Ch. 17 BR #2: Entropy

Front

What is thermodynamics?

Back

Thermodynamics is the study of heat energy turning into other forms of energy.

Front

What does a positive change in entropy (ΔS) indicate?

Back

A positive change in entropy (ΔS) indicates an increase in disorder or randomness in a system.

Front

Which reaction has a positive ΔS?

Back

C₂H₂O₂(g) → 2CO(g) + H₂(g) represents a reaction with a positive ΔS.

Front

What process represents a decrease in entropy?

Back

The condensation of steam on cold glass represents a decrease in entropy.

Front

What does the thermodynamics equation imply about total entropy?

Back

The equation implies that total entropy only increases or stays the same.

Front

True or False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction.

Back

True.

Front

Define entropy in the context of thermodynamics.

Back

Entropy is a measure of the disorder or randomness in a system.

Front

What is the second law of thermodynamics?

Back

The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time.

Front

How does temperature affect entropy?

Back

As temperature increases, the entropy of a system generally increases due to greater molecular motion.

Front

What is an example of a process that increases entropy?

Back

The sublimation of dry ice (CO₂) into gas increases entropy.