Question 1

The isomerization of cyclopropane to propene follows first-order kinetics. -4 min-1. How many minutes are required for 10.0% of a sample of cyclopropane to isomerize to propene? A) 16,100 min B) 170 min C) 3,710 min D) 1.43 * 10-3 min E) 1,120 min" class="answers-bank-image d-inline" rel="preload" > At 700 K, the rate constant for this reaction is 6.2 * 10-4 min-1. How many minutes are required for 10.0% of a sample of cyclopropane to isomerize to propene?

Accepted Answer

A)  16,100 min
B)  170 min
C)  3,710 min
D)  1.43 * 10-3 min
E)  1,120 minF) A) and C)
G) All of the above

Question 2

The thermal decomposition of acetaldehyde, CH3CHO  →\rarr→  CH4 + CO, is a second-order reaction. The following data were obtained at 518°C. 3CHO  \rarr  CH4 + CO, is a second-order reaction. The following data were obtained at 518°C.   Based on the data given, what is the half-life for the disappearance of acetaldehyde? A) 1.5 * 105 s B) 410 s C) 5.4 * 107 s D) 520 s E) 305 s " class="answers-bank-image d-inline" rel="preload" > Based on the data given, what is the half-life for the disappearance of acetaldehyde?

Accepted Answer

A)  1.5 * 105 s
B)  410 s
C)  5.4 * 107 s
D)  520 s
E)  305 s F) B) and E)
G) None of the above

Question 3

A rate constant with the units L2 · mol-2 · s-1 is consistent with a

Accepted Answer

A)  zero-order reaction.
B)  first-order reaction.
C)  second-order reaction.
D)  third-order reaction.
E)  fourth-order reaction.F) A) and D)
G) C) and D)

Question 4

What is the slope of an Arrhenius plot for the following reaction? 2NOCl  →\rarr→  2NO + Cl2 2     A) 8.18 * 10-2 K B) 5.06 * 10-2 K C) -1.22 * 104 K D) -1.96 * 104 K E) not enough information to calculate the slope " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  8.18 * 10-2 K
B)  5.06 * 10-2 K
C)  -1.22 * 104 K
D)  -1.96 * 104 K
E)  not enough information to calculate the slope F) B) and C)
G) None of the above

Question 5

A rate constant will have the units mol · L-1 · s-1 when the reaction is overall

Accepted Answer

A)  zero order.
B)  first order.
C)  second order.
D)  third order.
E)  fourth order.F) D) and E)
G) B) and D)

Question 6

The reaction 2NO2(g)  →\rarr→ 2NO(g) + O2(g) is suspected to be second order in NO2. Which of the following kinetic plots would be the most useful to confirm whether or not the reaction is second order?

Accepted Answer

A)  a plot of [NO2]-1 vs. t
B)  a plot of ln [NO2] vs. t
C)  a plot of [NO2] vs. t
D)  a plot of ln [NO2]-1 vs. t
E)  a plot of [NO2]2 vs. t F) C) and E)
G) C) and D)

Question 7

Appropriate units for a first-order rate constant are

Accepted Answer

A)  M/s.
B)  1/M·s.
C)  1/s.
D)  1/M2·s.E) B) and C)
F) All of the above

Question 8

A nuclear stress test utilizes a gamma-emitting radioisotope such as thallium-201 to follow the flow of blood through the heart - first at rest, and then under stress. The first-order rate constant for the decay of thallium-201 is 9.5 x 10-3 hr-1. Calculate how long it takes for the amount of thallium-201 to fall to 5.0% of its original value.

Accepted Answer

Question 9

For the chemical reaction system described by the diagram below, which statement is true?

Accepted Answer

A)  The forward reaction is endothermic.
B)  The activation energy for the forward reaction is greater than the activation energy for the reverse reaction.
C)  At equilibrium, the activation energy for the forward reaction is equal to the activation energy for the reverse reaction.
D)  The activation energy for the reverse reaction is greater than the activation energy for the forward reaction.
E)  The reverse reaction is exothermic.F) D) and E)
G) C) and D)

Question 10

Aspirin, C9H8O4, slowly decomposes at room temperature by reacting with water in the atmosphere to produce acetic acid, HC2H3O2, and 2-hydroxybenzoic acid, C7H6O3 (this is why old bottles of aspirin often smell like vinegar):
C9H8O4 + H2O $\rarr$HC2H3O2 + C7H6O3
 
 Concentration and rate data for this reaction are given below.   Write the rate law for this reaction and calculate k (be sure to include the correct units).

Accepted Answer

The rate law is rate = k[C<sub...

Question 11

The Arrhenius equation is k = Ae-Ea/RT. The slope of a plot of ln k vs. 1/T is equal to

Accepted Answer

A)  -k.
B)  k.
C)  Ea.
D)  -Ea /R.
E)  A.F) All of the above
G) A) and E)

Question 12

The rate constant for the first-order decomposition of C4H8 at 500°C is 9.2 * 10-3 s-1. How long will it take for 10.0% of a 0.100 M sample of C4H8 to decompose at 500°C?

Accepted Answer

The answer of The rate constant for the first-order decomposition...

Question 13

A first-order reaction has a rate constant of 7.5 * 10-3 /s. 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 s.F) A) and B)
G) B) and E)

Question 14

The graphs below all refer to the same reaction. What is the order of this reaction?

Accepted Answer

A)  zeroth order
B)  first order
C)  second order
D)  unable to predictE) A) and B)
F) B) and C)

Question 15

For the following reaction,  Δ\DeltaΔ P(C6H14) / Δ\DeltaΔ t was found to be -6.2 * 10-3 atm/s. C6H14(g)  →\rarr→  C6H6(g) + 4H2(g) 
Determine  Δ\DeltaΔ P(H2) / Δ\DeltaΔ t for this reaction at the same time.

Accepted Answer

A)  6.2 * 10-3 atm/s
B)  1.6 * 10-3 atm/s
C)  2.5 * 10-2 atm/s
D)  -1.6 * 10-3 atm/s
E)  -2.5 * 10-2 atm/s F) C) and E)
G) None of the above

Question 16

For the chemical reaction system described by the diagram below, which statement is true? a for the forward reaction is 25 kJ/mol and the enthalpy of reaction is -95 kJ/mol, what is Ea for the reverse reaction? A) 120 kJ/mol B) 70 kJ/mol C) 95 kJ/mol D) 25 kJ/mol E) -70 kJ/mol" class="answers-bank-image d-inline" rel="preload" > If the Ea for the forward reaction is 25 kJ/mol and the enthalpy of reaction is -95 kJ/mol, what is Ea for the reverse reaction?

Accepted Answer

A)  120 kJ/mol
B)  70 kJ/mol
C)  95 kJ/mol
D)  25 kJ/mol
E)  -70 kJ/molF) A) and E)
G) C) and E)

Question 17

At a certain temperature, the data below were collected for the reaction below.
2ICl + H2 $\rarr$I2 + 2HCl.
Determine the rate constant for the reaction.

Accepted Answer

1.5 * 10<s...

Question 18

When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases,

Accepted Answer

A)  the average kinetic energy of molecules increases.
B)  the frequency of molecular collisions increases.
C)  the rate constant increases.
D)  the activation energy increases.
E)  the order of reaction increases.F) B) and C)
G) C) and E)

Question 19

Sucrose, C12H22O11, reacts slowly with water in the presence of an acid to form two other sugars, glucose and fructose, both of which have the same molecular formulas, but different structures.
C12H22O11 + H2O $\rarr$ C6H12O6 (glucose)+ C6H12O6 (fructose)
The reaction is first order and has a rate constant of 6.2 * 10-5 /s at 35°C when the H+ concentration is 0.10 M. Suppose that the initial concentration of sucrose in the solution is 0.40 M. How many minutes will it take for the sucrose concentration to drop to 0.30 M?

Accepted Answer

The answer of Sucrose, C12H22O11, reacts slowly with water in...

Question 20

In the reaction, 2N2O $\rarr$ 2N2 + O2, oxygen and nitrogen gases are formed at the same rate (mol/L·s).

Accepted Answer

A) True 
 B)False

Exam 14: Chemical Kinetics

For the chemical reaction system described by the diagram below, which statement is true?

Correct Answer
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The isomerization of cyclopropane to propene follows first-order kinetics. At 700 K, the rate constant for this reaction is 6.2 * 10^-4min^-1. How many minutes are required for 10.0% of a sample of cyclopropane to isomerize to propene?

Correct Answer
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A first-order reaction has a rate constant of 7.5 * 10^-3/s. The time required for the reaction to be 60% complete is

Correct Answer
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Correct Answer
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1.5 * 10
View Answer

In the reaction, 2N₂O $\rarr$ 2N₂ + O₂, oxygen and nitrogen gases are formed at the same rate (mol/L·s).

Correct Answer
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The Arrhenius equation is k = Ae^-Ea/RT. The slope of a plot of ln k vs. 1/T is equal to

Correct Answer
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Correct Answer
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When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases,

Correct Answer
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A rate constant will have the units mol · L^-1 · s^-1 when the reaction is overall

Correct Answer
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The graphs below all refer to the same reaction. What is the order of this reaction?

Correct Answer
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For the following reaction, $\Delta$ P(C₆H₁₄) / $\Delta$ t was found to be -6.2 * 10^-3 atm/s. C₆H₁₄(g) $\rarr$ C₆H₆(g) + 4H₂(g) Determine $\Delta$ P(H₂) / $\Delta$ t for this reaction at the same time.

Correct Answer
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The rate constant for the first-order decomposition of C₄H₈ at 500°C is 9.2 * 10^-3 s^-1. How long will it take for 10.0% of a 0.100 M sample of C₄H₈ to decompose at 500°C?

Correct Answer
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The reaction 2NO₂(g) $\rarr$ 2NO(g) + O₂(g) is suspected to be second order in NO₂. Which of the following kinetic plots would be the most useful to confirm whether or not the reaction is second order?

Correct Answer
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Correct Answer
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A rate constant with the units L² · mol^-2 · s^-1 is consistent with a

Correct Answer
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Appropriate units for a first-order rate constant are

Correct Answer
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Correct Answer
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Correct Answer
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The rate law is rate = k[C
View Answer

Correct Answer
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For the chemical reaction system described by the diagram below, which statement is true? If the E_a for the forward reaction is 25 kJ/mol and the enthalpy of reaction is -95 kJ/mol, what is E_a for the reverse reaction?

Correct Answer
verified

Exam 14: Chemical Kinetics

For the chemical reaction system described by the diagram below, which statement is true?

Correct AnswerverifiedShow Answer

The isomerization of cyclopropane to propene follows first-order kinetics. At 700 K, the rate constant for this reaction is 6.2 * 10-4 min-1. How many minutes are required for 10.0% of a sample of cyclopropane to isomerize to propene?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

At a certain temperature, the data below were collected for the reaction below. 2ICl + H2 →\rarr→ I2 + 2HCl. Determine the rate constant for the reaction.

Correct Answerverified1.5 * 10View AnswerShow Answer

In the reaction, 2N2O →\rarr→ 2N2 + O2, oxygen and nitrogen gases are formed at the same rate (mol/L·s).

Correct AnswerverifiedShow Answer

The Arrhenius equation is k = Ae-Ea/RT. The slope of a plot of ln k vs. 1/T is equal to

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases,

Correct AnswerverifiedShow Answer

A rate constant will have the units mol · L-1 · s-1 when the reaction is overall

Correct AnswerverifiedShow Answer

The graphs below all refer to the same reaction. What is the order of this reaction?

Correct AnswerverifiedShow Answer

For the following reaction, Δ\DeltaΔ P(C6H14) / Δ\DeltaΔ t was found to be -6.2 * 10-3 atm/s. C6H14(g) →\rarr→ C6H6(g) + 4H2(g) Determine Δ\DeltaΔ P(H2) / Δ\DeltaΔ t for this reaction at the same time.

Correct AnswerverifiedShow Answer

The rate constant for the first-order decomposition of C4H8 at 500°C is 9.2 * 10-3 s-1. How long will it take for 10.0% of a 0.100 M sample of C4H8 to decompose at 500°C?

Correct AnswerverifiedShow Answer

The reaction 2NO2(g) →\rarr→ 2NO(g) + O2(g) is suspected to be second order in NO2. Which of the following kinetic plots would be the most useful to confirm whether or not the reaction is second order?

Correct AnswerverifiedShow Answer

What is the slope of an Arrhenius plot for the following reaction? 2NOCl →\rarr→ 2NO + Cl2

Correct AnswerverifiedShow Answer

A rate constant with the units L2 · mol-2 · s-1 is consistent with a

Correct AnswerverifiedShow Answer

Appropriate units for a first-order rate constant are

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedThe rate law is rate = k[CView AnswerShow Answer

The thermal decomposition of acetaldehyde, CH3CHO →\rarr→ CH4 + CO, is a second-order reaction. The following data were obtained at 518°C. Based on the data given, what is the half-life for the disappearance of acetaldehyde?

Correct AnswerverifiedShow Answer

For the chemical reaction system described by the diagram below, which statement is true? If the Ea for the forward reaction is 25 kJ/mol and the enthalpy of reaction is -95 kJ/mol, what is Ea for the reverse reaction?

Correct AnswerverifiedShow Answer

Correct Answer
verified

The isomerization of cyclopropane to propene follows first-order kinetics. At 700 K, the rate constant for this reaction is 6.2 * 10^-4min^-1. How many minutes are required for 10.0% of a sample of cyclopropane to isomerize to propene?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified
1.5 * 10
View Answer

In the reaction, 2N₂O $\rarr$ 2N₂ + O₂, oxygen and nitrogen gases are formed at the same rate (mol/L·s).

Correct Answer
verified

The Arrhenius equation is k = Ae^-Ea/RT. The slope of a plot of ln k vs. 1/T is equal to

Correct Answer
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Correct Answer
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Correct Answer
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A rate constant will have the units mol · L^-1 · s^-1 when the reaction is overall

Correct Answer
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Correct Answer
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For the following reaction, $\Delta$ P(C₆H₁₄) / $\Delta$ t was found to be -6.2 * 10^-3 atm/s. C₆H₁₄(g) $\rarr$ C₆H₆(g) + 4H₂(g) Determine $\Delta$ P(H₂) / $\Delta$ t for this reaction at the same time.

Correct Answer
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The rate constant for the first-order decomposition of C₄H₈ at 500°C is 9.2 * 10^-3 s^-1. How long will it take for 10.0% of a 0.100 M sample of C₄H₈ to decompose at 500°C?

Correct Answer
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The reaction 2NO₂(g) $\rarr$ 2NO(g) + O₂(g) is suspected to be second order in NO₂. Which of the following kinetic plots would be the most useful to confirm whether or not the reaction is second order?

Correct Answer
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Correct Answer
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A rate constant with the units L² · mol^-2 · s^-1 is consistent with a

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The rate law is rate = k[C
View Answer

Correct Answer
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For the chemical reaction system described by the diagram below, which statement is true? If the E_a for the forward reaction is 25 kJ/mol and the enthalpy of reaction is -95 kJ/mol, what is E_a for the reverse reaction?

Correct Answer
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