State functions?






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Rachel Wang
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

State functions?

Postby Rachel Wang » Fri Mar 16, 2018 6:15 pm

What is an example of a state function?

Is enthalpy or entropy a state function?

Jonathan Tangonan 1E
Posts: 50
Joined: Sat Jul 22, 2017 3:01 am

Re: State functions?

Postby Jonathan Tangonan 1E » Fri Mar 16, 2018 6:20 pm

Enthalpy and entropy are both state functions.

Ishan Saha 1L
Posts: 60
Joined: Fri Sep 29, 2017 7:03 am

Re: State functions?

Postby Ishan Saha 1L » Fri Mar 16, 2018 6:20 pm

Yes entropy, enthalpy and Gibb's free energy are all examples of state functions in that they do not depend on the pathway, and instead only rely on the initial and final values. It is important to note that Cell potential (E) is NOT a state function, so if we need to add the values together, we need to convert to G, add the G's together and then convert back to E.

Rishi Khettry 1L
Posts: 29
Joined: Fri Sep 29, 2017 7:05 am

Re: State functions?

Postby Rishi Khettry 1L » Fri Mar 16, 2018 7:14 pm

It is important to know the difference between state functions and those that aren't state functions. Entropy and enthalpy are state functions while heat and work are not.

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

Re: State functions?

Postby 204932558 » Fri Mar 16, 2018 8:03 pm

They are both state functions. Gibbs free energy is another example.

Clarissa Molina 1D
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Re: State functions?

Postby Clarissa Molina 1D » Fri Mar 16, 2018 11:11 pm

Why are heat and work not state functions?

melissa carey 1f
Posts: 53
Joined: Fri Sep 29, 2017 7:06 am

Re: State functions?

Postby melissa carey 1f » Sat Mar 17, 2018 11:53 am

Clarissa Molina 1D wrote:Why are heat and work not state functions?


G H and S are all quantities of energy (in the form of heat or disorder) contained within a compound. Work and heat are CHANGES in energy. How you change energy depends on the PATH.

your altitude on a mountain = state function = G H S
how you got to the top (path) = path dependent = W and q

Cynthia Bui 2H
Posts: 30
Joined: Fri Sep 29, 2017 7:05 am

Re: State functions?

Postby Cynthia Bui 2H » Sat Mar 17, 2018 5:16 pm

They're both state functions. Because of that you can add their quantities together to get a total or final entropy or enthalpy.

Troy Tavangar 1I
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: State functions?

Postby Troy Tavangar 1I » Sat Mar 17, 2018 5:18 pm

Both are classified as state functions. Gibbs Free Energy is also a state function.

DamianW
Posts: 35
Joined: Fri Sep 29, 2017 7:06 am

Re: State functions?

Postby DamianW » Sun Mar 18, 2018 8:34 pm

why is U one?


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