On the energy diagram below, which arrows represent the activation energy?
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:### Analyzing Activation Energy in Chemical Reactions
**Question:**
On the energy diagram below, which arrows represent the activation energy?
**Diagram Description:**
The energy diagram plots the reaction coordinate (x-axis) against energy (y-axis), illustrating the energy changes during a chemical reaction. It starts with the reactants at a certain energy level, which then rise to a peak (representing the transition state) before descending to the energy level of the products. Three arrows are depicted in the diagram:
- Arrow 1: Extends from the reactants' energy level to the peak of the transition state.
- Arrow 2: Extends from the products' energy level to the peak of the transition state.
- Arrow 3: Extends from the products' energy level to the reactants' energy level.
**Options:**
A. Arrow 1 is the activation energy for both the forward and reverse reactions.
B. Arrow 1 is the activation energy for the forward reaction and arrow 2 is the activation energy for the reverse reaction.
C. Arrow 1 is the activation energy for the forward reaction and arrow 3 is the activation energy for the reverse reaction.
D. Arrow 3 is the activation for the forward reaction and arrow 2 is the activation energy for the reverse reaction.
**Answer:**
**B. Arrow 1 is the activation energy for the forward reaction and arrow 2 is the activation energy for the reverse reaction.**
### Explanation of Terms:
**Activation Energy:**
- The minimum amount of energy required to initiate a chemical reaction.
- For the **forward reaction**, it is the energy needed to go from reactants to the transition state (represented by Arrow 1).
- For the **reverse reaction**, it is the energy needed to go from products to the transition state (represented by Arrow 2).
Understanding these concepts is essential for mastering reaction kinetics and thermodynamics in chemistry.
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