3. Draw a reaction coordinate diagram for ... an exergonic reaction Free energy Progress of the reaction Free energy ... a two-step reaction where the reactants are the most stable species *** Progress of the reaction *** a reaction that has one intermediate Free energy Progress of the reaction ... a three-step reaction, in which the second step has the highest energy of activation Free energy Progress of the reaction

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Description of the Graphical Content:**

This image comprises two graphs illustrating different reaction pathways in terms of free energy over the course of a reaction.

**First Graph:**
- **Title:** A two-step reaction where the products and reactants are degenerate (equal in energy).
- **Axes:** 
  - Vertical axis: Free energy
  - Horizontal axis: Progress of the reaction
- **Explanation:** This graph would typically represent a reaction with two steps, wherein the energy levels of the reactants and products are the same, indicating that there is no net change in free energy from the reactants to the products.

**Second Graph:**
- **Title:** A reaction that proceeds through three transition states.
- **Axes:** 
  - Vertical axis: Free energy
  - Horizontal axis: Progress of the reaction
- **Explanation:** This graph likely depicts a multi-step reaction involving three transition states. Each transition state indicates a peak in free energy, representing the energy barrier that must be overcome during the reaction to proceed to the next step.

Both graphs provide a conceptual understanding of the energy profile during chemical reactions, highlighting the differences in complexity and energy changes involved in reactions with varying numbers of steps and transition states.
Transcribed Image Text:**Description of the Graphical Content:** This image comprises two graphs illustrating different reaction pathways in terms of free energy over the course of a reaction. **First Graph:** - **Title:** A two-step reaction where the products and reactants are degenerate (equal in energy). - **Axes:** - Vertical axis: Free energy - Horizontal axis: Progress of the reaction - **Explanation:** This graph would typically represent a reaction with two steps, wherein the energy levels of the reactants and products are the same, indicating that there is no net change in free energy from the reactants to the products. **Second Graph:** - **Title:** A reaction that proceeds through three transition states. - **Axes:** - Vertical axis: Free energy - Horizontal axis: Progress of the reaction - **Explanation:** This graph likely depicts a multi-step reaction involving three transition states. Each transition state indicates a peak in free energy, representing the energy barrier that must be overcome during the reaction to proceed to the next step. Both graphs provide a conceptual understanding of the energy profile during chemical reactions, highlighting the differences in complexity and energy changes involved in reactions with varying numbers of steps and transition states.
### Reaction Coordinate Diagrams

1. **Exergonic Reaction**:
   - A graph with an axis labeled "Free energy" on the vertical and "Progress of the reaction" on the horizontal.
   - Illustrates a downward-sloping line or curve, indicating a decrease in free energy as the reaction progresses, characterizing an exergonic reaction.

2. **Reaction with One Intermediate**:
   - Similar axes as above.
   - Depicts a curve that initially rises, peaks with an intermediate state, and then falls, showing the presence of an energy intermediate in the reaction pathway.

3. **Two-Step Reaction with Stable Reactants**:
   - Axes remain the same.
   - Represents a two-step reaction where the energy initially rises to a peak, indicating an activated complex, followed by a drop with reactants at the lowest energy point, highlighting their stability.

4. **Three-Step Reaction with Highest Energy in Second Step**:
   - Maintains the same axes.
   - Shows a multi-peaked graph where the second peak is the highest, denoting that the second step has the highest activation energy in a three-step process.

Each plot provides an illustrative view of energy changes during the reaction course, aiding in the understanding of reaction mechanisms and energetics.
Transcribed Image Text:### Reaction Coordinate Diagrams 1. **Exergonic Reaction**: - A graph with an axis labeled "Free energy" on the vertical and "Progress of the reaction" on the horizontal. - Illustrates a downward-sloping line or curve, indicating a decrease in free energy as the reaction progresses, characterizing an exergonic reaction. 2. **Reaction with One Intermediate**: - Similar axes as above. - Depicts a curve that initially rises, peaks with an intermediate state, and then falls, showing the presence of an energy intermediate in the reaction pathway. 3. **Two-Step Reaction with Stable Reactants**: - Axes remain the same. - Represents a two-step reaction where the energy initially rises to a peak, indicating an activated complex, followed by a drop with reactants at the lowest energy point, highlighting their stability. 4. **Three-Step Reaction with Highest Energy in Second Step**: - Maintains the same axes. - Shows a multi-peaked graph where the second peak is the highest, denoting that the second step has the highest activation energy in a three-step process. Each plot provides an illustrative view of energy changes during the reaction course, aiding in the understanding of reaction mechanisms and energetics.
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