Negative and Positive Sings of Enthalpy System - Heat from the system ΔΗ A+B C+D When a reaction results in evolution of heat, it is said to bel energy flows system). system What happens to the temperature of the system? Surroundings- everything else in the universe Heat by the system ΔΗ When a reaction absorbs energy from the surroundings, it is called an reaction. What happens to the temperature of the system?
Negative and Positive Sings of Enthalpy System - Heat from the system ΔΗ A+B C+D When a reaction results in evolution of heat, it is said to bel energy flows system). system What happens to the temperature of the system? Surroundings- everything else in the universe Heat by the system ΔΗ When a reaction absorbs energy from the surroundings, it is called an reaction. What happens to the temperature of the system?
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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![**Negative and Positive Signs of Enthalpy**
**Diagram Explanation:**
- There is a central flask labeled "system" containing substances A + B transforming into C + D.
- The system is surrounded by an area labeled "Surroundings – everything else in the universe."
**Energy Flow:**
- The left side shows heat flowing from the system to the surroundings with a red arrow.
- The right side shows heat absorbed by the system from the surroundings with a blue arrow.
**Text Annotations:**
- Left side (exothermic reaction):
- "Heat from the system"
- "ΔH" (negative)
- Box explanation: "When a reaction results in the evolution of heat, it is said to be an [exothermic] (energy flows from the system)."
- Question: "What happens to the temperature of the system?"
- Right side (endothermic reaction):
- "Heat by the system"
- "ΔH" (positive)
- Box explanation: "When a reaction absorbs energy from the surroundings, it is called an [endothermic] reaction."
- Question: "What happens to the temperature of the system?"
**Key Concepts:**
- Exothermic reactions release heat, resulting in a negative change in enthalpy (ΔH).
- Endothermic reactions absorb heat, resulting in a positive change in enthalpy (ΔH).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fde686ef5-033a-45f4-bd25-d59cf7ce0821%2F45e9631d-214a-47e0-90d5-c761395e837d%2Fgjhmcj_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Negative and Positive Signs of Enthalpy**
**Diagram Explanation:**
- There is a central flask labeled "system" containing substances A + B transforming into C + D.
- The system is surrounded by an area labeled "Surroundings – everything else in the universe."
**Energy Flow:**
- The left side shows heat flowing from the system to the surroundings with a red arrow.
- The right side shows heat absorbed by the system from the surroundings with a blue arrow.
**Text Annotations:**
- Left side (exothermic reaction):
- "Heat from the system"
- "ΔH" (negative)
- Box explanation: "When a reaction results in the evolution of heat, it is said to be an [exothermic] (energy flows from the system)."
- Question: "What happens to the temperature of the system?"
- Right side (endothermic reaction):
- "Heat by the system"
- "ΔH" (positive)
- Box explanation: "When a reaction absorbs energy from the surroundings, it is called an [endothermic] reaction."
- Question: "What happens to the temperature of the system?"
**Key Concepts:**
- Exothermic reactions release heat, resulting in a negative change in enthalpy (ΔH).
- Endothermic reactions absorb heat, resulting in a positive change in enthalpy (ΔH).
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