Question 1

The rate law for the reaction H2O2 + 2H+ + 2I- → I2 + 2H2O is rate = k[H2O2][I-].The following mechanism has been suggested. H2O2 + I- → HOI + OH- (slow) 
OH- + H+ → H2O (fast) 
HOI + H+ + I- → I2 + H2O (fast) 
Identify all intermediates included in this mechanism.

Accepted Answer

A)  H+and I-
B)  H+ and HOI
C)  HOI and OH-
D)  H+only
E)  H2O and OH-F) D) and E)
G) A) and C)

Question 2

A certain first-order reaction A → B is 25% complete in 42 min at 25°C.What is its rate constant?

Accepted Answer

A)  6.8 × 10-3 min-1
B)  8.3 × 10-3 min-1
C)  3.3 × 10-2 min-1
D)  -3.3 × 10-2 min-1
E)  11 min-1F) B) and D)
G) B) and E)

Question 3

A catalyst increases the rate of the reaction and is recovered completely at the end of the reaction.

Accepted Answer

A) True 
 B)False

Question 4

For the overall chemical reaction shown below,which one of the following statements can be rightly assumed? 2 H2S(g) + O2(g) → 2S(s) + 2H2O(l)

Accepted Answer

A)  The reaction is third-order overall.
B)  The reaction is second-order overall.
C)  The rate law is: rate = k[H2S]2 [O2].
D)  The rate law is: rate = k[H2S] [O2].
E)  The rate law cannot be determined from the information given.F) D) and E)
G) None of the above

Question 5

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s-1. -1.   If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction? A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction?

Accepted Answer

A)   -1.   If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   -1.   If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   -1.   If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   -1.   If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   -1.   If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) A) and E)
G) None of the above

Question 6

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) A) and B)
G) A) and C)

Question 7

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 8

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

Accepted Answer

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

Question 9

Consider the reaction 2NH3(g) → N2(g) + 3 H2 (g) 
If the rate Δ[H2]/Δt is 0.030 mol L-1 • s-1,what is Δ[N H3]/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) A) and E)
G) B) and D)

Question 10

The following diagram represents the second-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) B) and C)
G) All of the above

Question 11

______________ describes the reaction rate as being directly proportional to the number of molecular collisions per second.

Accepted Answer

The answer of ______________ describes the reaction rate as being...

Question 12

The rate constant for a reaction is 4.65 L • mol-1 • s-1.What is the overall order of the reaction?

Accepted Answer

A)  Zero
B)  First
C)  Second
D)  Third
E)  More information is needed to determine the overall order.F) C) and D)
G) C) and E)

Question 13

The elementary reaction HBr(g)+ Br(g)→ H(g)+ Br2 (g)is endothermic.

Accepted Answer

Would you expect the rate constant for t...

Question 14

What statement below best describes the graph representing the integrated second-order rate law?

Accepted Answer

A)  A plot of [A]t vs.t yields a straight line with a negative slope equal to -k.
B)  A plot of 1/[A]t vs.t yields a straight line with a negative slope equal to k.
C)  A plot of ln[A]t vs.t yields a straight line with a positive slope equal to -k.
D)  A plot of ln[A]t vs.t yields a straight line with a negative slope equal to -k.
E)  A plot of 1/[A]t vs.t yields a straight line with a positive slope equal to k.F) C) and D)
G) A) and E)

Question 15

A rate constant obeys the Arrhenius equation,the factor A being 2.2 × 1013 s-1 and the activation energy being 150.kJ mol-1.What is the value of the rate constant at 227°C? (R = 8.314 J/mol• K)

Accepted Answer

A)  2.1 × 1013 s-1
B)  6.7 × 10-22 s-1
C)  1.5 × 1011 s-1
D)  4.7 × 10-3 s-1
E)  1.0 × 1029 s-1F) None of the above
G) A) and D)

Question 16

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) None of the above
G) B) and E)

Question 17

The reaction A + 2B → products has the rate law,rate = k[A][B]3.If the concentration of B is doubled while that of A is unchanged,by what factor will the rate of reaction increase?

Accepted Answer

A)  2
B)  4
C)  6
D)  8
E)  9F) A) and B)
G) All of the above

Question 18

A first-order reaction has a rate constant of 7.5 × 10-3 s-1.The time required for the reaction to be 60% complete is?

Accepted Answer

A)  3.8 × 10-3 s
B)  6.9 × 10-3 s
C)  68 s
D)  120 s
E)  130 sF) A) and D)
G) A) and C)

Question 19

The intermediate in a reaction appears in the mechanism of the reaction and in the overall balanced equation.

Accepted Answer

A) True 
 B)False

Question 20

The _______________ is the rate for a specific instant in time.

Accepted Answer

The answer of The _______________ is the rate for a...

Exam 14: Chemical Kinetics

A rate constant obeys the Arrhenius equation,the factor A being 2.2 × 10¹³ s^-1 and the activation energy being 150.kJ mol^-1.What is the value of the rate constant at 227°C? (R = 8.314 J/mol• K)

Correct Answer
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The intermediate in a reaction appears in the mechanism of the reaction and in the overall balanced equation.

Correct Answer
verified

Consider the reaction 2NH₃(g) → N₂(g) + 3 H₂ (g) If the rate Δ[H₂]/Δt is 0.030 mol L^-1 • s^-1,what is Δ[N H₃]/Δt?

Correct Answer
verified

For the overall chemical reaction shown below,which one of the following statements can be rightly assumed? 2 H₂S(g) + O₂(g) → 2S(s) + 2H₂O(l)

Correct Answer
verified

A catalyst increases the rate of the reaction and is recovered completely at the end of the reaction.

Correct Answer
verified

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

Correct Answer
verified

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s^-1. If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction?

Correct Answer
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The reaction A + 2B → products has the rate law,rate = k[A][B]³.If the concentration of B is doubled while that of A is unchanged,by what factor will the rate of reaction increase?

Correct Answer
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______________ describes the reaction rate as being directly proportional to the number of molecular collisions per second.

Correct Answer
verified

What statement below best describes the graph representing the integrated second-order rate law?

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
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The rate constant for a reaction is 4.65 L • mol^-1 • s^-1.What is the overall order of the reaction?

Correct Answer
verified

A certain first-order reaction A → B is 25% complete in 42 min at 25°C.What is its rate constant?

Correct Answer
verified

A first-order reaction has a rate constant of 7.5 × 10^-3 s^-1.The time required for the reaction to be 60% complete is?

Correct Answer
verified

The following diagram represents the second-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

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

The _______________ is the rate for a specific instant in time.

Correct Answer
verified

The elementary reaction HBr(g)+ Br(g)→ H(g)+ Br₂ (g)is endothermic.

Correct Answer
verified
Would you expect the rate constant for t...
View Answer

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

Correct Answer
verified

Exam 14: Chemical Kinetics

A rate constant obeys the Arrhenius equation,the factor A being 2.2 × 1013 s-1 and the activation energy being 150.kJ mol-1.What is the value of the rate constant at 227°C? (R = 8.314 J/mol• K)

Correct AnswerverifiedShow Answer

The intermediate in a reaction appears in the mechanism of the reaction and in the overall balanced equation.

Correct AnswerverifiedShow Answer

Consider the reaction 2NH3(g) → N2(g) + 3 H2 (g) If the rate Δ[H2]/Δt is 0.030 mol L-1 • s-1,what is Δ[N H3]/Δt?

Correct AnswerverifiedShow Answer

For the overall chemical reaction shown below,which one of the following statements can be rightly assumed? 2 H2S(g) + O2(g) → 2S(s) + 2H2O(l)

Correct AnswerverifiedShow Answer

A catalyst increases the rate of the reaction and is recovered completely at the end of the reaction.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s-1. If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction?

Correct AnswerverifiedShow Answer

The reaction A + 2B → products has the rate law,rate = k[A][B]3.If the concentration of B is doubled while that of A is unchanged,by what factor will the rate of reaction increase?

Correct AnswerverifiedShow Answer

______________ describes the reaction rate as being directly proportional to the number of molecular collisions per second.

Correct AnswerverifiedShow Answer

What statement below best describes the graph representing the integrated second-order rate law?

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

The rate law for the reaction H2O2 + 2H+ + 2I- → I2 + 2H2O is rate = k[H2O2][I-].The following mechanism has been suggested. H2O2 + I- → HOI + OH- (slow) OH- + H+ → H2O (fast) HOI + H+ + I- → I2 + H2O (fast) Identify all intermediates included in this mechanism.

Correct AnswerverifiedShow Answer

The rate constant for a reaction is 4.65 L • mol-1 • s-1.What is the overall order of the reaction?

Correct AnswerverifiedShow Answer

A certain first-order reaction A → B is 25% complete in 42 min at 25°C.What is its rate constant?

Correct AnswerverifiedShow Answer

A first-order reaction has a rate constant of 7.5 × 10-3 s-1.The time required for the reaction to be 60% complete is?

Correct AnswerverifiedShow Answer

The following diagram represents the second-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

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

The _______________ is the rate for a specific instant in time.

Correct AnswerverifiedShow Answer

The elementary reaction HBr(g)+ Br(g)→ H(g)+ Br2 (g)is endothermic.

Correct AnswerverifiedWould you expect the rate constant for t...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

A rate constant obeys the Arrhenius equation,the factor A being 2.2 × 10¹³ s^-1 and the activation energy being 150.kJ mol^-1.What is the value of the rate constant at 227°C? (R = 8.314 J/mol• K)

Correct Answer
verified

Correct Answer
verified

Consider the reaction 2NH₃(g) → N₂(g) + 3 H₂ (g) If the rate Δ[H₂]/Δt is 0.030 mol L^-1 • s^-1,what is Δ[N H₃]/Δt?

Correct Answer
verified

For the overall chemical reaction shown below,which one of the following statements can be rightly assumed? 2 H₂S(g) + O₂(g) → 2S(s) + 2H₂O(l)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s^-1. If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction?

Correct Answer
verified

The reaction A + 2B → products has the rate law,rate = k[A][B]³.If the concentration of B is doubled while that of A is unchanged,by what factor will the rate of reaction increase?

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

The rate constant for a reaction is 4.65 L • mol^-1 • s^-1.What is the overall order of the reaction?

Correct Answer
verified

Correct Answer
verified

A first-order reaction has a rate constant of 7.5 × 10^-3 s^-1.The time required for the reaction to be 60% complete is?

Correct Answer
verified

Correct Answer
verified

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

The elementary reaction HBr(g)+ Br(g)→ H(g)+ Br₂ (g)is endothermic.

Correct Answer
verified
Would you expect the rate constant for t...
View Answer

Correct Answer
verified