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Isolated System

Posted: Mon Feb 12, 2018 2:57 pm
by Emily Glaser 1F
Is

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

in an isolated system?

Re: Isolated System

Posted: Mon Feb 12, 2018 4:32 pm
by Salman Azfar 1K
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.

Re: Isolated System

Posted: Thu Feb 15, 2018 5:30 pm
by Ramya Lakkaraju 1B
This fact that delta U = 0 allows us to set q = -w and do other calculations involving heat and work.

Re: Isolated System

Posted: Fri Feb 16, 2018 12:19 pm
by CalebBurns3L
Yes, since no energy or matter would be flowing in or out with all of those values set to 0.

Re: Isolated System

Posted: Sat Feb 17, 2018 12:49 am
by Kevin Tabibian 1A
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.

Re: Isolated System

Posted: Sat Feb 17, 2018 11:17 pm
by 204932558
Yes, as no heat or matter flows into the system or exits the system.