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Endothermic phase changes - the substance is gaining energy (being heated) and the molecules are getting more active.

- solid to liquid: melting

- liquid to gas: vaporization

- solid to gas: sublimation

Exothermic phase changes - the substance is losing energy (cooling) and the molecules are slowing down.

- gas to liquid: condensation

- liquid to solid: freezing

- gas to solid: deposition

Memory helper: exo is like exit, and the heat energy exits the substance during an exothermic phase change.

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12y ago

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