and D stand for some unknown chemical formulas.) Here is an energy diagram for the reaction: 400 300 energy 200 (k]/mol) C + D A + B 100- reaction coordinate Use the energy diagram to answer these questions.

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### Reaction Energy Diagram

(In this equation \( A \), \( B \), \( C \), and \( D \) stand for some unknown chemical formulas.)

#### Here is an energy diagram for the reaction:

![Energy Diagram](image URL)

**Graph Description:**
- **Y-axis (Vertical)**: Energy (kJ/mol)
- **X-axis (Horizontal)**: Reaction Coordinate
- The graph starts with the energy level of reactants \( A + B \) which is labeled at approximately 100 kJ/mol.
- It then rises to a peak (activation energy) at around 400 kJ/mol.
- The energy level descends to the energy level of products \( C + D \) at approximately 200 kJ/mol.

#### Use the energy diagram to answer these questions:

| Question | Options |
| --- | --- |
| **What is the heat of reaction?** | \_\_\_\_ kJ/mol |
| **Is the reaction exothermic or endothermic?** | - Exothermic <br> - Endothermic <br> - Neither |
| **Can you determine the activation energy?** | - Yes, it's \_\_\_\_ kJ/mol <br> - No |
| **Can you determine the activation energy of the reverse reaction?** \( C + D \rightarrow A + B \) | - Yes, it's \_\_\_\_ kJ/mol <br> - No |

---

### Explanation:
- **Heat of Reaction (ΔH)**: The difference in energy between reactants \( A + B \) and products \( C + D \).
- **Exothermic or Endothermic**: Determine based on whether the products have higher or lower energy than the reactants.
- **Activation Energy**: The energy difference between the reactants and the peak of the graph.
- **Activation Energy of Reverse Reaction**: The energy difference between the products and the peak of the graph.
Transcribed Image Text:### Reaction Energy Diagram (In this equation \( A \), \( B \), \( C \), and \( D \) stand for some unknown chemical formulas.) #### Here is an energy diagram for the reaction: ![Energy Diagram](image URL) **Graph Description:** - **Y-axis (Vertical)**: Energy (kJ/mol) - **X-axis (Horizontal)**: Reaction Coordinate - The graph starts with the energy level of reactants \( A + B \) which is labeled at approximately 100 kJ/mol. - It then rises to a peak (activation energy) at around 400 kJ/mol. - The energy level descends to the energy level of products \( C + D \) at approximately 200 kJ/mol. #### Use the energy diagram to answer these questions: | Question | Options | | --- | --- | | **What is the heat of reaction?** | \_\_\_\_ kJ/mol | | **Is the reaction exothermic or endothermic?** | - Exothermic <br> - Endothermic <br> - Neither | | **Can you determine the activation energy?** | - Yes, it's \_\_\_\_ kJ/mol <br> - No | | **Can you determine the activation energy of the reverse reaction?** \( C + D \rightarrow A + B \) | - Yes, it's \_\_\_\_ kJ/mol <br> - No | --- ### Explanation: - **Heat of Reaction (ΔH)**: The difference in energy between reactants \( A + B \) and products \( C + D \). - **Exothermic or Endothermic**: Determine based on whether the products have higher or lower energy than the reactants. - **Activation Energy**: The energy difference between the reactants and the peak of the graph. - **Activation Energy of Reverse Reaction**: The energy difference between the products and the peak of the graph.
### Interpreting a Reaction Energy Diagram

**Consider a hypothetical chemical reaction:**
\[ A + B \leftrightarrow C + D \]

*(In this equation \( A \), \( B \), \( C \), and \( D \) stand for some unknown chemical formulas.)*

Here is an energy diagram for the reaction:

![Energy Diagram](path-to-image)

#### Diagram Description:

- **X-axis (Reaction Coordinate)**: This axis indicates the progress of the reaction from reactants to products.
- **Y-axis (Energy in kJ/mol)**: This axis shows the energy level of the reactants and products.
- The diagram follows these key points:
  - The reactants (\(A + B\)) start at an energy level just above 100 kJ/mol.
  - There is a peak energy level that goes up to around 400 kJ/mol, indicating the highest energy state (activation energy).
  - The products (\(C + D\)) stabilize at an energy level just below 100 kJ/mol, indicating that the products have a lower energy than the reactants.

#### Use the energy diagram to answer these questions:

1. **What is the heat of reaction?**
   \[ \_\_\_\_ \text{kJ/mol} \]

2. **Is the reaction exothermic or endothermic?**
   - \(\_\) Exothermic
   - \(\_\) Endothermic
   - \(\_\) Neither

3. **Can you determine the activation energy?**
   - \(\_\) Yes, it is \_\_\_\_ kJ/mol
   - \(\_\) No

4. **Can you determine the activation energy of the reverse reaction?**
   - \(\_\) Yes, it is \_\_\_\_ kJ/mol
Transcribed Image Text:### Interpreting a Reaction Energy Diagram **Consider a hypothetical chemical reaction:** \[ A + B \leftrightarrow C + D \] *(In this equation \( A \), \( B \), \( C \), and \( D \) stand for some unknown chemical formulas.)* Here is an energy diagram for the reaction: ![Energy Diagram](path-to-image) #### Diagram Description: - **X-axis (Reaction Coordinate)**: This axis indicates the progress of the reaction from reactants to products. - **Y-axis (Energy in kJ/mol)**: This axis shows the energy level of the reactants and products. - The diagram follows these key points: - The reactants (\(A + B\)) start at an energy level just above 100 kJ/mol. - There is a peak energy level that goes up to around 400 kJ/mol, indicating the highest energy state (activation energy). - The products (\(C + D\)) stabilize at an energy level just below 100 kJ/mol, indicating that the products have a lower energy than the reactants. #### Use the energy diagram to answer these questions: 1. **What is the heat of reaction?** \[ \_\_\_\_ \text{kJ/mol} \] 2. **Is the reaction exothermic or endothermic?** - \(\_\) Exothermic - \(\_\) Endothermic - \(\_\) Neither 3. **Can you determine the activation energy?** - \(\_\) Yes, it is \_\_\_\_ kJ/mol - \(\_\) No 4. **Can you determine the activation energy of the reverse reaction?** - \(\_\) Yes, it is \_\_\_\_ kJ/mol
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