Question 1

Heterogeneous catalysts have different phases from reactants.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is true?

Accepted Answer

A)  If we know that a reaction is an elementary reaction, then we know its rate law.
B)  The rate-determining step of a reaction is the rate of the fastest elementary step of its mechanism.
C)  Since intermediate compounds can be formed, the chemical equations for the elementary reactions in a multistep mechanism do not always have to add to give the chemical equation of the overall process.
D)  In a reaction mechanism, an intermediate is identical to an activated complex.
E)  All of the above statements are true.

Question 3

A particular first-order reaction has a rate constant of 1.35 × 3 B) 1.95 × 104 C) 358 D) 3.48 × 1073 E) 1.35 ×  " class="answers-bank-image d-inline" rel="preload" > 3 B) 1.95 × 104 C) 358 D) 3.48 × 1073 E) 1.35 ×  " class="answers-bank-image d-inline" rel="preload" > at 25.0 °C.What is the magnitude of k at 3 B) 1.95 × 104 C) 358 D) 3.48 × 1073 E) 1.35 ×  " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  1.92 × 103
B)  1.95 × 104
C)  358
D)  3.48 × 1073
E)  1.35 × 3 
B)  1.95 × 104 
C)  358 
D)  3.48 × 1073 
E)  1.35 ×  " class="answers-bank-image d-inline" rel="preload" >

Question 4

Units of the rate constant of a reaction are independent of the overall reaction order.

Accepted Answer

A) True 
 B)False

Question 5

The mechanism for formation of the product X is: A + B → C + D (slow) 
B + D → X (fast) 
The intermediate reactant in the reaction is ________.

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  X

Question 6

The average rate of disappearance of I- between 400.0 s and 800.0 s is ________ M/s.

Accepted Answer

A)  2.8 × 10-5
B)  1.4 × 10-5
C)  5.8 × 10-5
D)  3.6 × 104
E)  2.6 × 10-4

Question 7

What is the concentration (M) of S2O82- remaining at 1200 s?

Accepted Answer

A)  +0.035
B)  +0.038
C)  -0.038
D)  +0.012
E)  -0.012

Question 8

What is the rate constant ( 2 B) 7.94 × 102 C) -9.09 × 10-4 D) 1.26 × 10-3 E) 1.82 × 10-3" class="answers-bank-image d-inline" rel="preload" > ) of a first-order process that has a half-life of 550 s?

Accepted Answer

A)  3.81 × 102
B)  7.94 × 102
C)  -9.09 × 10-4
D)  1.26 × 10-3
E)  1.82 × 10-3

Question 9

Which of the following statements describes why nitrogen fixation is a difficult process?

Accepted Answer

A)  there is so little nitrogen in the atmosphere
B)  nitrogen is very unreactive, largely due to its triple bond
C)  nitrogen exists in the atmosphere primarily as its oxides which are very unreactive
D)  of the high polarity of nitrogen molecules preventing them from dissolving in biological fluids, such as those inside cells
E)  of the extreme toxicity of nitrogen

Question 10

A reaction was found to be zero order in A.Increasing the concentration of A by a factor of 3 will cause the reaction rate to ________.

Accepted Answer

A)  remain constant
B)  increase by a factor of 27
C)  increase by a factor of 9
D)  triple
E)  decrease by a factor of the cube root of 3

Question 11

A first-order reaction has a rate constant of 0.33  .It takes ________ min for the reactant concentration to decrease from 0.13 M to 0.066 M.

Accepted Answer

A)  0.085
B)  0.13
C)  0.89
D)  2.4
E)  2.1

Question 12

Of the following,only ________ is a valid unit for reaction rate.

Accepted Answer

A)  M/s
B)  mol/g
C)  mmol/mL
D)  g/L
E)  atm/g

Question 13

Of the units below,________ are appropriate for a third-order reaction rate constant.

Accepted Answer

A)  M-2s-1
B)  M s-1
C)  s-1
D)  M-1s-1
E)  mol/L

Question 14

The rate constant for a second-order reaction is 0.13   .If the initial concentration of reactant is  it takes ________ s for the concentration to decrease to

Accepted Answer

A)  0.017
B)  1.4
C)  14
D)  80.
E)  10.

Question 15

What is the rate constant (s-1) for this reaction?

Accepted Answer

A)  3.0 × 10-2
B)  14
C)  0.46
D)  4.0 × 102
E)  7.8 × 10-2

Question 16

The average rate disappearance of A between 20 s and 30 s is ________ mol/s.

Accepted Answer

A)  5.0 × 10-4
B)  1.6 × 10-2
C)  1.5 × 10-3
D)  670
E)  0.15

Question 17

A possible mechanism for the overall reaction Br2 (g) + 2NO (g) → 2NOBr (g) 
Is
Step 1) NO (g) + Br2 (g)  2 (g) + 2NO (g) → 2NOBr (g)  Is Step 1) NO (g) + Br2 (g)    NOBr2 (g) (fast)  Step 2) NOBr2 (g) + NO (g)    2NOBr (slow)  What is the rate determining step for this reaction? A) step 2 B) reverse of step 1 C) both steps 1 and 2 D) step 1 E) reverse of step 2" class="answers-bank-image d-inline" rel="preload" > NOBr2 (g) (fast) 
Step 2) NOBr2 (g) + NO (g)  2 (g) + 2NO (g) → 2NOBr (g)  Is Step 1) NO (g) + Br2 (g)    NOBr2 (g) (fast)  Step 2) NOBr2 (g) + NO (g)    2NOBr (slow)  What is the rate determining step for this reaction? A) step 2 B) reverse of step 1 C) both steps 1 and 2 D) step 1 E) reverse of step 2" class="answers-bank-image d-inline" rel="preload" > 2NOBr (slow) 
What is the rate determining step for this reaction?

Accepted Answer

A)  step 2
B)  reverse of step 1
C)  both steps 1 and 2
D)  step 1
E)  reverse of step 2

Question 18

Define a homogeneous catalyst.

Accepted Answer

A CATALYST THAT IS P...

Question 19

According to the collision model,reaction rates are affected by reactant ________ and ________.

Accepted Answer

concentrat...

Question 20

The overall order of a reaction is 1.The units of the rate constant for the reaction are ________.

Accepted Answer

A)  M/s
B)  M-1s-1
C)  1/s
D)  1/M
E)  s/M2

Exam 14: Chemical Kinetics

The rate constant for a second-order reaction is 0.13 .If the initial concentration of reactant is it takes ________ s for the concentration to decrease to

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What is the rate constant (s-1) for this reaction?

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Which of the following statements describes why nitrogen fixation is a difficult process?

Correct AnswerverifiedShow Answer

Define a homogeneous catalyst.

Correct AnswerverifiedA CATALYST THAT IS P...View AnswerShow Answer

The average rate of disappearance of I- between 400.0 s and 800.0 s is ________ M/s.

Correct AnswerverifiedShow Answer

A particular first-order reaction has a rate constant of 1.35 × at 25.0 °C.What is the magnitude of k at

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A first-order reaction has a rate constant of 0.33 .It takes ________ min for the reactant concentration to decrease from 0.13 M to 0.066 M.

Correct AnswerverifiedShow Answer

What is the concentration (M) of S2O82- remaining at 1200 s?

Correct AnswerverifiedShow Answer

Of the following,only ________ is a valid unit for reaction rate.

Correct AnswerverifiedShow Answer

A reaction was found to be zero order in A.Increasing the concentration of A by a factor of 3 will cause the reaction rate to ________.

Correct AnswerverifiedShow Answer

The mechanism for formation of the product X is: A + B → C + D (slow) B + D → X (fast) The intermediate reactant in the reaction is ________.

Correct AnswerverifiedShow Answer

The average rate disappearance of A between 20 s and 30 s is ________ mol/s.

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The overall order of a reaction is 1.The units of the rate constant for the reaction are ________.

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Of the units below,________ are appropriate for a third-order reaction rate constant.

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What is the rate constant ( ) of a first-order process that has a half-life of 550 s?

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A possible mechanism for the overall reaction Br2 (g) + 2NO (g) → 2NOBr (g) Is Step 1) NO (g) + Br2 (g) NOBr2 (g) (fast) Step 2) NOBr2 (g) + NO (g) 2NOBr (slow) What is the rate determining step for this reaction?

Correct AnswerverifiedShow Answer

Which of the following is true?

Correct AnswerverifiedShow Answer

According to the collision model,reaction rates are affected by reactant ________ and ________.

Correct Answerverifiedconcentrat...View AnswerShow Answer

Heterogeneous catalysts have different phases from reactants.

Correct AnswerverifiedShow Answer

Units of the rate constant of a reaction are independent of the overall reaction order.

Correct AnswerverifiedShow Answer

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What is the rate constant (s^-1) for this reaction?

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A CATALYST THAT IS P...
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The average rate of disappearance of I^- between 400.0 s and 800.0 s is ________ M/s.

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What is the concentration (M) of S₂O₈^2- remaining at 1200 s?

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A possible mechanism for the overall reaction Br₂ (g) + 2NO (g) → 2NOBr (g) Is Step 1) NO (g) + Br₂(g) NOBr₂ (g) (fast) Step 2) NOBr₂(g) + NO (g) 2NOBr (slow) What is the rate determining step for this reaction?

Correct Answer
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According to the collision model,reaction rates are affected by reactant and .

Correct Answer
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concentrat...
View Answer

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