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Classify the following by the sign of delta U for the system: the following can be classified into these three categories (negative,positive, not enough data)

1. The system contracts and the surroundings get cooler.
2. The system expands and the surroundings get cooler.
3. The system contracts and the surroundings get hotter.
4. The system expands and the surroundings get hotter.

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Category:- Chemistry
Reference No.:- M91095679

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