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Enthalpy and Phase Changes

Question 1 • Foothill-B Period-Chemistry-26/27B

For each example of a phase change, identify whether heat is absorbed from the surroundings or released into the surroundings.A popsicle melts on a hot day.

Answer
A
heat absorbed
B
heat released

Explanation

Melting requires energy to loosen the particles from their solid arrangement. The popsicle takes this heat from the warmer surroundings, so heat is absorbed.

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