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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![### Hess's Law Activity
#### Description:
- **Hess's Law of Constant Heat Summation:** When two reactions are added together, their individual reaction enthalpies are summed, provided the reactions occur under the same conditions.
#### Diagram Explanation:
The diagram illustrates two chemical reactions and their associated enthalpy changes (\( \Delta H \)):
1. **Reaction 1:**
\[
\text{N}_2(g) + \text{O}_2(g) \rightarrow 2\text{NO}(g)
\]
- Shows the enthalpy change \( \Delta H \) as an extensive property.
2. **Reaction 2:**
\[
2\text{NO}(g) \rightarrow \text{N}_2(g) + \text{O}_2(g)
\]
- Illustrates that \( \Delta H \) changes sign when the reaction is reversed.
### Part B: Reaction Enthalpy Reversal
- **Prompt:**
Click on the ΔH button within the activity to analyze the relationship between two displayed reactions. This demonstrates the reversal effect on reaction enthalpy, \( \Delta H \).
- **Consider the Reaction:**
\[
\text{B}(s) + \frac{3}{2}\text{O}_2(g) \rightarrow \text{B}_2\text{O}_3(s), \quad \Delta H = -1270\, \text{kJ}
\]
- **Question:**
What will \( \Delta H \) be if the reaction is reversed?
- **Instruction:**
Express your answer with appropriate units.
**Input Box for Answer:**
- Value (in kJ)
**Available Hint(s):**
Click to view hints for further guidance.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4a2bd348-d826-4056-b9ee-5fd404bc60f1%2F132497d2-5f85-4aea-9cde-2906f04a1469%2Frvpshzk_processed.png&w=3840&q=75)
Transcribed Image Text:### Hess's Law Activity
#### Description:
- **Hess's Law of Constant Heat Summation:** When two reactions are added together, their individual reaction enthalpies are summed, provided the reactions occur under the same conditions.
#### Diagram Explanation:
The diagram illustrates two chemical reactions and their associated enthalpy changes (\( \Delta H \)):
1. **Reaction 1:**
\[
\text{N}_2(g) + \text{O}_2(g) \rightarrow 2\text{NO}(g)
\]
- Shows the enthalpy change \( \Delta H \) as an extensive property.
2. **Reaction 2:**
\[
2\text{NO}(g) \rightarrow \text{N}_2(g) + \text{O}_2(g)
\]
- Illustrates that \( \Delta H \) changes sign when the reaction is reversed.
### Part B: Reaction Enthalpy Reversal
- **Prompt:**
Click on the ΔH button within the activity to analyze the relationship between two displayed reactions. This demonstrates the reversal effect on reaction enthalpy, \( \Delta H \).
- **Consider the Reaction:**
\[
\text{B}(s) + \frac{3}{2}\text{O}_2(g) \rightarrow \text{B}_2\text{O}_3(s), \quad \Delta H = -1270\, \text{kJ}
\]
- **Question:**
What will \( \Delta H \) be if the reaction is reversed?
- **Instruction:**
Express your answer with appropriate units.
**Input Box for Answer:**
- Value (in kJ)
**Available Hint(s):**
Click to view hints for further guidance.
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