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 16, 2020 7:26 pm

How do we determine when there has been a phase change?

Ariana Iranmahboub1G
Posts: 114
Joined: Fri Aug 09, 2019 12:17 am

Re: Phase changes

Postby Ariana Iranmahboub1G » Sun Feb 16, 2020 7:29 pm

If the substance reaches its boiling point, melting point, or freezing point, that makes it clear the substance undergoes a phase change. In other instances, sometimes the problem will tell us that the substance, melted, froze, or evaporated.

Daniel Honeychurch1C
Posts: 109
Joined: Thu Jul 11, 2019 12:15 am

Re: Phase changes

Postby Daniel Honeychurch1C » Sun Feb 16, 2020 7:30 pm

If the temperature changes beyond the vaporization/melting point (ex. from 70 C to 110 C for water) then a phase change occurred.

Alondra
Posts: 36
Joined: Tue Feb 26, 2019 12:15 am

Re: Phase changes

Postby Alondra » Sun Feb 16, 2020 7:36 pm

When the substance reaches it’s melting/ boiling/ freezing point. Drawing the heating curve for water at least can be helpful.

Areli C 1L
Posts: 95
Joined: Wed Nov 14, 2018 12:19 am

Re: Phase changes

Postby Areli C 1L » Sun Feb 16, 2020 8:13 pm

I feel like usually, the problem would tell us the type of system it is along with the changes that have occurred: Melting, boiling, vaporizing, etc.

sarahartzell1A
Posts: 56
Joined: Fri Sep 28, 2018 12:17 am

Re: Phase changes

Postby sarahartzell1A » Sun Feb 16, 2020 8:17 pm

Usually when the boiling, melting, or freezing point has been reached.

Natalie Benitez 1E
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

Re: Phase changes

Postby Natalie Benitez 1E » Mon Feb 17, 2020 2:18 pm

What calculation do we also have to incorporate when going from a gas to a liquid or vice versa?

WGaines_2E
Posts: 47
Joined: Mon Nov 18, 2019 12:18 am

Re: Phase changes

Postby WGaines_2E » Tue Mar 10, 2020 8:34 pm

you know if there is a phase change if in the reaction the molecule at focus has gone from a liquid to a solid or gas, etc

jisulee1C
Posts: 149
Joined: Thu Jul 25, 2019 12:17 am

Re: Phase changes

Postby jisulee1C » Tue Mar 10, 2020 8:44 pm

Natalie Benitez 1E wrote:What calculation do we also have to incorporate when going from a gas to a liquid or vice versa?


When calculating q for the reaction you can use the phase change graph and calculate the different q for both the heating and the phase change to calculate the q for the phase change from liquid to gas or the heat that would be released when going from gas to liquid.


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