Describe the relationship of enthalpy, work, and internal energy. Calculate the AU for these reactions and determine if these reactions do work on the surroundings. The First Law of Thermodynamics states AU = Q + W. Imagine a container of gas with a moveable piston (shown below). Heat is transferred into the system ( pressure on the piston and move it. The gas is doing work on the piston which is _). The gas molecules will expand and put A) -Q; +W В) -Q; -W Heat Added С) +Q; -W D) +Q; +W

Chemistry
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Chapter1: Chemical Foundations
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**Understanding the First Law of Thermodynamics:**

The First Law of Thermodynamics states: \(\Delta U = Q + W\).

**Concept Explanation:**

- \(\Delta U\) represents the change in internal energy of the system.
- \(Q\) is the heat added to the system.
- \(W\) is the work done by the system on its surroundings.

**Scenario:**

Imagine a container of gas with a moveable piston. When heat is transferred into the system (\( \_\_\_\_\_ \)), the gas molecules expand, exerting pressure on the piston and causing it to move. The gas is doing work on the piston, which is \( \_\_\_\_\_ \).

**Diagram Explanation:**

The diagram shows two images:

1. **Left Image:** 
   - A container with gas molecules at the bottom. The piston is at an intermediate level.
   - Label: "Heat Added" (indicating the direction of heat transfer into the system).

2. **Right Image:** 
   - The gas has expanded, pushing the piston upward due to heat addition.

**Multiple Choice Question:**

Determine the correct relationship between \( Q \) and \( W \) based on the scenario:

A) \(-Q; +W\)

B) \(-Q; -W\)

C) \(+Q; -W\)

D) \(+Q; +W\)

**Correct Answer: D) \(+Q; +W\)**

- Heat is added to the system (\( +Q \)).
- Work is done by the system on the piston (\( +W \)).
Transcribed Image Text:**Understanding the First Law of Thermodynamics:** The First Law of Thermodynamics states: \(\Delta U = Q + W\). **Concept Explanation:** - \(\Delta U\) represents the change in internal energy of the system. - \(Q\) is the heat added to the system. - \(W\) is the work done by the system on its surroundings. **Scenario:** Imagine a container of gas with a moveable piston. When heat is transferred into the system (\( \_\_\_\_\_ \)), the gas molecules expand, exerting pressure on the piston and causing it to move. The gas is doing work on the piston, which is \( \_\_\_\_\_ \). **Diagram Explanation:** The diagram shows two images: 1. **Left Image:** - A container with gas molecules at the bottom. The piston is at an intermediate level. - Label: "Heat Added" (indicating the direction of heat transfer into the system). 2. **Right Image:** - The gas has expanded, pushing the piston upward due to heat addition. **Multiple Choice Question:** Determine the correct relationship between \( Q \) and \( W \) based on the scenario: A) \(-Q; +W\) B) \(-Q; -W\) C) \(+Q; -W\) D) \(+Q; +W\) **Correct Answer: D) \(+Q; +W\)** - Heat is added to the system (\( +Q \)). - Work is done by the system on the piston (\( +W \)).
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