Question 1

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr-1. What fraction of the tritium initially in a sample is still present 30. years later?

Accepted Answer

A)   0.19
B)   0.60
C)   0.15
D)   2.8 × 10-38
E)   0.81F) B) and C)
G) A) and C)

Question 2

The first-order reaction SO2Cl2→ SO2 + Cl2 is 10% complete in 80. min. How long would it take for the reaction to be 95% complete?

Accepted Answer

A)   1.8 min
B)   104 min
C)   530 min
D)   2300 min
E)   990 minF) C) and E)
G) B) and D)

Question 3

What is the half-life for a first-order reaction?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) B) and D)
G) C) and E) E

Question 4

For the reaction 3A(g)  + 2B(g)  → 2C(g)  + 2D(g) 
The following data were collected at constant temperature. Determine the correct rate law for this reaction. 2 C)  Rate = k[A]3[B]2 D)  Rate = k[A]1.5[B] E)  Rate = k[A]2[B]" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Rate = k[A][B]
B)   Rate = k[A][B]2
C)   Rate = k[A]3[B]2
D)   Rate = k[A]1.5[B]
E)   Rate = k[A]2[B]F) B) and C)
G) A) and B)

Question 5

Which of the following is the correct unit for a second-order rate constant?

Accepted Answer

A)   s-1
B)   M • s-1
C)   M • s
D)   M -1 • s-1
E)   M -2 • s-1F) None of the above
G) A) and E)

Question 6

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?

Accepted Answer

A)   5.25 × 10-5 yr-1
B)   1.21 × 10-4 yr-1
C)   1.75 × 10-4 yr-1 
D)   3.49 × 10-4 yr-1
E)   3.97 × 103 yr-1F) A) and B)
G) C) and D)

Question 7

The data below were determined for the reaction S2O82-(aq)  + 3I-(aq)  → 2SO42-(aq)  + I3-(aq) . 2O82-(aq)  + 3I-(aq)  → 2SO42-(aq)  + I3-(aq) .   Which rate law is consistent with the experimental data for this reaction? A)  rate = k[S2O82- ][I -]3 B)  rate = k[S2O82-] C)  rate = k[S2O82-]2[I -]2 D)  rate = k[I -] E)  rate = k[S2O82-][I -]" class="answers-bank-image d-inline" rel="preload" > Which rate law is consistent with the experimental data for this reaction?

Accepted Answer

A)   rate = k[S2O82- ][I -]3
B)   rate = k[S2O82-]
C)   rate = k[S2O82-]2[I -]2
D)   rate = k[I -]
E)   rate = k[S2O82-][I -]F) A) and B)
G) All of the above

Question 8

Which is the correct unit for a zeroth-order rate constant?

Accepted Answer

A)   s-1
B)   M • s-1
C)   M • s
D)   M-1 • s-1
E)   M-2 • s-1F) B) and D)
G) A) and B) B

Question 9

The rate law for the rearrangement of CH3NC to CH3CN at 800 K is rate = (1300 s-1) [CH3NC]. What is the half-life for this reaction?

Accepted Answer

A)   7.69 × 10-4 s
B)   5.3 × 10-4 s
C)   1.9 × 10-3 s
D)   520 s
E)   1920 sF) C) and D)
G) D) and E)

Question 10

Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10-2 h-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

Accepted Answer

A)   0.046 M
B)   0.11 M
C)   0.13 M
D)   0.49 M
E)   0.054 MF) A) and B)
G) B) and D) A

Question 11

The reaction A + 2B → Products was found to have the rate law, rate = k[A][B]2. Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

Accepted Answer

A)   2
B)   4
C)   6
D)   8
E)   9F) D) and E)
G) A) and D)

Question 12

For a zeroth-order reaction, if the concentration of reactant A is plotted vs. time, which corresponds to the slope of this plot?

Accepted Answer

A)   1/[A]
B)   k
C)   1/k
D)   ln[A]
E)   -kF) D) and E)
G) All of the above

Question 13

Nitric oxide gas (NO)  reacts with chlorine gas according to the equation NO + 2 → NOCl. The following initial rates of reaction have been measured for the given reagent concentrations.   Which of the following is the rate law for this reaction? A)  rate = k[NO] B)  rate = k[NO][Cl2]1/2 C)  rate = k[NO][Cl2] D)  rate = k[NO]2[Cl2] E)  rate = k[NO]2[Cl2]2" class="answers-bank-image d-inline" rel="preload" > Cl2 → NOCl.
The following initial rates of reaction have been measured for the given reagent concentrations. 2 → NOCl. The following initial rates of reaction have been measured for the given reagent concentrations.   Which of the following is the rate law for this reaction? A)  rate = k[NO] B)  rate = k[NO][Cl2]1/2 C)  rate = k[NO][Cl2] D)  rate = k[NO]2[Cl2] E)  rate = k[NO]2[Cl2]2" class="answers-bank-image d-inline" rel="preload" > Which of the following is the rate law for this reaction?

Accepted Answer

A)   rate = k[NO]
B)   rate = k[NO][Cl2]1/2
C)   rate = k[NO][Cl2]
D)   rate = k[NO]2[Cl2]
E)   rate = k[NO]2[Cl2]2F) B) and E)
G) A) and B)

Question 14

Consider the following potential energy profile for the A → B reaction. How many elementary steps are there?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and B)
G) None of the above

Question 15

The elementary step of the reaction mechanism which only involves one reactant is called ________.

Accepted Answer

The answer of The elementary step of the reaction mechanism...

Question 16

The oxidation of iodide ions by arsenic acid in acidic aqueous solution occurs according to the net reaction H3AsO4 + 3I - + 2H3O +→ H3AsO3 + I3- + 3H2O. The experimental rate law for this reaction is
Rate = k [H3AsO4] [I-] [H3O+].
According to the rate law for the reaction, an increase in the concentration of hydronium ion has what effect on this reaction?

Accepted Answer

The rate o...

Question 17

The reaction A + 2B → Products was found to follow the rate law: rate = k[A]2[B]. Predict by what factor the rate of reaction will increase when the concentration of A is doubled, the concentration of B is tripled, and the temperature remains constant.

Accepted Answer

A)   5
B)   6
C)   12
D)   18
E)   None of theseF) None of the above
G) A) and E)

Question 18

A ________-________ is a reaction whose rate depends on the concentration of one of the reactants squared.

Accepted Answer

second-ord...

Question 19

In the collision theory of reaction rates, the rate constant for a bimolecular reaction can be written as
k = A•exp(-Ea/RT)
Briefly explain the physical meaning (interpretation) of the following factors which appear in the above expression:
a. A
b. exp(-Ea/RT)

Accepted Answer

a. the collision frequency or ...

Question 20

What are possible units for the rate of a reaction?

Accepted Answer

A)   L • mol-1 • s-1
B)   L2 • mol-2 • s-1
C)   s-1
D)   s-2
E)   mol • L-1 • s-1F) A) and E)
G) All of the above

Exam 14: Chemical Kinetics

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr^-1. What fraction of the tritium initially in a sample is still present 30. years later?

Correct Answer
verified

The first-order reaction SO₂Cl₂→ SO₂ + Cl₂ is 10% complete in 80. min. How long would it take for the reaction to be 95% complete?

Correct Answer
verified

What is the half-life for a first-order reaction?

Correct Answer
verified
E

For the reaction 3A(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
verified

Which of the following is the correct unit for a second-order rate constant?

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?

Correct Answer
verified

The data below were determined for the reaction S₂O₈^2-(aq) + 3I^-(aq) → 2SO₄^2-(aq) + I₃^-(aq) . Which rate law is consistent with the experimental data for this reaction?

Correct Answer
verified

Which is the correct unit for a zeroth-order rate constant?

Correct Answer
verified
B

The rate law for the rearrangement of CH₃NC to CH₃CN at 800 K is rate = (1300 s^-1) [CH₃NC]. What is the half-life for this reaction?

Correct Answer
verified

Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10^-2 h^-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

Correct Answer
verified
A

The reaction A + 2B → Products was found to have the rate law, rate = k[A][B]². Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

Correct Answer
verified

For a zeroth-order reaction, if the concentration of reactant A is plotted vs. time, which corresponds to the slope of this plot?

Correct Answer
verified

Nitric oxide gas (NO) reacts with chlorine gas according to the equation NO + Cl₂→ NOCl. The following initial rates of reaction have been measured for the given reagent concentrations. Which of the following is the rate law for this reaction?

Correct Answer
verified

Consider the following potential energy profile for the A → B reaction. How many elementary steps are there?

Correct Answer
verified

The elementary step of the reaction mechanism which only involves one reactant is called ________.

Correct Answer
verified

Correct Answer
verified
The rate o...
View Answer

The reaction A + 2B → Products was found to follow the rate law: rate = k[A]²[B]. Predict by what factor the rate of reaction will increase when the concentration of A is doubled, the concentration of B is tripled, and the temperature remains constant.

Correct Answer
verified

A - is a reaction whose rate depends on the concentration of one of the reactants squared.

Correct Answer
verified
second-ord...
View Answer

In the collision theory of reaction rates, the rate constant for a bimolecular reaction can be written as k = A•exp(-E_a/RT) Briefly explain the physical meaning (interpretation) of the following factors which appear in the above expression: a. A b. exp(-E_a/RT)

Correct Answer
verified
a. the collision frequency or ...
View Answer

What are possible units for the rate of a reaction?

Correct Answer
verified

Exam 14: Chemical Kinetics

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr-1. What fraction of the tritium initially in a sample is still present 30. years later?

Correct AnswerverifiedShow Answer

The first-order reaction SO2Cl2→ SO2 + Cl2 is 10% complete in 80. min. How long would it take for the reaction to be 95% complete?

Correct AnswerverifiedShow Answer

What is the half-life for a first-order reaction?

Correct AnswerverifiedE

For the reaction 3A(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

Which of the following is the correct unit for a second-order rate constant?

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?

Correct AnswerverifiedShow Answer

The data below were determined for the reaction S2O82-(aq) + 3I-(aq) → 2SO42-(aq) + I3-(aq) . Which rate law is consistent with the experimental data for this reaction?

Correct AnswerverifiedShow Answer

Which is the correct unit for a zeroth-order rate constant?

Correct AnswerverifiedB

The rate law for the rearrangement of CH3NC to CH3CN at 800 K is rate = (1300 s-1) [CH3NC]. What is the half-life for this reaction?

Correct AnswerverifiedShow Answer

Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10-2 h-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

Correct AnswerverifiedA

The reaction A + 2B → Products was found to have the rate law, rate = k[A][B]2. Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

Correct AnswerverifiedShow Answer

For a zeroth-order reaction, if the concentration of reactant A is plotted vs. time, which corresponds to the slope of this plot?

Correct AnswerverifiedShow Answer

Nitric oxide gas (NO) reacts with chlorine gas according to the equation NO + Cl2 → NOCl. The following initial rates of reaction have been measured for the given reagent concentrations. Which of the following is the rate law for this reaction?

Correct AnswerverifiedShow Answer

Consider the following potential energy profile for the A → B reaction. How many elementary steps are there?

Correct AnswerverifiedShow Answer

The elementary step of the reaction mechanism which only involves one reactant is called ________.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedThe rate o...View AnswerShow Answer

The reaction A + 2B → Products was found to follow the rate law: rate = k[A]2[B]. Predict by what factor the rate of reaction will increase when the concentration of A is doubled, the concentration of B is tripled, and the temperature remains constant.

Correct AnswerverifiedShow Answer

A ________-________ is a reaction whose rate depends on the concentration of one of the reactants squared.

Correct Answerverifiedsecond-ord...View AnswerShow Answer

In the collision theory of reaction rates, the rate constant for a bimolecular reaction can be written as k = A•exp(-Ea/RT) Briefly explain the physical meaning (interpretation) of the following factors which appear in the above expression: a. A b. exp(-Ea/RT)

Correct Answerverifieda. the collision frequency or ...View AnswerShow Answer

What are possible units for the rate of a reaction?

Correct AnswerverifiedShow Answer

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr^-1. What fraction of the tritium initially in a sample is still present 30. years later?

Correct Answer
verified

The first-order reaction SO₂Cl₂→ SO₂ + Cl₂ is 10% complete in 80. min. How long would it take for the reaction to be 95% complete?

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The data below were determined for the reaction S₂O₈^2-(aq) + 3I^-(aq) → 2SO₄^2-(aq) + I₃^-(aq) . Which rate law is consistent with the experimental data for this reaction?

Correct Answer
verified

Correct Answer
verified
B

The rate law for the rearrangement of CH₃NC to CH₃CN at 800 K is rate = (1300 s^-1) [CH₃NC]. What is the half-life for this reaction?

Correct Answer
verified

Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10^-2 h^-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

Correct Answer
verified
A

The reaction A + 2B → Products was found to have the rate law, rate = k[A][B]². Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

Correct Answer
verified

Correct Answer
verified

Nitric oxide gas (NO) reacts with chlorine gas according to the equation NO + Cl₂→ NOCl. The following initial rates of reaction have been measured for the given reagent concentrations. Which of the following is the rate law for this reaction?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The rate o...
View Answer

The reaction A + 2B → Products was found to follow the rate law: rate = k[A]²[B]. Predict by what factor the rate of reaction will increase when the concentration of A is doubled, the concentration of B is tripled, and the temperature remains constant.

Correct Answer
verified

A - is a reaction whose rate depends on the concentration of one of the reactants squared.

Correct Answer
verified
second-ord...
View Answer

In the collision theory of reaction rates, the rate constant for a bimolecular reaction can be written as k = A•exp(-E_a/RT) Briefly explain the physical meaning (interpretation) of the following factors which appear in the above expression: a. A b. exp(-E_a/RT)

Correct Answer
verified
a. the collision frequency or ...
View Answer

Correct Answer
verified