Phase changes

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Phase changes

Postby Blake_Katsev_2E » Wed Feb 08, 2017 12:13 pm

When going from a gas to a liquid is deltaH positive or negative and why?

Joyce Wu 3E
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Re: Phase changes

Postby Joyce Wu 3E » Wed Feb 08, 2017 12:17 pm

Usually when Gas goes to a Liquid, deltaH is a negative. Forming bonds releases energy. In contrast, when Liquid goes to a Gas, deltaH is a positive since it requires energy to break the intermolecular bonds.

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