Tetrafluoroethylene, C2F4, can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant. A plot of 1/[C2F4] vs. time gives a straight line with a slope of 0.0448 L mol-1s-1. What is the rate law for this reaction?

A) Rate = 0.0448 (L mol-1s-1)[C2F4] B) Rate = 22.3 (mol L-1s)[C2F4] C) Rate = 0.0448 (L mol-1s-1)[C2F4]2 D) Rate = 22.3 (mol L-1s)[C2F4]2 E) Rate = 0.0448 s-1 [C2F4] A) Rate = 0.0448 (L mol-1s-1)[C2F4] B) Rate = 22.3 (mol L-1s)[C2F4] C) Rate = 0.0448 (L mol-1s-1)[C2F4]2 D) Rate = 22.3 (mol L-1s)[C2F4]2 E) Rate = 0.0448 s-1 [C2F4]

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, in s-1?

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) None of these choices are correct. 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) None of these choices are correct.

The gas-phase reaction CH3NC → CH3CN has been studied in a closed vessel, and the rate equation was found to be: Rate = -Δ[CH3NC]/Δt = k[CH3NC]. Which one of the following actions is least likely to cause a change in the rate of the reaction?

A) lowering the temperature B) adding a catalyst C) using a larger initial amount of CH3NC in the same vessel D) using a bigger vessel, but the same initial amount of CH3NC E) continuously removing CH3CN as it is formed A) lowering the temperature B) adding a catalyst C) using a larger initial amount of CH3NC in the same vessel D) using a bigger vessel, but the same initial amount of CH3NC E) continuously removing CH3CN as it is formed

Exam 16: Kinetics Rates and Mechanisms of Chemical Reactions

Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10^-2 hr^-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

(Multiple Choice)

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Question 21

The kinetics of the decomposition of dinitrogen pentaoxide is studied at 50°C and at 75°C. Which of the following statements concerning the studies is correct?

(Multiple Choice)

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Question 22

Tetrafluoroethylene, C₂F₄, can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant. A plot of 1/[C₂F₄] vs. time gives a straight line with a slope of 0.0448 L mol^-1s^-1. What is the rate law for this reaction?

(Multiple Choice)

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Question 23

An elementary reaction is a simple, one-step process.

(True/False)

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Question 24

A reaction intermediate is a species corresponding to a local energy maximum on a reaction energy diagram.

(True/False)

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Question 25

Which of the following sets of units could be appropriate for a zero-order rate constant?

(Multiple Choice)

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Question 26

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 at which RX₃ is disappearing over the entire experiment? T(s) [RX₃](mol L^-1) 0 0.85 2 0.67 6 0.41 8 0.33 12 0.20 14 0.16

(Multiple Choice)

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Question 27

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year^-1. What fraction of the tritium initially in a sample is still present 30 years later?

(Multiple Choice)

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Question 28

The reaction X → Y is first-order overall and first-order with respect to the reactant X. The result of doubling the initial concentration of X will be to

(Multiple Choice)

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Question 29

When the reaction A → B + C is studied, a plot 1/[A]_t vs. time gives a straight line with a positive slope. What is the order of the reaction?

(Multiple Choice)

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Question 30

Which one of the following sets of units is appropriate for a third-order rate constant?

(Multiple Choice)

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Question 31

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 ?

(Multiple Choice)

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Question 32

The decomposition of SOCl₂ is first-order in SOCl₂. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl₂ to drop from 0.36 M to 0.045 M?

(Multiple Choice)

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Question 33

For the reaction 2A + B + 2C → D + E The following initial rate data were collected at constant temperature. Determine the correct rate law for this reaction. All units are arbitrary. Trial [A] [B] [C] Rate 1 0)225 0.150 0.350 0.0217 2 0)320 0.150 0.350 0.0439 3 0)225 0.250 0.350 0.0362 4 0)225 0.150 0.600 0.01270

(Multiple Choice)

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Question 34

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, in s^-1?

(Multiple Choice)

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Question 35

The gas-phase reaction CH₃NC → CH₃CN has been studied in a closed vessel, and the rate equation was found to be: Rate = -Δ[CH₃NC]/Δt = k[CH₃NC]. Which one of the following actions is least likely to cause a change in the rate of the reaction?

(Multiple Choice)

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Question 36

When a catalyst is added to a reaction mixture, it

(Multiple Choice)

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Question 37

Which one of the following sets of units is appropriate for a second-order rate constant?

(Multiple Choice)

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Question 38

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

(True/False)

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Question 39

Which of the following affects the activation energy of a reaction?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 78

Exam 16: Kinetics Rates and Mechanisms of Chemical Reactions

Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10-2 hr-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

The kinetics of the decomposition of dinitrogen pentaoxide is studied at 50°C and at 75°C. Which of the following statements concerning the studies is correct?

Tetrafluoroethylene, C2F4, can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant. A plot of 1/[C2F4] vs. time gives a straight line with a slope of 0.0448 L mol-1s-1. What is the rate law for this reaction?

An elementary reaction is a simple, one-step process.

A reaction intermediate is a species corresponding to a local energy maximum on a reaction energy diagram.

Which of the following sets of units could be appropriate for a zero-order rate constant?

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year-1. What fraction of the tritium initially in a sample is still present 30 years later?

The reaction X → Y is first-order overall and first-order with respect to the reactant X. The result of doubling the initial concentration of X will be to

When the reaction A → B + C is studied, a plot 1/[A]t vs. time gives a straight line with a positive slope. What is the order of the reaction?

Which one of the following sets of units is appropriate for a third-order rate constant?

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 ?

The decomposition of SOCl2 is first-order in SOCl2. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl2 to drop from 0.36 M to 0.045 M?

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, in s-1?

The gas-phase reaction CH3NC → CH3CN has been studied in a closed vessel, and the rate equation was found to be: Rate = -Δ[CH3NC]/Δt = k[CH3NC]. Which one of the following actions is least likely to cause a change in the rate of the reaction?

When a catalyst is added to a reaction mixture, it

Which one of the following sets of units is appropriate for a second-order rate constant?

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

Which of the following affects the activation energy of a reaction?

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10^-2 hr^-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

Tetrafluoroethylene, C₂F₄, can be converted to octafluorocyclobutane which can be used as a refrigerant or an aerosol propellant. A plot of 1/[C₂F₄] vs. time gives a straight line with a slope of 0.0448 L mol^-1s^-1. What is the rate law for this reaction?

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year^-1. What fraction of the tritium initially in a sample is still present 30 years later?

When the reaction A → B + C is studied, a plot 1/[A]_t vs. time gives a straight line with a positive slope. What is the order of the reaction?

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 ?

The decomposition of SOCl₂ is first-order in SOCl₂. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl₂ to drop from 0.36 M to 0.045 M?

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, in s^-1?

The gas-phase reaction CH₃NC → CH₃CN has been studied in a closed vessel, and the rate equation was found to be: Rate = -Δ[CH₃NC]/Δt = k[CH₃NC]. Which one of the following actions is least likely to cause a change in the rate of the reaction?