calculating a phase change in a reaction

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Liam Maxwell 2E
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

calculating a phase change in a reaction

Postby Liam Maxwell 2E » Sun Feb 11, 2018 8:17 pm

This is somewhat of a broad question that I am not entirely sure how to phrase correctly. In some instances with calculations involving reactions it is necessary to include when a solid or liquid changes to a gas if the product it forms is also a gas, but sometimes you don't. When do you know when to incorporate the phase change in the calculations?

Emily Mei 1B
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: calculating a phase change in a reaction

Postby Emily Mei 1B » Sun Feb 11, 2018 8:26 pm

If you're calculating heat, I think you're always supposed to include the phase change?

104922499 1F
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Re: calculating a phase change in a reaction

Postby 104922499 1F » Sun Feb 11, 2018 9:00 pm

I'm also confused on differentiating this problem

Jaewoo Jo 2L
Posts: 31
Joined: Fri Sep 29, 2017 7:06 am

Re: calculating a phase change in a reaction

Postby Jaewoo Jo 2L » Sun Feb 11, 2018 9:25 pm

I guess like the example seen on the practice midterm from the review session today, some questions will explicitly state that calculating a phase change is not required, while others will state that you are going from liquid to gas which implies that you need to include the phase change (although the example used today was from a solid to a liquid).

Vincent Kim 2I
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Joined: Fri Sep 29, 2017 7:04 am
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Re: calculating a phase change in a reaction

Postby Vincent Kim 2I » Sun Feb 11, 2018 11:24 pm

I think as a general rule if you're calculating heat you need to account for phase changes, but on the midterm things should be a little clearer.

Annie Lieu-1H
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Re: calculating a phase change in a reaction

Postby Annie Lieu-1H » Mon Mar 12, 2018 9:46 am

You should always account for phase changes for "calculating heat" problems because there's an energy change between phases we need to account for in the ultimate result.


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