Question 1

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 2

Consider the following potential energy profile for the A → B reaction. Assuming that the frequency factor for the reaction is 5.5 × 1010 s-1, what is the rate constant of this first-order reaction at 310 K? 10 s-1, what is the rate constant of this first-order reaction at 310 K?   A)  2 × 102 s-1 B)  5 × 105 s-1 C)  1 × 1019 s-1 D)  2 × 107 s-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   2 × 102 s-1
B)   5 × 105 s-1
C)   1 × 1019 s-1
D)   2 × 107 s-1E) C) and D)
F) All of the above

Question 3

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) None of the above
G) All of the above

Question 4

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+].
What is the order of the reaction with respect to I-?

Accepted Answer

Question 5

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) B) and E)
G) A) and B)

Question 6

The reaction CH3NC(g)  → CH3CN(g)  is first order with respect to methyl isocyanide, CH3NC. If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react, what is the rate constant in units of min-1?

Accepted Answer

A)   -0.135 min-1
B)   0.0279 min-1
C)   0.089 min-1 
D)   0.135 min-1
E)   35.8 min-1F) A) and B)
G) B) and E)

Question 7

The units of the rate constant depend on the order of the reaction.

Accepted Answer

A) True 
 B)False

Question 8

According to the collision theory of reaction rates, what are the three requirements which must be met before an elementary reaction between two molecules can occur?

Accepted Answer

Molecules must collide with ea...

Question 9

A first-order reaction has a rate constant of 3.00 × 10-3 s-1. The time required for the reaction to be 75.0% complete is

Accepted Answer

A)   95.8 s.
B)   462 s.
C)   231 s.
D)   201 s.
E)   41.7 s.F) B) and C)
G) A) and B)

Question 10

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) C) and D)
G) A) and D)

Question 11

For the chemical reaction A → C, a plot of 1/[A]t versus time was found to give a straight line with a positive slope. What is the order of reaction?

Accepted Answer

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

Question 12

The ________ is the name given to the sequence of steps that sum to give the overall reaction.

Accepted Answer

The answer of The ________ is the name given to...

Question 13

The elementary reaction HBr(g) + Br(g) → H(g) + Br2 (g) is endothermic.
Would you expect the rate constant for the back reaction to be smaller or larger than that for the forward reaction? Explain, briefly.

Accepted Answer

The back reaction is exothermic. Since t...

Question 14

For the reaction 2A + B + 2C → D + E
The following initial rate data were collected at constant temperature. What is the correct rate law for this reaction? 2[B][C] C)  Rate = k [A]2[B][C]-1 D)  Rate = k [A][B]2[C]-1 E)  None of these choices is correct." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Rate = k [A][B][C]
B)   Rate = k [A]2[B][C]
C)   Rate = k [A]2[B][C]-1
D)   Rate = k [A][B]2[C]-1
E)   None of these choices is correct.F) D) and E)
G) A) and E)

Question 15

The activation energy for the following reaction is 60. kJ/mol. Sn2+ + 2Co3+ → Sn4+ + 2Co2+
By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Accepted Answer

A)   1.002
B)   4.6
C)   5.6
D)   2.8
E)   696F) A) and B)
G) A) and C)

Question 16

The rate law for the reaction 3A → 2B is rate = k[A] with a rate constant of 0.0447 h-1. What is the half-life of the reaction?

Accepted Answer

A)   0.0224 h
B)   0.0645 h
C)   15.5 h
D)   22.4 h
E)   44.7 hF) A) and E)
G) None of the above

Question 17

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) A) and B)
G) B) and D)

Question 18

Consider the following potential energy profile for the A → B reaction. How many intermediates are formed?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and E)
G) A) and D)

Question 19

What is the rate expression for the production of X, which is a gas, at constant volume?

Accepted Answer

A)   rate = PgVΔ[X]/RΔt
B)   rate = -TΔ[X]/PgVΔt
C)   rate = -PgV(Δ[X]/TΔt) 
D)   rate = (1/RT) (ΔPX/Δt) 
E)   rate = (1/RΔPX) (VT/Δt) F) All of the above
G) A) and B)

Question 20

It takes 42.0 min for the concentration of a reactant in a first-order reaction to drop from 0.45 M to 0.32 M at 25°C. How long will it take for the reaction to be 90% complete?

Accepted Answer

A)   13.0 min
B)   86.0 min
C)   137 min
D)   222 min
E)   284 minF) None of the above
G) A) and E)

Exam 14: Chemical Kinetics

The units of the rate constant depend on the order of the reaction.

Correct Answer
verified

According to the collision theory of reaction rates, what are the three requirements which must be met before an elementary reaction between two molecules can occur?

Correct Answer
verified
Molecules must collide with ea...
View Answer

The elementary reaction HBr(g) + Br(g) → H(g) + Br₂ (g) is endothermic. Would you expect the rate constant for the back reaction to be smaller or larger than that for the forward reaction? Explain, briefly.

Correct Answer
verified
The back reaction is exothermic. Since t...
View Answer

The activation energy for the following reaction is 60. kJ/mol. Sn²⁺ + 2Co³⁺→ Sn⁴⁺ + 2Co²⁺ By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Correct Answer
verified

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

For the chemical reaction A → C, a plot of 1/[A]_t versus time was found to give a straight line with a positive slope. What is the order of reaction?

Correct Answer
verified

Consider the following potential energy profile for the A → B reaction. How many intermediates are formed?

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

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

For the reaction 2A + B + 2C → D + E The following initial rate data were collected at constant temperature. What is the correct rate law for this reaction?

Correct Answer
verified

The rate law for the reaction 3A → 2B is rate = k[A] with a rate constant of 0.0447 h^-1. What is the half-life of the reaction?

Correct Answer
verified

The ________ is the name given to the sequence of steps that sum to give the overall reaction.

Correct Answer
verified

What is the rate expression for the production of X, which is a gas, at constant volume?

Correct Answer
verified

A first-order reaction has a rate constant of 3.00 × 10^-3s^-1. The time required for the reaction to be 75.0% complete is

Correct Answer
verified

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

Correct Answer
verified

It takes 42.0 min for the concentration of a reactant in a first-order reaction to drop from 0.45 M to 0.32 M at 25°C. How long will it take for the reaction to be 90% complete?

Correct Answer
verified

The reaction CH₃NC(g) → CH₃CN(g) is first order with respect to methyl isocyanide, CH₃NC. If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react, what is the rate constant in units of min^-1?

Correct Answer
verified

Consider the following potential energy profile for the A → B reaction. Assuming that the frequency factor for the reaction is 5.5 × 10¹⁰ s^-1, what is the rate constant of this first-order reaction at 310 K?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Exam 14: Chemical Kinetics

The units of the rate constant depend on the order of the reaction.

Correct AnswerverifiedShow Answer

According to the collision theory of reaction rates, what are the three requirements which must be met before an elementary reaction between two molecules can occur?

Correct AnswerverifiedMolecules must collide with ea...View AnswerShow Answer

The elementary reaction HBr(g) + Br(g) → H(g) + Br2 (g) is endothermic. Would you expect the rate constant for the back reaction to be smaller or larger than that for the forward reaction? Explain, briefly.

Correct AnswerverifiedThe back reaction is exothermic. Since t...View AnswerShow Answer

The activation energy for the following reaction is 60. kJ/mol. Sn2+ + 2Co3+ → Sn4+ + 2Co2+ By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Correct AnswerverifiedShow 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

For the chemical reaction A → C, a plot of 1/[A]t versus time was found to give a straight line with a positive slope. What is the order of reaction?

Correct AnswerverifiedShow Answer

Consider the following potential energy profile for the A → B reaction. How many intermediates are formed?

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 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

For the reaction 2A + B + 2C → D + E The following initial rate data were collected at constant temperature. What is the correct rate law for this reaction?

Correct AnswerverifiedShow Answer

The rate law for the reaction 3A → 2B is rate = k[A] with a rate constant of 0.0447 h-1. What is the half-life of the reaction?

Correct AnswerverifiedShow Answer

The ________ is the name given to the sequence of steps that sum to give the overall reaction.

Correct AnswerverifiedShow Answer

What is the rate expression for the production of X, which is a gas, at constant volume?

Correct AnswerverifiedShow Answer

A first-order reaction has a rate constant of 3.00 × 10-3 s-1. The time required for the reaction to be 75.0% complete is

Correct AnswerverifiedShow 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

It takes 42.0 min for the concentration of a reactant in a first-order reaction to drop from 0.45 M to 0.32 M at 25°C. How long will it take for the reaction to be 90% complete?

Correct AnswerverifiedShow Answer

The reaction CH3NC(g) → CH3CN(g) is first order with respect to methyl isocyanide, CH3NC. If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react, what is the rate constant in units of min-1?

Correct AnswerverifiedShow Answer

Consider the following potential energy profile for the A → B reaction. Assuming that the frequency factor for the reaction is 5.5 × 1010 s-1, what is the rate constant of this first-order reaction at 310 K?

Correct AnswerverifiedShow Answer

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+]. What is the order of the reaction with respect to I-?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
Molecules must collide with ea...
View Answer

The elementary reaction HBr(g) + Br(g) → H(g) + Br₂ (g) is endothermic. Would you expect the rate constant for the back reaction to be smaller or larger than that for the forward reaction? Explain, briefly.

Correct Answer
verified
The back reaction is exothermic. Since t...
View Answer

The activation energy for the following reaction is 60. kJ/mol. Sn²⁺ + 2Co³⁺→ Sn⁴⁺ + 2Co²⁺ By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Correct Answer
verified

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

For the chemical reaction A → C, a plot of 1/[A]_t versus time was found to give a straight line with a positive slope. What is the order of reaction?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The rate law for the reaction 3A → 2B is rate = k[A] with a rate constant of 0.0447 h^-1. What is the half-life of the reaction?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A first-order reaction has a rate constant of 3.00 × 10^-3s^-1. The time required for the reaction to be 75.0% complete is

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

The reaction CH₃NC(g) → CH₃CN(g) is first order with respect to methyl isocyanide, CH₃NC. If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react, what is the rate constant in units of min^-1?

Correct Answer
verified

Consider the following potential energy profile for the A → B reaction. Assuming that the frequency factor for the reaction is 5.5 × 10¹⁰ s^-1, what is the rate constant of this first-order reaction at 310 K?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified