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Which process involves a decrease in entropy?
burning natural gas
water freezing into ice
water evaporating on heating
dry ice subliming

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Answered by GPT-5 mini AI
Water freezing into ice.

Explanation: freezing (liquid → solid) makes the molecules more ordered, so the system's entropy decreases. The other listed processes (burning, evaporating, subliming) increase entropy because they produce more disordered gaseous products or distribute energy more widely. (Note: even when a system's entropy falls, the total entropy of system+surroundings can still increase.)