Why does the temperature not change during phase changes?

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Nicholas Appel 1F
Posts: 12
Joined: Wed Sep 21, 2016 2:59 pm

Why does the temperature not change during phase changes?

Postby Nicholas Appel 1F » Fri Jan 27, 2017 7:36 pm

I don't understand why the temperature of the given compound doesn't change during a phase change.
What is happening chemically to explain this?

stephanieyang_3F
Posts: 62
Joined: Wed Sep 21, 2016 2:55 pm

Re: Why does the temperature not change during phase changes?

Postby stephanieyang_3F » Fri Jan 27, 2017 8:19 pm

When we supply heat into a system, typically that heat is used to raise the temperature of that substance. (ex: we heat up water from 3.0 C -> 45.0 C). When a phase change occurs, the heat supplied into the reaction is used to break the intermolecular bonds of a substance instead of raising the temperature. It takes energy to break bonds, so since heat is a form of energy that can be transferred into/out of the system, heat can be used to break these bonds, and that is why the temperature does not change during a phase change. Hope I helped.

Nicholas Appel 1F
Posts: 12
Joined: Wed Sep 21, 2016 2:59 pm

Re: Why does the temperature not change during phase changes?

Postby Nicholas Appel 1F » Sat Jan 28, 2017 5:34 pm

Thanks!


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