A first-order reaction has a half-life of 20.0 minutes.Starting with 1.00 $\times$ 1020 molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

A) 1.00 $\times$ 104 molecules B) 2.00 $\times$ 1019 molecules C) 3.20 $\times$ 1016 molecules D) 5.00 $\times$ 1020 molecules E) None of these choices is correct. A) 1.00 $\times$ 104 molecules B) 2.00 $\times$ 1019 molecules C) 3.20 $\times$ 1016 molecules D) 5.00 $\times$ 1020 molecules E) None of these choices is correct.

Consider the reaction 2NH3(g) $\to$ N2(g)+ 3H2(g) If the rate $\Delta$[H2]/$\Delta$t is 0.030 mol L-1 s-1,then $\Delta$[NH3]/$\Delta$t is

A) -0.045 mol L-1 s-1 B) -0.030 mol L-1 s-1 C) -0.020 mol L-1 s-1 D) -0.010 mol L-1 s-1 E) None of these choices is correct. A) -0.045 mol L-1 s-1 B) -0.030 mol L-1 s-1 C) -0.020 mol L-1 s-1 D) -0.010 mol L-1 s-1 E) None of these choices is correct.

A study of the decomposition reaction 3RS2 $\to$ 3R + 6S yields the following initial rate data What is the rate constant for the reaction?

A) 0.0103 L mol-1s-1 B) 0.263 L mol-1s-1 C) 0.571 L mol-1s-1 D) 1.17 L mol-1s-1 E) 1.75 L mol-1s-1 A) 0.0103 L mol-1s-1 B) 0.263 L mol-1s-1 C) 0.571 L mol-1s-1 D) 1.17 L mol-1s-1 E) 1.75 L mol-1s-1

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]

The rate law for the reaction 3A $\to$ C is Rate = 4.36 $\times$ 10-2 L mol-1 hr-1[A]2 What is the half-life for the reaction if the initial concentration of A is 0.250 M?

A) 0.0109 hr B) 0.0629 hr C) 15.9 hr D) 23.9 hr E) 91.7 hr A) 0.0109 hr B) 0.0629 hr C) 15.9 hr D) 23.9 hr E) 91.7 hr

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

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 41

The rate law cannot be predicted from the stoichiometry of a reaction.

(True/False)

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Question 42

In the gas phase at 500.°C,cyclopropane reacts to form propene in a first-order reaction.The figure below shows the concentration of cyclopropane plotted versus time.Use the graph to calculate approximate values of a.the rate of the reaction,600.seconds after the start. b.the half-life of the reaction,t_1/2.

(Essay)

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Question 43

For the reaction 2A + B + 2C $\to$ D + E The following initial rate data was collected at constant temperature.Determine the correct rate law for this reaction.All units are arbitrary. $For the reaction 2A + B + 2C \to D + E The following initial rate data was collected at constant temperature.Determine the correct rate law for this reaction.All units are arbitrary.$

(Multiple Choice)

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Question 44

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

(Multiple Choice)

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Question 45

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

(True/False)

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Question 46

The elementary reaction HBr(g)+ Br(g) $\to$ H(g)+ Br₂(g)is endothermic. a.Would you expect the rate constant for the back reaction to be smaller or larger than that for the forward reaction? Explain,briefly. b.Draw a fully-labeled reaction energy diagram for this reaction,showing the locations of the reactants,products and transition state.

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Question 47

A first-order reaction has a half-life of 20.0 minutes.Starting with 1.00 $\times$ 10²⁰ molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

(Multiple Choice)

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Question 48

The half-life of a first-order reaction does not depend on the initial concentration of reactant.

(True/False)

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Question 49

The gas-phase conversion of 1,3-butadiene to 1,5-cyclooctadiene,2C₄H₆ $\to$ C₈H₁₂ was studied,providing data for the plot shown below,of 1/[butadiene] versus time. a.Explain how this plot confirms that the reaction is second order. b.Calculate the second-order rate constant,k. c.Determine the initial concentration of 1,3-butadiene in this experiment. $The gas-phase conversion of 1,3-butadiene to 1,5-cyclooctadiene,2C4H6 \to C8H12 was studied,providing data for the plot shown below,of 1/[butadiene] versus time. a.Explain how this plot confirms that the reaction is second order. b.Calculate the second-order rate constant,k. c.Determine the initial concentration of 1,3-butadiene in this experiment.$

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Question 50

When the reaction A $\to$ 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 51

Consider the reaction 2NH₃(g) $\to$ N₂(g)+ 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L^-1 s^-1,then $\Delta$ [NH₃]/ $\Delta$ t is

(Multiple Choice)

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Question 52

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

(Multiple Choice)

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Question 53

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

(True/False)

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Question 54

A study of the decomposition reaction 3RS₂ $\to$ 3R + 6S yields the following initial rate data $A study of the decomposition reaction 3RS2 \to 3R + 6S yields the following initial rate data What is the rate constant for the reaction?$ What is the rate constant for the reaction?

(Multiple Choice)

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Question 55

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 56

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

(True/False)

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Question 57

In the gas phase at 500.°C,cyclopropane reacts to form propene in a first-order reaction.The figure shows the natural logarithm of the concentration of cyclopropane (in mol/L)plotted versus time. a.Explain how this plot confirms that the reaction is first order. b.Calculate the first-order rate constant,k. c.Determine the initial concentration of cyclopropane in this experiment.

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Question 58

The greater the energy of activation,E_a,the faster will be the reaction.

(True/False)

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Question 59

The rate law for the reaction 3A $\to$ C is Rate = 4.36 $\times$ 10^-2 L mol^-1 hr^-1[A]² What is the half-life for the reaction if the initial concentration of A is 0.250 M?

(Multiple Choice)

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Question 60

Showing 41 - 60 of 76

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?

The rate law cannot be predicted from the stoichiometry of a reaction.

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

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

A first-order reaction has a half-life of 20.0 minutes.Starting with 1.00 $\times$ 10²⁰ molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

The half-life of a first-order reaction does not depend on the initial concentration of reactant.

When the reaction A $\to$ 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?

Consider the reaction 2NH₃(g) $\to$ N₂(g)+ 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L^-1 s^-1,then $\Delta$ [NH₃]/ $\Delta$ t is

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

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

A study of the decomposition reaction 3RS₂ $\to$ 3R + 6S yields the following initial rate data $A study of the decomposition reaction 3RS<sub>2</sub> \to 3R + 6S yields the following initial rate data What is the rate constant for the reaction?$ What is the rate constant for the reaction?

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.

The greater the energy of activation,E_a,the faster will be the reaction.

The rate law for the reaction 3A $\to$ C is Rate = 4.36 $\times$ 10^-2 L mol^-1 hr^-1[A]² What is the half-life for the reaction if the initial concentration of A is 0.250 M?

Keys to the Study of Chemistry

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 Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

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 the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

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?

The rate law cannot be predicted from the stoichiometry of a reaction.

For the reaction 2A + B + 2C →\to→ D + E The following initial rate data was collected at constant temperature.Determine the correct rate law for this reaction.All units are arbitrary.

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

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

A first-order reaction has a half-life of 20.0 minutes.Starting with 1.00 ×\times× 1020 molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

The half-life of a first-order reaction does not depend on the initial concentration of reactant.

When the reaction A →\to→ 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?

Consider the reaction 2NH3(g) →\to→ N2(g)+ 3H2(g) If the rate Δ\DeltaΔ [H2]/ Δ\DeltaΔ t is 0.030 mol L-1 s-1,then Δ\DeltaΔ [NH3]/ Δ\DeltaΔ t is

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

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

A study of the decomposition reaction 3RS2 →\to→ 3R + 6S yields the following initial rate data What is the rate constant for the reaction?

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.

The greater the energy of activation,Ea,the faster will be the reaction.

The rate law for the reaction 3A →\to→ C is Rate = 4.36 ×\times× 10-2 L mol-1 hr-1[A]2 What is the half-life for the reaction if the initial concentration of A is 0.250 M?

Keys to the Study of Chemistry

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 Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

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 the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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 first-order reaction has a half-life of 20.0 minutes.Starting with 1.00 $\times$ 10²⁰ molecules of reactant at time t = 0,how many molecules remain unreacted after 100.0 minutes?

When the reaction A $\to$ 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?

Consider the reaction 2NH₃(g) $\to$ N₂(g)+ 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L^-1 s^-1,then $\Delta$ [NH₃]/ $\Delta$ t is

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

A study of the decomposition reaction 3RS₂ $\to$ 3R + 6S yields the following initial rate data $A study of the decomposition reaction 3RS<sub>2</sub> \to 3R + 6S yields the following initial rate data What is the rate constant for the reaction?$ What is the rate constant for the reaction?

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 greater the energy of activation,E_a,the faster will be the reaction.

The rate law for the reaction 3A $\to$ C is Rate = 4.36 $\times$ 10^-2 L mol^-1 hr^-1[A]² What is the half-life for the reaction if the initial concentration of A is 0.250 M?