Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ
Technically yes, and no. On the periodic table you can find the Relative Atom Mass in amu. You can convert this into a Mole by simply replacing the amu with kilograms.
***** We do represent Molar mass as g/mol more generally but there is a slightly differently drawn M that also represents molar mass. In general, M does mean molarity though.
Very good one, Hank! In an entire undergraduate program I dealt very little with effusion. Thanks for filling in my gaps; it's so relevant to real life!
These videos are literally the only reason I passed the AP chem test four years ago, and they're also the reason why I'm at the top of my class in college Chemistry.
I noticed Mike Wasowski in one of the lockers of the animated school hallways (for those reading the comment section, he was in the lockers towards the right of the screen). But the science was cool too.
Science, with added Niall... My favourite subject with a dash of my favourite Irishman, not complaining! Haha I'm actually loving this chemistry course, it's so much more understandable than I've even taught in the past!
What in the world??? @ 8:54 it says "NH3 + HCl3 ---> NH4Cl(s)" I know this is a mistake because Hank says Hydrochloric acid, the container is labeled HCl, and the above equation is not balanced.
Hank forgot to finish the problem at 6:45. The original question asked how LONG it will take for 1 L of Cl2 to effuse under identical conditions. Since the rate of effusion for Cl2 is 0.052L/min, it will take 19.23 minutes for 1 L of Cl2 to effuse.
i'm a chemistry undergraduate and this has always baffled me. a lot of chemistry baffles me. i don't think i'll ever lose this sensation, chemistry is just a baffling subject.
My nephew once found an Easter Egg about two weeks BEFORE Easter. It had been in the back yard about 50 weeks. It wasn't to bad until he broke the egg.
so now the quandary is... should I watch these here, where it's nice and safe and clean and playlisted, or should I watch these on khanacademy, where I will get points, but effort.
In the chemical equation for the reaction of ammonia and hydrogen chloride (8:56) it should probably say NH3(g) + HCl(g) -> NH4Cl(s) instead of NH3(g) + HCl3(g) -> NH4Cl(s). (subscript 3 on Cl in HCl3 is probably a mistake)
Alternatively, Velocity uses a lowercase v, and Volume uses an uppercase V. Compare 3:54 with 5:15. As my physics professors always said, your notation doesn't really matter as long as you're consistent. Plank's constant could be 我 or Й, as long as one is consistent.
Mistakes 1. "The velocity is proportional to the square root of the mass" -04:25( I think it should be inversely proportional) 2. "HCl3" -08:59( It should be HCl)
Flatus (fart gas) contains many different gases. The smelly portion of that gas is Methanethiol. Different farts have different amounts of this gas, as well as other gases that can make some worse than others.
I don't think Hank or John know... too much about the principles of physics. Explaining something you don't know, or just learned isn't really too easy. I'd love to see it, but... only if it is something they enjoy. No forcing.
Effusion is the process of individual molecules escaping through a small hole without bumping in to other molecules. Moving down a concentration gradient is when molecules are packed together densely and they just want to get a little bit more "elbow room," like Hank said. Both effusion and diffusion can be qualified as moving down a concentration gradient though... (at least i think so.)
My guess would be that lower temperature gives slower diffusion. And when gases condense, they're essentially "removed" from the gas concentration, since they're way more tightly packed as liquids or solids. This means more gas eventually goes near the condenced particles, which tend to be cooler (oh yeah ;D), and thus makes more particles condence! Cue water on (cool) glasses when going inside from cold weather.
Or above, since it's very often a vector. Also, volume is capital V, while velocity is lower-case v. When writing physics, capitalisation matters VERY much: it's the difference between volume and velocity, between yocto-joules and yotta-joules...
I stopped watching Hanks vids a while ago because I didnt like the way he presented..But this is Waaayy better then it used to be. Time to backtrack :D
This would have been an amazing series if it was around when I was in Chem AP. Actually... youtube would have been amazing if it was around when I was in Chem AP....
Hank, thanks for the videos! But two questions. When is Crash Course Physics going to come, and when is the lab safety episode? After all, lab safety has been referenced at least once and is in the intro.
between 4:00 and 4:20 it could be made a little clearer that kinetic energy is inversely proportional to sqrt(m), and not m. The combination of the square root sign not going all the way down, Hank's voice over for the equation and the description afterwards all make it a little ambiguous. Great stuff as always, just nit picking.
Crash Course is lying to you! The eggs aren't actually rotten! They would have a grayish discoloration which they clearly do not in the video #insidejob
allright, i will not group them all together but the ones i know truly know nothing about music, not about how to write and read it, not about it's history (they didn't know who madeus mozart was), nor about instruments (they didn't know what a trombone was), etc, etc.
Why not apply a bit of what Hank taught us in this video? Simply plug the molar mass of hydrogen sulphide gas (the primary "bad smell" of a fart, H2S, appx. 34 g/mol) and the molar mass of air (appx. 78:21:1 N2:O2:Ar, appx. 29 g/mol) into Graham's Effusion Equation. Note: results will vary based on altitude, humidity, and H2S concentration of the fart (methanethiol can contribute to a fart's putridity, but is usually present in very low concentrations). Science FTW!
Why on Earth do they refer to HCl as hydrochloric acid? It isn't, it is hydrogen chloride, and as someone else commented, at 8:54 they use the wrong formula, despite having he correct formula on the plastic dishes used in the experiment. Still, this is, as usual, a very good video. They must take a heck of a lot of effort. I want those models sitting on the desk. :D
Do you have any crash courses in mathematics? I used to love math...until junior high...when I had a math teacher that acted alot like Snape, a science teacher obsessed with mushrooms, and that's not even going into the english teacher who knoew less english than me, and the other teacher who thought telling a bunch of teenager to do whatever they wanted as long as they didn't disturb those who wanted to learn. >> So, yeah... I really could use a good basic course in math covering junior high and high school math, and I bet alot of other people had much the same problem. (Tho maybe for different reasons.) And finding a free GOOD math course online seems nearly impossible. >> Plus, I love the chemistry teacher here, despite his speed-spech, and the way to make everything come to live in CrashCourse, so...
Now you say gases spread out away from each other until they dispersed evenly through an available space. By moving from a higher to lower concentration. What about during condensation, when cool to do gases still move apart, as the liquify, or do they come together? Basically I am asking how temperature effects diffusion.
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/2SrDulJ
k
Thanks again Hank, your the only reason I'm getting through my high school chemistry with a 95%
+Kelan Sparks Did you fail English?
you + are = your
Awesome!
Remember kids, v = velocity, V = Volume, m = mass, and M = Molar Mass and you can find the Molar Mass of any atom on the periodic table. :)
Thanks mom
Technically yes, and no. On the periodic table you can find the Relative Atom Mass in amu. You can convert this into a Mole by simply replacing the amu with kilograms.
M is also molarity, kill us all.
***** We do represent Molar mass as g/mol more generally but there is a slightly differently drawn M that also represents molar mass. In general, M does mean molarity though.
+UnforsakenXII I have seen that molarity is an italicized M... :3
PLEASE TEACH AT THE UNIVERSITY OF FLORIDA. We need you so much! Im passing but Id much rather pay to be taught not pay to teach myself!
Very good one, Hank! In an entire undergraduate program I dealt very little with effusion. Thanks for filling in my gaps; it's so relevant to real life!
These videos are literally the only reason I passed the AP chem test four years ago, and they're also the reason why I'm at the top of my class in college Chemistry.
Finally noticed Hanks tick. Left hand is constantly correcting his glasses, even though they aren't sliding off.
My brain gets all smug when Hank tells me all the things I've learned in each episode;)
i like your name
Getting almost an A+ in AP Chemistry.
I love you Hank.
I noticed Mike Wasowski in one of the lockers of the animated school hallways (for those reading the comment section, he was in the lockers towards the right of the screen). But the science was cool too.
Oh thanks. LOL
Science, with added Niall... My favourite subject with a dash of my favourite Irishman, not complaining! Haha I'm actually loving this chemistry course, it's so much more understandable than I've even taught in the past!
What in the world??? @ 8:54 it says "NH3 + HCl3 ---> NH4Cl(s)" I know this is a mistake because Hank says Hydrochloric acid, the container is labeled HCl, and the above equation is not balanced.
i appreciate the Pokemon reference. Good video. :]
Hank forgot to finish the problem at 6:45. The original question asked how LONG it will take for 1 L of Cl2 to effuse under identical conditions. Since the rate of effusion for Cl2 is 0.052L/min, it will take 19.23 minutes for 1 L of Cl2 to effuse.
i'm a chemistry undergraduate and this has always baffled me. a lot of chemistry baffles me.
i don't think i'll ever lose this sensation, chemistry is just a baffling subject.
As you might have GASSED
Just no
wow 1d is everywhere
I LOVE how you used koffing!
@nicole peterson Yeah no Pokemon are the WORST!
Magic School Bus + Hank Green = everything beautiful in the world of science
As you might have GASSED,
Crash course videos are EGGcellent!!
P.S.HANK U R THE BEST!!
+
This is the first video I could actually apply my years of Biology education to. Yay.
8.56 : It's HCL not HCL3
This video instantly won when Koffing and a Pokeball were used to illustrate an example.
My nephew once found an Easter Egg about two weeks BEFORE Easter. It had been in the back yard about 50 weeks. It wasn't to bad until he broke the egg.
so now the quandary is...
should I watch these here, where it's nice and safe and clean and playlisted, or should I watch these on khanacademy, where I will get points, but effort.
In the chemical equation for the reaction of ammonia and hydrogen chloride (8:56) it should probably say NH3(g) + HCl(g) -> NH4Cl(s) instead of NH3(g) + HCl3(g) -> NH4Cl(s). (subscript 3 on Cl in HCl3 is probably a mistake)
MathHacker42 *hydrochloric acid
Watching crash course is how I am spending my summer. I know, I'm awesome.
As far as we need this is the old AP Chem Course
Got say this made a lot more sense then the 2 min we covered this in Chem class.
I am only 11 and I love watching this show
Good luck for the future to become the next Walter White.
Don't be proud of u'r self.😐😐😐i'm 1 year younger then u and i'm a chemistry Goddess.💝
+sana aliminati
me too! I thought I was the only one! I don't have to feel lonely now!
+sana aliminati calm down small ones
+Yasmina Katebi though i did not meant to offend u.
Cheers.
"That's one of the cool things about science, it always ends up making sense once you know what you're looking for."
Best.Quote.Ever
When he said, not the hatness, I looked up and was like NIALL OMG lol
Ikr
Me too!😂
Alternatively, Velocity uses a lowercase v, and Volume uses an uppercase V. Compare 3:54 with 5:15. As my physics professors always said, your notation doesn't really matter as long as you're consistent. Plank's constant could be 我 or Й, as long as one is consistent.
1:38 Reference. you just earned a sub
Excellent sir I understood now thanks
Mistakes
1. "The velocity is proportional to the square root of the mass" -04:25( I think it should be inversely proportional)
2. "HCl3" -08:59( It should be HCl)
I can't fully see Hank's shirt, but I can tell that it's awesome.
Hank, we are usually concerned with root mean square in thermodynamics, not statistical mean. They are distinctly different.
Perhaps future students will find it even more handy to have the complete series.
I love how Hank tried to do John's "chair slide" Crash Course intro at the beginning...
Flatus (fart gas) contains many different gases. The smelly portion of that gas is Methanethiol. Different farts have different amounts of this gas, as well as other gases that can make some worse than others.
Awesome experiment! MORE MORE MORE!
pokemon refrences r the best refrences
The Tryhard Koffing is not a gas, essentially. Maybe Gastly would have been a better choice.
Agreed
But 1d references are the worst!
That is, in my opinion
Koffing and Weezing represent air pollution.
I don't think Hank or John know... too much about the principles of physics. Explaining something you don't know, or just learned isn't really too easy. I'd love to see it, but... only if it is something they enjoy. No forcing.
its just cool getting here earlier than you normally get
I loved the use of Koffing at the beginning :D
Effusion is the process of individual molecules escaping through a small hole without bumping in to other molecules. Moving down a concentration gradient is when molecules are packed together densely and they just want to get a little bit more "elbow room," like Hank said. Both effusion and diffusion can be qualified as moving down a concentration gradient though... (at least i think so.)
Cooooool!!!!! I loved the Koffing!!!
using crash course to "study" for my chem final this semester. Not my best idea. Don't care. The textbook sucks.
DaedricSheep How'd your final go?
Erik This was for first semester, so pretty well. Final took me from a C to a B so i'm all for that shit (._.)b
I'm using it to study for a quiz..... I had to miss the day my teacher taught that lesson. :/
i'm not ashamed to say i watched this only to find out where niall came into this and i can't say i was disspointed ily hank
My guess would be that lower temperature gives slower diffusion.
And when gases condense, they're essentially "removed" from the gas concentration, since they're way more tightly packed as liquids or solids.
This means more gas eventually goes near the condenced particles, which tend to be cooler (oh yeah ;D), and thus makes more particles condence!
Cue water on (cool) glasses when going inside from cold weather.
Yay, next episode is out!
I LOVE NIALL HORAN, WITH HIS BLUE EYES AND BLONDE HAIR HE MAKE ME DO DIS💁♀️
omfg, I laughed when Hank said One Direction, then he used NIall !! as an analogy for hottness !! yasss !
Love the Koffing!!!
Excellent use of a Koffing, Crash Course.
I hit the Like button as soon as I saw Koffing.
Or above, since it's very often a vector. Also, volume is capital V, while velocity is lower-case v. When writing physics, capitalisation matters VERY much: it's the difference between volume and velocity, between yocto-joules and yotta-joules...
the examples help soooooo much
Please, hank, Crash Course physics. You know it's the right thing to do. Especially considering the nuke poised over the David Tennant's house.
So much better than... my chemistry homework.
I stopped watching Hanks vids a while ago because I didnt like the way he presented..But this is Waaayy better then it used to be. Time to backtrack :D
Please please please do a chemistry episode about salt!
I finally get the HCl + NH3 in the tube experiment... 1 year later. Thanks crashcourse team. :)
well these are a great review for my first year of college chemistry.
Anyone notice Hank's shirt?
Nice references btw.
never knew that last experiment, it's very cool
If you think that's bad, you should consider the greek letter rho. I can think of 6 different ways it's used in physics just off the top of my head.
I think you should do one on use of energy to change temp. since you keep referring to temp. as the change in kinetic energy
Koffing was in this video, AND THERE WAS MUCH REJOICEMENT! *yay*.
This would have been an amazing series if it was around when I was in Chem AP. Actually... youtube would have been amazing if it was around when I was in Chem AP....
Very nice explainaion
Sweet you made a Kaze no Kizu (wind scar) at 09:07 :)
- Heidi
Life saver.
I am really hoping there will one day be a crash course or scishow category on physics (or branches of it, fluid dynamics would be fun)
Hank, thanks for the videos!
But two questions. When is Crash Course Physics going to come, and when is the lab safety episode? After all, lab safety has been referenced at least once and is in the intro.
between 4:00 and 4:20 it could be made a little clearer that kinetic energy is inversely proportional to sqrt(m), and not m. The combination of the square root sign not going all the way down, Hank's voice over for the equation and the description afterwards all make it a little ambiguous.
Great stuff as always, just nit picking.
Crash Course is lying to you! The eggs aren't actually rotten! They would have a grayish discoloration which they clearly do not in the video #insidejob
You don't realise that it's against Animal Rights to spoil their eggs? You're so cruel!!
+Joshua Lansell-Kenny You do realize that you're wrong right?
Marilyn Richie ikr must have been Hank's gas XDDDD
allright, i will not group them all together but the ones i know truly know nothing about music, not about how to write and read it, not about it's history (they didn't know who madeus mozart was), nor about instruments (they didn't know what a trombone was), etc, etc.
Was no one else freaking out when they threw out a koffing?
Go! Koffing!
awesome hank we love your videos
Have you guys considered making the crash course series available on DVD? As a teacher with sometimes unreliable internet, I would be interested.
Passing gas!
Mike was in the locker!! Monsters U!
This is all very handy, but my chemistry exam was yesterday.
Thanks for making me understand diffusion, effusion and the velocity of a gas:):):):)
velocity is actually displacement divided by change in time. Speed is total distance divided by change in time
The airspeed velocity of an unladen European Swallow is roughly 11 meters per second, or 24 miles per hour
Why not apply a bit of what Hank taught us in this video? Simply plug the molar mass of hydrogen sulphide gas (the primary "bad smell" of a fart, H2S, appx. 34 g/mol) and the molar mass of air (appx. 78:21:1 N2:O2:Ar, appx. 29 g/mol) into Graham's Effusion Equation.
Note: results will vary based on altitude, humidity, and H2S concentration of the fart (methanethiol can contribute to a fart's putridity, but is usually present in very low concentrations).
Science FTW!
I had to google that Nial dude because I had no idea who the hell he was. I now wish I hadn't. Damn you Hank!
1, kickin' shirt there Hank.
2, How do you avoid copyrights with how much stuff you guys slip in there?
OMG I love you soooo much!!! If it weren't for you I would not be passing Chemistry. :D
"That smell is coming from the eggs isn't it.."
Lmao oh John
Why on Earth do they refer to HCl as hydrochloric acid? It isn't, it is hydrogen chloride, and as someone else commented, at 8:54 they use the wrong formula, despite having he correct formula on the plastic dishes used in the experiment.
Still, this is, as usual, a very good video. They must take a heck of a lot of effort.
I want those models sitting on the desk. :D
Do you have any crash courses in mathematics?
I used to love math...until junior high...when I had a math teacher that acted alot like Snape, a science teacher obsessed with mushrooms, and that's not even going into the english teacher who knoew less english than me, and the other teacher who thought telling a bunch of teenager to do whatever they wanted as long as they didn't disturb those who wanted to learn. >>
So, yeah... I really could use a good basic course in math covering junior high and high school math, and I bet alot of other people had much the same problem. (Tho maybe for different reasons.) And finding a free GOOD math course online seems nearly impossible. >>
Plus, I love the chemistry teacher here, despite his speed-spech, and the way to make everything come to live in CrashCourse, so...
Excellent video!
Effusion, diffusion and confusion
WEEZING!!
Now you say gases spread out away from each other until they dispersed evenly through an available space. By moving from a higher to lower concentration. What about during condensation, when cool to do gases still move apart, as the liquify, or do they come together? Basically I am asking how temperature effects diffusion.