A,H negative (-) - When the reaction is product favored only at high temperature. A,S" positive (+) - When the reaction is product favored only at high temperature. A,H° positive (+) - When the reaction is product favored at all temperatures. positive (+) - When the reaction is product favored at all temperatures. Evaluate Incorrect
A,H negative (-) - When the reaction is product favored only at high temperature. A,S" positive (+) - When the reaction is product favored only at high temperature. A,H° positive (+) - When the reaction is product favored at all temperatures. positive (+) - When the reaction is product favored at all temperatures. Evaluate Incorrect
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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Question
How can i predict the signs of each of these? Please explain why and how. Also the options maybe -,+,0, or unknown.

Transcribed Image Text:### Understanding Reaction Favorability in Terms of Thermodynamics
In thermodynamics, the favorability of a reaction is often determined by changes in enthalpy (\(\Delta_r H^\circ\)) and entropy (\(\Delta_r S^\circ\)).
1. **\(\Delta_r H^\circ\) - Enthalpy Change**
- **Negative (-)**: Indicates that the reaction is exothermic, meaning it releases heat. The reaction is product-favored only at high temperatures.
2. **\(\Delta_r S^\circ\) - Entropy Change**
- **Positive (+)**: Indicates an increase in disorder or randomness in the system. The reaction is product-favored only at high temperatures.
3. **\(\Delta_r H^\circ\) - Enthalpy Change**
- **Positive (+)**: Indicates that the reaction is endothermic, meaning it absorbs heat. The reaction is product-favored at all temperatures.
4. **\(\Delta_r S^\circ\) - Entropy Change**
- **Positive (+)**: As before, this indicates an increase in disorder. The reaction is product-favored at all temperatures.
When evaluating these thermodynamic properties, the labels provided were incorrect, highlighting the importance of assessing both enthalpic and entropic changes to determine under which conditions a reaction is favored.

Transcribed Image Text:For a reaction at constant temperature and pressure, what can you determine about ΔH° and ΔS° in each of the following cases? In each case, write positive or negative as your answers.
**ΔrH°**
- **positive (+):** When the reaction is not product favored at any temperature.
**ΔrS°**
- **negative (-):** When the reaction is not product favored at any temperature.
**ΔrH°**
- **positive (+):** When the reaction is product favored only at low temperature.
**ΔrS°**
- **positive (+):** When the reaction is product favored only at low temperature.
**ΔrH°**
- **negative (-):** When the reaction is product favored only at high temperature.
**ΔrS°**
- **positive (+):** When the reaction is product favored only at high temperature.
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