Isolated System


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Emily Glaser 1F
Posts: 156
Joined: Thu Jul 27, 2017 3:01 am

Isolated System

Postby Emily Glaser 1F » Mon Feb 12, 2018 2:57 pm

Is

delta U=0
q=0
w=0
delta H=0

in an isolated system?

Salman Azfar 1K
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Isolated System

Postby Salman Azfar 1K » Mon Feb 12, 2018 4:32 pm

An isolated system means no energy or matter can flow in or out, so often that will be the case. So yea, in isolated systems w and q will both be zero and delta U is zero.

Ramya Lakkaraju 1B
Posts: 67
Joined: Fri Sep 29, 2017 7:03 am

Re: Isolated System

Postby Ramya Lakkaraju 1B » Thu Feb 15, 2018 5:30 pm

This fact that delta U = 0 allows us to set q = -w and do other calculations involving heat and work.

CalebBurns3L
Posts: 47
Joined: Fri Sep 29, 2017 7:07 am

Re: Isolated System

Postby CalebBurns3L » Fri Feb 16, 2018 12:19 pm

Yes, since no energy or matter would be flowing in or out with all of those values set to 0.

Kevin Tabibian 1A
Posts: 42
Joined: Fri Sep 29, 2017 7:06 am

Re: Isolated System

Postby Kevin Tabibian 1A » Sat Feb 17, 2018 12:49 am

Yes, but be careful determining whether a question is asking for the change in energy of the system or a reaction within the system. Because all those terms could very well not be equal to zero for to a reaction within an ideal bomb calorimeter. But the total energy of the bomb calorimeter will be unchanged.

204932558
Posts: 23
Joined: Fri Sep 29, 2017 7:05 am

Re: Isolated System

Postby 204932558 » Sat Feb 17, 2018 11:17 pm

Yes, as no heat or matter flows into the system or exits the system.


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