## PRACTICE QUIZ 1 (#9)

isochoric/isometric: $\Delta V = 0$
isothermal: $\Delta T = 0$
isobaric: $\Delta P = 0$

Justin_Ching_3I
Posts: 7
Joined: Wed Sep 21, 2016 2:55 pm

### PRACTICE QUIZ 1 (#9)

The answer for the question is ΔG and ΔSsys, but I was wondering how come it wouldn't be ΔSsys and ΔSsur as well? Won't they both be 0 because it is isothermal and there is no change?

Britney Pheng 1L
Posts: 22
Joined: Wed Sep 21, 2016 2:56 pm
Been upvoted: 1 time

### Re: PRACTICE QUIZ 1 (#9)

Hi!
My TA explained that entropy in the entire universe is always increasing, and ΔSsurr would have to take that into account.

Winnie Liu 1M
Posts: 11
Joined: Fri Jul 15, 2016 3:00 am

### Re: PRACTICE QUIZ 1 (#9)

Adding on, The Second Law of Thermodynamics states that the state of entropy of the entire universe as an isolated system will always increase over time! While we can know that delta G is 0 because it's a state function and we have identical initial/final states inside our system, the delta S of the universe does not have identical states.