State Functions

$\Delta U=q+w$

Jielena_Bragasin2G
Posts: 104
Joined: Sat Aug 24, 2019 12:18 am
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State Functions

Why is internal energy not a state function while heat and work are state functions? I thought initial energy would also be a state function since: State function = work + heat.

sbeall_1C
Posts: 109
Joined: Sat Sep 07, 2019 12:17 am
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Re: State Functions

Heat and work are not state functions, but enthalpy is a state function!

Venus_Hagan 2L
Posts: 104
Joined: Fri Aug 02, 2019 12:16 am

Re: State Functions

Heat and work are not state functions. The path/steps that are taken to get the value matter.

vpena_1I
Posts: 109
Joined: Sat Aug 24, 2019 12:15 am

Re: State Functions

I think you meant it the other way around. Internal energy is a state function, while work and heat are not. The reason being, at least the way I think of it, is that an object can store internal energy. An object cannot, however, store work or heat. Work and heat is the process of internal energy being transferred from the system to its surroundings.

Nick Lewis 4F
Posts: 111
Joined: Wed Sep 18, 2019 12:18 am

Re: State Functions

What does it mean to be an "internal system"? What is the distinction between types of systems?