Textbook Question
Draw a reaction coordinate diagram for a reaction in which
a. the product is thermodynamically unstable and kinetically unstable.
b. the product is thermodynamically unstable and kinetically stable.
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Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 31b
Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 31bChapter 6, Problem 31b
The rate of the reaction of methyl chloride with hydroxide ion is linearly dependent on both the concentration of methyl chloride and the concentration hydroxide ion. At 30 °C, the constant (k) for the reaction is 1.0 × 10-5 M-1 s-1
b. If the concentration of methyl chloride is decreased to 0.010 M, what will be the effect on
1. the rate of the reaction?
2. the rate constant for the reaction?
Verified step by step guidance1
Step 1: Recognize that the reaction follows second-order kinetics because the rate is linearly dependent on both the concentration of methyl chloride ([CH3Cl]) and hydroxide ion ([OH⁻]). The rate law can be expressed as: .
Step 2: Understand that the rate constant (k) is a property of the reaction and depends only on temperature. Since the temperature (30 °C) is constant, the rate constant (k = 1.0 × 10⁻⁵ M⁻¹ s⁻¹) will remain unchanged regardless of the change in concentration of methyl chloride.
Step 3: To determine the effect on the rate of the reaction, note that the rate is directly proportional to the concentration of methyl chloride. If the concentration of methyl chloride is decreased to 0.010 M, substitute this value into the rate law equation to observe the proportional change in the rate.
Step 4: Compare the new rate to the original rate. If the original concentration of methyl chloride was higher, say [CH3Cl]₀, the new rate will be reduced proportionally by the ratio of the new concentration (0.010 M) to the original concentration ([CH3Cl]₀). This demonstrates that the rate decreases as the concentration of methyl chloride decreases.
Step 5: Summarize the effects: (1) The rate of the reaction will decrease proportionally to the decrease in the concentration of methyl chloride. (2) The rate constant (k) will remain unchanged because it is independent of reactant concentrations and depends only on temperature.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Rate of Reaction
The rate of a chemical reaction refers to the speed at which reactants are converted into products. It is typically expressed in terms of the change in concentration of a reactant or product over time. In this case, the rate is directly proportional to the concentrations of both methyl chloride and hydroxide ion, indicating a second-order reaction.
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Rate Constant (k)
The rate constant (k) is a proportionality factor that relates the rate of a reaction to the concentrations of the reactants. It is specific to a given reaction at a particular temperature. In this scenario, the rate constant remains unchanged regardless of the concentrations of the reactants, as it is a characteristic of the reaction itself at 30 °C.
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Concentration Effects on Reaction Rate
In a reaction where the rate is dependent on the concentrations of reactants, changing the concentration of one reactant will affect the overall rate. If the concentration of methyl chloride is decreased, the rate of the reaction will also decrease proportionally, while the rate constant (k) will remain constant, as it is independent of reactant concentrations.
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Related Practice
Textbook Question
From the Arrhenius equation, predict how
b. increasing the temperature affects the rate constant for a reaction.
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Textbook Question
Convert the following perspective formulas to Fischer projections.
(c)
(d)
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Textbook Question
From the Arrhenius equation, predict how
a. increasing the experimental activation energy affects the rate constant for a reaction.
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Textbook Question
The rate constant for a reaction can be increased by ______ the stability of the reactant or by ______ the stability of the transition state.
1094
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Textbook Question
Rank the following compounds from most stable to least stable:
trans-3-hexene, cis-3-hexene, cis-2,5-dimethyl-3-hexene, (Z)-3,4-dimethyl-3-hexene
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