State functions

Abigail Menchaca_1H
Posts: 104
Joined: Sat Sep 07, 2019 12:19 am

State functions

What is the importance of state functions in a system?

KarineKim2L
Posts: 100
Joined: Fri Aug 30, 2019 12:16 am

Re: State functions

When something is a state function, the value of it does not depend on the pathway of the reaction. For example, since enthalpy is a state function, we do not have to worry about the intermediates of the reaction to find the change in enthalpy, but can simply find the change in enthalpy by viewing the reactants and the products.

Kaylee Sepulveda 4G
Posts: 100
Joined: Thu Jul 11, 2019 12:16 am

Re: State functions

State functions are properties whose value does not depend on the path taken to reach that specific value. Some examples are internal energy, enthalpy, and entropy. However, things like heat and work aren't state functions, because they depend on the path taken from the initial to the final values.

TarynD_1I
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: State functions

State functions can be added or subtracted, which allows us to calculate changes in values of the system

Juana Abana 1G
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

Re: State functions

Kaylee Sepulveda 4G wrote:State functions are properties whose value does not depend on the path taken to reach that specific value. Some examples are internal energy, enthalpy, and entropy. However, things like heat and work aren't state functions, because they depend on the path taken from the initial to the final values.

Work+and+heat+are+not+state+functions.jpg

Thank you this is very helpful.

Joanne Lee 1J
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: State functions

A state function is a property where the value does not depend on the path taken to reach that specific value. Therefore, state functions can be added or subtracted to find the answer.

Caroline Beecher 2H
Posts: 51
Joined: Wed Nov 14, 2018 12:21 am

Re: State functions

State functions and properties are important for use in thermochemistry problems because their value is determined by its current state and is not dependent on the path taken to obtain that state.

205291012
Posts: 50
Joined: Mon Nov 11, 2019 12:17 am

Re: State functions

State functions are important because the path taken to get to the final value does not matter. State functions only depend on the current state. So for enthalpy, you can start with ice and melt it and then cool it and then melt it again and the final enthalpy will still be the same. However, work would not be a state property because the path taken matters. Depending on the path taken, the value for work done can vary.
Think of taking two different paths (path A and path B) on a mountain from point X A to point Y. The final change in altitude will still be the same no matter what path you take. This is a state function. However, if path A is longer than path B, then work done in path A will be more. Therefore work done is not a state function as its value depends on the path taken.