Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Consider a hypothetical
→+AB+CD
(In this equation
A, B, C and D
stand for some unknown chemical formulas.)
Here is an energy diagram for the reaction:
Use the energy diagram to answer these questions.
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Transcribed Image Text:### Energy Diagram for a Chemical Reaction
#### Description
The diagram shown is an energy profile of a chemical reaction. On the y-axis, the energy is measured in kilojoules per mole (kJ/mol). The x-axis represents the reaction coordinate, which tracks the progress of the reaction from reactants to products.
#### Key Elements of the Diagram:
1. **Reactants**:
- The starting point on the diagram is labeled \( A + B \).
- At this point, the energy level is approximately 100 kJ/mol.
2. **Transition State**:
- The peak of the diagram represents the transition state, where the energy is the highest.
- The energy at this peak is around 400 kJ/mol.
3. **Products**:
- The ending point on the diagram is labeled \( C + D \).
- The energy level for the products is approximately 150 kJ/mol.
#### Explanation:
This energy diagram illustrates the energy change that occurs during the reaction from \( A + B \) to \( C + D \). Initially, the reactants \( A + B \) have an energy level of around 100 kJ/mol. As the reaction progresses, the system absorbs energy until it reaches the transition state with an energy of approximately 400 kJ/mol. After this peak, the energy decreases and stabilizes at 150 kJ/mol for the products \( C + D \).
This diagram shows that the reaction is **endothermic**, as the products have a higher energy (150 kJ/mol) compared to the reactants (100 kJ/mol).
Understanding such energy diagrams is crucial for grasping the concepts of activation energy and the energy profile of chemical reactions.
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