B,Rate = k[A]2
If the rate of disappearance of A is followed,derive the experimental rate constant.

Accepted Answer

2k; the numerical va...

Question 7

For the reaction HO(g) + H2(g)  H2O(g) + H(g) 
A plot of 2(g)  H2O(g) + H(g)  A plot of   versus 1/T gives a straight line with a slope equal to 5.1  103 K.What is the activation energy for the reaction? A) 42 kJmol1  B) 98 kJmol1  C) 0.61 kJmol1  D) 5.1 kJmol1  E) 12 kJmol1 " class="answers-bank-image d-inline" rel="preload" > versus 1/T gives a straight line with a slope equal to 5.1  103 K.What is the activation energy for the reaction?

Accepted Answer

A)  42 kJmol1 
B)  98 kJmol1 
C)  0.61 kJmol1 
D)  5.1 kJmol1 
E)  12 kJmol1 F) B) and E)
G) A) and E)

Question 8

For the reaction cyclobutane(g)  2ethylene(g) at 800 K,a plot of ln[cyclobutane] vs t gives a straight line with a slope of 1.6 s1.Calculate the time needed for the concentration of cyclobutane to fall to 1/16 of its initial value.

Accepted Answer

A)  2.3 s
B)  1.7 s
C)  1.3 s
D)  0.63 s
E)  1.6 sF) A) and E)
G) A) and D)

Question 9

The reaction 2NO(g)+ O2(g)F1F1F1S1F1F1F10 2NO2(g)has F1F1F1S1F1F1F10HrF1F1F1S1F1F1F10 = F1F1F1S1F1F1F10114 kJF1F1F1S1F1F1F10molF1F1F1S1F1F1F101.A possible mechanism for this reaction is
2NO(g)b N2O2(g)
rapid equilibrium,K
N2O2(g)+ O2(g)F1F1F1S1F1F1F10 2NO2(g)
slow,k
Draw the reaction profile diagram (plot of energy vs reaction coordinate)for this reaction and label any intermediates and activated complexes.

Accepted Answer

A and C are activated complexes and B is the intermediate N₂O₂(g).

Question 10

The reaction between nitrogen dioxide and carbon monoxide is thought to occur by the mechanism 2NO2(g)  NO3(g) + NO(g) 
K1,slow
NO3(g) + CO(g)  NO2(g) + CO2(g) 
K2,fast
The rate law for this mechanism is

Accepted Answer

A)  rate = k1k2[NO2]2[CO].
B)  rate = (k1/k2) [NO2]2[CO].
C)  rate = k1[NO3][NO].
D)  rate = k2[NO3][CO].
E)  rate = k1[NO2]2. F) A) and D)
G) C) and E)

Question 11

Given: CH4(g) + Cl2(g)  CH3Cl(g) + HCl(g) 
The rate law for this elementary process is

Accepted Answer

A)  rate = k[Cl2].
B)  k[CH3Cl][HCl].
C)  rate = k[CH4][Cl2].
D)  rate = k[CH4].
E)  rate = k[CH4]2. F) A) and D)
G) A) and E)

Question 12

The reaction profile for the mechanism NO2(g) + F2(g)  NO2F(g) + F(g) slow
F(g) + NO2(g)  NO2F(g) fast
Shows

Accepted Answer

A)  two maxima, the first maximum being the higher.
B)  two maxima, the second maximum being the higher.
C)  one maximum for the second step.
D)  two maxima, both the same height.E) A) and C)
F) C) and D)

Question 13

A certain reaction has a rate constant of 8.8 s1 at 298 K and 140 s1 at 323 K.What is the activation energy for this reaction?

Accepted Answer

A)  38 kJmol1 
B)  89 kJmol1 
C)  120 kJmol1 
D)  23 kJmol1 
E)  1.2 kJmol1 F) A) and E)
G) None of the above

Question 14

Given: 2A(g) + B(g)  C(g) + D(g) 
When [A] = [B] = 0.10 M,the rate is 2.0 Ms1; for [A] = [B] = 0.20,the rate is 8.0 Ms1; and for [A] = 0.10 M,[B] = 0.20 M,the rate is 2.0 Ms1.The rate law is

Accepted Answer

A)  rate = k[A].
B)  rate = k[B]2. 
C)  rate = k[A][B]0. 
D)  rate = k[A][B].
E)  rate = k[A]2. F) None of the above
G) A) and C)

Question 15

For the reaction cyclopropane  propene
A plot of ln[cyclopropane] vs time in seconds gives a straight line with slope 4.1  103 s1 at 550C.What is the rate constant for this reaction?

Accepted Answer

A)  3.9  102 s1 
B)  8.2  103 s1 
C)  4.1  103 s1 
D)  1.8  103 s1 
E)  2.1  103 s1 F) All of the above
G) B) and D)

Question 16

What is the rate constant for a first-order reaction with a half-life of 9.0 ms?

Accepted Answer

A)  13 s1 
B)  77 s1 
C)  9.0 s1 
D)  6.2 s1 
E)  0.11 s1 F) B) and D)
G) B) and C)

Question 17

Given: 4Fe2+(aq) + O2(aq) + 2H2O(l)  4Fe3+(aq) + 4OH(aq) 
Rate = k[Fe2+][OH]2[O2]
The overall order of the reaction and the order with respect to O2 are

Accepted Answer

A)  4 and 1.
B)  5 and 1.
C)  3 and 1.
D)  4 and 2.
E)  7 and 1.F) C) and E)
G) A) and B)

Question 18

Consider the following mechanism for the production of phosgene.
Cl2 F1F1F1S1F1F1F10 Cl + Cl
Cl + CO F1F1F1S1F1F1F10 COCl
COCl + Cl F1F1F1S1F1F1F10 COCl2
The molecularity of the first and second elementary reactions is ____ and ____.

Accepted Answer

Question 19

The concentrationtime dependence for a first-order reaction is: time dependence for a first-order reaction is:   At which point on the curve is the reaction fastest? A) A B) B C) C D) A + t½ E) The rates are the same at all points." class="answers-bank-image d-inline" rel="preload" > At which point on the curve is the reaction fastest?

Accepted Answer

A)  A
B)  B
C)  C
D)  A + t½
E)  The rates are the same at all points.F) C) and D)
G) A) and C) A

Question 20

A catalyst facilitates a reaction by

Accepted Answer

A)  increasing the activation energy for the reverse reaction.
B)  lowering the activation energy of the reaction.
C)  shifting the position of the equilibrium of the reaction.
D)  decreasing the temperature at which the reaction will proceed spontaneously.
E)  making the reaction more exothermic.F) None of the above
G) A) and D)

Exam 15: Chemical Kinetics

Consider the reaction 2N₂O₅(g)  4NO₂(g) + O₂(g) Rate = k[N₂O₅] If the initial concentration of N₂O₅ is 0.80 M,the concentration after 5 half-lives is

Correct Answer
verified

Consider the reaction 2N₂O(g)  2N₂(g) + O₂(g) Rate = k[N₂O] For an initial concentration of N₂O of 0.50 M,what is the concentration of N₂O remaining after 2.0 min if k = 3.4  10^³ s^¹?

Correct Answer
verified

What is the half-life of a reaction that has a rate constant of 280 s^¹?

Correct Answer
verified

The rate law for the following mechanism is NO₂(g) + F₂(g)  NO₂F(g) + F(g) K₁,slow F(g) + NO₂(g)  NO₂F(g) K₂,fast

Correct Answer
verified
C

For a zero-order reaction,the rate constant has the same units as the rate of reaction.True or false?

Correct Answer
verified

Consider the reaction 2A  B,Rate = k[A]² If the rate of disappearance of A is followed,derive the experimental rate constant.

Correct Answer
verified
2k; the numerical va...
View Answer

For the reaction HO(g) + H₂(g)  H₂O(g) + H(g) A plot of versus 1/T gives a straight line with a slope equal to 5.1  10³ K.What is the activation energy for the reaction?

Correct Answer
verified

For the reaction cyclobutane(g)  2ethylene(g) at 800 K,a plot of ln[cyclobutane] vs t gives a straight line with a slope of 1.6 s^¹.Calculate the time needed for the concentration of cyclobutane to fall to 1/16 of its initial value.

Correct Answer
verified

Correct Answer
verified
11ea7e73_3894_dc01_9a0a_b3d6cfb44b93_TB1039_00 A and C are activated complexes and B is the intermediate N₂O₂(g).

The reaction between nitrogen dioxide and carbon monoxide is thought to occur by the mechanism 2NO₂(g)  NO₃(g) + NO(g) K₁,slow NO₃(g) + CO(g)  NO₂(g) + CO₂(g) K₂,fast The rate law for this mechanism is

Correct Answer
verified

Given: CH₄(g) + Cl₂(g)  CH₃Cl(g) + HCl(g) The rate law for this elementary process is

Correct Answer
verified

The reaction profile for the mechanism NO₂(g) + F₂(g)  NO₂F(g) + F(g) slow F(g) + NO₂(g)  NO₂F(g) fast Shows

Correct Answer
verified

A certain reaction has a rate constant of 8.8 s^¹ at 298 K and 140 s^¹ at 323 K.What is the activation energy for this reaction?

Correct Answer
verified

Given: 2A(g) + B(g)  C(g) + D(g) When [A] = [B] = 0.10 M,the rate is 2.0 Ms^¹; for [A] = [B] = 0.20,the rate is 8.0 Ms^¹; and for [A] = 0.10 M,[B] = 0.20 M,the rate is 2.0 Ms^¹.The rate law is

Correct Answer
verified

For the reaction cyclopropane  propene A plot of ln[cyclopropane] vs time in seconds gives a straight line with slope 4.1  10^³ s^¹ at 550C.What is the rate constant for this reaction?

Correct Answer
verified

What is the rate constant for a first-order reaction with a half-life of 9.0 ms?

Correct Answer
verified

Given: 4Fe²⁺(aq) + O₂(aq) + 2H₂O(l)  4Fe³⁺(aq) + 4OH^(aq) Rate = k[Fe²⁺][OH^]²[O₂] The overall order of the reaction and the order with respect to O₂ are

Correct Answer
verified

Consider the following mechanism for the production of phosgene. Cl₂  Cl + Cl Cl + CO  COCl COCl + Cl  COCl₂ The molecularity of the first and second elementary reactions is and .

Correct Answer
verified

The concentrationtime dependence for a first-order reaction is: At which point on the curve is the reaction fastest?

Correct Answer
verified
A

A catalyst facilitates a reaction by

Correct Answer
verified

Exam 15: Chemical Kinetics

Consider the reaction 2N2O5(g)  4NO2(g) + O2(g) Rate = k[N2O5] If the initial concentration of N2O5 is 0.80 M,the concentration after 5 half-lives is

Correct AnswerverifiedShow Answer

Consider the reaction 2N2O(g)  2N2(g) + O2(g) Rate = k[N2O] For an initial concentration of N2O of 0.50 M,what is the concentration of N2O remaining after 2.0 min if k = 3.4  103 s1?

Correct AnswerverifiedShow Answer

What is the half-life of a reaction that has a rate constant of 280 s1?

Correct AnswerverifiedShow Answer

The rate law for the following mechanism is NO2(g) + F2(g)  NO2F(g) + F(g) K1,slow F(g) + NO2(g)  NO2F(g) K2,fast

Correct AnswerverifiedC

For a zero-order reaction,the rate constant has the same units as the rate of reaction.True or false?

Correct AnswerverifiedShow Answer

Consider the reaction 2A  B,Rate = k[A]2 If the rate of disappearance of A is followed,derive the experimental rate constant.

Correct Answerverified2k; the numerical va...View AnswerShow Answer

For the reaction HO(g) + H2(g)  H2O(g) + H(g) A plot of versus 1/T gives a straight line with a slope equal to 5.1  103 K.What is the activation energy for the reaction?

Correct AnswerverifiedShow Answer

For the reaction cyclobutane(g)  2ethylene(g) at 800 K,a plot of ln[cyclobutane] vs t gives a straight line with a slope of 1.6 s1.Calculate the time needed for the concentration of cyclobutane to fall to 1/16 of its initial value.

Correct AnswerverifiedShow Answer

Correct Answerverified11ea7e73_3894_dc01_9a0a_b3d6cfb44b93_TB1039_00 A and C are activated complexes and B is the intermediate N2O2(g).

The reaction between nitrogen dioxide and carbon monoxide is thought to occur by the mechanism 2NO2(g)  NO3(g) + NO(g) K1,slow NO3(g) + CO(g)  NO2(g) + CO2(g) K2,fast The rate law for this mechanism is

Correct AnswerverifiedShow Answer

Given: CH4(g) + Cl2(g)  CH3Cl(g) + HCl(g) The rate law for this elementary process is

Correct AnswerverifiedShow Answer

The reaction profile for the mechanism NO2(g) + F2(g)  NO2F(g) + F(g) slow F(g) + NO2(g)  NO2F(g) fast Shows

Correct AnswerverifiedShow Answer

A certain reaction has a rate constant of 8.8 s1 at 298 K and 140 s1 at 323 K.What is the activation energy for this reaction?

Correct AnswerverifiedShow Answer

Given: 2A(g) + B(g)  C(g) + D(g) When [A] = [B] = 0.10 M,the rate is 2.0 Ms1; for [A] = [B] = 0.20,the rate is 8.0 Ms1; and for [A] = 0.10 M,[B] = 0.20 M,the rate is 2.0 Ms1.The rate law is

Correct AnswerverifiedShow Answer

For the reaction cyclopropane  propene A plot of ln[cyclopropane] vs time in seconds gives a straight line with slope 4.1  103 s1 at 550C.What is the rate constant for this reaction?

Correct AnswerverifiedShow Answer

What is the rate constant for a first-order reaction with a half-life of 9.0 ms?

Correct AnswerverifiedShow Answer

Given: 4Fe2+(aq) + O2(aq) + 2H2O(l)  4Fe3+(aq) + 4OH(aq) Rate = k[Fe2+][OH]2[O2] The overall order of the reaction and the order with respect to O2 are

Correct AnswerverifiedShow Answer

Consider the following mechanism for the production of phosgene. Cl2  Cl + Cl Cl + CO  COCl COCl + Cl  COCl2 The molecularity of the first and second elementary reactions is ____ and ____.

Correct AnswerverifiedShow Answer

The concentrationtime dependence for a first-order reaction is: At which point on the curve is the reaction fastest?

Correct AnswerverifiedA

A catalyst facilitates a reaction by

Correct AnswerverifiedShow Answer

Consider the reaction 2N₂O₅(g)  4NO₂(g) + O₂(g) Rate = k[N₂O₅] If the initial concentration of N₂O₅ is 0.80 M,the concentration after 5 half-lives is

Correct Answer
verified

Consider the reaction 2N₂O(g)  2N₂(g) + O₂(g) Rate = k[N₂O] For an initial concentration of N₂O of 0.50 M,what is the concentration of N₂O remaining after 2.0 min if k = 3.4  10^³ s^¹?

Correct Answer
verified

What is the half-life of a reaction that has a rate constant of 280 s^¹?

Correct Answer
verified

The rate law for the following mechanism is NO₂(g) + F₂(g)  NO₂F(g) + F(g) K₁,slow F(g) + NO₂(g)  NO₂F(g) K₂,fast

Correct Answer
verified
C

Correct Answer
verified

Consider the reaction 2A  B,Rate = k[A]² If the rate of disappearance of A is followed,derive the experimental rate constant.

Correct Answer
verified
2k; the numerical va...
View Answer

For the reaction HO(g) + H₂(g)  H₂O(g) + H(g) A plot of versus 1/T gives a straight line with a slope equal to 5.1  10³ K.What is the activation energy for the reaction?

Correct Answer
verified

For the reaction cyclobutane(g)  2ethylene(g) at 800 K,a plot of ln[cyclobutane] vs t gives a straight line with a slope of 1.6 s^¹.Calculate the time needed for the concentration of cyclobutane to fall to 1/16 of its initial value.

Correct Answer
verified

Correct Answer
verified
11ea7e73_3894_dc01_9a0a_b3d6cfb44b93_TB1039_00 A and C are activated complexes and B is the intermediate N₂O₂(g).

The reaction between nitrogen dioxide and carbon monoxide is thought to occur by the mechanism 2NO₂(g)  NO₃(g) + NO(g) K₁,slow NO₃(g) + CO(g)  NO₂(g) + CO₂(g) K₂,fast The rate law for this mechanism is

Correct Answer
verified

Given: CH₄(g) + Cl₂(g)  CH₃Cl(g) + HCl(g) The rate law for this elementary process is

Correct Answer
verified

The reaction profile for the mechanism NO₂(g) + F₂(g)  NO₂F(g) + F(g) slow F(g) + NO₂(g)  NO₂F(g) fast Shows

Correct Answer
verified

A certain reaction has a rate constant of 8.8 s^¹ at 298 K and 140 s^¹ at 323 K.What is the activation energy for this reaction?

Correct Answer
verified

Given: 2A(g) + B(g)  C(g) + D(g) When [A] = [B] = 0.10 M,the rate is 2.0 Ms^¹; for [A] = [B] = 0.20,the rate is 8.0 Ms^¹; and for [A] = 0.10 M,[B] = 0.20 M,the rate is 2.0 Ms^¹.The rate law is

Correct Answer
verified

For the reaction cyclopropane  propene A plot of ln[cyclopropane] vs time in seconds gives a straight line with slope 4.1  10^³ s^¹ at 550C.What is the rate constant for this reaction?

Correct Answer
verified

Correct Answer
verified

Given: 4Fe²⁺(aq) + O₂(aq) + 2H₂O(l)  4Fe³⁺(aq) + 4OH^(aq) Rate = k[Fe²⁺][OH^]²[O₂] The overall order of the reaction and the order with respect to O₂ are

Correct Answer
verified

Consider the following mechanism for the production of phosgene. Cl₂  Cl + Cl Cl + CO  COCl COCl + Cl  COCl₂ The molecularity of the first and second elementary reactions is and .

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
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