Q:

What are some exothermic and endothermic phase changes?

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Quick Answer

Sublimation, when a solid transforms into a gas, is an endothermic phrase change, while deposition, when a gas transforms to a solid, is an exothermic phase change. There are a total of six phase changes in matter, and three are endothermic and three are exothermic. An endothermic phase change absorbs heat or energy, while an exothermic phase change releases heat or energy, states the Washington University Department of Chemistry.

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Full Answer

The following are additional endothermic phase changes:

  • Fusion, or melting, when a solid transforms to liquid
  • Vaporization, when a liquid transforms to gas

The following are exothermic phase changes:

  • Freezing, when a liquid transforms to solid
  • Condensation, when a gas transforms to liquid

In endothermic phase changes, intermolecular binds are broken, requiring energy. This is the energy that is absorbed. In exothermic phase changes, molecules bind to each other in a formation that requires less energy. Therefore, this energy is expelled.

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Related Questions

  • Q:

    What is the term for gas changing to a solid?

    A:

    When a gas changes to a solid, the process is known as deposition. Deposition is one of several phase changes, which are the acts of matter going from one state to another.

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  • Q:

    Can a solid turn into a gas?

    A:

    A solid can turn directly into a gas through a process called sublimation. In this instance, the solid vaporizes without going through the intermediary liquid stage. For example, in the water cycle, this would involve snow or ice turning directly into water vapor without going through the melting process. The opposite process, in which vapor changes into ice, is known as deposition.

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  • Q:

    What is it called when a gas changes to a liquid?

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    Condensation is the scientific term used to describe matter that changes from a gas state into a liquid state. The most common example of condensation is steam collecting on the lid of a boiling pot of water.

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  • Q:

    What does "sublimation" mean in science?

    A:

    Sublimation is the scientific process in which solids are changed to gases without passing through the liquid phase. Sublimation occurs when temperatures and pressures are below the triple point. The triple point is the temperature and pressure at which substances can coexist in solid, liquid and vapor forms.

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