Phase Changes

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Selena Yu 1H
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Joined: Fri Aug 09, 2019 12:16 am
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Phase Changes

Postby Selena Yu 1H » Fri Jan 24, 2020 1:31 am

Are there any phase changes from vapor --> liquid, liquid --> solid, or vapor --> solid? Are these changes just the exothermic process of the ones we talked about in class?

Sean Cheah 1E
Posts: 105
Joined: Wed Sep 18, 2019 12:20 am

Re: Phase Changes

Postby Sean Cheah 1E » Fri Jan 24, 2020 9:07 am

The names for the phase changes you listed are, in order, condensation, freezing, and deposition. These are indeed simply the reverse of vaporization, melting, and sublimation, respectively, and are therefore exothermic.

Posts: 51
Joined: Mon Nov 18, 2019 12:18 am

Re: Phase Changes

Postby smurphy1D » Fri Jan 24, 2020 10:08 am

For all phase change equations, do we always subtract the end phase by the beginning phase stat, just like we would do in equilibrium equations?

Wilson 2E
Posts: 100
Joined: Sat Aug 17, 2019 12:18 am

Re: Phase Changes

Postby Wilson 2E » Sat Jan 25, 2020 1:56 pm

Yes, it's just the change in heat between the final and initial states. The deltaH between states will be the same, only the sign will be different (e.g. solid -> liquid deltaH = 50, liquid -> solid deltaH = -50)

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