IB Physics HL B 4 8 Hl Local Entropy Decrease Questions

Analyse HL cases where a system’s entropy decreases locally, explaining compensating entropy changes in the surroundings and the required increase for the universe.

Exam points

Explain how a system can lose entropy during a change, such as compression or cooling, while the surroundings gain entropy as heat is transferred.
Apply the second law by comparing the system and surroundings: the surroundings must gain more entropy than the system loses for the total entropy of the universe to increase.

[Maximum number: 1]

A gas is compressed at constant temperature.

What are the changes in entropy of the gas and its surroundings during the compression?

Entropy of the gas

Entropy of surroundings

Increases

Decreases

Increases

Decreases

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IB Physics HL B 4 8 Hl Local Entropy Decrease Questions question 1