Question 1

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) →B(g) . The following data are obtained for [A] as the reaction proceeds: -4 B) 1.7 × 10-3 C) 590 D) 7.1 × 10-3 E) 1.4 × 10-3" class="answers-bank-image d-inline" rel="preload" >
-The average rate of disappearance of A between 20 s and 40 s is ________ mol/s.

Accepted Answer

A)  8.5 × 10-4
B)  1.7 × 10-3
C)  590
D)  7.1 × 10-3
E)  1.4 × 10-3F) C) and E)
G) B) and E)

Question 2

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) →B(g) . The following data are obtained for [A] as the reaction proceeds: -4 B) 1.6 × 10-2 C) 1.5 × 10-3 D) 670 E) 0.15" class="answers-bank-image d-inline" rel="preload" >
-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)  0.15F) D) and E)
G) A) and C)

Question 3

The kinetics of the reaction below were studied and it was determined that the reaction rate did not change when the concentration of B was tripled. The reaction is ________ order in B. A + B → P

Accepted Answer

A)  zero
B)  first
C)  second
D)  third
E)  one-halfF) All of the above
G) B) and C)

Question 4

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

Accepted Answer

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

Question 5

Reaction rates are affected by reactant concentrations and temperature. This is accounted for by the ________.

Accepted Answer

The answer of Reaction rates are affected by reactant concentrations...

Question 6

The reaction A → B is first order in [A]. Consider the following data. -1. A) 0.014 B) 0.030 C) 0.013 D) 3.0 E) 3.1 × 10-3" class="answers-bank-image d-inline" rel="preload" > The rate constant for this reaction is ________ s-1.

Accepted Answer

A)  0.014
B)  0.030
C)  0.013
D)  3.0
E)  3.1 × 10-3F) A) and E)
G) All of the above

Question 7

A catalyst can increase the rate of a reaction ________.

Accepted Answer

A)  by changing the value of the frequency factor (
A)  
B)  by increasing the overall activation energy (Ea) of the reaction
C)  by lowering the activation energy of the reverse reaction
D)  by providing an alternative pathway with a lower activation energy
E)  All of these are ways that a catalyst might act to increase the rate of reaction.F) None of the above
G) D) and E)

Question 8

The concentration of S2O82- remaining at 1600 s is ________ M.

Accepted Answer

A)  0.036
B)  0.014
C)  0.043
D)  0.064
E)  0.029F) C) and D)
G) B) and E)

Question 9

A reaction was found to be second order in carbon monoxide concentration. The rate of the reaction ________ if the [CO] is doubled, with everything else kept the same.

Accepted Answer

A)  doubles
B)  remains unchanged
C)  triples
D)  increases by a factor of 4
E)  is reduced by a factor of 2F) A) and E)
G) A) and B)

Question 10

At elevated temperatures, nitrogen dioxide decomposes to nitrogen oxide and oxygen: NO2 (g)  → NO (g)  + 2 (g)  → NO (g)  +   O2 (g)  The reaction is second order in NO2 with a rate constant of 0.543 M-1s-1at 300 °C. If the initial [NO2] is 0.260 M, it will take ________ s for the concentration to drop to 0.075 M. A) 3.34 B) 0.0880 C) 2.29 D) 0.299 E) 17.5" class="answers-bank-image d-inline" rel="preload" > O2 (g) 
The reaction is second order in NO2 with a rate constant of 0.543 M-1s-1at 300 °C. If the initial [NO2] is 0.260 M, it will take ________ s for the concentration to drop to 0.075 M.

Accepted Answer

A)  3.34
B)  0.0880
C)  2.29
D)  0.299
E)  17.5F) A) and E)
G) B) and E)

Question 11

The concentration of S2O82- remaining at 800 s is ________ M.

Accepted Answer

A)  0.046
B)  0.076
C)  4.00 × 10-3
D)  0.015
E)  0.041F) A) and C)
G) C) and D)

Question 12

The half-life for a first order rate law depends on the starting concentration.

Accepted Answer

A) True 
 B)False

Question 13

The data in the table below were obtained for the reaction:
2 ClO2 (aq)  + 2 OH- (aq)  → ClO3- (aq)  + ClO2- (aq)  + H2O (1)  2 (aq)  + 2 OH- (aq)  → ClO3- (aq)  + ClO2- (aq)  + H2O (1)    -What is the magnitude of the rate constant for the reaction? A) 1.15 × 104 B) 4.6 C) 230 D) 115 E) 713" class="answers-bank-image d-inline" rel="preload" >
-What is the magnitude of the rate constant for the reaction?

Accepted Answer

A)  1.15 × 104
B)  4.6
C)  230
D)  115
E)  713F) All of the above
G) A) and C)

Question 14

The rate law of the overall reaction A + B → C
Is rate = k[A]2. Which of the following will not increase the rate of the reaction?

Accepted Answer

A)  increasing the concentration of reactant A
B)  increasing the concentration of reactant B
C)  increasing the temperature of the reaction
D)  adding a catalyst for the reaction
E)  All of these will increase the rate.F) B) and D)
G) B) and E)

Question 15

For the elementary reaction NO3 + CO → NO2 + CO2
The molecularity of the reaction is ________, and the rate law is 3 + CO → NO2 + CO2 The molecularity of the reaction is ________, and the rate law is   A) 2, k[NO3][CO] B) 4, k[NO3][CO][NO2][CO2] C) 2, k[NO2][CO2] D) 2, k[NO3][CO]/[NO2][CO2] E) 4, k[NO2][CO2]/[NO3][CO]" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  2, k[NO3][CO]
B)  4, k[NO3][CO][NO2][CO2]
C)  2, k[NO2][CO2]
D)  2, k[NO3][CO]/[NO2][CO2]
E)  4, k[NO2][CO2]/[NO3][CO]F) B) and D)
G) A) and E)

Question 16

The rate of disappearance of HBr in the gas phase reaction 2HBr (g)  → H2 (g)  + Br2 (g) 
Is 0.190 M s-1 at 150 °C. The rate of appearance of Br2 is ________ M s-1.

Accepted Answer

A)  2.63
B)  0.095
C)  0.0361
D)  0.380
E)  0.436F) All of the above
G) A) and E)

Question 17

The initial concentration of reactant in a first-order reaction is 0.27 M. The rate constant for the reaction is 0.75 s-1. What is the concentration (mol/L) of reactant after 1.8 s?

Accepted Answer

A)  6.0
B)  1.7
C)  0.070
D)  0.012
E)  1.0F) B) and C)
G) C) and D)

Question 18

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 (g)  → 2NO (g)  + O2 (g) 
In a particular experiment at 300 °C, [NO2] drops from 0.0100 to 0.00800 M in 100 s. The rate of appearance of O2 for this period is ________ M/s.

Accepted Answer

A)  1.0 × 10-5
B)  2.0 × 10-5
C)  4.0 × 10-5
D)  2.0 × 10-3
E)  4.0 × 10-3F) B) and C)
G) A) and E)

Question 19

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/M2F) B) and C)
G) None of the above

Question 20

The reaction 2NO2 → 2NO + O2
Follows second-order kinetics. At 300 °C, [NO2] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is ________ M-1s-1.

Accepted Answer

A)  0.096
B)  0.65
C)  0.81
D)  1.2
E)  0.54F) None of the above
G) All of the above

Exam 14: Chemical Kinetics

The rate law of the overall reaction A + B → C Is rate = k[A]². Which of the following will not increase the rate of the reaction?

Correct Answer
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Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO₂ (g) → 2NO (g) + O₂ (g) In a particular experiment at 300 °C, [NO₂] drops from 0.0100 to 0.00800 M in 100 s. The rate of appearance of O₂ for this period is ________ M/s.

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

Correct Answer
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A catalyst can increase the rate of a reaction ________.

Correct Answer
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A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) →B(g) . The following data are obtained for [A] as the reaction proceeds: -The average rate of disappearance of A between 20 s and 40 s is ________ mol/s.

Correct Answer
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The reaction A → B is first order in [A]. Consider the following data. The rate constant for this reaction is ________ s^-1.

Correct Answer
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The concentration of S₂O₈^2- remaining at 1600 s is ________ M.

Correct Answer
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The initial concentration of reactant in a first-order reaction is 0.27 M. The rate constant for the reaction is 0.75 s^-1. What is the concentration (mol/L) of reactant after 1.8 s?

Correct Answer
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Reaction rates are affected by reactant concentrations and temperature. This is accounted for by the ________.

Correct Answer
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The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H₂(g) + Br₂ (g) Is 0.190 M s^-1 at 150 °C. The rate of appearance of Br₂ is ________ M s^-1.

Correct Answer
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For the elementary reaction NO₃ + CO → NO₂ + CO₂ The molecularity of the reaction is ________, and the rate law is

Correct Answer
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The concentration of S₂O₈^2- remaining at 800 s is ________ M.

Correct Answer
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Correct Answer
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The kinetics of the reaction below were studied and it was determined that the reaction rate did not change when the concentration of B was tripled. The reaction is ________ order in B. A + B → P

Correct Answer
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The data in the table below were obtained for the reaction: 2 ClO₂ (aq) + 2 OH^- (aq) → ClO₃^- (aq) + ClO₂^- (aq) + H₂O (1) -What is the magnitude of the rate constant for the reaction?

Correct Answer
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A reaction was found to be second order in carbon monoxide concentration. The rate of the reaction ________ if the [CO] is doubled, with everything else kept the same.

Correct Answer
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A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) →B(g) . The following data are obtained for [A] as the reaction proceeds: -The average rate disappearance of A between 20 s and 30 s is ________ mol/s.

Correct Answer
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The reaction 2NO₂ → 2NO + O₂ Follows second-order kinetics. At 300 °C, [NO₂] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is ________ M^-1s^-1.

Correct Answer
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The half-life for a first order rate law depends on the starting concentration.

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

Correct Answer
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Exam 14: Chemical Kinetics

The rate law of the overall reaction A + B → C Is rate = k[A]2. Which of the following will not increase the rate of the reaction?

Correct AnswerverifiedShow Answer

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 (g) → 2NO (g) + O2 (g) In a particular experiment at 300 °C, [NO2] drops from 0.0100 to 0.00800 M in 100 s. The rate of appearance of O2 for this period is ________ M/s.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A catalyst can increase the rate of a reaction ________.

Correct AnswerverifiedShow Answer

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) →B(g) . The following data are obtained for [A] as the reaction proceeds: -The average rate of disappearance of A between 20 s and 40 s is ________ mol/s.

Correct AnswerverifiedShow Answer

The reaction A → B is first order in [A]. Consider the following data. The rate constant for this reaction is ________ s-1.

Correct AnswerverifiedShow Answer

The concentration of S2O82- remaining at 1600 s is ________ M.

Correct AnswerverifiedShow Answer

The initial concentration of reactant in a first-order reaction is 0.27 M. The rate constant for the reaction is 0.75 s-1. What is the concentration (mol/L) of reactant after 1.8 s?

Correct AnswerverifiedShow Answer

Reaction rates are affected by reactant concentrations and temperature. This is accounted for by the ________.

Correct AnswerverifiedShow Answer

The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H2 (g) + Br2 (g) Is 0.190 M s-1 at 150 °C. The rate of appearance of Br2 is ________ M s-1.

Correct AnswerverifiedShow Answer

For the elementary reaction NO3 + CO → NO2 + CO2 The molecularity of the reaction is ________, and the rate law is

Correct AnswerverifiedShow Answer

The concentration of S2O82- remaining at 800 s is ________ M.

Correct AnswerverifiedShow Answer

At elevated temperatures, nitrogen dioxide decomposes to nitrogen oxide and oxygen: NO2 (g) → NO (g) + O2 (g) The reaction is second order in NO2 with a rate constant of 0.543 M-1s-1at 300 °C. If the initial [NO2] is 0.260 M, it will take ________ s for the concentration to drop to 0.075 M.

Correct AnswerverifiedShow Answer

The kinetics of the reaction below were studied and it was determined that the reaction rate did not change when the concentration of B was tripled. The reaction is ________ order in B. A + B → P

Correct AnswerverifiedShow Answer

The data in the table below were obtained for the reaction: 2 ClO2 (aq) + 2 OH- (aq) → ClO3- (aq) + ClO2- (aq) + H2O (1) -What is the magnitude of the rate constant for the reaction?

Correct AnswerverifiedShow Answer

A reaction was found to be second order in carbon monoxide concentration. The rate of the reaction ________ if the [CO] is doubled, with everything else kept the same.

Correct AnswerverifiedShow Answer

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) →B(g) . The following data are obtained for [A] as the reaction proceeds: -The average rate disappearance of A between 20 s and 30 s is ________ mol/s.

Correct AnswerverifiedShow Answer

The reaction 2NO2 → 2NO + O2 Follows second-order kinetics. At 300 °C, [NO2] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is ________ M-1s-1.

Correct AnswerverifiedShow Answer

The half-life for a first order rate law depends on the starting concentration.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The rate law of the overall reaction A + B → C Is rate = k[A]². Which of the following will not increase the rate of the reaction?

Correct Answer
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Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO₂ (g) → 2NO (g) + O₂ (g) In a particular experiment at 300 °C, [NO₂] drops from 0.0100 to 0.00800 M in 100 s. The rate of appearance of O₂ for this period is ________ M/s.

Correct Answer
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The reaction A → B is first order in [A]. Consider the following data. The rate constant for this reaction is ________ s^-1.

Correct Answer
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The concentration of S₂O₈^2- remaining at 1600 s is ________ M.

Correct Answer
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The initial concentration of reactant in a first-order reaction is 0.27 M. The rate constant for the reaction is 0.75 s^-1. What is the concentration (mol/L) of reactant after 1.8 s?

Correct Answer
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Correct Answer
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The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H₂(g) + Br₂ (g) Is 0.190 M s^-1 at 150 °C. The rate of appearance of Br₂ is ________ M s^-1.

Correct Answer
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For the elementary reaction NO₃ + CO → NO₂ + CO₂ The molecularity of the reaction is ________, and the rate law is

Correct Answer
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The concentration of S₂O₈^2- remaining at 800 s is ________ M.

Correct Answer
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Correct Answer
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The data in the table below were obtained for the reaction: 2 ClO₂ (aq) + 2 OH^- (aq) → ClO₃^- (aq) + ClO₂^- (aq) + H₂O (1) -What is the magnitude of the rate constant for the reaction?

Correct Answer
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The reaction 2NO₂ → 2NO + O₂ Follows second-order kinetics. At 300 °C, [NO₂] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is ________ M^-1s^-1.

Correct Answer
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Correct Answer
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