Question 1

A catalyst lowers the activation energy but does not affect the mechanism of a reaction.

Accepted Answer

A) True 
 B)False

Question 2

The rate constant for the reaction 3A → 4B is 6.00 × 10−3 L mol−1min−1. How long will it take the concentration of A to drop from 0.75 M to 0.25 M?

Accepted Answer

A)  2.2 × 10 −3 min
B)  5.5 × 10 −3 min
C)  180 min
D)  440 min
E)  5.0 × 10 2 minF) A) and B)
G) All of the above

Question 3

In the lock and key model of enzyme action, the active site on the enzyme provides an exact fit for the substrate.

Accepted Answer

A) True 
 B)False

Question 4

The active ingredient in an over the counter pain killer analgesic decomposes with a rate constant, k = 9.05 × 10−4 day−1. How many days does it take for 15% of the original ingredient to decompose?

Accepted Answer

A)  730 days
B)  414 days
C)  365 days
D)  180 days
E)  78 daysF) B) and C)
G) B) and D)

Question 5

Carbon-14 is a radioactive isotope which decays with a half-life of 5730 years. What is the first-order rate constant for its decay, in units of years−1?

Accepted Answer

A)  5.25 × 10 −5 years −1
B)  1.21 × 10 −4 years −1
C)  1.75 × 10 −4 years −1
D)  3.49 × 10 −4 years −1
E)  3.97 × 10 3 years −1F) A) and C)
G) C) and E)

Question 6

A reaction has an activation energy of 195.0 kJ/mol. When the temperature is increased from 200°C to 220°C, the rate constant will increase by a factor of

Accepted Answer

A)  1.1.
B)  4.3 × 10 4.
C)  3.2.
D)  7.5.
E)  None of these choices are correct.F) B) and D)
G) A) and E)

Question 7

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) A) and B)
G) All of the above

Question 8

Which one of the following sets of units is appropriate for a third-order rate constant?

Accepted Answer

A)  s −1
B)  mol L −1s −1
C)  L mol −1s −1
D)  L 2 mol −2s −1
E)  L 3 mol −3s −1F) All of the above
G) A) and D)

Question 9

For the reaction A(g)  + 2B(g)  → 2C(g)  + 2D(g) 
The following data were collected at constant temperature. Determine the correct rate law for this reaction.
2 [B] C) Rate = k[A] [B] 2 D) Rate = k[A] E) Rate = k[A] 3" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Rate = k[A] [B]
B)  Rate = k[A] 2 [B]
C)  Rate = k[A] [B] 2
D)  Rate = k[A]
E)  Rate = k[A] 3F) A) and E)
G) A) and B)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

The rate law for the reaction 3A → 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 hrF) A) and E)
G) All of the above

Question 12

A study of the decomposition reaction 3RS2 → 3R + 6S yields the following initial rate data. 2 → 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 −1F) C) and D)
G) A) and B)

Question 13

Sucrose decomposes to fructose and glucose in acid solution. When ln [sucrose] is plotted vs. time, a straight line with slope of −0.208 hr−1 results. What is the rate law for the reaction?

Accepted Answer

A)  Rate = 0.208 hr −1 [sucrose] 2
B)  Rate = 0.208 hr −1 [sucrose]
C)  Rate = 0.0433 hr [sucrose] 2
D)  Rate = 0.0433 hr [sucrose]
E)  Rate = 0.208 mol L −1hr −1 [sucrose] 0F) B) and E)
G) C) and E)

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

A reaction is first-order with respect to the reactant R. Which of the following plots will produce a straight line?

Accepted Answer

A)  [R] vs. 1/time
B)  1/[R] vs. time
C)  [R] 2 vs. time
D)  1/[R] 2 vs. time
E)  ln[R] vs. timeF) A) and D)
G) B) and C)

Question 16

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

Accepted Answer

A)  0.94
B)  0.87
C)  0.75
D)  0.13
E)  0.063F) A) and D)
G) B) and C)

Question 17

Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+ + H2O2  ⇄ H2O+−OH (rapid equilibrium) H2O+−OH + Br− → HOBr + H2O (slow) HOBr + H+ + Br− → Br2 + H2O (fast) 
Which of the following rate laws is consistent with the mechanism?

Accepted Answer

A)  Rate = k[H 2O 2][H +] 2[Br −]
B)  Rate = k[H 2O +−OH][Br −]
C)  Rate = k[H 2O 2][H +][Br −]
D)  Rate = k[HOBr][H +][Br −][H 2O 2]
E)  Rate = k[Br −]F) B) and C)
G) C) and D)

Question 18

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

Accepted Answer

A) True 
 B)False

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

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

Correct Answer
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For the reaction A(g) + 2B(g) → 2C(g) + 2D(g) The following data were collected at constant temperature. Determine the correct rate law for this reaction.

Correct Answer
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A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

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

Correct Answer
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Which one of the following sets of units is appropriate for a third-order rate constant?

Correct Answer
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The rate law for the reaction 3A → 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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Correct Answer
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An elementary reaction is a simple, one-step process.

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 SOCl₂to drop from 0.36 M to 0.045 M?

Correct Answer
verified

The rate constant for the reaction 3A → 4B is 6.00 × 10⁻³ L mol⁻¹min⁻¹. How long will it take the concentration of A to drop from 0.75 M to 0.25 M?

Correct Answer
verified

A reaction has an activation energy of 195.0 kJ/mol. When the temperature is increased from 200°C to 220°C, the rate constant will increase by a factor of

Correct Answer
verified

A catalyst lowers the activation energy but does not affect the mechanism of a reaction.

Correct Answer
verified

Sucrose decomposes to fructose and glucose in acid solution. When ln [sucrose] is plotted vs. time, a straight line with slope of −0.208 hr⁻¹ results. What is the rate law for the reaction?

Correct Answer
verified

The active ingredient in an over the counter pain killer analgesic decomposes with a rate constant, k = 9.05 × 10⁻⁴ day⁻¹. How many days does it take for 15% of the original ingredient to decompose?

Correct Answer
verified

In the lock and key model of enzyme action, the active site on the enzyme provides an exact fit for the substrate.

Correct Answer
verified

Carbon-14 is a radioactive isotope which decays with a half-life of 5730 years. What is the first-order rate constant for its decay, in units of years⁻¹?

Correct Answer
verified

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

Correct Answer
verified

A reaction is first-order with respect to the reactant R. Which of the following plots will produce a straight line?

Correct Answer
verified

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

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

Correct AnswerverifiedShow Answer

For the reaction A(g) + 2B(g) → 2C(g) + 2D(g) The following data were collected at constant temperature. Determine the correct rate law for this reaction.

Correct AnswerverifiedShow Answer

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which one of the following sets of units is appropriate for a third-order rate constant?

Correct AnswerverifiedShow Answer

The rate law for the reaction 3A → 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

Correct AnswerverifiedShow Answer

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

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

The rate constant for the reaction 3A → 4B is 6.00 × 10−3 L mol−1min−1. How long will it take the concentration of A to drop from 0.75 M to 0.25 M?

Correct AnswerverifiedShow Answer

A reaction has an activation energy of 195.0 kJ/mol. When the temperature is increased from 200°C to 220°C, the rate constant will increase by a factor of

Correct AnswerverifiedShow Answer

A catalyst lowers the activation energy but does not affect the mechanism of a reaction.

Correct AnswerverifiedShow Answer

Sucrose decomposes to fructose and glucose in acid solution. When ln [sucrose] is plotted vs. time, a straight line with slope of −0.208 hr−1 results. What is the rate law for the reaction?

Correct AnswerverifiedShow Answer

The active ingredient in an over the counter pain killer analgesic decomposes with a rate constant, k = 9.05 × 10−4 day−1. How many days does it take for 15% of the original ingredient to decompose?

Correct AnswerverifiedShow Answer

In the lock and key model of enzyme action, the active site on the enzyme provides an exact fit for the substrate.

Correct AnswerverifiedShow Answer

Carbon-14 is a radioactive isotope which decays with a half-life of 5730 years. What is the first-order rate constant for its decay, in units of years−1?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A reaction is first-order with respect to the reactant R. Which of the following plots will produce a straight line?

Correct AnswerverifiedShow Answer

A study of the decomposition reaction 3RS₂→ 3R + 6S yields the following initial rate data. What is the rate constant for 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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Correct Answer
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The rate law for the reaction 3A → 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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Correct Answer
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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 SOCl₂to drop from 0.36 M to 0.045 M?

Correct Answer
verified

The rate constant for the reaction 3A → 4B is 6.00 × 10⁻³ L mol⁻¹min⁻¹. How long will it take the concentration of A to drop from 0.75 M to 0.25 M?

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Sucrose decomposes to fructose and glucose in acid solution. When ln [sucrose] is plotted vs. time, a straight line with slope of −0.208 hr⁻¹ results. What is the rate law for the reaction?

Correct Answer
verified

The active ingredient in an over the counter pain killer analgesic decomposes with a rate constant, k = 9.05 × 10⁻⁴ day⁻¹. How many days does it take for 15% of the original ingredient to decompose?

Correct Answer
verified

Correct Answer
verified

Carbon-14 is a radioactive isotope which decays with a half-life of 5730 years. What is the first-order rate constant for its decay, in units of years⁻¹?

Correct Answer
verified

Correct Answer
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Correct Answer
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