The activation energy for the reaction O + O3 F1F1F1S1F1F1F10 2O2 is 25 kJ/mol, and the enthalpy change is F1F1F1S1F1F1F10H = -388 kJ/mol. What is the activation energy for the decomposition of O2 by the reverse reaction?

A) 413 kJ B) 388 kJ C) 363 kJ D) 50 kJ E) 25 kJ A) 413 kJ B) 388 kJ C) 363 kJ D) 50 kJ E) 25 kJ

The isomerization of cyclopropane to propene follows first-order kinetics. At 700 K, the rate constant for this reaction is 6.2 F1F1F1S1F1F1F10 10-4 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 F1F1F1S1F1F1F10 10-3 min E) 1,120 min A) 16,100 min B) 170 min C) 3,710 min D) 1.43 F1F1F1S1F1F1F10 10-3 min E) 1,120 min

A certain first-order reaction A F1F1F1S1F1F1F10 B is 25% complete in 42 min at 25°C. What is its rate constant?

A) 6.8 F1F1F1S1F1F1F10 10-3 min-1 B) 8.3 F1F1F1S1F1F1F10 10-3 min-1 C) 3.3 F1F1F1S1F1F1F10 10-2 min-1 D) -3.3 F1F1F1S1F1F1F10 10-2 min-1 E) 11 min-1 A) 6.8 F1F1F1S1F1F1F10 10-3 min-1 B) 8.3 F1F1F1S1F1F1F10 10-3 min-1 C) 3.3 F1F1F1S1F1F1F10 10-2 min-1 D) -3.3 F1F1F1S1F1F1F10 10-2 min-1 E) 11 min-1

At 700 K, the rate constant for the following reaction is 6.2 F1F1F1S1F1F1F10 10-4 min-1. How many minutes are required for 20% of a sample of cyclopropane to isomerize to propene?

A) 1,120 min B) 360 min C) 3710 min D) 1.4 F1F1F1S1F1F1F10 10-4 min E) 280 min A) 1,120 min B) 360 min C) 3710 min D) 1.4 F1F1F1S1F1F1F10 10-4 min E) 280 min

Exam 13: Chemical Kinetics

Nitric oxide gas (NO)reacts with chlorine gas according to the chemical equation given below. NO + Cl₂  NOCl The following initial rates of reaction have been measured for the given reagent concentrations. Which of the following is the rate law (rate equation)for this reaction?

(Multiple Choice)

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Question 41

Hydrogen peroxide decomposes to water and oxygen gas, and the activation energy for this process is 42 kJ/mol.The hydrogen peroxide formed in biological processes is harmful to tissue, but the enzyme catalase catalyzes the decomposition hydrogen peroxide by lowering the activation energy to 7.0 kJ/mol.Assuming the frequency factor is the same for both processes and independent of temperature, calculate the temperature required for the uncatalyzed decomposition to proceed at the same rate as the enzyme-catalyzed decomposition at 37°C (normal human body temperature).Is this a reasonable temperature for a biological organism?

(Short Answer)

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Question 42

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  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).

(Essay)

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Question 43

Which of the following statements is false?

(Multiple Choice)

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Question 44

The activation energy for the reaction O + O₃  2O₂ is 25 kJ/mol, and the enthalpy change is H = -388 kJ/mol. What is the activation energy for the decomposition of O₂ by the reverse reaction?

(Multiple Choice)

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Question 45

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  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. What will the sucrose concentration be after 2.0 hours?

(Short Answer)

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Question 46

For the chemical reaction A  C, a plot of 1/[A]_t versus time was found to give a straight line with a positive slope. What is the order of reaction?

(Multiple Choice)

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Question 47

Which one of the following units would not be an acceptable way to express reaction rate?

(Multiple Choice)

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Question 48

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

(Multiple Choice)

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Question 49

The thermal decomposition of acetaldehyde, CH₃CHO  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?

(Multiple Choice)

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Question 50

At 25°C, the second-order reaction NOCl(g) NO(g)+ ¹/₂Cl₂(g)is 50% complete after 5.82 hours when the initial concentration of NOCl is 4.46 mol/L. How long will it take for the reaction to be 75% complete?

(Multiple Choice)

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Question 51

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?

(Multiple Choice)

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Question 52

For the first-order reaction 2N₂O₅  2N₂O₄ + O₂ at a particular temperature, the half-life of N₂O₅ is 0.90 hr. What fraction of the initial concentration of N₂O₅ will remain after 2.4 hours?

(Short Answer)

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Question 53

For the chemical reaction A  B + C, a plot of [A]_t versus time is found to give a straight line with a negative slope. What is the order of reaction with respect to A?

(Multiple Choice)

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Question 54

A certain first-order reaction A  B is 25% complete in 42 min at 25°C. What is its rate constant?

(Multiple Choice)

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Question 55

The oxidation of iodide ions by arsenic acid in acidic aqueous solution occurs according to the net reaction H₃AsO₄ + 3I^- + 2 H₃O⁺  H₃AsO₃ + I₃^-+ H₂O.The experimental rate law for this reaction is rate = k [H₃AsO₄] [I^-] [H₃O⁺].What is the order of the reaction with respect to I^-?

(Short Answer)

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Question 56

For what order reaction does the half-life get longer as the initial concentration increases?

(Multiple Choice)

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Question 57

The rate constant for a certain first-order reaction is 0.40/min.What is the initial rate in mole/L·min, if the initial concentration of the compound involved is 0.50 mol/L?

(Short Answer)

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Question 58

At 700 K, the rate constant for the following reaction is 6.2  10^-4 min^-1. How many minutes are required for 20% of a sample of cyclopropane to isomerize to propene?

(Multiple Choice)

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Question 59

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  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?

(Short Answer)

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Question 60

Showing 41 - 60 of 114

Nitric oxide gas (NO)reacts with chlorine gas according to the chemical equation given below. NO + Cl₂  NOCl The following initial rates of reaction have been measured for the given reagent concentrations. Which of the following is the rate law (rate equation)for this reaction?

Which of the following statements is false?

The activation energy for the reaction O + O₃  2O₂ is 25 kJ/mol, and the enthalpy change is H = -388 kJ/mol. What is the activation energy for the decomposition of O₂ by the reverse reaction?

For the chemical reaction A  C, a plot of 1/[A]_t versus time was found to give a straight line with a positive slope. What is the order of reaction?

Which one of the following units would not be an acceptable way to express reaction rate?

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

The thermal decomposition of acetaldehyde, CH₃CHO  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?

At 25°C, the second-order reaction NOCl(g) NO(g)+ ¹/₂Cl₂(g)is 50% complete after 5.82 hours when the initial concentration of NOCl is 4.46 mol/L. How long will it take for the reaction to be 75% complete?

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?

For the first-order reaction 2N₂O₅  2N₂O₄ + O₂ at a particular temperature, the half-life of N₂O₅ is 0.90 hr. What fraction of the initial concentration of N₂O₅ will remain after 2.4 hours?

For the chemical reaction A  B + C, a plot of [A]_t versus time is found to give a straight line with a negative slope. What is the order of reaction with respect to A?

A certain first-order reaction A  B is 25% complete in 42 min at 25°C. What is its rate constant?

For what order reaction does the half-life get longer as the initial concentration increases?

The rate constant for a certain first-order reaction is 0.40/min.What is the initial rate in mole/L·min, if the initial concentration of the compound involved is 0.50 mol/L?

At 700 K, the rate constant for the following reaction is 6.2  10^-4 min^-1. How many minutes are required for 20% of a sample of cyclopropane to isomerize to propene?

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Exam 13: Chemical Kinetics

Nitric oxide gas (NO)reacts with chlorine gas according to the chemical equation given below. NO + Cl2  NOCl The following initial rates of reaction have been measured for the given reagent concentrations. Which of the following is the rate law (rate equation)for this reaction?

Which of the following statements is false?

The activation energy for the reaction O + O3  2O2 is 25 kJ/mol, and the enthalpy change is H = -388 kJ/mol. What is the activation energy for the decomposition of O2 by the reverse reaction?

For the chemical reaction A  C, a plot of 1/[A]t versus time was found to give a straight line with a positive slope. What is the order of reaction?

Which one of the following units would not be an acceptable way to express reaction rate?

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

The thermal decomposition of acetaldehyde, CH3CHO  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?

At 25°C, the second-order reaction NOCl(g) NO(g)+ 1/2Cl2(g) is 50% complete after 5.82 hours when the initial concentration of NOCl is 4.46 mol/L. How long will it take for the reaction to be 75% complete?

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?

For the first-order reaction 2N2O5  2N2O4 + O2 at a particular temperature, the half-life of N2O5 is 0.90 hr. What fraction of the initial concentration of N2O5 will remain after 2.4 hours?

For the chemical reaction A  B + C, a plot of [A]t versus time is found to give a straight line with a negative slope. What is the order of reaction with respect to A?

A certain first-order reaction A  B is 25% complete in 42 min at 25°C. What is its rate constant?

The oxidation of iodide ions by arsenic acid in acidic aqueous solution occurs according to the net reaction H3AsO4 + 3I- + 2 H3O+  H3AsO3 + I3- + H2O.The experimental rate law for this reaction is rate = k [H3AsO4] [I-] [H3O+].What is the order of the reaction with respect to I-?

For what order reaction does the half-life get longer as the initial concentration increases?

The rate constant for a certain first-order reaction is 0.40/min.What is the initial rate in mole/L·min, if the initial concentration of the compound involved is 0.50 mol/L?

At 700 K, the rate constant for the following reaction is 6.2  10-4 min-1. How many minutes are required for 20% of a sample of cyclopropane to isomerize to propene?

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

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Synthetic and Natural Organic Polymers

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Nitric oxide gas (NO)reacts with chlorine gas according to the chemical equation given below. NO + Cl₂  NOCl The following initial rates of reaction have been measured for the given reagent concentrations. Which of the following is the rate law (rate equation)for this reaction?

The activation energy for the reaction O + O₃  2O₂ is 25 kJ/mol, and the enthalpy change is H = -388 kJ/mol. What is the activation energy for the decomposition of O₂ by the reverse reaction?

For the chemical reaction A  C, a plot of 1/[A]_t versus time was found to give a straight line with a positive slope. What is the order of reaction?

The thermal decomposition of acetaldehyde, CH₃CHO  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?

At 25°C, the second-order reaction NOCl(g) NO(g)+ ¹/₂Cl₂(g)is 50% complete after 5.82 hours when the initial concentration of NOCl is 4.46 mol/L. How long will it take for the reaction to be 75% complete?

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?

For the first-order reaction 2N₂O₅  2N₂O₄ + O₂ at a particular temperature, the half-life of N₂O₅ is 0.90 hr. What fraction of the initial concentration of N₂O₅ will remain after 2.4 hours?

For the chemical reaction A  B + C, a plot of [A]_t versus time is found to give a straight line with a negative slope. What is the order of reaction with respect to A?

At 700 K, the rate constant for the following reaction is 6.2  10^-4 min^-1. How many minutes are required for 20% of a sample of cyclopropane to isomerize to propene?