Question 1

Consider the following potential energy profile for the A → B reaction.Assuming that the frequency factor for the reaction is 5.5×1010 s-1,what is the rate constant of this first-order reaction at 310 K? 10 s-1,what is the rate constant of this first-order reaction at 310 K?   A) 2 × 102 s-1 B) 5 × 105 s-1 C) 1 × 1019 s-1 D) 2 × 107 s-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  2 × 102 s-1
B)  5 × 105 s-1
C)  1 × 1019 s-1
D)  2 × 107 s-1

Question 2

Consider the general reaction 5Br-(aq) + Br O3-(aq) + 6H+(aq) → 3Br2(aq) + 3 H2O(aq) 
For this reaction,which is equal to Δ[Br2]/Δt?

Accepted Answer

A)  -Δ[H2O]/Δt
B)  3Δ[Br O3-]/Δt
C)  -5Δ[Br-]/Δt
D)  -0.6Δ[Br-]/Δt
E)  None of these choices is correct.

Question 3

What is the integrated rate law for a second-order reaction?

Accepted Answer

A)  rate = k[A]t
B)   
C)   
D)   
E)

Question 4

The rate of a ________-_________________ is a constant that is independent of reactant concentration.

Accepted Answer

zeroth-ord...

Question 5

What is the half-life for a second-order reaction?

Accepted Answer

A)  t1/2 = k
B)  t1/2 = 1/k[A]o
C)  t1/2 = 0.693/k[A]o
D)  t1/2 = [A]o/2k
E)  t1/2 = 0.693/k

Question 6

The step of the reaction mechanism which is the slowest step is called _______-________.

Accepted Answer

The answer of The step of the reaction mechanism which...

Question 7

The isomerization of cyclopropane follows first-order kinetics.The rate constant at 700.K is 6.20 × 10-4 min-1,and the half-life at 760.K is 29.0 min.What is the activation energy for this reaction? (R = 8.314 J/mol• K)

Accepted Answer

A)  5.07 kJ/mol
B)  27.0 kJ/mol
C)  50.7 kJ/mol
D)  160.kJ/mol
E)  269 kJ/mol

Question 8

For the following reaction,ΔP(C6H14) /Δt was found to be -6.2 × 10-3 atm/s. C6H14(g) → C6H6(g) + 4H2(g) 
Determine ΔP(H2) /Δt for this reaction at the same time.

Accepted Answer

A)  6.2 × 10-3 atm/s
B)  1.6 × 10-3 atm/s
C)  2.5 × 10-2 atm/s
D)  -1.6 × 10-3 atm/s
E)  -2.5 × 10-2 atm/s

Question 9

A reaction has the following rate law: rate = k[A][B]2
In experiment 1,the concentrations of A and B are both 0.10 mol • L-1; in experiment 2,the concentrations are both 0.30 mol • L-1.If the temperature stays constant,what is the value of the ratio,rate(2) /rate(1) ?

Accepted Answer

A)  3.0
B)  6.0
C)  9.0
D)  18
E)  27

Question 10

The rate law cannot be predicted from the stoichiometry of a reaction.

Accepted Answer

A) True 
 B)False

Question 11

What is the integrated rate law for a first-order reaction?

Accepted Answer

A)  rate = k[A]t
B)   
C)   
D)   
E)

Question 12

Below is a plot of the reaction of A decomposing to form products.  Based on the figure,which might be the order of the reaction with respect to A?

Accepted Answer

A)  The reaction must only be zeroth order in A.
B)  The reaction must only be first order in A.
C)  The reaction must only be second order in A.
D)  The reaction could be either first order in A or second order in A.
E)  The reaction could be of any order in A.

Question 13

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr-1.What fraction of the tritium initially in a sample is still present 30.years later?

Accepted Answer

A)  0.19
B)  0.60
C)  0.15
D)  2.8 × 10-38
E)  0.81

Question 14

For a second-order reaction,if [A]-1 is plotted vs.time,which corresponds to the slope of this plot?

Accepted Answer

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

Question 15

The activation energy for the following first-order reaction is 102 kJ/mol. N2O5(g) → 2NO2(g) + (1/2) O2(g) 
The value of the rate constant (k) is 1.35 × 10-4 s-1 at 35°C.What is the value of k at 0°C? (R =8.314 J/mol• K)

Accepted Answer

A)  8.2 × 10-7 s-1
B)  1.9 × 10-5 s-1
C)  4.2 × 10-5 s-1
D)  2.2 × 10-2 s-1
E)  1.2 × 106 s-1

Question 16

The first-order reaction SO2Cl2→ SO2 + Cl2 is 10% complete in 80.min.How long would it take for the reaction to be 95% complete?

Accepted Answer

A)  1.8 min
B)  104 min
C)  530 min
D)  2300 min
E)  990 min

Question 17

When [OH-] doubles,the rate doubles.

Accepted Answer

A)  The reaction is first order with respect to CH3Cl
B)  The reaction is first order with respect to OH-.
C)  The reaction is second order overall
D)  All of the answers are correct.

Question 18

What is the slope of a plot of ln k vs.1/T for the Arrhenius equation k = Ae-(Ea/RT) ?

Accepted Answer

A)  A
B)  -k
C)  -Ea/R
D)  k
E)  Ea

Question 19

Which is the correct unit for a zeroth-order rate constant?

Accepted Answer

A)  s-1
B)  M • s-1
C)  M • s
D)  M-1 • s-1
E)  M-2 • s-1

Question 20

kJ/mol. Sn2+ + 2Co3+ → Sn4+ + 2Co2+
By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Accepted Answer

A)  1.002
B)  4.6
C)  5.6
D)  2.8
E)  696

Exam 14: Chemical Kinetics

kJ/mol. Sn2+ + 2Co3+ → Sn4+ + 2Co2+ By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

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Consider the general reaction 5Br-(aq) + Br O3-(aq) + 6H+(aq) → 3Br2(aq) + 3 H2O(aq) For this reaction,which is equal to Δ[Br2]/Δt?

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Consider the following potential energy profile for the A → B reaction.Assuming that the frequency factor for the reaction is 5.5×1010 s-1,what is the rate constant of this first-order reaction at 310 K?

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What is the half-life for a second-order reaction?

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Below is a plot of the reaction of A decomposing to form products. Based on the figure,which might be the order of the reaction with respect to A?

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For the following reaction,ΔP(C6H14) /Δt was found to be -6.2 × 10-3 atm/s. C6H14(g) → C6H6(g) + 4H2(g) Determine ΔP(H2) /Δt for this reaction at the same time.

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The step of the reaction mechanism which is the slowest step is called _______-________.

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The activation energy for the following first-order reaction is 102 kJ/mol. N2O5(g) → 2NO2(g) + (1/2) O2(g) The value of the rate constant (k) is 1.35 × 10-4 s-1 at 35°C.What is the value of k at 0°C? (R =8.314 J/mol• K)

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Which is the correct unit for a zeroth-order rate constant?

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The rate of a ________-_________________ is a constant that is independent of reactant concentration.

Correct Answerverifiedzeroth-ord...View AnswerShow Answer

What is the integrated rate law for a first-order reaction?

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When [OH-] doubles,the rate doubles.

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A reaction has the following rate law: rate = k[A][B]2 In experiment 1,the concentrations of A and B are both 0.10 mol • L-1; in experiment 2,the concentrations are both 0.30 mol • L-1.If the temperature stays constant,what is the value of the ratio,rate(2) /rate(1) ?

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For a second-order reaction,if [A]-1 is plotted vs.time,which corresponds to the slope of this plot?

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The rate law cannot be predicted from the stoichiometry of a reaction.

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The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr-1.What fraction of the tritium initially in a sample is still present 30.years later?

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What is the integrated rate law for a second-order reaction?

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What is the slope of a plot of ln k vs.1/T for the Arrhenius equation k = Ae-(Ea/RT) ?

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The first-order reaction SO2Cl2→ SO2 + Cl2 is 10% complete in 80.min.How long would it take for the reaction to be 95% complete?

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The isomerization of cyclopropane follows first-order kinetics.The rate constant at 700.K is 6.20 × 10-4 min-1,and the half-life at 760.K is 29.0 min.What is the activation energy for this reaction? (R = 8.314 J/mol• K)

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kJ/mol. Sn²⁺ + 2Co³⁺ → Sn₄⁺ + 2Co²⁺ By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Correct Answer
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Consider the general reaction 5Br-(aq) + Br O₃-(aq) + 6H+(aq) → 3Br₂(aq) + 3 H₂O(aq) For this reaction,which is equal to Δ[Br2]/Δt?

Correct Answer
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Consider the following potential energy profile for the A → B reaction.Assuming that the frequency factor for the reaction is 5.5×10¹⁰ s^-1,what is the rate constant of this first-order reaction at 310 K?

Correct Answer
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Correct Answer
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Correct Answer
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For the following reaction,ΔP(C₆H₁₄) /Δt was found to be -6.2 × 10^-3 atm/s. C₆H₁₄(g) → C₆H₆(g) + 4H₂(g) Determine ΔP(H₂) /Δt for this reaction at the same time.

Correct Answer
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The step of the reaction mechanism which is the slowest step is called _-__.

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The activation energy for the following first-order reaction is 102 kJ/mol. N₂O₅(g) → 2NO₂(g) + (1/2) O₂(g) The value of the rate constant (k) is 1.35 × 10^-4 s^-1 at 35°C.What is the value of k at 0°C? (R =8.314 J/mol• K)

Correct Answer
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Correct Answer
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The rate of a -_________ is a constant that is independent of reactant concentration.

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zeroth-ord...
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When [OH^-] doubles,the rate doubles.

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A reaction has the following rate law: rate = k[A][B]² In experiment 1,the concentrations of A and B are both 0.10 mol • L^-1; in experiment 2,the concentrations are both 0.30 mol • L^-1.If the temperature stays constant,what is the value of the ratio,rate(2) /rate(1) ?

Correct Answer
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For a second-order reaction,if [A]^-1 is plotted vs.time,which corresponds to the slope of this plot?

Correct Answer
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Correct Answer
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The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr^-1.What fraction of the tritium initially in a sample is still present 30.years later?

Correct Answer
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Correct Answer
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What is the slope of a plot of ln k vs.1/T for the Arrhenius equation k = Ae^-(^E^a/^RT⁾?

Correct Answer
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The first-order reaction SO₂Cl₂→ SO₂ + Cl₂ is 10% complete in 80.min.How long would it take for the reaction to be 95% complete?

Correct Answer
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The isomerization of cyclopropane follows first-order kinetics.The rate constant at 700.K is 6.20 × 10^-4 min^-1,and the half-life at 760.K is 29.0 min.What is the activation energy for this reaction? (R = 8.314 J/mol• K)

Correct Answer
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