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AP Physics 2
9.6 Entropy and the Second Law of Thermodynamics
IntermediateMCQConceptual23.7k
A rectangular box divided into two equal compartments, labeled Side A on the left and Side B on the right, separated by a vertical wall with a central valve symbol. Side A contains four small black circles representing gas particles distributed within the left chamber. Side B is empty, representing a vacuum. No other labels, arrows, or lines appear.
Gas particles in a partitioned container before opening the valve.
A thermally insulated, rigid container is divided into two equal compartments, Side A and Side B, by a wall containing a closed valve. Side A contains \(4\) ideal gas particles, and Side B is completely evacuated. The valve is then opened, allowing the gas particles to freely expand and occupy the entire container. Which of the following statements correctly compares the state of the gas after the expansion to its initial state and provides a valid justification?

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