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Which of the following pairs of phase changes is endothermic?


Which of the following pairs of phase changes is endothermic?

  1. melting and freezing

  2. vaporization and melting

  3. sublimation and condensation

  4. deposition and vaporization

  5. freezing and condensation

Solution: An endothermic reaction absorbs heat while an exothermic reaction releases heat. As solid turns into liquid (melting) and liquid turns into gas (vaporization), heat is absorbed. Heat is released when gas turns into liquid (condensation) and liquid turns into solid (freezing). Choice B is the correct answer.


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