Question 1

Below is a proposed mechanism for the decomposition of H2O2.
H2O2 + I-  →	o→  H2O + IO-          ~~~~~~~~                   ~~~~~~~~          slow

H2O2 + IO-  →	o→ H2O + O2 + I-          ~~~~~~~~             ~ ~    Fast
Which of the following statements is   incorrect? ‾\underline{	ext{ incorrect? }} incorrect? ​

Accepted Answer

A)   IO- is a catalyst.
B)   I- is a catalyst.
C)   The net reaction is 2H2O2  →	o→ 2H2O + O2.
D)   The reaction is first-order with respect to [I-].
E)   The reaction is first-order with respect to [H2O2].

Question 2

Elementary steps in a reaction mechanism often include reaction ________.These (usually)short-lived species,which are at one point produced and then later consumed,do not appear in the overall chemical reaction.

Accepted Answer

The answer of Elementary steps in a reaction mechanism often...

Question 3

Which of the following units are consistent with the units of the reaction rate in a first order reaction?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 4

For the first-order decomposition of N2O5 at a high temperature,determine the rate constant if the N2O5 concentration decreases from 1.04 M to 0.62 M in 375 seconds.

Accepted Answer

A)   5.99  ×	imes×  10-4 s-1
B)   1.59  ×	imes×  10-3 s-1
C)   1.74  ×	imes×  10-3 s-1
D)   1.38  ×	imes×  10-3 s-1
E)   1.94  ×	imes×  102 s-1

Question 5

The reaction,A + 2B  →	o→  B2 + A,proceeds by the following mechanism: (A is a catalyst.) 
A + B  →	o→  AB          ~~~~~~~~                   ~~~~~~~~          (slow) 
AB + B  →	o→  B2 + A            ~~~~~~~~~~            (fast) 
What is the rate law expression for this reaction?

Accepted Answer

A)   Rate = k[A]
B)   Rate = k[B]
C)   Rate = k[A][B]
D)   Rate = k[A][B]2
E)   Rate = k[A]2[B]

Question 6

How are the exponents in a rate law determined?

Accepted Answer

A)   They are equal to the inverse of the coefficients in the overall balanced chemical equation.
B)   They are determined by experimentation.
C)   They are equal to the coefficients in the overall balanced chemical equation.
D)   They are equal to the reactant concentrations.
E)   They are equal to the ln(2) divided by the rate constant.

Question 7

What is the half-life of a first-order reaction if it takes 4.4  ×	imes×  10-2 seconds for the concentration to decrease from 0.50 M to 0.20 M?

Accepted Answer

A)   2.5  ×	imes×  10-2 s
B)   3.3  ×	imes×  10-2 s
C)   1.6 s
D)   21 s
E)   27 s  B

Question 8

A first-order chemical reaction is observed to have a rate constant of 34 min-1.What is the corresponding half-life for the reaction?

Accepted Answer

A)   1.2 s
B)   1.2 min
C)   49 min
D)   1.8 s
E)   48.6 s

Question 9

What is the overall order of the reaction below
NO(g) + O3(g)  →	o→  NO2(g) + O2(g) 
If it proceeds via the following rate expression? 3(g)  	o  NO2(g) + O2(g)  If it proceeds via the following rate expression?   A)  zero-order B)  first-order C)  second-order D)  third-order E)  fourth-order " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   zero-order
B)   first-order
C)   second-order
D)   third-order
E)   fourth-order  C

Question 10

A catalyst ____.

Accepted Answer

A)   is used up in a chemical reaction
B)   changes the potential energy change of the reaction
C)   is always a solid
D)   does not influence the reaction in any way
E)   changes the activation energy of the reaction

Question 11

Nitrogen dioxide reacts with carbon monoxide to produce nitrogen monoxide and carbon dioxide.
NO2(g) + CO(g)  →	o→  NO(g) + CO2(g) 
A proposed mechanism for this reaction is
2(g) + CO(g)  	o  NO(g) + CO2(g)  A proposed mechanism for this reaction is   What is a rate law that is consistent with the proposed mechanism? A)  rate = k[NO2]2[CO] [NO]-1 B)  rate = k[NO2]2[CO] C)  rate = k[NO2][CO] D)  rate = k[NO3][CO] E)  rate = k[NO2]2 " class="answers-bank-image d-inline" rel="preload" >
What is a rate law that is consistent with the proposed mechanism?

Accepted Answer

A)   rate = k[NO2]2[CO] [NO]-1
B)   rate = k[NO2]2[CO]
C)   rate = k[NO2][CO]
D)   rate = k[NO3][CO]
E)   rate = k[NO2]2

Question 12

In general,as temperature increases,the rate of a chemical reaction

Accepted Answer

A)   decreases due to fewer collisions with proper molecular orientation.
B)   increases for exothermic reactions,but decreases for endothermic reactions.
C)   increases due to a greater number of effective collisions.
D)   remains unchanged.
E)   decreases due to an increase in the activation energy.

Question 13

A possible mechanism for the gas phase reaction of NO and H2 is as follows:
2 is as follows:   Which of the following statements concerning this mechanism is not directly supported by the information provided? A)  Step 1 is the rate determining step. B)  N2O2 is an intermediate. C)  There is no catalyst in this reaction. D)  The rate expression for step 1 is rate = k[NO]2. E)  All steps are bimolecular reactions." class="answers-bank-image d-inline" rel="preload" >
Which of the following statements concerning this mechanism is not directly supported by the information provided?

Accepted Answer

A)   Step 1 is the rate determining step.
B)   N2O2 is an intermediate.
C)   There is no catalyst in this reaction.
D)   The rate expression for step 1 is rate = k[NO]2.
E)   All steps are bimolecular reactions.

Question 14

The reactants A and B are mixed,and the reaction is timed until a color change occurs.The data are as follows:

The order of the reaction with respect to reactant A is

Accepted Answer

A)   2.
B)    .
C)   1.
D)    .
E)   0.

Question 15

The ________ of an elementary step is defined as the number of reactant molecules that come together in the reaction.

Accepted Answer

The answer of The ________ of an elementary step is...

Question 16

Given the initial rate data for the reaction A + B  →	o→  C,determine the rate expression for the reaction.

Accepted Answer

A)   
B)   
C)   
D)   
E)     E

Question 17

For the second-order reaction below,the initial concentration of reactant A is 0.24 M.If the rate constant for the reaction is 1.5  ×	imes×  10-2  M-1s-1,what is the concentration of A after 265 seconds?
2A  →	o→  B + C          ~~~~~~~~          rate = k[A]2

Accepted Answer

A)   0.12 M
B)   0.19 M
C)   0.95 M
D)   4.0 M
E)   5.2 M

Question 18

For the reaction 2A + B  →	o→ C,the rate law is
  .
Which of the factor(s) will affect the value of the   rate constant ‾\underline{	ext{ rate constant }} rate constant ​   for this reaction?
1) decreasing the temperature
2) adding a catalyst
3) decreasing the concentration of reactant A

Accepted Answer

A)   1 only
B)   2 only
C)   3 only
D)   1 and 2
E)   2 and 3

Question 19

The average rate of disappearance of ozone in the following reaction is found to be  atm/s E)    atm/s" class="answers-bank-image d-inline" rel="preload" > atm/s.  atm/s E)    atm/s" class="answers-bank-image d-inline" rel="preload" >
What is the rate of appearance of  atm/s E)    atm/s" class="answers-bank-image d-inline" rel="preload" >
During this interval?

Accepted Answer

A)    atm/s 
E)     atm/s" class="answers-bank-image d-inline" rel="preload" > atm/s
B)    atm/s 
E)     atm/s" class="answers-bank-image d-inline" rel="preload" > atm/s
C)    atm/s 
E)     atm/s" class="answers-bank-image d-inline" rel="preload" > atm/s
D)    atm/s 
E)     atm/s" class="answers-bank-image d-inline" rel="preload" >  atm/s
E)    atm/s 
E)     atm/s" class="answers-bank-image d-inline" rel="preload" > atm/s

Question 20

The rate constant for a particular reaction is 0.0040 M.s-1.What is the overall order of this reaction?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4

Exam 15: Chemical Kinetics: the Rates of Chemical Reactions

Below is a proposed mechanism for the decomposition of H₂O₂. H₂O₂ + I^- $\to$ H₂O + IO^- $$ $$ slow H₂O₂ + IO^- $\to$ H₂O + O₂ + I^- $$ $~ ~$ Fast Which of the following statements is $\underline{\text{ incorrect? }}$

Correct Answer
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Elementary steps in a reaction mechanism often include reaction ________.These (usually)short-lived species,which are at one point produced and then later consumed,do not appear in the overall chemical reaction.

Correct Answer
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Which of the following units are consistent with the units of the reaction rate in a first order reaction?

Correct Answer
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For the first-order decomposition of N₂O₅ at a high temperature,determine the rate constant if the N₂O₅ concentration decreases from 1.04 M to 0.62 M in 375 seconds.

Correct Answer
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The reaction,A + 2B $\to$ B₂ + A,proceeds by the following mechanism: (A is a catalyst.) A + B $\to$ AB $$ $$ (slow) AB + B $\to$ B₂ + A $~~$ (fast) What is the rate law expression for this reaction?

Correct Answer
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How are the exponents in a rate law determined?

Correct Answer
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What is the half-life of a first-order reaction if it takes 4.4 $\times$ 10^-2 seconds for the concentration to decrease from 0.50 M to 0.20 M?

Correct Answer
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B

A first-order chemical reaction is observed to have a rate constant of 34 min^-1.What is the corresponding half-life for the reaction?

Correct Answer
verified

Correct Answer
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C

A catalyst ____.

Correct Answer
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Correct Answer
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In general,as temperature increases,the rate of a chemical reaction

Correct Answer
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A possible mechanism for the gas phase reaction of NO and H₂ is as follows: Which of the following statements concerning this mechanism is not directly supported by the information provided?

Correct Answer
verified

The reactants A and B are mixed,and the reaction is timed until a color change occurs.The data are as follows: The order of the reaction with respect to reactant A is

Correct Answer
verified

The ________ of an elementary step is defined as the number of reactant molecules that come together in the reaction.

Correct Answer
verified

Given the initial rate data for the reaction A + B $\to$ C,determine the rate expression for the reaction. $Given the initial rate data for the reaction A + B \to C,determine the rate expression for the reaction. A) B) C) D) E)$

Correct Answer
verified
E

For the second-order reaction below,the initial concentration of reactant A is 0.24 M.If the rate constant for the reaction is 1.5 $\times$ 10^-2 M^-1s^-1,what is the concentration of A after 265 seconds? 2A $\to$ B + C $~~~~~~~~$ rate = k[A]²

Correct Answer
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Correct Answer
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The average rate of disappearance of ozone in the following reaction is found to be atm/s. What is the rate of appearance of During this interval?

Correct Answer
verified

The rate constant for a particular reaction is 0.0040 M.s^-1.What is the overall order of this reaction?

Correct Answer
verified

Exam 15: Chemical Kinetics: the Rates of Chemical Reactions

Below is a proposed mechanism for the decomposition of H2O2. H2O2 + I- →\to→ H2O + IO- ~~~~~~~~ ~~~~~~~~ slow H2O2 + IO- →\to→ H2O + O2 + I- ~~~~~~~~ ~ ~ Fast Which of the following statements is incorrect? ‾\underline{\text{ incorrect? }} incorrect? ​

Correct AnswerverifiedShow Answer

Elementary steps in a reaction mechanism often include reaction ________.These (usually)short-lived species,which are at one point produced and then later consumed,do not appear in the overall chemical reaction.

Correct AnswerverifiedShow Answer

Which of the following units are consistent with the units of the reaction rate in a first order reaction?

Correct AnswerverifiedShow Answer

For the first-order decomposition of N2O5 at a high temperature,determine the rate constant if the N2O5 concentration decreases from 1.04 M to 0.62 M in 375 seconds.

Correct AnswerverifiedShow Answer

The reaction,A + 2B →\to→ B2 + A,proceeds by the following mechanism: (A is a catalyst.) A + B →\to→ AB ~~~~~~~~ ~~~~~~~~ (slow) AB + B →\to→ B2 + A ~~~~~~~~~~ (fast) What is the rate law expression for this reaction?

Correct AnswerverifiedShow Answer

How are the exponents in a rate law determined?

Correct AnswerverifiedShow Answer

What is the half-life of a first-order reaction if it takes 4.4 ×\times× 10-2 seconds for the concentration to decrease from 0.50 M to 0.20 M?

Correct AnswerverifiedB

A first-order chemical reaction is observed to have a rate constant of 34 min-1.What is the corresponding half-life for the reaction?

Correct AnswerverifiedShow Answer

What is the overall order of the reaction below NO(g) + O3(g) →\to→ NO2(g) + O2(g) If it proceeds via the following rate expression?

Correct AnswerverifiedC

A catalyst ____.

Correct AnswerverifiedShow Answer

Nitrogen dioxide reacts with carbon monoxide to produce nitrogen monoxide and carbon dioxide. NO2(g) + CO(g) →\to→ NO(g) + CO2(g) A proposed mechanism for this reaction is What is a rate law that is consistent with the proposed mechanism?

Correct AnswerverifiedShow Answer

In general,as temperature increases,the rate of a chemical reaction

Correct AnswerverifiedShow Answer

A possible mechanism for the gas phase reaction of NO and H2 is as follows: Which of the following statements concerning this mechanism is not directly supported by the information provided?

Correct AnswerverifiedShow Answer

The reactants A and B are mixed,and the reaction is timed until a color change occurs.The data are as follows: The order of the reaction with respect to reactant A is

Correct AnswerverifiedShow Answer

The ________ of an elementary step is defined as the number of reactant molecules that come together in the reaction.

Correct AnswerverifiedShow Answer

Given the initial rate data for the reaction A + B →\to→ C,determine the rate expression for the reaction.

Correct AnswerverifiedE

For the second-order reaction below,the initial concentration of reactant A is 0.24 M.If the rate constant for the reaction is 1.5 ×\times× 10-2 M-1s-1,what is the concentration of A after 265 seconds? 2A →\to→ B + C ~~~~~~~~ rate = k[A]2

Correct AnswerverifiedShow Answer

For the reaction 2A + B →\to→ C,the rate law is . Which of the factor(s) will affect the value of the rate constant ‾\underline{\text{ rate constant }} rate constant ​ for this reaction? 1) decreasing the temperature 2) adding a catalyst 3) decreasing the concentration of reactant A

Correct AnswerverifiedShow Answer

The average rate of disappearance of ozone in the following reaction is found to be atm/s. What is the rate of appearance of During this interval?

Correct AnswerverifiedShow Answer

The rate constant for a particular reaction is 0.0040 M.s-1.What is the overall order of this reaction?

Correct AnswerverifiedShow Answer

Below is a proposed mechanism for the decomposition of H₂O₂. H₂O₂ + I^- $\to$ H₂O + IO^- $$ $$ slow H₂O₂ + IO^- $\to$ H₂O + O₂ + I^- $$ $~ ~$ Fast Which of the following statements is $\underline{\text{ incorrect? }}$

Correct Answer
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Correct Answer
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Correct Answer
verified

For the first-order decomposition of N₂O₅ at a high temperature,determine the rate constant if the N₂O₅ concentration decreases from 1.04 M to 0.62 M in 375 seconds.

Correct Answer
verified

The reaction,A + 2B $\to$ B₂ + A,proceeds by the following mechanism: (A is a catalyst.) A + B $\to$ AB $$ $$ (slow) AB + B $\to$ B₂ + A $~~$ (fast) What is the rate law expression for this reaction?

Correct Answer
verified

Correct Answer
verified

What is the half-life of a first-order reaction if it takes 4.4 $\times$ 10^-2 seconds for the concentration to decrease from 0.50 M to 0.20 M?

Correct Answer
verified
B

A first-order chemical reaction is observed to have a rate constant of 34 min^-1.What is the corresponding half-life for the reaction?

Correct Answer
verified

Correct Answer
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C

Correct Answer
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Correct Answer
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Correct Answer
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A possible mechanism for the gas phase reaction of NO and H₂ is as follows: Which of the following statements concerning this mechanism is not directly supported by the information provided?

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Given the initial rate data for the reaction A + B $\to$ C,determine the rate expression for the reaction. $Given the initial rate data for the reaction A + B \to C,determine the rate expression for the reaction. A) B) C) D) E)$

Correct Answer
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E

For the second-order reaction below,the initial concentration of reactant A is 0.24 M.If the rate constant for the reaction is 1.5 $\times$ 10^-2 M^-1s^-1,what is the concentration of A after 265 seconds? 2A $\to$ B + C $~~~~~~~~$ rate = k[A]²

Correct Answer
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Correct Answer
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Correct Answer
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The rate constant for a particular reaction is 0.0040 M.s^-1.What is the overall order of this reaction?

Correct Answer
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