Partial Pressures & Vapor Pressure: Crash Course Chemistry #15

This week we continue to spend quality time with gases, more deeply investigating some principles regarding pressure - including John Dalton's Law of Partial Pressures, vapor pressure - and demonstrating the method for collecting gas over water.

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

Table of Contents
Theory of the Atom 1:48
Adding up the Pressures 2:34
Mixing Vinegar & Baking Soda 7:15
Collecting Gas Over Water 8:54

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[crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! 

[rhymeswithorange]

My favorite thing about Hank is that he gets so excited about STUFF. He seems sometimes like that one kid in high school biology who loved learned about awesome stuff. That kid was always my favorite kid...He was also usually my best friend...

[Scerttle]

Michael's expression when Hank says "exactly about" XD

[michaeloyesiku]

For you to be able to explain Daltons law with such a level of simplicity, You're a GENIUS

[xGravitifyz]

Avogadro, Boyle, Charles and Dalton all came up with gas laws. ABCD. Coincidence? I think not.

[theCodyReeder]

I prefer to collect gas over mercury since its vapor pressure is about 1/8000th that of water.

[lucascampbell]

Don't you ever take a breath between sentences? Seriously though great stuff.

[jwilds]

Dear Hank,
Thank you so much! I have put off my AP Chem homework all summer because I've been busy all summer (Serving the homeless in MS for a month then a summer camp) So I was panicing, but you have managed to calm my nerves and help me! THANK YOU SO MUCH!

[Lemenks]

I am really impressed, I'll make sure to tell everyone I know who is learning chemistry (highschool of course) about these videos.
Teachers teach this every year, the same stuff again and again, so often that they give up caring (mostly). You on the other hand, make one only video and really pack it with a punch, brilliant for everybody learning this for the first time.
Honestly you are going to go down in history for one of the first people on youtube to aid equal learning opportunities for all

[kaylab]

The Cosmo Kramer painting on the wall in the background of the beginning animation made me smile :)

[Waterflame]

8:55 A wild Michael Aranda appears! I love Michael's face when Hank says "we have collected exactly... about..."

[oisforoctopus]

i really struggled with the equations but this really broke it down for me! thank you so much! :)

[julkarnainadnan]

Can you believe it was 10 year's ago and still that beautifully explained with animation !!

[alexbr]

Thank you very much Hank, your explanation rocks!
I'm currently using it in research form thin film deposition parameters.

[onthelongestroad]

I love how the friendship between Michael and Hank is so obvious. I can only imagine there were a lot of outtakes of hysterical laughter during those scenes!

[whitewolf]

Omg one of the forest spirits from Princess Mononoke was at the birthday party! That makes me so happy lol. Incredible video crash course, I learn so much from your channel, keep it up Hank!
-you too, lovely assistant who lives under the desk. Good job.

[kimeiga]

0:28 I'm not sure if that's how five-year-olds dance, Hank.

[XxSeparatexEntity]

Thank you SO MUCH for all the analogies and visuals!

[MattSarahJamSessions]

@Shara: R has different values depending on the units you are using. Because Joules and calories are different and atmospheres, Torr, and Hg are all different, the value of R that you should use when dealing with gas equations depends entirely on what units your data is in (or you want it to be in, and change it to through dimensional analysis). Hope that helped!

[becca]

These videos are fantastic!! Thank you so much!