Question 1

An elementary reaction is a simple,one-step process.

Accepted Answer

A) True 
 B)False

Question 2

A study of the decomposition reaction 3RS2  →	o→  3R + 6S yields the following initial rate data
2  	o  3R + 6S yields the following initial rate data   What is the rate constant for the reaction? A) 0.0103 L mol-1s-1 B) 0.263 L mol-1s-1 C) 0.571 L mol-1s-1 D) 1.17 L mol-1s-1 E) 1.75 L mol-1s-1 " class="answers-bank-image d-inline" rel="preload" >
What is the rate constant for the reaction?

Accepted Answer

A)  0.0103 L mol-1s-1
B)  0.263 L mol-1s-1
C)  0.571 L mol-1s-1
D)  1.17 L mol-1s-1
E)  1.75 L mol-1s-1 F) A) and C)
G) D) and E)

Question 3

The greater the energy of activation,Ea,the faster will be the reaction.

Accepted Answer

A) True 
 B)False

Question 4

The rate law for the reaction 3A  →	o→  2B is rate = k[A] with a rate constant of 0.0447 hr-1.What is the half-life of the reaction?

Accepted Answer

A)  0.0224 hr
B)  0.0645 hr
C)  15.5 hr
D)  22.4 hr
E)  44.7 hr F) B) and D)
G) A) and D)

Question 5

In the gas phase at 500.°C,cyclopropane reacts to form propene in a first-order reaction.The figure shows the natural logarithm of the concentration of cyclopropane (in mol/L)plotted versus time.
a.Explain how this plot confirms that the reaction is first order.
b.Calculate the first-order rate constant,k.
c.Determine the initial concentration of cyclopropane in this experiment.

Accepted Answer

a.The fact that a plot of ln [cyclopropa...

Question 6

The gas-phase conversion of 1,3-butadiene to 1,5-cyclooctadiene,2C4H6 $\to$ C8H12 was studied,providing data for the plot shown below,of 1/[butadiene] versus time.
a.Explain how this plot confirms that the reaction is second order.
b.Calculate the second-order rate constant,k.
c.Determine the initial concentration of 1,3-butadiene in this experiment.

Accepted Answer

a.The fact that a plot of 1/[butadiene] ...

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

For the reaction
2A + B + 2C  →	o→  D + E
The following initial rate data was collected at constant temperature.Determine the correct rate law for this reaction.All units are arbitrary.
2[B][C] C) Rate = k [A]2[B][C]-1 D) Rate = k [A][B]2[C] -1 E) None of these choices is correct. " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Rate = k [A][B][C]
B)  Rate = k [A]2[B][C]
C)  Rate = k [A]2[B][C]-1
D)  Rate = k [A][B]2[C] -1
E)  None of these choices is correct. F) B) and C)
G) B) and D)

Question 9

Tetrafluoroethylene,C2F4,can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant.A plot of 1/[C2F4] vs.time gives a straight line with a slope of 0.0448 L mol-1s-1.What is the rate law for this reaction?

Accepted Answer

A)  Rate = 0.0448 (L mol-1s-1) [C2F4]
B)  Rate = 22.3 (mol L-1s) [C2F4]
C)  Rate = 0.0448 (L mol-1s-1) [C2F4]2
D)  Rate = 22.3 (mol L-1s) [C2F4]2
E)  Rate = 0.0448 s-1 [C2F4]F) All of the above
G) C) and D)

Question 10

Consider the reaction
2NH3(g)   →	o→  N2(g) + 3H2(g) 
If the rate  Δ\DeltaΔ [H2]/ Δ\DeltaΔ t is 0.030 mol L-1 s-1,then  Δ\DeltaΔ [NH3]/ Δ\DeltaΔ t is

Accepted Answer

A)  -0.045 mol L-1 s-1
B)  -0.030 mol L-1 s-1
C)  -0.020 mol L-1 s-1
D)  -0.010 mol L-1 s-1
E)  None of these choices is correct. F) B) and C)
G) C) and D)

Question 11

When the reaction A  →	o→  B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction?

Accepted Answer

A)  zero
B)  first
C)  second
D)  third
E)  More information is needed to determine the order. F) A) and B)
G) C) and D)

Question 12

The decomposition of SOCl2 is first-order in SOCl2.If the half-life for the reaction is 4.1 hr,how long would it take for the concentration of SOCl2 to drop from 0.36 M to 0.045 M?

Accepted Answer

A)  0.52 hr
B)  1.4 hr
C)  12 hr
D)  33 hr
E)  > 40 hrF) B) and D)
G) B) and C)

Question 13

The elementary reaction HBr(g)+ Br(g) $\to$ H(g)+ Br2(g)is endothermic.
a.Would you expect the rate constant for the back reaction to be smaller or larger than that for the forward reaction? Explain,briefly.
b.Draw a fully-labeled reaction energy diagram for this reaction,showing the locations of the reactants,products and transition state.

Accepted Answer

a.The back reaction is exothermic.Since ...

Question 14

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Accepted Answer

A) True 
 B)False

Question 15

The half-life of a first-order reaction does not depend on the initial concentration of reactant.

Accepted Answer

A) True 
 B)False

Question 16

The units of the rate constant depend on the order of the reaction.

Accepted Answer

A) True 
 B)False

Question 17

In the gas phase at 500.°C,cyclopropane reacts to form propene in a first-order reaction.The figure below shows the concentration of cyclopropane plotted versus time.Use the graph to calculate approximate values of
a.the rate of the reaction,600.seconds after the start.
b.the half-life of the reaction,t1/2.

Accepted Answer

a.Rate = - slope = 6 ± 1 <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> 10<s...

Question 18

Which of the following sets of units could be appropriate for a zero-order rate constant?

Accepted Answer

A)  s-1
B)  L mol-1 s-1
C)  L2 mol-2 s-1
D)  L3 mol-3 s-1
E)  mol L-1 s-1F) B) and C)
G) B) and D)

Question 19

A first-order reaction has a half-life of 20.0 minutes.Starting with 1.00  ×	imes×  1020 molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

Accepted Answer

A)  1.00  ×	imes×  104 molecules
B)  2.00  ×	imes×  1019 molecules
C)  3.20  ×	imes×  1016 molecules
D)  5.00  ×	imes×  1020 molecules
E)  None of these choices is correct. F) D) and E)
G) B) and C)

Question 20

The rate law for the reaction 3A  →	o→  C is
Rate = 4.36  ×	imes×  10-2 L mol-1 hr-1[A]2
 What is the half-life for the reaction if the initial concentration of A is 0.250 M?

Accepted Answer

A)  0.0109 hr
B)  0.0629 hr
C)  15.9 hr
D)  23.9 hr
E)  91.7 hr F) None of the above
G) A) and B)

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The greater the energy of activation,E_a,the faster will be the reaction.

Correct Answer
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Correct Answer
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Correct Answer
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a.The fact that a plot of 1/[butadiene] ...
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The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Correct Answer
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Correct Answer
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When the reaction A $\to$ B + C is studied,a plot of ln[A]_t vs.time gives a straight line with a negative slope.What is the order of the reaction?

Correct Answer
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Which of the following sets of units could be appropriate for a zero-order rate constant?

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

Correct Answer
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Correct Answer
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a.The fact that a plot of ln [cyclopropa...
View Answer

A first-order reaction has a half-life of 20.0 minutes.Starting with 1.00 $\times$ 10²⁰ molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

Correct Answer
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The decomposition of SOCl₂ is first-order in SOCl₂.If the half-life for the reaction is 4.1 hr,how long would it take for the concentration of SOCl₂ to drop from 0.36 M to 0.045 M?

Correct Answer
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Tetrafluoroethylene,C₂F₄,can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant.A plot of 1/[C₂F₄] vs.time gives a straight line with a slope of 0.0448 L mol^-1s^-1.What is the rate law for this reaction?

Correct Answer
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The rate law for the reaction 3A $\to$ C is Rate = 4.36 $\times$ 10^-2 L mol^-1 hr^-1[A]² What is the half-life for the reaction if the initial concentration of A is 0.250 M?

Correct Answer
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Correct Answer
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a.Rate = - slope = 6 ± 1 10
View Answer

Correct Answer
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a.The back reaction is exothermic.Since ...
View Answer

Consider the reaction 2NH₃(g) $\to$ N₂(g) + 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L^-1 s^-1,then $\Delta$ [NH₃]/ $\Delta$ t is

Correct Answer
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The units of the rate constant depend on the order of the reaction.

Correct Answer
verified

An elementary reaction is a simple,one-step process.

Correct Answer
verified

The half-life of a first-order reaction does not depend on the initial concentration of reactant.

Correct Answer
verified

The rate law for the reaction 3A $\to$ 2B is rate = k[A] with a rate constant of 0.0447 hr^-1.What is the half-life of the reaction?

Correct Answer
verified

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The greater the energy of activation,Ea,the faster will be the reaction.

Correct AnswerverifiedShow Answer

For the reaction 2A + B + 2C →\to→ D + E The following initial rate data was collected at constant temperature.Determine the correct rate law for this reaction.All units are arbitrary.

Correct AnswerverifiedShow Answer

Correct Answerverifieda.The fact that a plot of 1/[butadiene] ...View AnswerShow Answer

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Correct AnswerverifiedShow Answer

A study of the decomposition reaction 3RS2 →\to→ 3R + 6S yields the following initial rate data What is the rate constant for the reaction?

Correct AnswerverifiedShow Answer

When the reaction A →\to→ B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction?

Correct AnswerverifiedShow Answer

Which of the following sets of units could be appropriate for a zero-order rate constant?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answerverifieda.The fact that a plot of ln [cyclopropa...View AnswerShow Answer

A first-order reaction has a half-life of 20.0 minutes.Starting with 1.00 ×\times× 1020 molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

Correct AnswerverifiedShow Answer

The decomposition of SOCl2 is first-order in SOCl2.If the half-life for the reaction is 4.1 hr,how long would it take for the concentration of SOCl2 to drop from 0.36 M to 0.045 M?

Correct AnswerverifiedShow Answer

Tetrafluoroethylene,C2F4,can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant.A plot of 1/[C2F4] vs.time gives a straight line with a slope of 0.0448 L mol-1s-1.What is the rate law for this reaction?

Correct AnswerverifiedShow Answer

The rate law for the reaction 3A →\to→ C is Rate = 4.36 ×\times× 10-2 L mol-1 hr-1[A]2 What is the half-life for the reaction if the initial concentration of A is 0.250 M?

Correct AnswerverifiedShow Answer

Correct Answerverifieda.Rate = - slope = 6 ± 1 10View AnswerShow Answer

Correct Answerverifieda.The back reaction is exothermic.Since ...View AnswerShow Answer

Consider the reaction 2NH3(g) →\to→ N2(g) + 3H2(g) If the rate Δ\DeltaΔ [H2]/ Δ\DeltaΔ t is 0.030 mol L-1 s-1,then Δ\DeltaΔ [NH3]/ Δ\DeltaΔ t is

Correct AnswerverifiedShow Answer

The units of the rate constant depend on the order of the reaction.

Correct AnswerverifiedShow Answer

An elementary reaction is a simple,one-step process.

Correct AnswerverifiedShow Answer

The half-life of a first-order reaction does not depend on the initial concentration of reactant.

Correct AnswerverifiedShow Answer

The rate law for the reaction 3A →\to→ 2B is rate = k[A] with a rate constant of 0.0447 hr-1.What is the half-life of the reaction?

Correct AnswerverifiedShow Answer

The greater the energy of activation,E_a,the faster will be the reaction.

Correct Answer
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Correct Answer
verified

Correct Answer
verified
a.The fact that a plot of 1/[butadiene] ...
View Answer

Correct Answer
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Correct Answer
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When the reaction A $\to$ B + C is studied,a plot of ln[A]_t vs.time gives a straight line with a negative slope.What is the order of the reaction?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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a.The fact that a plot of ln [cyclopropa...
View Answer

A first-order reaction has a half-life of 20.0 minutes.Starting with 1.00 $\times$ 10²⁰ molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

Correct Answer
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The decomposition of SOCl₂ is first-order in SOCl₂.If the half-life for the reaction is 4.1 hr,how long would it take for the concentration of SOCl₂ to drop from 0.36 M to 0.045 M?

Correct Answer
verified

Tetrafluoroethylene,C₂F₄,can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant.A plot of 1/[C₂F₄] vs.time gives a straight line with a slope of 0.0448 L mol^-1s^-1.What is the rate law for this reaction?

Correct Answer
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The rate law for the reaction 3A $\to$ C is Rate = 4.36 $\times$ 10^-2 L mol^-1 hr^-1[A]² What is the half-life for the reaction if the initial concentration of A is 0.250 M?

Correct Answer
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Correct Answer
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a.Rate = - slope = 6 ± 1 10
View Answer

Correct Answer
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a.The back reaction is exothermic.Since ...
View Answer

Consider the reaction 2NH₃(g) $\to$ N₂(g) + 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L^-1 s^-1,then $\Delta$ [NH₃]/ $\Delta$ t is

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The rate law for the reaction 3A $\to$ 2B is rate = k[A] with a rate constant of 0.0447 hr^-1.What is the half-life of the reaction?

Correct Answer
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