O A OB Which of the following shows a concerted reaction with a positive AG? سن منها D reaction coordinate A با جایا reaction coordinate B. Oc O none of the possible answers are correct reaction coordinate reaction coordinate

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Chapter1: Chemical Foundations
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### Which of the following shows a concerted reaction with a positive ΔG?

This question addresses the concept of reaction coordinate diagrams in the study of chemical kinetics. Reaction coordinate diagrams plot the free energy (ΔG) of a system as a function of the reaction coordinate, which represents the progress of the reaction from reactants to products.

Below are four reaction coordinate diagrams labeled A, B, C, and D. Each diagram displays the change in free energy along the reaction coordinate.

#### Diagrams Explanation:

1. **Diagram A:**
   - Two peaks and one intermediate valley.
   - Suggests a multi-step reaction with at least one intermediate stage.

2. **Diagram B:**
   - Two peaks and one intermediate valley, similar to Diagram A.
   - Represents a multi-step reaction with intermediates.

3. **Diagram C:**
   - A single peak.
   - This indicates a single-step reaction without intermediates, possibly concerted.

4. **Diagram D:**
   - A single peak followed by a rise in free energy.
   - Indicates a single-step reaction with a positive ΔG.

#### Multiple-Choice Options:

- ⭘ **A**
- ⭘ **B**
- ⭘ **C**
- ⭘ **none of the possible answers are correct**
- ⭘ **D**

The correct option will identify the reaction diagram that represents a concerted reaction with a positive ΔG.

For further practice, consider what a positive ΔG implies about the spontaneity and feasibility of the reaction, and how the shape of the reaction coordinate diagram reflects this.
Transcribed Image Text:### Which of the following shows a concerted reaction with a positive ΔG? This question addresses the concept of reaction coordinate diagrams in the study of chemical kinetics. Reaction coordinate diagrams plot the free energy (ΔG) of a system as a function of the reaction coordinate, which represents the progress of the reaction from reactants to products. Below are four reaction coordinate diagrams labeled A, B, C, and D. Each diagram displays the change in free energy along the reaction coordinate. #### Diagrams Explanation: 1. **Diagram A:** - Two peaks and one intermediate valley. - Suggests a multi-step reaction with at least one intermediate stage. 2. **Diagram B:** - Two peaks and one intermediate valley, similar to Diagram A. - Represents a multi-step reaction with intermediates. 3. **Diagram C:** - A single peak. - This indicates a single-step reaction without intermediates, possibly concerted. 4. **Diagram D:** - A single peak followed by a rise in free energy. - Indicates a single-step reaction with a positive ΔG. #### Multiple-Choice Options: - ⭘ **A** - ⭘ **B** - ⭘ **C** - ⭘ **none of the possible answers are correct** - ⭘ **D** The correct option will identify the reaction diagram that represents a concerted reaction with a positive ΔG. For further practice, consider what a positive ΔG implies about the spontaneity and feasibility of the reaction, and how the shape of the reaction coordinate diagram reflects this.
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