Sulfur trioxide can undergo decomposition according to the equation 2SO3 → 2SO2 + O2 For this reaction, rate = −0.5Δ[SO3 ]/Δt = k[SO3]2. If the reaction rate is 1.75 × 10−7 mol L−1 min−1 when the concentration of sulfur trioxide is 5.4 × 10−3 mol L−1, what is the value of the rate constant k?

A) 3.2 × 10 −5 L mol −1 min −1 B) 1.6 × 10 −5 L mol −1 min −1 C) 6.0 × 10 −3 L mol −1 min −1 D) 3.0 × 10 −3 L mol −1 min −1 E) 1.6 × 10 −2 L mol −1 min −1 A) 3.2 × 10 −5 L mol −1 min −1 B) 1.6 × 10 −5 L mol −1 min −1 C) 6.0 × 10 −3 L mol −1 min −1 D) 3.0 × 10 −3 L mol −1 min −1 E) 1.6 × 10 −2 L mol −1 min −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?

A) Lowering the temperature B) Adding a catalyst C) Using a larger initial amount of CH 3NC in the same vessel D) Using a bigger vessel, but the same initial amount of CH 3NC E) Continuously removing CH 3CN as it is formed A) Lowering the temperature B) Adding a catalyst C) Using a larger initial amount of CH 3NC in the same vessel D) Using a bigger vessel, but the same initial amount of CH 3NC E) Continuously removing CH 3CN as it is formed

What is the molecularity of the following elementary reaction? NH2Cl(aq) + OH− (aq) → NHCl− (aq) + H2O(l)

A) Unimolecular B) Bimolecular C) Termolecular D) Tetramolecular E) Need to know the reaction order before molecularity can be determined. A) Unimolecular B) Bimolecular C) Termolecular D) Tetramolecular E) Need to know the reaction order before molecularity can be determined.

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?

A) 0.0457 M B) 0.105 M C) 0.127 M D) 0.492 M E) None of these choices are correct. A) 0.0457 M B) 0.105 M C) 0.127 M D) 0.492 M E) None of these choices are correct.

The rate law for the rearrangement of CH3NC to CH3CN at 800 K is Rate = (1300 s−1)[CH3NC]. What is the half-life for this reaction?

A) 7.69 × 10 −4 s B) 5.3 × 10 −4 s C) 1.9 × 10 −3 s D) 520 s E) 1920 s A) 7.69 × 10 −4 s B) 5.3 × 10 −4 s C) 1.9 × 10 −3 s D) 520 s E) 1920 s

Consider the general reaction 5Br−(aq) + BrO3−(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(aq) For this reaction, the rate when expressed as Δ[Br2]/Δt is the same as

A) −Δ[H 2O]/Δt B) 3Δ[BrO 3 −]/Δt C) −5Δ[Br −]/Δt D) −0.6Δ[Br −]/Δt E) None of these choices are correct. A) −Δ[H 2O]/Δt B) 3Δ[BrO 3 −]/Δt C) −5Δ[Br −]/Δt D) −0.6Δ[Br −]/Δt E) None of these choices are correct.

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 × 10−5s−1. What is the order of the reaction?

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

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 × 10 13 s −1 B) 6.7 × 10 −22 s −1 C) 1.5 × 10 11 s −1 D) 4.7 × 10 −3 s −1 E) None of these choices are correct. A) 2.1 × 10 13 s −1 B) 6.7 × 10 −22 s −1 C) 1.5 × 10 11 s −1 D) 4.7 × 10 −3 s −1 E) None of these choices are correct.

The decomposition of hydrogen peroxide is a first-order process with a rate constant of 1.06 × 10−3 min−1. How long will it take for the concentration of H2O2 to drop from 0.0200 M to 0.0120 M?

A) < 1 min B) 7.55 min C) 481 min D) 4550 min E) 31,400 min A) < 1 min B) 7.55 min C) 481 min D) 4550 min E) 31,400 min

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

For the reaction 3A(g) + 2B(g) → 2C(g) + 2D(g) The following data were collected at constant temperature. Determine the correct rate law for this reaction.

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(Multiple Choice)

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Question 1

Correct Answer:

Verified

A catalyst accelerates a reaction because

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(Multiple Choice)

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Question 2

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?

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(Multiple Choice)

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Question 3

Correct Answer:

Verified

Sulfur trioxide can undergo decomposition according to the equation 2SO₃ → 2SO₂ + O₂ For this reaction, rate = −0.5Δ[SO₃ ]/Δt = k[SO₃]². If the reaction rate is 1.75 × 10⁻⁷ mol L⁻¹ min⁻¹ when the concentration of sulfur trioxide is 5.4 × 10⁻³ mol L⁻¹, what is the value of the rate constant k?

(Multiple Choice)

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Question 4

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 5

Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water. From 164.5°C to 179.0°C, the rate constant increases by a factor of 4.27. What is the activation energy of this oxidation reaction?

(Multiple Choice)

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Question 6

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

(Multiple Choice)

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Question 7

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 8

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

(True/False)

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Question 9

What is the molecularity of the following elementary reaction? NH₂Cl(aq) + OH⁻ (aq) → NHCl⁻ (aq) + H₂O(l)

(Multiple Choice)

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Question 10

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 11

The rate law for the rearrangement of CH₃NC to CH₃CN at 800 K is Rate = (1300 s⁻¹)[CH₃NC]. What is the half-life for this reaction?

(Multiple Choice)

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Question 12

Consider the general reaction 5Br⁻(aq) + BrO₃⁻(aq) + 6H⁺(aq) → 3Br₂(aq) + 3H₂O(aq) For this reaction, the rate when expressed as Δ[Br₂]/Δt is the same as

(Multiple Choice)

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Question 13

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?

(Multiple Choice)

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Question 14

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 × 10⁻⁵s⁻¹. What is the order of the reaction?

(Multiple Choice)

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Question 15

A reaction is second-order with respect to the reactant R. Which of the following plots will produce a straight line?

(Multiple Choice)

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Question 16

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 17

When a catalyst is added to a reaction mixture, it

(Multiple Choice)

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Question 18

In a reversible reaction, a catalyst will speed up the forward reaction but not affect the reverse reaction.

(True/False)

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Question 19

The decomposition of hydrogen peroxide is a first-order process with a rate constant of 1.06 × 10⁻³ min⁻¹. How long will it take for the concentration of H₂O₂ to drop from 0.0200 M to 0.0120 M?

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Question 20

Showing 1 - 20 of 78

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

For the reaction 3A(g) + 2B(g) → 2C(g) + 2D(g) The following data were collected at constant temperature. Determine the correct rate law for this reaction.

A catalyst accelerates a reaction because

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 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?

Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water. From 164.5°C to 179.0°C, the rate constant increases by a factor of 4.27. What is the activation energy of this oxidation reaction?

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

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?

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

What is the molecularity of the following elementary reaction? NH2Cl(aq) + OH− (aq) → NHCl− (aq) + H2O(l)

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 rate law for the rearrangement of CH3NC to CH3CN at 800 K is Rate = (1300 s−1)[CH3NC]. What is the half-life for this reaction?

Consider the general reaction 5Br−(aq) + BrO3−(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(aq) For this reaction, the rate when expressed as Δ[Br2]/Δt is the same as

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?

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 × 10−5s−1. What is the order of the reaction?

A reaction is second-order with respect to the reactant R. Which of the following plots will produce a straight line?

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?

When a catalyst is added to a reaction mixture, it

In a reversible reaction, a catalyst will speed up the forward reaction but not affect the reverse reaction.

The decomposition of hydrogen peroxide is a first-order process with a rate constant of 1.06 × 10−3 min−1. How long will it take for the concentration of H2O2 to drop from 0.0200 M to 0.0120 M?

Keys to the Study of 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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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 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?

What is the molecularity of the following elementary reaction? NH₂Cl(aq) + OH⁻ (aq) → NHCl⁻ (aq) + H₂O(l)

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 rate law for the rearrangement of CH₃NC to CH₃CN at 800 K is Rate = (1300 s⁻¹)[CH₃NC]. What is the half-life for this reaction?

Consider the general reaction 5Br⁻(aq) + BrO₃⁻(aq) + 6H⁺(aq) → 3Br₂(aq) + 3H₂O(aq) For this reaction, the rate when expressed as Δ[Br₂]/Δt is the same as

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?

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 × 10⁻⁵s⁻¹. What is the order of the reaction?

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 decomposition of hydrogen peroxide is a first-order process with a rate constant of 1.06 × 10⁻³ min⁻¹. How long will it take for the concentration of H₂O₂ to drop from 0.0200 M to 0.0120 M?