Heat and Phase Transition

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Lorie Seuylemezian-2K
Posts: 62
Joined: Fri Sep 29, 2017 7:04 am

Heat and Phase Transition

Postby Lorie Seuylemezian-2K » Wed Jan 10, 2018 2:50 pm

Can someone explain how a sample's temp remains constant during phase transitions?

Matthew Lee 3L
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

Re: Heat and Phase Transition

Postby Matthew Lee 3L » Wed Jan 10, 2018 3:05 pm

According to zonalandeducation.com "During a change in state the heat energy is used to change the bonding between the molecules. In the case of melting, added energy is used to break the bonds between the molecules. In the case of freezing, energy is subtracted as the molecules bond to one another. These energy exchanges are not changes in kinetic energy. They are changes in bonding energy between the molecules."

Payton Schwesinger 1J
Posts: 45
Joined: Fri Sep 29, 2017 7:04 am

Re: Heat and Phase Transition

Postby Payton Schwesinger 1J » Wed Jan 10, 2018 3:15 pm

I believe that it is because during the phase change, all the heat added is being used to break the bonds between the molecules to convert them to a different state, and so the temperature of the substance will not begin to rise again until the phase change is complete. At the freezing or boiling point, the temperature will not rise again until the correct phase state has been reached.

Melodie Oh 2A
Posts: 22
Joined: Fri Sep 29, 2017 7:06 am

Re: Heat and Phase Transition

Postby Melodie Oh 2A » Wed Jan 10, 2018 4:28 pm

So basically, the temperature wouldn't change because that heat is required to change the phase. The temperature would stay constant until the phase transitions and then it would start changing its temperature if more heat is given/lost.


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