state functions

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Clarice Chui 2C
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Joined: Fri Aug 30, 2019 12:16 am

state functions

Postby Clarice Chui 2C » Sun Mar 15, 2020 7:50 am

What are state functions and what are not state functions?

Eesha Chattopadhyay 2K
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Joined: Fri Aug 09, 2019 12:16 am

Re: state functions

Postby Eesha Chattopadhyay 2K » Sun Mar 15, 2020 7:52 am

State functions are functions that only consider the initial and final states, not the path that is taken to obtain those states. An example of a state property is displacement, whereas the non-state property would be the total distance traveled.

Ashley Wang 4G
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Re: state functions

Postby Ashley Wang 4G » Sun Mar 15, 2020 1:23 pm

For the properties we learned about in thermodynamics, Gibb's free energy, entropy, enthalpy, and internal energy are all state functions. Work and heat are path functions.

Emily Lo 1J
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Re: state functions

Postby Emily Lo 1J » Mon Mar 16, 2020 2:25 pm

State functions only depend on the initial and final products. Examples are entropy, enthalpy, and gibbs free energy.

Tauhid Islam- 1H
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Joined: Fri Aug 02, 2019 12:15 am

Re: state functions

Postby Tauhid Islam- 1H » Mon Mar 16, 2020 4:24 pm

This concept was heavily emphasized in thermodynamics, state functions are properties whose values do not depend on the path taken to reach that specific value whereas path functions are functions that depends on the path taken from two values. For state functions, you are only concerned over the final and initial values of the function.

ValerieChavarin 4F
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Re: state functions

Postby ValerieChavarin 4F » Mon Mar 16, 2020 4:49 pm

State functions, such as enthalpy, entropy, and Gibb's free energy, are dependent on the initial and final values. However, in the case of heat (q) and work which are pathway functions, the 'path' taken or how much is done is important.

Callum Guo 1H
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Re: state functions

Postby Callum Guo 1H » Mon Mar 16, 2020 5:52 pm

state functions are those that are not path-dependent. So the path it takes for it to get from it's intital to final state doesn't matter

Ayushi2011
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Joined: Wed Feb 27, 2019 12:17 am

Re: state functions

Postby Ayushi2011 » Mon Mar 16, 2020 6:13 pm

State functions are path-independent.

Charlene Datu 2E
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Joined: Wed Sep 11, 2019 12:16 am

Re: state functions

Postby Charlene Datu 2E » Mon Mar 16, 2020 7:32 pm

State functions are an intrinsic value that do not depend on the path taken to obtain, only on the current state.
State functions: gibb's(G), enthalpy (H), entropy (S), heat capacity, pressure, volume, density
Not state functions: work (w), heat (q)

Owen-Koetters-4I
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Joined: Fri Sep 28, 2018 12:16 am

Re: state functions

Postby Owen-Koetters-4I » Mon Mar 16, 2020 8:13 pm

State functions are independent of the path taken. Gibbs energy (G), enthalpy (H), entropy (S), heat capacity, pressure, volume, and density are all examples. Work (w) and heat (q) are not state functions.

My-Lan Le 1L
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Joined: Thu Dec 17, 2020 12:19 am

Re: state functions

Postby My-Lan Le 1L » Wed Jan 20, 2021 12:38 pm

State functions only include the final and initial states into consideration, so the "path taken" to get there is not taken into consideration. So, as mentioned in lecture, examples of state functions are Gibb's Free Energy (G), enthalpy (H), entropy (S) and heat capacity, and variables that are not state functions are work (w) and heat (q). One thing to be careful of is heat. If there is not much information being given about heat and if it does not give information about how heat is calculated, it might not be a state function since heat can be in both categories.

DMaya_2G
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Joined: Wed Sep 30, 2020 9:58 pm

Re: state functions

Postby DMaya_2G » Wed Jan 20, 2021 12:46 pm

State functions are for example, entropy, enthalpy, and Gibb's free energy, which they are dependent on the initial and final values.

Norah Gidanian 3D
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Re: state functions

Postby Norah Gidanian 3D » Wed Jan 20, 2021 12:47 pm

State functions are things that do not depend on the path that they take. You just need to know the beginning and ending numbers. For example change in temperature, density, and volume. Work is not a state function because in order to calculate work you need to know the direct path it took and all of the ups and downs it goes through before getting to the ending part

OwenSumter_2F
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Re: state functions

Postby OwenSumter_2F » Wed Jan 20, 2021 1:20 pm

An example would be to go from New York City to Los Angeles would be around 2,800 miles but if you were to take that trip it would most likely be more as you would not be able to go in a directly straight line. That first number (2,800) is a state function, but the actual miles you went would not be.


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