Phase changes

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Andrea_Torres
Posts: 98
Joined: Sun Sep 15, 2019 12:15 am

Phase changes

Postby Andrea_Torres » Sun Feb 02, 2020 8:52 pm

How do phase changes affect a reaction? How do they matter?

Nawal Dandachi 1G
Posts: 102
Joined: Sat Sep 28, 2019 12:16 am

Re: Phase changes

Postby Nawal Dandachi 1G » Sun Feb 02, 2020 8:55 pm

depending on whether breaking or forming bonds is occurring, you can determine if it's endo or exo.

J_CHEN 4I
Posts: 54
Joined: Tue Nov 14, 2017 3:01 am

Re: Phase changes

Postby J_CHEN 4I » Sun Feb 02, 2020 9:24 pm

Phase changes are relevant for problems that want the enthalpy. That is because the energy needed to be supplied for a phase change in a substance is different depending on the current phase of a substance. For example, the energy needed to change a liquid to a gas (the enthalpy of vaporization) is different from the needed to change a solid into a gas (the energy of sublimation).

Janet Nguy 2C
Posts: 115
Joined: Sat Aug 24, 2019 12:17 am

Re: Phase changes

Postby Janet Nguy 2C » Sun Feb 02, 2020 9:35 pm

You need to account for phase changes in enthalpy problems because the value will be different when the phase changes. This is why you need to calculate separately the enthalpy change from different phases and then add together the enthalpy change from the same phase reaction.


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