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AP Chemistry 3.5 Laws of Thermodynamics 2 Views


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AP Chemistry 3.5 Laws of Thermodynamics. Which of the following is true regarding state functions?

Language:
English Language

Transcript

00:04

And here's your Shmoop du jour, brought to you by state functions, like the Pennsylvania [People eating pizza at the Pennsylvania pizza party '08]

00:09

Pizza Party of ’08.

00:12

All right, here's the question.

00:13

Which of the following is true regarding state functions?

00:16

And here are your potential answers.

00:23

So if a state function doesn't refer to when all of Ohio goes bowling together, then what [Men at a bowling alley]

00:28

is it?

00:29

Well in the context of thermodynamics, a state function refers to any property that depends

00:34

only on the current state of a system, and not on the path taken to get to that state.

00:39

Sort of like the relief you feel when you finally get back home to New York for Thanksgiving. [Man on a plane and the child seated behind crys]

00:44

Your flight may have been delayed three times, but at least you got there in time for the

00:47

turkey. [Family having thanksgiving dinner]

00:48

So that being said, we can immediately rule out choice B, which says that state functions

00:52

are dependent on path.

00:54

And, similarly, choice D must be incorrect because we now know that choice A is true.

00:59

So let’s check in with choice C.

01:01

Is temperature a state function? [Man walking through a desert]

01:03

Well, does the temperature of a system depend on the path we take to get to that temperature? [Man walks into a snowy, cold terrain]

01:09

No.

01:10

As far as we know, zero degrees Celsius is the same temperature regardless of whether

01:13

we start at a hotter or colder temperature, even though it might not feel like it. [Man standing in the snow]

01:17

Yeah, snow feels a lot colder when you’re coming right out of a Jacuzzi.

01:20

Though why you’d be doing that, we don’t know. [Man in a jacuzzi]

01:23

Anyway, temperature is a state function, so choice C is incorrect.

01:27

Meaning that choice A is the correct answer, regardless of how you came to that conclusion.

01:31

Well, except if you cheated. [Man reading a textbook]

01:32

Academic dishonesty is so wrong it makes everything wrong.

01:35

…Yeah.

01:36

There's logic in there somewhere.

01:37

Don't look too hard for it…

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