Phase change problems

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Netpheel Wang 4L
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Phase change problems

Postby Netpheel Wang 4L » Mon Feb 04, 2019 12:17 pm

How do you account for phase changes in calculations?

Laura Gong 3H
Posts: 89
Joined: Fri Sep 28, 2018 12:26 am
Been upvoted: 1 time

Re: Phase change problems

Postby Laura Gong 3H » Mon Feb 04, 2019 2:43 pm

During phase changes, the temperature does not changem so instead of using the equation q=mCdeltaT, use q=ndeltaHfus or q=ndeltaHvap depending on which phase change.

Chloe Thorpe 1J
Posts: 77
Joined: Fri Sep 28, 2018 12:16 am

Re: Phase change problems

Postby Chloe Thorpe 1J » Mon Feb 04, 2019 4:22 pm

My TA said that it helps to draw out the graph that Lavelle had on the slides showing why steam causes more severe burns than water at the same temperature. When the graph is diagonal, you use the specific heat of the compound. When it is horizontal, you use latent heat in the calculation.

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