Question 1

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 t...

Question 2

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) B) and E)
G) B) and D)

Question 3

For the reaction C6H14(g) → C6H6(g) + 4H2(g) ,ΔP(H2) /Δt was found to be 2.5 × 10-2 atm/s, where ΔP(H2) is the change in pressure of hydrogen.Determine ΔP(C6H14) /Δt for this reaction at the same time.

Accepted Answer

A)  2.5 × 10-2 atm/s
B)  -6.3 × 10-3 atm/s
C)  -2.5 × 10-2 atm/s
D)  0.10 atm/s
E)  6.3 × 10-3 atm/sF) B) and C)
G) A) and E)

Question 4

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 B)
G) All 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.   Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)  A) 4.0 kJ/mol B) 5.0 kJ/mol C) 40 kJ/mol D) 42 kJ/mol E) 50 kJ/mol" class="answers-bank-image d-inline" rel="preload" > Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)

Accepted Answer

A)  4.0 kJ/mol
B)  5.0 kJ/mol
C)  40 kJ/mol
D)  42 kJ/mol
E)  50 kJ/molF) D) and E)
G) A) and D)

Question 6

When the reaction A → B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction with respect to A?

Accepted Answer

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

Question 7

What is the activation energy for a reaction if k = 1.89 × 10-8 s-1 at 540.K and k = 2.45 × 10-7 s-1 at 601 K?

Accepted Answer

A)  113 kJ/mol
B)  83 kJ/mol
C)  410 kJ/mol
D)  280 kJ/mol
E)  580 kJ/molF) A) and B)
G) A) and C)

Question 8

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) All of the above

Question 9

For each of the following terms/concepts,give a brief explanation or definition.

Accepted Answer

a.order of a reaction b.elementary react...

Question 10

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

Accepted Answer

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

Question 11

Sulfuryl chloride,SO2Cl2(g) ,decomposes at high temperature to form SO2(g) and Cl2(g) .The rate constant at a certain temperature is 4.68 × 10-5 s-1.What is the 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) A) and B)
G) B) and D)

Question 12

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)  0.88
C)  0.75
D)  0.13
E)  0.063F) B) and C)
G) A) and D)

Question 13

Which equation best describes the average rate for the reaction shown? A(aq) + B(aq) → C(aq) + D(aq)

Accepted Answer

A)  rate = [C][D][A][B]
B)  rate = +Δ[B]/Δt
C)  rate = -Δ[C]/Δt
D)  rate = -Δ[A]/Δt
E)  rate = [A][B][C][D]F) None of the above
G) C) and D)

Question 14

What is defined as the minimum amount of energy required to initiate a chemical reaction?

Accepted Answer

A)  Collision energy
B)  Effective collision energy
C)  Reaction energy
D)  Activation energy
E)  Rate energyF) C) and D)
G) None of the above

Exam 14: Chemical Kinetics

Which equation best describes the average rate for the reaction shown? A(aq) + B(aq) → C(aq) + D(aq)

Correct Answer
verified

For each of the following terms/concepts,give a brief explanation or definition.

Correct Answer
verified
a.order of a reaction b.elementary react...
View Answer

For the reaction C₆H₁₄(g) → C₆H₆(g) + 4H₂(g) ,ΔP(H₂) /Δt was found to be 2.5 × 10^-2 atm/s, where ΔP(H₂) is the change in pressure of hydrogen.Determine ΔP(C₆H₁₄) /Δt for this reaction at the same time.

Correct Answer
verified

Sulfuryl chloride,SO₂Cl₂(g) ,decomposes at high temperature to form SO₂(g) and Cl₂(g) .The rate constant at a certain temperature is 4.68 × 10^-5 s^-1.What is the order of the reaction?

Correct Answer
verified

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
verified

When the reaction A → B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction with respect to A?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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 t...
View Answer

What is the activation energy for a reaction if k = 1.89 × 10^-8 s^-1 at 540.K and k = 2.45 × 10^-7s^-1 at 601 K?

Correct Answer
verified

What is defined as the minimum amount of energy required to initiate a chemical reaction?

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

Which is true concerning the following potential energy diagram?

Correct Answer
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The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s^-1. Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)

Correct Answer
verified

Exam 14: Chemical Kinetics

Which equation best describes the average rate for the reaction shown? A(aq) + B(aq) → C(aq) + D(aq)

Correct AnswerverifiedShow Answer

For each of the following terms/concepts,give a brief explanation or definition.

Correct Answerverifieda.order of a reaction b.elementary react...View AnswerShow Answer

For the reaction C6H14(g) → C6H6(g) + 4H2(g) ,ΔP(H2) /Δt was found to be 2.5 × 10-2 atm/s, where ΔP(H2) is the change in pressure of hydrogen.Determine ΔP(C6H14) /Δt for this reaction at the same time.

Correct AnswerverifiedShow Answer

Sulfuryl chloride,SO2Cl2(g) ,decomposes at high temperature to form SO2(g) and Cl2(g) .The rate constant at a certain temperature is 4.68 × 10-5 s-1.What is the order of the 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

When the reaction A → B + C is studied,a plot of ln[A]t vs.time gives a straight line with a negative slope.What is the order of the reaction with respect to A?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow 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 t...View AnswerShow Answer

What is the activation energy for a reaction if k = 1.89 × 10-8 s-1 at 540.K and k = 2.45 × 10-7 s-1 at 601 K?

Correct AnswerverifiedShow Answer

What is defined as the minimum amount of energy required to initiate a chemical reaction?

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

Which is true concerning the following potential energy diagram?

Correct AnswerverifiedShow Answer

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s-1. Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
a.order of a reaction b.elementary react...
View Answer

For the reaction C₆H₁₄(g) → C₆H₆(g) + 4H₂(g) ,ΔP(H₂) /Δt was found to be 2.5 × 10^-2 atm/s, where ΔP(H₂) is the change in pressure of hydrogen.Determine ΔP(C₆H₁₄) /Δt for this reaction at the same time.

Correct Answer
verified

Sulfuryl chloride,SO₂Cl₂(g) ,decomposes at high temperature to form SO₂(g) and Cl₂(g) .The rate constant at a certain temperature is 4.68 × 10^-5 s^-1.What is the order of the reaction?

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

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 t...
View Answer

What is the activation energy for a reaction if k = 1.89 × 10^-8 s^-1 at 540.K and k = 2.45 × 10^-7s^-1 at 601 K?

Correct Answer
verified

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. Based on this Arrhenius plot,what is the activation energy of the reaction? (R = 8.314 J/K •mol)

Correct Answer
verified