Sulfur trioxide can undergo decomposition according to the equation 2SO3 F1F1F1S1F1F1F10 2SO2 + O2 For this reaction, rate = -0 0.5F1F1F1S1F1F1F10[SO3]/F1F1F1S1F1F1F10t = 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

Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+ + H2O2 H2O+-OH (rapid equilibrium) H2O+-OH + Br- F1F1F1S1F1F1F10 HOBr + H2O (slow) HOBr + H+ + Br- F1F1F1S1F1F1F10 Br2 + H2O (fast) Which of the following rate laws is consistent with the mechanism?

A) Rate = k[H2O2][H+]2[Br-] B) Rate = k [H2O+-OH][Br-] C) Rate = k[H2O2][H+][Br-] D) Rate = k[HOBr][H+][Br-][H2O2] E) Rate = k[Br-] A) Rate = k[H2O2][H+]2[Br-] B) Rate = k [H2O+-OH][Br-] C) Rate = k[H2O2][H+][Br-] D) Rate = k[HOBr][H+][Br-][H2O2] E) Rate = k[Br-]

Consider the reaction 2NH3(g) F1F1F1S1F1F1F10 N2(g) + 3H2(g) If the rate F1F1F1S1F1F1F10[H2]/F1F1F1S1F1F1F10t is 0.030 mol L-1 s-1, then F1F1F1S1F1F1F10[NH3]/F1F1F1S1F1F1F10t 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 the above 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 the above

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The gas-phase conversion of 1,3-butadiene to 1,5-cyclooctadiene, 2C₄H₆  C₈H₁₂ was studied, providing data for the plot shown, 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.

(Essay)

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Question 41

A boiled egg can be cooked at 100.0 °C in exactly 5 minutes. At an altitude of around 2000 m where the boiling point of water is 93.0 °C, it takes exactly 7.5 minutes to cook the egg to the same amount. What is the activation energy for the reaction involved when an egg is boiled?

(Multiple Choice)

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Question 42

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 43

If the activation energy of a reaction decreases by 10.0 kJ/mol, from 100.0 to 90.0 kJ/mol, what effect will this have on the rate of reaction at 298K?

(Multiple Choice)

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Question 44

The decomposition of SOCl₂is first-order in SOCl₂. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl₂to drop from 0.36 M to 0.045 M?

(Multiple Choice)

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Question 45

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 46

Sulfur trioxide can undergo decomposition according to the equation 2SO₃  2SO₂ + O₂ For this reaction, rate = -0 0.5[SO₃]/t = 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 47

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 48

Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H⁺ + H₂O₂ H₂O⁺-OH (rapid equilibrium) H₂O⁺-OH + Br^-  HOBr + H₂O (slow) HOBr + H⁺ + Br^-  Br₂ + H₂O (fast) Which of the following rate laws is consistent with the mechanism?

(Multiple Choice)

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Question 49

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

(Multiple Choice)

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Question 50

A catalyst lowers the activation energy but does not affect the mechanism of a reaction.

(True/False)

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Question 51

The decomposition of dinitrogen pentaoxide to nitrogen dioxide and oxygen follows first-order kinetics and has an activation energy of 102 kJ/mol. By what factor will the fraction of collisions with energy greater than or equal to the activation energy increase if the reaction temperature goes from 30°C to 60°C?

(Multiple Choice)

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Question 52

All second-order reactions are bimolecular reactions.

(True/False)

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Question 53

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?

(Essay)

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Question 54

When a catalyst is added to a reaction mixture, it

(Multiple Choice)

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Question 55

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 56

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 57

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

(Multiple Choice)

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Question 58

In an exothermic reaction,

(Multiple Choice)

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Question 59

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 60

Showing 41 - 60 of 88

A boiled egg can be cooked at 100.0 °C in exactly 5 minutes. At an altitude of around 2000 m where the boiling point of water is 93.0 °C, it takes exactly 7.5 minutes to cook the egg to the same amount. What is the activation energy for the reaction involved when an egg is boiled?

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

If the activation energy of a reaction decreases by 10.0 kJ/mol, from 100.0 to 90.0 kJ/mol, what effect will this have on the rate of reaction at 298K?

The decomposition of SOCl₂is first-order in SOCl₂. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl₂to drop from 0.36 M to 0.045 M?

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?

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

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

A catalyst lowers the activation energy but does not affect the mechanism of a reaction.

All second-order reactions are bimolecular reactions.

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?

When a catalyst is added to a reaction mixture, it

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 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

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

In an exothermic reaction,

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?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The 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: Bonding, Structure, and Reactivity

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 Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

A boiled egg can be cooked at 100.0 °C in exactly 5 minutes. At an altitude of around 2000 m where the boiling point of water is 93.0 °C, it takes exactly 7.5 minutes to cook the egg to the same amount. What is the activation energy for the reaction involved when an egg is boiled?

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

If the activation energy of a reaction decreases by 10.0 kJ/mol, from 100.0 to 90.0 kJ/mol, what effect will this have on the rate of reaction at 298K?

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?

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?

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

Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+ + H2O2 H2O+-OH (rapid equilibrium) H2O+-OH + Br-  HOBr + H2O (slow) HOBr + H+ + Br-  Br2 + H2O (fast) Which of the following rate laws is consistent with the mechanism?

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

A catalyst lowers the activation energy but does not affect the mechanism of a reaction.

All second-order reactions are bimolecular reactions.

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?

When a catalyst is added to a reaction mixture, it

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 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

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

In an exothermic reaction,

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?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The 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: Bonding, Structure, and Reactivity

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 Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

The decomposition of SOCl₂is first-order in SOCl₂. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl₂to drop from 0.36 M to 0.045 M?

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?

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

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?