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# First Law of Thermodynamics Quiz

Created by
@SmoothTriumph

### According to the first law of thermodynamics, which of the following statements is true?

Energy can only be converted from one form to another in an isolated system

### What is the principle summarized by the first law of thermodynamics?

Energy is conserved in an isolated system

### In an isolated system, what happens to the total energy?

It remains constant

### Which of the following is a measure of the randomness or disorder in a system?

<p>Entropy</p> Signup and view all the answers

### According to the second law of thermodynamics, what tends to happen to the entropy of an isolated system over time?

<p>Increases</p> Signup and view all the answers

### What does the second law of thermodynamics imply about the efficiency of a heat engine?

<p>It cannot be perfectly efficient</p> Signup and view all the answers

### According to the third law of thermodynamics, what happens to the entropy of a pure, perfectly crystalline substance as the temperature approaches absolute zero?

<p>It decreases</p> Signup and view all the answers

### What is the temperature in Kelvin at which the entropy of a pure, perfectly crystalline substance approaches zero?

<p>0 Kelvin</p> Signup and view all the answers

### Is it possible to reach absolute zero through any finite number of processes?

<p>No</p> Signup and view all the answers

### Which of the following factors can influence the amount of entropy present in a system at a particular state?

<p>Change in concentration</p> Signup and view all the answers

### What does a positive value of ∆S indicate?

<p>The final state is more random or disordered than the initial state</p> Signup and view all the answers

### What is free energy, G, in the context of spontaneous reactions?

<p>The energy available to do useful work</p> Signup and view all the answers

## Study Notes

### Laws of Thermodynamics

• The first law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another.

### First Law of Thermodynamics

• In an isolated system, the total energy remains constant, meaning it is conserved.

### Second Law of Thermodynamics

• The second law of thermodynamics summarizes that the total entropy of an isolated system always increases over time or remains constant in ideal cases.
• Entropy, a measure of randomness or disorder in a system, tends to increase in an isolated system over time.

### Efficiency of Heat Engines

• The second law of thermodynamics implies that the efficiency of a heat engine is less than 100%, meaning not all energy can be converted into useful work.

### Third Law of Thermodynamics

• The third law of thermodynamics states that as the temperature of a pure, perfectly crystalline substance approaches absolute zero, its entropy approaches zero.
• The temperature at which the entropy of a pure, perfectly crystalline substance approaches zero is 0 K (absolute zero).

### Reaching Absolute Zero

• It is impossible to reach absolute zero through any finite number of processes.

### Factors Influencing Entropy

• The amount of entropy present in a system at a particular state can be influenced by various factors.

### Entropy Change (∆S)

• A positive value of ∆S indicates an increase in the disorder or randomness of a system.

### Free Energy (G)

• Free energy (G) is a measure of the energy available to do work in spontaneous reactions.

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## Description

Test your knowledge of the First Law of Thermodynamics and its principle of energy conservation with this quiz. Explore how energy is transferred and converted in isolated systems and discover why the total energy remains constant.

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