state functions

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Vuong_2F
Posts: 90
Joined: Sat Sep 14, 2019 12:17 am

state functions

Postby Vuong_2F » Sun Feb 02, 2020 11:39 pm

what’s a state function?

Long Luong 2H
Posts: 51
Joined: Thu Sep 19, 2019 12:16 am

Re: state functions

Postby Long Luong 2H » Sun Feb 02, 2020 11:47 pm

A state function is a property whose value is independent of the path taken to obtain the value. In other words, it doesn't matter how the particular value was achieved, but only as it exists in its current condition.

Karina Kong 2H
Posts: 98
Joined: Thu Jul 25, 2019 12:16 am

Re: state functions

Postby Karina Kong 2H » Sun Feb 02, 2020 11:52 pm

You can also add and subtract state functions.

Renee Grange 1I
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Joined: Fri Aug 30, 2019 12:16 am
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Re: state functions

Postby Renee Grange 1I » Sun Feb 02, 2020 11:54 pm

A state function is a value that doesn't depend on path taken to obtain that state and its value is determined by its current state.

Jasleen Kahlon
Posts: 52
Joined: Wed Nov 21, 2018 12:19 am

Re: state functions

Postby Jasleen Kahlon » Sun Feb 02, 2020 11:58 pm

A good example of state vs path functions is thinking of two points on a map, A and B, that are 100 km apart if you were to draw a straight line from one to the other. That 100km is representative of a state function. There are two roads to get from A to B, one road is 120km, the other is 180km. This is representative of a path function, as the distance from A to B by this would depend on which road (path) is taken.

005206171
Posts: 107
Joined: Wed Sep 18, 2019 12:20 am

Re: state functions

Postby 005206171 » Sun Feb 02, 2020 11:58 pm

State functions don't depend on the "path" they take. Usually they'll usually just involve the intial and final states. Some examples are enthalpy, temperature, density, volume, and pressure. Nonexamples have many parameters/variables in their equations because we have to consider them when calculating their values, meaning they don't depend on the path they take. Some nonexamples are work and heat.

zfinn
Posts: 106
Joined: Fri Aug 30, 2019 12:16 am

Re: state functions

Postby zfinn » Mon Feb 03, 2020 12:04 am

state functions only depend on the final value, not the way you got there. for example in a state function it wouldn't matter if you walked down bruinwalk or through the tennis courts to get to Lavelle's lecture, it only matters that you showed up at the lecture and that the lecture is your current location/state.

Deepika Reddy 1A
Posts: 125
Joined: Thu Jul 11, 2019 12:15 am

Re: state functions

Postby Deepika Reddy 1A » Mon Feb 03, 2020 12:27 am

State functions are when you only care about the initial and final values but the path taken to get to these values is not important.

Sanjana K - 2F
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Re: state functions

Postby Sanjana K - 2F » Mon Feb 03, 2020 2:16 am

Examples: energy, pressure, volume, temperature, density, heat capacity
Non-examples: work, heat

005384106
Posts: 101
Joined: Sat Aug 24, 2019 12:16 am

Re: state functions

Postby 005384106 » Tue Feb 04, 2020 9:28 pm

In 4B. 9 there is a situation where no energy is transferred as heat, what does this mean if delta U = work function?

Gurmukhi Bevli 4G
Posts: 49
Joined: Wed Nov 14, 2018 12:20 am

Re: state functions

Postby Gurmukhi Bevli 4G » Wed Feb 05, 2020 8:14 pm

State functions deal with the initial and final values of a system, but are not interested in the path taken by systems to reach those values.


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