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.
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.
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!
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.
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.
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'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.
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!
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.
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.
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)
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.
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
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)
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.
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.)
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...
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.
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.
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
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.
4:12 Well no. The mass is inversly proportional to the square of the velocity and thus the velocity is inversly proportional to the squareroot of the mass.
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.
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.
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.
Rotten eggs produce hydrogen sulfide. What kind of gas do humans produce? 2:07 Net Velocity vs Average Velocity. Definitions. 3:12 Tempture. An expression of the average kinetic energy of particles in a system. Why heat burns speed of particles. The faster the speed the more energy. 3:58 The formula for kinetic energy. The cool thing about science is that it always makes sense. The uncool thing about religion is that it rarely makes sense. 10:25 Summary!
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....
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!
Yup, burns are just increased molecular motions of our cells to the point of damage. Nociceptors are nerve cells that pick up this damage and report it to our brains as pain. Combustion doesn´t occur because the activation energy to reach combustion is too high for the molecules in our body compared to say paper.
So... Maybe I'm not smart enough to understand ALL of it because I'm actually going to the 8th grade.... But can someone explain to me what "mv" is and means?
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...
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
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
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!
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!
Finally noticed Hanks tick. Left hand is constantly correcting his glasses, even though they aren't sliding off.
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.
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!
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
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.
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'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.
i appreciate the Pokemon reference. Good video. :]
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!
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. :/
Magic School Bus + Hank Green = everything beautiful in the world of science
I LOVE how you used koffing!
@nicole peterson Yeah no Pokemon are the WORST!
wow 1d is everywhere
As you might have GASSED
Just no
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.
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.
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)
8.56 : It's HCL not HCL3
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.
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
As you might have GASSED,
Crash course videos are EGGcellent!!
P.S.HANK U R THE BEST!!
+
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
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.
Hank, we are usually concerned with root mean square in thermodynamics, not statistical mean. They are distinctly different.
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.)
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...
Watching crash course is how I am spending my summer. I know, I'm awesome.
When he said, not the hatness, I looked up and was like NIALL OMG lol
Ikr
Me too!😂
This is the first video I could actually apply my years of Biology education to. Yay.
I LOVE NIALL HORAN, WITH HIS BLUE EYES AND BLONDE HAIR HE MAKE ME DO DIS💁♀️
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.
As far as we need this is the old AP Chem Course
Awesome experiment! MORE MORE MORE!
This video instantly won when Koffing and a Pokeball were used to illustrate an example.
Excellent sir I understood now thanks
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
Cooooool!!!!! I loved the Koffing!!!
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.
Got say this made a lot more sense then the 2 min we covered this in Chem class.
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
I can't fully see Hank's shirt, but I can tell that it's awesome.
"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
1:38 Reference. you just earned a sub
omfg, I laughed when Hank said One Direction, then he used NIall !! as an analogy for hottness !! yasss !
I loved the use of Koffing at the beginning :D
Perhaps future students will find it even more handy to have the complete series.
Love the Koffing!!!
Excellent use of a Koffing, Crash Course.
Yay, next episode is out!
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.
Have you guys considered making the crash course series available on DVD? As a teacher with sometimes unreliable internet, I would be interested.
Please please please do a chemistry episode about salt!
the examples help soooooo much
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
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.
4:12 Well no. The mass is inversly proportional to the square of the velocity and thus the velocity is inversly proportional to the squareroot of the mass.
I hit the Like button as soon as I saw Koffing.
I love how Hank tried to do John's "chair slide" Crash Course intro at the beginning...
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.
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
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.
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.
The airspeed velocity of an unladen European Swallow is roughly 11 meters per second, or 24 miles per hour
well these are a great review for my first year of college chemistry.
Anyone notice Hank's shirt?
Nice references btw.
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.
So much better than... my chemistry homework.
velocity is actually displacement divided by change in time. Speed is total distance divided by change in time
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)
Rotten eggs produce hydrogen sulfide. What kind of gas do humans produce? 2:07 Net Velocity vs Average Velocity. Definitions. 3:12 Tempture. An expression of the average kinetic energy of particles in a system. Why heat burns speed of particles. The faster the speed the more energy. 3:58 The formula for kinetic energy. The cool thing about science is that it always makes sense. The uncool thing about religion is that it rarely makes sense. 10:25 Summary!
1, kickin' shirt there Hank.
2, How do you avoid copyrights with how much stuff you guys slip in there?
never knew that last experiment, it's very cool
Very nice explainaion
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....
Koffing was in this video, AND THERE WAS MUCH REJOICEMENT! *yay*.
awesome hank we love your videos
Was no one else freaking out when they threw out a koffing?
I finally get the HCl + NH3 in the tube experiment... 1 year later. Thanks crashcourse team. :)
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!
What is the exact difference between effusion and moving down a concentration gradient?
Sweet you made a Kaze no Kizu (wind scar) at 09:07 :)
- Heidi
Excellent video!
Passing gas!
This is all very handy, but my chemistry exam was yesterday.
stupid fast stove particles get me every time
Wait, so burns are just increased molecular speed in our bodies? Then why does combustion occur at an extreme heat (like when close to lava)?
Yup, burns are just increased molecular motions of our cells to the point of damage. Nociceptors are nerve cells that pick up this damage and report it to our brains as pain. Combustion doesn´t occur because the activation energy to reach combustion is too high for the molecules in our body compared to say paper.
Denaturation of proteins and other organic molecules can go a loooooooooooonggggg way.
So... Maybe I'm not smart enough to understand ALL of it because I'm actually going to the 8th grade.... But can someone explain to me what "mv" is and means?
Life saver.
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
You can also try to download the videos to your computer using a converter. It's free but it's kind of risky.
He speaks faster than the velocity of gas
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...