Question 1

The rate of a ________-________ is a constant that is independent of reactant concentration.

Accepted Answer

zeroth-ord...

Question 2

What rate constant can be determined from only the half-life of a reaction?

Accepted Answer

A)   Zeroth
B)   First
C)   Second
D)   Third
E)   The rate constant cannot be determined using only a rate constant for any reaction.F) None of the above
G) B) and E)

Question 3

The compound RX3 decomposes according to the equation 3RX3 → R + R2X3 + 3X2
In an experiment the following data were collected for the decomposition at 100°C. What is the average rate of change of RX3 over the entire experiment? 3 decomposes according to the equation 3RX3 → R + R2X3 + 3X2 In an experiment the following data were collected for the decomposition at 100°C. What is the average rate of change of RX3 over the entire experiment?   A)  -0.011 mol • L-1 • s-1 B)  -0.019 mol • L-1 • s-1 C)  -0.044 mol • L-1 • s-1  D)  -0.049 mol • L-1 • s-1 E)  -0.069 mol • L-1 • s-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -0.011 mol • L-1 • s-1
B)   -0.019 mol • L-1 • s-1
C)   -0.044 mol • L-1 • s-1 
D)   -0.049 mol • L-1 • s-1
E)   -0.069 mol • L-1 • s-1F) A) and B)
G) A) and C)

Question 4

Consider the reaction 2NH3(g)  → N2(g)  + 3H2(g) 
If the rate Δ[H2]/Δt is 0.030 mol L-1 • s-1, what is Δ[NH3]/Δt?

Accepted Answer

A)   -0.045 mol L-1• s-1
B)   -0.030 mol L-1• s-1
C)   -0.020 mol L-1• s-1 
D)   -0.010 mol L-1• s-1
E)   None of these choices is correct.F) C) and D)
G) C) and E)

Question 5

What is the integrated rate law for a first-order reaction?

Accepted Answer

A)   rate = k[A]t
B)   t 
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   t 
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   t 
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   t 
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) C) and D)
G) A) and D)

Question 6

What is the molecularity of the following elementary reaction? NHCl2(aq)  + OH-(aq)  → NCl2-(aq)  +H2O(l)

Accepted Answer

A)   Unimolecular
B)   Bimolecular
C)   Termolecular
D)   Tetramolecular
E)   The reaction order is needed before the molecularity can be determined.F) A) and C)
G) A) and B)

Question 7

A reaction has the following rate law: rate = k[A][B]2
In experiment 1, the concentrations of A and B are both 0.10 mol • L-1; in experiment 2, the concentrations are both 0.30 mol • L-1. If the temperature stays constant, what is the value of the ratio, rate(2) /rate(1) ?

Accepted Answer

A)   3.0
B)   6.0
C)   9.0
D)   18
E)   27F) None of the above
G) D) and E)

Question 8

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) A) and E)
G) A) and D)

Question 9

A ________-________ is a reaction whose rate depends on the concentration of one of the reactants raised to the first power.

Accepted Answer

first-orde...

Question 10

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Accepted Answer

A) True 
 B)False

Question 11

Consider the following potential energy profile for the A → B reaction. The overall reaction is ________.

Accepted Answer

A)   endothermic
B)   exothermicC) A) and B)
D) undefined

Question 12

Accepted Answer

A)   Zeroth
B)   First
C)   Second
D)   Third
E)   Such a plot cannot reveal the order of the reaction.F) A) and C)
G) A) and B)

Question 13

What is the name given for the study of how fast reactions take place?

Accepted Answer

A)   Reaction rate
B)   Activation energy
C)   Chemical kinetics
D)   Reactivity
E)   Half-lifeF) None of the above
G) A) and E)

Question 14

The following diagram represents the first-order decomposition of A to form X according to the following balanced chemical equation: A → X. Each sphere represents 1.0 mmol of atoms, and the volume of the box is 1.0 L.  What is the half-life of the reaction?

Accepted Answer

A)   15 s
B)   30 s
C)   36 s
D)   45 s
E)   60 sF) C) and D)
G) D) and E)

Question 15

A transition state is a species (or state) corresponding to an energy maximum on a reaction energy diagram.

Accepted Answer

A) True 
 B)False

Question 16

A(n) ________ increases the reaction rate without being consumed.

Accepted Answer

The answer of A(n) ________ increases the reaction rate without...

Question 17

Which is true concerning the following potential energy diagram?

Accepted Answer

A)   This reaction is exothermic and has a positive activation energy.
B)   This reaction is endothermic and has a positive activation energy.
C)   This reaction is exothermic and has a negative activation energy.
D)   This reaction is endothermic and has a negative activation energy.
E)   This reaction is thermoneutral and has a zero activation energy.F) A) and C)
G) B) and E)

Question 18

Is a bimolecular reaction necessarily second-order? Is a second order reaction necessarily bimolecular? Answer, with explanations and clarifications.

Accepted Answer

For elementary reactions, the order foll...

Question 19

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

Accepted Answer

A)   t1/2 = k
B)   t1/2 = 1/k[A]o
C)   t1/2 = 0.693/k[A]o
D)   t1/2 = [A]o/2k
E)   t1/2 = 0.693/kF) A) and B)
G) A) and E)

Question 20

At 25°C the rate constant for the first-order decomposition of a pesticide solution is 6.40 × 10-3 min-1. If the starting concentration of pesticide is 0.0314 M, what concentration will remain after 62.0 min at 25°C?

Accepted Answer

A)   1.14 × 10-1 M
B)   47.4 M
C)   1.25 ×10-2 M
D)   2.11 × 10-2 M
E)   2.68 × 10-2 MF) C) and D)
G) A) and E)

Exam 14: Chemical Kinetics

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

The rate of a - is a constant that is independent of reactant concentration.

Correct Answer
verified
zeroth-ord...
View Answer

A transition state is a species (or state) corresponding to an energy maximum on a reaction energy diagram.

Correct Answer
verified

Consider the reaction 2NH₃(g) → N₂(g) + 3H₂(g) If the rate Δ[H₂]/Δt is 0.030 mol L^-1 • s^-1, what is Δ[NH₃]/Δt?

Correct Answer
verified

A(n) ________ increases the reaction rate without being consumed.

Correct Answer
verified

Consider the following potential energy profile for the A → B reaction. The overall reaction is ________.

Correct Answer
verified

What rate constant can be determined from only the half-life of a reaction?

Correct Answer
verified

A reaction has the following rate law: rate = k[A][B]² In experiment 1, the concentrations of A and B are both 0.10 mol • L^-1; in experiment 2, the concentrations are both 0.30 mol • L^-1. If the temperature stays constant, what is the value of the ratio, rate(2) /rate(1) ?

Correct Answer
verified

The following diagram represents the first-order decomposition of A to form X according to the following balanced chemical equation: A → X. Each sphere represents 1.0 mmol of atoms, and the volume of the box is 1.0 L. What is the half-life of the reaction?

Correct Answer
verified

What is the name given for the study of how fast reactions take place?

Correct Answer
verified

What is the integrated rate law for a first-order reaction?

Correct Answer
verified

Which is true concerning the following potential energy diagram?

Correct Answer
verified

A - is a reaction whose rate depends on the concentration of one of the reactants raised to the first power.

Correct Answer
verified
first-orde...
View Answer

Is a bimolecular reaction necessarily second-order? Is a second order reaction necessarily bimolecular? Answer, with explanations and clarifications.

Correct Answer
verified
For elementary reactions, the order foll...
View Answer

At 25°C the rate constant for the first-order decomposition of a pesticide solution is 6.40 × 10^-3 min^-1. If the starting concentration of pesticide is 0.0314 M, what concentration will remain after 62.0 min at 25°C?

Correct Answer
verified

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Correct Answer
verified

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

Correct Answer
verified

What is the molecularity of the following elementary reaction? NHCl₂(aq) + OH^-(aq) → NCl₂^-(aq) +H₂O(l)

Correct Answer
verified

Correct Answer
verified

The compound RX₃ decomposes according to the equation 3RX₃ → R + R₂X₃ + 3X₂ In an experiment the following data were collected for the decomposition at 100°C. What is the average rate of change of RX₃ over the entire experiment?

Correct Answer
verified

Exam 14: Chemical Kinetics

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

The rate of a ________-________ is a constant that is independent of reactant concentration.

Correct Answerverifiedzeroth-ord...View AnswerShow Answer

A transition state is a species (or state) corresponding to an energy maximum on a reaction energy diagram.

Correct AnswerverifiedShow Answer

Consider the reaction 2NH3(g) → N2(g) + 3H2(g) If the rate Δ[H2]/Δt is 0.030 mol L-1 • s-1, what is Δ[NH3]/Δt?

Correct AnswerverifiedShow Answer

A(n) ________ increases the reaction rate without being consumed.

Correct AnswerverifiedShow Answer

Consider the following potential energy profile for the A → B reaction. The overall reaction is ________.

Correct AnswerverifiedShow Answer

What rate constant can be determined from only the half-life of a reaction?

Correct AnswerverifiedShow Answer

A reaction has the following rate law: rate = k[A][B]2 In experiment 1, the concentrations of A and B are both 0.10 mol • L-1; in experiment 2, the concentrations are both 0.30 mol • L-1. If the temperature stays constant, what is the value of the ratio, rate(2) /rate(1) ?

Correct AnswerverifiedShow Answer

The following diagram represents the first-order decomposition of A to form X according to the following balanced chemical equation: A → X. Each sphere represents 1.0 mmol of atoms, and the volume of the box is 1.0 L. What is the half-life of the reaction?

Correct AnswerverifiedShow Answer

What is the name given for the study of how fast reactions take place?

Correct AnswerverifiedShow Answer

What is the integrated rate law for a first-order reaction?

Correct AnswerverifiedShow Answer

Which is true concerning the following potential energy diagram?

Correct AnswerverifiedShow Answer

A ________-________ is a reaction whose rate depends on the concentration of one of the reactants raised to the first power.

Correct Answerverifiedfirst-orde...View AnswerShow Answer

Is a bimolecular reaction necessarily second-order? Is a second order reaction necessarily bimolecular? Answer, with explanations and clarifications.

Correct AnswerverifiedFor elementary reactions, the order foll...View AnswerShow Answer

At 25°C the rate constant for the first-order decomposition of a pesticide solution is 6.40 × 10-3 min-1. If the starting concentration of pesticide is 0.0314 M, what concentration will remain after 62.0 min at 25°C?

Correct AnswerverifiedShow Answer

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the molecularity of the following elementary reaction? NHCl2(aq) + OH-(aq) → NCl2-(aq) +H2O(l)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The compound RX3 decomposes according to the equation 3RX3 → R + R2X3 + 3X2 In an experiment the following data were collected for the decomposition at 100°C. What is the average rate of change of RX3 over the entire experiment?

Correct AnswerverifiedShow Answer

Correct Answer
verified

The rate of a - is a constant that is independent of reactant concentration.

Correct Answer
verified
zeroth-ord...
View Answer

Correct Answer
verified

Consider the reaction 2NH₃(g) → N₂(g) + 3H₂(g) If the rate Δ[H₂]/Δt is 0.030 mol L^-1 • s^-1, what is Δ[NH₃]/Δt?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A reaction has the following rate law: rate = k[A][B]² In experiment 1, the concentrations of A and B are both 0.10 mol • L^-1; in experiment 2, the concentrations are both 0.30 mol • L^-1. If the temperature stays constant, what is the value of the ratio, rate(2) /rate(1) ?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A - is a reaction whose rate depends on the concentration of one of the reactants raised to the first power.

Correct Answer
verified
first-orde...
View Answer

Correct Answer
verified
For elementary reactions, the order foll...
View Answer

At 25°C the rate constant for the first-order decomposition of a pesticide solution is 6.40 × 10^-3 min^-1. If the starting concentration of pesticide is 0.0314 M, what concentration will remain after 62.0 min at 25°C?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the molecularity of the following elementary reaction? NHCl₂(aq) + OH^-(aq) → NCl₂^-(aq) +H₂O(l)

Correct Answer
verified

Correct Answer
verified

The compound RX₃ decomposes according to the equation 3RX₃ → R + R₂X₃ + 3X₂ In an experiment the following data were collected for the decomposition at 100°C. What is the average rate of change of RX₃ over the entire experiment?

Correct Answer
verified