Question 1

The reaction 2NO + O2  →	o→  2NO2 obeys the rate law - 2  	o  2NO2 obeys the rate law -   = kobsd[NO]2[O2]. Which of the following mechanisms is consistent with the experimental rate law? A) NO + NO  	o  N2O2 (slow) N2O2 + O2  	o  2NO2  (fast)  B) NO + O2     NO3 (fast equilibrium) NO3 + NO  	o  2NO2  (slow)  C) 2NO   N2O2 (fast equilibrium) N2O2  	o  NO2 + O (slow) NO + O  	o  NO2 (fast)  D) O2 + O2  	o  O2 + O2  (slow) O2 + NO  	o  NO2 + O (fast) O + NO  	o  NO2  (fast)  E) none of these " class="answers-bank-image d-inline" rel="preload" > = kobsd[NO]2[O2]. Which of the following mechanisms is consistent with the experimental rate law?

Accepted Answer

A)  NO + NO  →	o→  N2O2 (slow) N2O2 + O2  →	o→  2NO2  (fast) 
B)  NO + O2   2  	o  2NO2 obeys the rate law -   = kobsd[NO]2[O2]. Which of the following mechanisms is consistent with the experimental rate law? 
A)  NO + NO  	o  N2O2 (slow) N2O2 + O2  	o  2NO2  (fast)  
B)  NO + O2     NO3 (fast equilibrium) NO3 + NO  	o  2NO2  (slow)  
C)  2NO   N2O2 (fast equilibrium) N2O2  	o  NO2 + O (slow) NO + O  	o  NO2 (fast)  
D)  O2 + O2  	o  O2 + O2  (slow) O2 + NO  	o  NO2 + O (fast) O + NO  	o  NO2  (fast)  
E)  none of these " class="answers-bank-image d-inline" rel="preload" > NO3 (fast equilibrium) NO3 + NO  →	o→  2NO2  (slow) 
C)  2NO 2  	o  2NO2 obeys the rate law -   = kobsd[NO]2[O2]. Which of the following mechanisms is consistent with the experimental rate law? 
A)  NO + NO  	o  N2O2 (slow) N2O2 + O2  	o  2NO2  (fast)  
B)  NO + O2     NO3 (fast equilibrium) NO3 + NO  	o  2NO2  (slow)  
C)  2NO   N2O2 (fast equilibrium) N2O2  	o  NO2 + O (slow) NO + O  	o  NO2 (fast)  
D)  O2 + O2  	o  O2 + O2  (slow) O2 + NO  	o  NO2 + O (fast) O + NO  	o  NO2  (fast)  
E)  none of these " class="answers-bank-image d-inline" rel="preload" > N2O2 (fast equilibrium) N2O2  →	o→  NO2 + O (slow) NO + O  →	o→  NO2 (fast) 
D)  O2 + O2  →	o→  O2 + O2  (slow) O2 + NO  →	o→  NO2 + O (fast) O + NO  →	o→  NO2  (fast) 
E)  none of these F) B) and E)
G) A) and C)

Question 2

The reaction A  →	o→  B + C is known to be zero order in A with a rate constant of 5.0  ×	imes×  10-2 mol/L·s at 25°C.An experiment was run at 25°C where [A]0 = 1.0  ×	imes×  10-3 M.
-The integrated rate law is

Accepted Answer

A)  [A] = kt
B)  [A] - [A]0 = kt
C)   -2 mol/L·s at 25°C.An experiment was run at 25°C where [A]0 = 1.0  	imes  10-3 M. -The integrated rate law is 
A)  [A] = kt 
B)  [A] - [A]0 = kt 
C)     
D)     
E)  [A]0 - [A] = kt " class="answers-bank-image d-inline" rel="preload" >
D)   -2 mol/L·s at 25°C.An experiment was run at 25°C where [A]0 = 1.0  	imes  10-3 M. -The integrated rate law is 
A)  [A] = kt 
B)  [A] - [A]0 = kt 
C)     
D)     
E)  [A]0 - [A] = kt " class="answers-bank-image d-inline" rel="preload" >
E)  [A]0 - [A] = kt F) B) and C)
G) None of the above

Question 3

A general reaction written as A + 2B  →	o→  C + 2D is studied and yields the following data:

-What is the overall order of the reaction?

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4 F) D) and E)
G) All of the above

Question 4

For the reaction aA ? Products, use the following choices

-[A] is constant.

Accepted Answer

A)    zero order in A
B)    first order in A
C)    second order in A
D)    a, b, c
E)    none of the aboveF) C) and D)
G) A) and B)

Question 5

At a given temperature,a first-order reaction has a rate constant of 3.4  ×	imes×  10-3 s-1.The time required for the reaction to be 44% completed is

Accepted Answer

A)  4.0 min
B)  1.2 min
C)  20 min
D)  2.8 min
E)  19 min F) A) and B)
G) C) and D)

Question 6

For the reaction  ,at a particular instant in time,the rate of the reaction is 0.0223 M/s.What is the rate of change of A?

Accepted Answer

A)  -0.0223 M/s
B)  0.112 M/s
C)  -0.112 M/s
D)  -0.00446 M/s
E)  0.00446 M/sF) A) and E)
G) A) and D)

Question 7

The half-life of this reaction is approximately

Accepted Answer

A)  15 minutes
B)  18 minutes
C)  23 minutes
D)  36 minutes
E)  45 minutesF) All of the above
G) None of the above

Question 8

Which of the following statements about enzymes is incorrect?

Accepted Answer

A)  They are proteins that catalyze specific biologic reactions.
B)  Several hundred are now known.
C)  The molecules they react with are called substrates.
D)  They are equal to inorganic catalysts in efficiency.
E)  All of these are correct.F) A) and C)
G) C) and D)

Question 9

Consider the reaction:  At a certain instant the initial rate of disappearance of the oxygen gas is X.What is the value of the appearance of water at the same instant?

Accepted Answer

A)  1.2 X
B)  1.1 X
C)  0.86 X
D)  0.58 X
E)  cannot be determined from the dataF) A) and D)
G) A) and E)

Question 10

Of what use is it to find a rate law for a reaction?

Accepted Answer

A)  We can use the rate law to directly determine coefficients in the balanced equation.
B)  From the rate law we can evaluate potential reaction mechanisms.
C)  The rate law gives us a good indication of the thermodynamic stability of the products.
D)  The rate law can lead us to determine the equilibrium constant for the reaction.
E)  None of these.F) B) and E)
G) B) and D)

Question 11

Which of the following statements is typically true for a catalyst?
I.The concentration of the catalyst will go down as a reaction proceeds.
II.The catalyst provides a new pathway in the reaction mechanism.
III.The catalyst speeds up the reaction.

Accepted Answer

A)  I only
B)  II only
C)  III only
D)  I and III
E)  II and IIIF) B) and C)
G) C) and D)

Question 12

According to collision theory,the activated complex that forms in step 1 could have which of the following structures? (The dotted lines represent partial bonds. )

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and D)
G) All of the above

Question 13

If the temperature changed to 310 K,the rate constant k would change.The ratio of k at 310 K to k at 300.0 K is closest to what whole number?

Accepted Answer

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

Question 14

Which step is rate determining?

Accepted Answer

A)  both steps
B)  step 1
C)  step 2
D)  a step that is intermediate to step 1 and step 2
E)  none of theseF) None of the above
G) B) and D)

Question 15

The following initial rate data were found for the reaction
2MnO4- + 5H2C2O4 + 6H+  →	o→   2Mn2+ + 10CO2 + 8H2O
4- + 5H2C2O4 + 6H+  	o   2Mn2+ + 10CO2 + 8H2O   -What is the value of the rate constant? A) 2  	imes  105 M.s-1 B) 2  	imes  105 M-2.s-1 C) 200 M-1.s-1 D) 200 M-2.s-1 E) 2  	imes 10-4 M.s-1 " class="answers-bank-image d-inline" rel="preload" >
-What is the value of the rate constant?

Accepted Answer

A)  2  ×	imes×  105 M.s-1
B)  2  ×	imes×  105 M-2.s-1
C)  200 M-1.s-1
D)  200 M-2.s-1
E)  2  ×	imes× 10-4 M.s-1 F) A) and B)
G) A) and C)

Question 16

A general reaction written as A + 2B  →	o→  C + 2D is studied and yields the following data:

-What is the order of the reaction with respect to A?

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4 F) All of the above
G) C) and E)

Question 17

The kinetics of the reaction 0 = 1.0  	imes  10-3 M and [B]0 = 5.0 M,a plot of ln [A] versus t was found to give a straight line with slope = -5.0  	imes 10-2 s-1. For a run where [A]0 = 1.0  	imes   10-3 M and [B]0 = 10.0 M,a plot of ln [A] versus t was found to give a straight line with slope = -7.1  	imes  10-2 s-1. -What is the value of n? A) 0 B) 0.5 C) 1 D) 1.5 E) 2 " class="answers-bank-image d-inline" rel="preload" > were studied and the following results obtained,where the rate law is: 0 = 1.0  	imes  10-3 M and [B]0 = 5.0 M,a plot of ln [A] versus t was found to give a straight line with slope = -5.0  	imes 10-2 s-1. For a run where [A]0 = 1.0  	imes   10-3 M and [B]0 = 10.0 M,a plot of ln [A] versus t was found to give a straight line with slope = -7.1  	imes  10-2 s-1. -What is the value of n? A) 0 B) 0.5 C) 1 D) 1.5 E) 2 " class="answers-bank-image d-inline" rel="preload" > For a run where [A]0 = 1.0  ×	imes×  10-3 M and [B]0 = 5.0 M,a plot of ln [A] versus t was found to give a straight line with slope = -5.0  ×	imes× 10-2 s-1.
For a run where [A]0 = 1.0  ×	imes×   10-3 M and [B]0 = 10.0 M,a plot of ln [A] versus t was found to give a straight line with slope = -7.1  ×	imes×  10-2 s-1.
-What is the value of n?

Accepted Answer

A)  0
B)  0.5
C)  1
D)  1.5
E)  2 F) A) and D)
G) A) and E)

Question 18

For the reaction aA  →	o→  Products,use the following choices
-The half-life is constant.

Accepted Answer

A)  zero order in A
B)  first order in A
C)  second order in A
D)  a,b,c
E)  none of the above F) B) and D)
G) C) and D)

Question 19

According to the proposed mechanism,what should the overall rate law be?

Accepted Answer

A)  rate = k[A2]2
B)  rate = k[A2]
C)  rate = k[A2][B2]
D)  rate = k[A2][R]
E)  rate = k[R]2F) A) and E)
G) A) and C)

Question 20

The reaction: 2A + B  →	o→  C
Has the following proposed mechanism:
Step 1: A + B 2[B] C) k[A]2[B]2 D) k[A][B] E) k[A][B]2 " class="answers-bank-image d-inline" rel="preload" > D (fast equilibrium) 
Step 2: D + B  →	o→  E
Step 3: E + A  →	o→  C + B
If step 2 is the rate-determining step,then the rate of formation of C should equal:

Accepted Answer

A)  k[A]
B)  k[A]2[B]
C)  k[A]2[B]2
D)  k[A][B]
E)  k[A][B]2 F) B) and C)
G) D) and E)

Exam 12: Chemical Kinetics

Correct Answer
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A general reaction written as A + 2B $\to$ C + 2D is studied and yields the following data: $A general reaction written as A + 2B \to C + 2D is studied and yields the following data: -What is the overall order of the reaction? A) 0 B) 1 C) 2 D) 3 E) 4$ -What is the overall order of the reaction?

Correct Answer
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Which of the following statements about enzymes is incorrect?

Correct Answer
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At a given temperature,a first-order reaction has a rate constant of 3.4 $\times$ 10^-³ s^-¹.The time required for the reaction to be 44% completed is

Correct Answer
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Which step is rate determining?

Correct Answer
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For the reaction aA $\to$ Products,use the following choices -The half-life is constant.

Correct Answer
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The half-life of this reaction is approximately

Correct Answer
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If the temperature changed to 310 K,the rate constant k would change.The ratio of k at 310 K to k at 300.0 K is closest to what whole number?

Correct Answer
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The reaction A $\to$ B + C is known to be zero order in A with a rate constant of 5.0 $\times$ 10^-² mol/L·s at 25°C.An experiment was run at 25°C where [A]₀ = 1.0 $\times$ 10^-³ M. -The integrated rate law is

Correct Answer
verified

According to the proposed mechanism,what should the overall rate law be?

Correct Answer
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According to collision theory,the activated complex that forms in step 1 could have which of the following structures? (The dotted lines represent partial bonds. )

Correct Answer
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Which of the following statements is typically true for a catalyst? I.The concentration of the catalyst will go down as a reaction proceeds. II.The catalyst provides a new pathway in the reaction mechanism. III.The catalyst speeds up the reaction.

Correct Answer
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Correct Answer
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Consider the reaction: At a certain instant the initial rate of disappearance of the oxygen gas is X.What is the value of the appearance of water at the same instant?

Correct Answer
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Correct Answer
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Of what use is it to find a rate law for a reaction?

Correct Answer
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Correct Answer
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Correct Answer
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For the reaction aA ? Products, use the following choices -[A] is constant.

Correct Answer
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For the reaction ,at a particular instant in time,the rate of the reaction is 0.0223 M/s.What is the rate of change of A?

Correct Answer
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Exam 12: Chemical Kinetics

A general reaction written as A + 2B →\to→ C + 2D is studied and yields the following data: -What is the order of the reaction with respect to A?

Correct AnswerverifiedShow Answer

A general reaction written as A + 2B →\to→ C + 2D is studied and yields the following data: -What is the overall order of the reaction?

Correct AnswerverifiedShow Answer

Which of the following statements about enzymes is incorrect?

Correct AnswerverifiedShow Answer

At a given temperature,a first-order reaction has a rate constant of 3.4 ×\times× 10-3 s-1.The time required for the reaction to be 44% completed is

Correct AnswerverifiedShow Answer

Which step is rate determining?

Correct AnswerverifiedShow Answer

For the reaction aA →\to→ Products,use the following choices -The half-life is constant.

Correct AnswerverifiedShow Answer

The half-life of this reaction is approximately

Correct AnswerverifiedShow Answer

If the temperature changed to 310 K,the rate constant k would change.The ratio of k at 310 K to k at 300.0 K is closest to what whole number?

Correct AnswerverifiedShow Answer

The reaction A →\to→ B + C is known to be zero order in A with a rate constant of 5.0 ×\times× 10-2 mol/L·s at 25°C.An experiment was run at 25°C where [A]0 = 1.0 ×\times× 10-3 M. -The integrated rate law is

Correct AnswerverifiedShow Answer

According to the proposed mechanism,what should the overall rate law be?

Correct AnswerverifiedShow Answer

According to collision theory,the activated complex that forms in step 1 could have which of the following structures? (The dotted lines represent partial bonds. )

Correct AnswerverifiedShow Answer

Which of the following statements is typically true for a catalyst? I.The concentration of the catalyst will go down as a reaction proceeds. II.The catalyst provides a new pathway in the reaction mechanism. III.The catalyst speeds up the reaction.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider the reaction: At a certain instant the initial rate of disappearance of the oxygen gas is X.What is the value of the appearance of water at the same instant?

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The following initial rate data were found for the reaction 2MnO4- + 5H2C2O4 + 6H+ →\to→ 2Mn2+ + 10CO2 + 8H2O -What is the value of the rate constant?

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Of what use is it to find a rate law for a reaction?

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The reaction 2NO + O2 →\to→ 2NO2 obeys the rate law - = kobsd[NO]2[O2]. Which of the following mechanisms is consistent with the experimental rate law?

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The reaction: 2A + B →\to→ C Has the following proposed mechanism: Step 1: A + B D (fast equilibrium) Step 2: D + B →\to→ E Step 3: E + A →\to→ C + B If step 2 is the rate-determining step,then the rate of formation of C should equal:

Correct AnswerverifiedShow Answer

For the reaction aA ? Products, use the following choices -[A] is constant.

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For the reaction ,at a particular instant in time,the rate of the reaction is 0.0223 M/s.What is the rate of change of A?

Correct AnswerverifiedShow Answer

Correct Answer
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A general reaction written as A + 2B $\to$ C + 2D is studied and yields the following data: $A general reaction written as A + 2B \to C + 2D is studied and yields the following data: -What is the overall order of the reaction? A) 0 B) 1 C) 2 D) 3 E) 4$ -What is the overall order of the reaction?

Correct Answer
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Correct Answer
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At a given temperature,a first-order reaction has a rate constant of 3.4 $\times$ 10^-³ s^-¹.The time required for the reaction to be 44% completed is

Correct Answer
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Correct Answer
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For the reaction aA $\to$ Products,use the following choices -The half-life is constant.

Correct Answer
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Correct Answer
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Correct Answer
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The reaction A $\to$ B + C is known to be zero order in A with a rate constant of 5.0 $\times$ 10^-² mol/L·s at 25°C.An experiment was run at 25°C where [A]₀ = 1.0 $\times$ 10^-³ M. -The integrated rate law is

Correct Answer
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Correct Answer
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Correct Answer
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