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AP Physics 2
9.6 Entropy and the Second Law of Thermodynamics
BeginnerMCQConceptual21.7k
A rectangular, thermally insulated box divided into two equal square chambers, labeled Chamber 1 on the left and Chamber 2 on the right, separated by a thin vertical divider with a valve in the middle. Chamber 1 contains small dots representing ideal gas molecules in random motion. Chamber 2 is completely empty and labeled vacuum. No other labels, lines, text, or axes appear.
Gas expanding freely into an evacuated chamber.
A rigid, thermally insulated container is divided into two equal chambers by a closed valve. One chamber contains an ideal gas, and the other chamber is evacuated. The valve is opened, allowing the gas to expand freely into the second chamber until equilibrium is reached. Which of the following claims correctly describes the change in entropy of the gas and its final macroscopic distribution?

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