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
At 6:05, I did the calculations and got 22.414007031828275. And you're right Hank, it was boring. I also did the calculations for the Hindenburg using ATM instead of 100 kPa and got 9,199,570.179161146 moles of hydrogen gas, or 9.2 x 10^6 mol H2. If I get enough thumbs up, I'll find a more exact measurement by using a better estimate for the temperature on that date.
To all students watching this: In the workplace, unless you're shooting a rocket or operating a particle accelerator, the Ideal gas law is correct 99.9% of the time.
Hank says: "The Ideal Gas Law often becomes little more than the Ideal Gas Estimate when it comes to what gases do naturally." My interpretation of this: Perfect world: "Ideal Gas Law" The real world: "Ideal Gas Flaw"
Man, these videos are just amazing. The amount of content expressed in ten minutes is formidable. I think it is the most brilliant material available for learning Chemistry. I graduated in Literature/Linguistics and have the bulk of my readings in Human Sciences / Arts, and, even so, I'm learning like hell. It's absolutely didactic. Thanks for this amazing work and congratulations. I'll keep following until video 46 and over :)
This was your best video yet, IMO. The inclusion of calculations (which I was compelled to double-check) made learning actually happen. I'd suggest including more calculations wherever possible b/c it'd take these videos to the next level of utility. Earning you praise beyond the ranks of the numerous 'my teacher sucks, but you're so amazing' comments that I believe less and less each day.
These videos are great! I'm Biology/ Pre-Med and they help me so much with class! Is there any chance you could do a Crash Course in Organic Chemistry? That would be awesome.
about an hour ago i was having an existential crisis over if I chose the right major because I suck at chemistry. this video helped me understand gas equations a bit more and subside the existential dread at least temporarily, thank you crash course
I'm sure there's some common ground between chemistry and physics. Also I'm really interested in physics as well as chemistry. I imagine PV=nRT can tell us many interesting things about Neptune. If gravity is holding the gas together instead of the wall of a balloon and it's at 1×10^−4 Pascals at the outer edge there has got to be some way of figuring out the pressure at some point in the middle.
I'm writing the Avogadro chemistry contest this week and I've missed a lot of Chem classes because of other commitments. Crash Course is saving my life!
I used this video all day today in my class. I am very bummed that I have always felt that Hank and John were just friends I haven't met yet... Now John has to go and write books that my students are carrying around. AND THERE's A MOVIE!!! Now, I am no longer this unique little flower that loves Hank and John. Now, I'm just another part of the noise that is John and Hank's fame. Oh for the golden days a few years back when it was just me and these cool videos my "not yet met" friends were producing.
+Chris Hammock I feel your pain. I didn't know who they were until they were both pretty much super stars...I still feel like we would have been best friends...
The makers of the Hindenburg not only filled it with hydrogen gas, but they also coated it with a mixture of iron oxide and refined, reflective aluminum powder. This mixture, as some might know, it also known as "solid rocket fuel." Which explains why it suddenly burst into flames as soon as the mooring cables touched the ground, and the craft's static charge was released. Now thumbs up for science and history, because you just learned several somethings.
Seriously i love y'all SO much your videos are so fun to watch and they're short, entertaining, and highly informative compared to other channels. Full support from me!!
Wow! thank you, these are some great terms I will look up right away. Originally I was trying to figure out the total volume of Neptune as it sits in space but I quickly realized that unless I think of space as having an extremely low pressure instead of thinking of it as a vacuum I was going to be dividing by zero. So I instead bounded the question at an altitude Wikipedia had some data about.
Examination results = Exam difficulty/Time spent listening to hank Seriously though this channel has helped out a lot I'm doing the Irish leaving certificate which is the most difficult secondary school exam in all of Europe the pressure is overwhelming and time we have to prepare is minimal these videos have helped take the pressure of and made me more secure in my ambition to become a chemical engineer if I succeed in getting the amount of points need the credit will go to you. you have no idea how grateful I am. thank you
Thanks for reminding me about all these things after 12 years. I scored extremely well in high school chemistry. But never used it after, because I chose a different line of work.
You're both right. Stanley Devastating didn't show a difference in his notation, but there is a problem with the video. The graphic around 2:50 effectively shows P*(V/n)*T = R when it should show PV/(nT) = R. Hopefully crashcourse will add an annotation or something to correct this soon.
Despite the little flaws in the video (tell Heiko or the editor of the equations) I like the style of these series (chemistry and history alike) as it helps to reach out to a layman audience.
Problems, exceptons, anomalies=complications. Ideal Gas Laws or Ideal Ideal Gas Estimate? Particles have no mass or take up any space??? 2:37 Three Laws. Boyle, Charles, Avogadro. Combined by Mendeleev! One smart guy. The R Constant. Ideal Gas Law valid under ideal conditions. 5:10 Volume Equation. I am mathematically challenged. A Crash Course on Mathematics? Hindenburg, "Oh the humanity!" An acceptable risk? 10:22 Time for some fun! Increased pressure leads to increased temperature. 10:57 Summary.
This is all pretty well established, and still very useful. So we learn about the people who first figured it out. As you get to the more advanced stuff, you'll come across more recent findings. Because the basic stuff has to be discovered first, that's what you learn about first when studying the subject.
Same thing. The order doesn't change the outcome. I learned it as PV/T = nR. That's why it remains useful (even at university) to be good at basic arithmetic, it means you don't have to dwell on those conversions.
You'll definitely need to know about hydrostatic equilibrium to explore your curiosity. As for the pressure being 1x10^-4 Pa "at the outer edge", it really depends on how one defines the "outer edge". From your comments, I think what you're interested in is the scale height of Neptune's atmosphere. Check out the wikipedia article on scale height.
it's more accurate, arguably, to use metric since Imperial measurements' definition depend on which country you are in. Which is why the metric system was made in the first place (The Kilogram is defined by a kilogram of iron in Paris, in conditions designed to minimise erosion, efforts which have been reasonably successful). The big disadvantage of metric though, is its inability to divide evenly into 3 or 7 evenly, which thanks to a mixed base Imperial units can.
In a series of experiments with his friend, Richard Towneley, Power discovered the relationship between the pressure and volume of a gas that later became known as Boyle's law. This relationship was outlined in "Experimental Philosophy." However, many may argue nevertheless that Boyle, after discussing the theory with Towneley and reading a pre-publication manuscript of "Experimental Philosophy" cited the hypothesis as the sole work of Richard Towneley. Boyle's mention of the theory preceded the publication of "Experimental Philosophy" by one year, which, combined with Boyle's promotion of the idea and his significant status as an aristocratic scientist, ensured the theory's moniker of "Boyle's Law." -Wikipedia paragraph
High P and T would make the Ideal Gas mentioned in the video even a better representation of reality. You can see why if you look at the improvement known as "van der Waals" equation, see en(.)wikipedia(.)org/wiki/Van_der_Waals_equation (just look at the "Equation" section). The nature of the improvement is the inclusion of the effect of attraction between gas particles and the effective volume taken up by the particles. Both are additive corrections which matter less the higher P and T are.
something I never quite understood: If we imagine a closed container filled with 1 mol of a molecular gas and these molecules then split into 2 smaller molecules each, thus raising the number of gas particles from 1 to 2 moles - the ideal gas equation would suggest that the pressure of the whole system would increase. However: if we look at a single molecule it seems that the temperature must drop. One heavy molecule at speed x produces two lighter molecules which - due to conservation of momentum - should still have the same speed. but since their mass drops the average kinetic energy per particle (and thus temperature) should drop considerably. Also: while it is true that we do have more collisions at the same time due to the increased number of particles, the particles also got lighter by that amount. Is the solution simply that (excluding energy given to or taken out of the system due to the endothermic/exothermic nature of the reaction itself) temperature will drop and pressure stays constant?
Ellie.S Bajie I second this. :) R= .0826 when you are calculating using STP at 1 atm. R= 8.3145 when you are calculating using kPa. (My class uses atm, though we actually use R=.0821.)
At 5:22 I think the significant digits are calculated wrongly. The question was regarding 1 mol of gas, which I think can be taken to mean exactly 1 mol, as this is a hypothetical question. (Writing it as 1.00 mol is silly as the zeros should go on forever. It should just be written as 1 mol.) STP is likewise an exact quantity - it is an arbitrarily agreed upon amount, not a measured amount. The only measured quantity in the equation is R, so the calculation should be accurate to the same number of significant digits as we know R to - in this case it is shown as 5, but according to wikipedia we actually know it to at least 8.
Matt Roberts No, writing 1.00 is NOT silly as the (hypothetical) instrument used to measure the amount of moles can only calculate up to three digits. Hypothetical or not, you're still restricted to the amount of sig-figs given. Unless there was an explicit statement in the problem, we can only go with whatever significant digits we are given initially. As far as I know, no problem will ever give you an initial measurement that has infinite sig-figs.
my Chem teacher is one who likes to teach until the very end so today, after an entire year of me annoying her to do so, she finally let us watch Hank. i had already got my AP World History teacher into watching John's crash courses before we quiz but i couldn't get my Chem teacher to let us watch this (bio too because there were some chapters early in the year that felt with bio) but today destiny was our friend and she let us watch almost all of the rash Course Chemistry vids as a review :)
Well, 1 cm x 100 = 1m x 1000 = 1km & 1g x 1000 = 1kg etc. is just much more intuitive and straight-forward than miles, feet, inches, yards and other arbitrary units. You can be guided by principles in figuring out what these metric units mean and how they scale, whereas the others just have to be learned... Still, I agree with you on the point, that some people are being really whiny and annoying in bringing up this topic again and again.
TrueCourse well as a German, without that animation I wouldn't have giggled about that only due to his pronunciation of 'Die' which sounded like 'die' instead of probably something like 'Dee'.
2:52. That's not correct actually. You aren't combining the correct laws. You can see, at 3:01, you rearrange incorrectly. If you did the correct algebra you would have PVT=nR, which is incorrect
Thank you Hank. My Chemistry teacher was a dick and I learned nothing from him. It made me dislike chemistry and think it boring. Thanks to you I have learned that I actually enjoy learning about it.
+Kirill Obraztsov And the us made a huge fuss about it to damage Germanys ekonomy, also the us where the only ones that could make helium and they didn't want to sell it to the germans... Air ships are awsome not awfull!
The meter is nowadays defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second." Originally it was defined as "one ten-millionth of the distance from the Earth's equator to the North Pole at sea level". So yeah, it's sort of arbitrary but it's based on verifiable and repeatable measurements. The kg is the last truly arbitrary SI unit (still based on reference objects) in use and they're working hard on a solution to this.
his little experiment can't top what my chem teacher did....she lit a green gummy bear on fire and the flames were purple....Hank yur cool too but that was AWESOME
Also, I was a bit confused by the insistence that 100kPa was STP, which led me to look up the value to find that this is the IUPAC definition. AP Chemistry and other US chemistry students should note that the NIST STP conditions are actually 1atm, which is the value used on the AP chemistry test. It would be nice if the team could mention that in a future video.
![Noob To Max With DRAGON REWORK In Blox Fruits [FULL MOVIE]](http://i.ytimg.com/vi/LnBMOinoOvA/mqdefault.jpg)
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
"... the ideal gas law, much like our culture, has really unrealistic expectations when it comes to size and attraction." Nice.
At 6:05, I did the calculations and got 22.414007031828275. And you're right Hank, it was boring. I also did the calculations for the Hindenburg using ATM instead of 100 kPa and got 9,199,570.179161146 moles of hydrogen gas, or 9.2 x 10^6 mol H2. If I get enough thumbs up, I'll find a more exact measurement by using a better estimate for the temperature on that date.
I always write Avogadro as Avocado in my Chem notes,
I hope David comes here and says " I know you exist Hank"
+RushaanPlays Your wish has been granted
+Caleb Linscombe ahahahahahahahah are you fucking serious ahahahh
To all students watching this: In the workplace, unless you're shooting a rocket or operating a particle accelerator, the Ideal gas law is correct 99.9% of the time.
What if I hit the 0.01%?
flash reference
Shooting a rocket’s equation
p=ma
P=the force applied to the rocket
m=mass of bullet
a=deceleration of bullet when it hits ship
Shivangi Singh ??? Particle accelerators r real u know
Must be why the particle accelerator exploded in Flash
Hank says: "The Ideal Gas Law often becomes little more than the Ideal Gas Estimate when it comes to what gases do naturally."
My interpretation of this:
Perfect world: "Ideal Gas Law"
The real world: "Ideal Gas Flaw"
Valter Fallenius nice pun👌🏾
nice
It would be so cool if David Tennant commented on this video.
I would just like to take this moment to thank Hank Green for helping me pass my 11th grade chemistry class.
This taught me more in 11 minutes than my chemistry teacher has taught me in 3 months..
David Tennant must know you exist Hank. You're as internet famous as he is.
I started CourseCourse preferring john, after this 13 episodes I'm team Hank all the way.
But as the old monk said "why compare?"
Same as me lol! At first, I liked John. I didn't like Hank at all. Because of his biology videos. But, now I like Hank more. Welp, Life changes.
Man, these videos are just amazing. The amount of content expressed in ten minutes is formidable. I think it is the most brilliant material available for learning Chemistry.
I graduated in Literature/Linguistics and have the bulk of my readings in Human Sciences / Arts, and, even so, I'm learning like hell. It's absolutely didactic. Thanks for this amazing work and congratulations. I'll keep following until video 46 and over :)
This was your best video yet, IMO. The inclusion of calculations (which I was compelled to double-check) made learning actually happen. I'd suggest including more calculations wherever possible b/c it'd take these videos to the next level of utility. Earning you praise beyond the ranks of the numerous 'my teacher sucks, but you're so amazing' comments that I believe less and less each day.
"and attraction, so far that's never gone away" Well Hank, you can blame that on all your damn charisma lol
These videos are great! I'm Biology/ Pre-Med and they help me so much with class! Is there any chance you could do a Crash Course in Organic Chemistry? That would be awesome.
Love the Doctor Who reference!
about an hour ago i was having an existential crisis over if I chose the right major because I suck at chemistry. this video helped me understand gas equations a bit more and subside the existential dread at least temporarily, thank you crash course
u r doing an awesome job man....here in India nobody teaches us that interstingly...keep u the good work
yes true that, if only teaching in India could be more than just rote memorization
I'm sure there's some common ground between chemistry and physics. Also I'm really interested in physics as well as chemistry. I imagine PV=nRT can tell us many interesting things about Neptune. If gravity is holding the gas together instead of the wall of a balloon and it's at 1×10^−4 Pascals at the outer edge there has got to be some way of figuring out the pressure at some point in the middle.
That moment when your teacher tells you to watch this video, instead of actually teaching you...
Daniel Van Horne not everyone has the skills, and maybe there was nobody better to hire who wanted to teach
David Van Horne that's a good teacher
I'm writing the Avogadro chemistry contest this week and I've missed a lot of Chem classes because of other commitments. Crash Course is saving my life!
"yes i'm looking at you robert BOYLE" xDD
The english subtitles are so messed up: '100 kilopascal' gets written down as '100 kill about scouts'
Rosa Maria lol.
Why are you using the auto-generated ones, then?
omg
They're meant to be ;)
00:07 Is your cartoon figure playing Settlers of Catan?
That makes me so happy.
I used this video all day today in my class. I am very bummed that I have always felt that Hank and John were just friends I haven't met yet... Now John has to go and write books that my students are carrying around. AND THERE's A MOVIE!!!
Now, I am no longer this unique little flower that loves Hank and John. Now, I'm just another part of the noise that is John and Hank's fame. Oh for the golden days a few years back when it was just me and these cool videos my "not yet met" friends were producing.
+Chris Hammock I feel your pain. I didn't know who they were until they were both pretty much super stars...I still feel like we would have been best friends...
The makers of the Hindenburg not only filled it with hydrogen gas, but they also coated it with a mixture of iron oxide and refined, reflective aluminum powder. This mixture, as some might know, it also known as "solid rocket fuel." Which explains why it suddenly burst into flames as soon as the mooring cables touched the ground, and the craft's static charge was released.
Now thumbs up for science and history, because you just learned several somethings.
Seriously i love y'all SO much your videos are so fun to watch and they're short, entertaining, and highly informative compared to other channels. Full support from me!!
Hi Hank! If your reading these comments. I just wanted to let you know that I really enjoy these videos. Please continue to make them.
Wow! thank you, these are some great terms I will look up right away. Originally I was trying to figure out the total volume of Neptune as it sits in space but I quickly realized that unless I think of space as having an extremely low pressure instead of thinking of it as a vacuum I was going to be dividing by zero. So I instead bounded the question at an altitude Wikipedia had some data about.
Demonstrating that increasing P will increase T was great. I’ve always had a hard time believing that until now.
I know you exist Hank.
+David Tennant hold on, tell me true, are you the real david tennant or not? and please be honest. if you are not then no hard feelings
thats what I expected, but it doesnt hurt to ask.
lol
IF David Tennent WERE to comment, I doubt he'd have 3 followers...
Hank always reminds me of David Tennant's doctor.
At 2:53 temperature should be in the denominator
These videos are amazing.
Examination results = Exam difficulty/Time spent listening to hank
Seriously though this channel has helped out a lot I'm doing the Irish leaving certificate which is the most difficult secondary school exam in all of Europe the pressure is overwhelming and time we have to prepare is minimal these videos have helped take the pressure of and made me more secure in my ambition to become a chemical engineer if I succeed in getting the amount of points need the credit will go to you. you have no idea how grateful I am. thank you
Its like as soon as I start to get it, something I forgot are don't understand shows up! Back to the first video I guess.
Thanks for reminding me about all these things after 12 years. I scored extremely well in high school chemistry. But never used it after, because I chose a different line of work.
am I the only one who finds his intelligence so freaking attractive? it makes me tremble and want to hear him talking more like wtf is that love ? xD
you have saved my life before chemistry exams a few times now xD Thanks for the videos :)
DAVID TENNANT AT MY HOUSE TO PLAY BOARD GAMES AND PUPPIES TO CURE CANCER!!! I'M IN!!!
PETA don't like when you use puppies to cure cancer
You're both right. Stanley Devastating didn't show a difference in his notation, but there is a problem with the video. The graphic around 2:50 effectively shows P*(V/n)*T = R when it should show PV/(nT) = R. Hopefully crashcourse will add an annotation or something to correct this soon.
I wasn't looking at the screen and all of a sudden I heard the Tardis and literally freaked out. I thought the Doctor came for me finally. :(
Thank you for not soiling your videos with advertisements like some lesser science RUclipsrs have.
6:29 "Hank Green and Crash Course are slammed by Wall Street Journal for Using Nazi Imagery in their videos"
Despite the little flaws in the video (tell Heiko or the editor of the equations) I like the style of these series (chemistry and history alike) as it helps to reach out to a layman audience.
Loved the experiment and the one when you crushed the can it was Kwl.
Problems, exceptons, anomalies=complications. Ideal Gas Laws or Ideal Ideal Gas Estimate? Particles have no mass or take up any space??? 2:37 Three Laws. Boyle, Charles, Avogadro. Combined by Mendeleev! One smart guy. The R Constant. Ideal Gas Law valid under ideal conditions. 5:10 Volume Equation. I am mathematically challenged. A Crash Course on Mathematics? Hindenburg, "Oh the humanity!" An acceptable risk? 10:22 Time for some fun! Increased pressure leads to increased temperature. 10:57 Summary.
isn't R=8.314 only supposed to be used for joule calculations? atm is supposed to be 0.08206....
Rachel Yeung Yeah, he used R=8.314 because he was using kPa instead of atm...but STP is 273.15 K and 1 atm, NOT 100kPa
This is all pretty well established, and still very useful. So we learn about the people who first figured it out. As you get to the more advanced stuff, you'll come across more recent findings. Because the basic stuff has to be discovered first, that's what you learn about first when studying the subject.
The Ideal Gas Flaw??
LOL love it hahahah
Same thing. The order doesn't change the outcome. I learned it as PV/T = nR. That's why it remains useful (even at university) to be good at basic arithmetic, it means you don't have to dwell on those conversions.
I love STP. Dead and Bloated is my favorite song.
Anyone else notice that (PVT)/n=R magically turned into PV=nRT? I did get the point, love these videos.
They rearranged the equation. :)
The actual equation is PV/Tn=R temperature is not inversely proportional to P and V
Maria Suhail They rearranged it incorrectly though was what he was referring to.
Thanks, this video will help through the ages
You'll definitely need to know about hydrostatic equilibrium to explore your curiosity. As for the pressure being 1x10^-4 Pa "at the outer edge", it really depends on how one defines the "outer edge". From your comments, I think what you're interested in is the scale height of Neptune's atmosphere. Check out the wikipedia article on scale height.
"carl sagan would be immortal" -agreed
Thank you for getting me to focus on studying for my chemistry final tomorrow.
HEH...... "The Ideal Gas Law, much like our culture, has really unrealistic expectations when it comes to size and attraction." Oh Hank, you dog you!
thank you so much for making these. i might be able to pass chemistry now.
at 2:57 shoudnt the equation be PV/nT=R..... Instead of PVT/n=R
+calvert nicholas i was thinking the same
Both are the same
Luke Johnson
i never said it was
I see whats going on. sorry bout that by "PV/nT=R" i thought you ment P(V/n)T=R given thats what it shows in the video.
U don’t understand how much this is helping
Who is Allison Kane??
probably someone he went to school with
A bonerific babezilla.
Probably his wife he is married
I wanna ig her now🙊🥰😂
it's more accurate, arguably, to use metric since Imperial measurements' definition depend on which country you are in. Which is why the metric system was made in the first place (The Kilogram is defined by a kilogram of iron in Paris, in conditions designed to minimise erosion, efforts which have been reasonably successful). The big disadvantage of metric though, is its inability to divide evenly into 3 or 7 evenly, which thanks to a mixed base Imperial units can.
David Tennant might know you exist
2:57 shows that [PV=(nR)/T]
"resident house elf Amadeus Avogadro"
In a series of experiments with his friend, Richard Towneley, Power discovered the relationship between the pressure and volume of a gas that later became known as Boyle's law. This relationship was outlined in "Experimental Philosophy." However, many may argue nevertheless that Boyle, after discussing the theory with Towneley and reading a pre-publication manuscript of "Experimental Philosophy" cited the hypothesis as the sole work of Richard Towneley. Boyle's mention of the theory preceded the publication of "Experimental Philosophy" by one year, which, combined with Boyle's promotion of the idea and his significant status as an aristocratic scientist, ensured the theory's moniker of "Boyle's Law." -Wikipedia paragraph
we crushed marshmallows using that tool in chemistry class
At 5:04, if you use 101.325 kPa (which is more accurate) instead of 100kPa, the volume equals 22.4L.
This guy's got a wee bit of hate for Boyle :)
just a bit
Long Johnson Well he was a scumbag
ehhh... i guess so
Ben Lyman How so? / How do you know?
You don't say
Oh wow!! This episode was super interesting, thanks for publishing it! :D
where have fire pistons been all my life? xD
High P and T would make the Ideal Gas mentioned in the video even a better representation of reality. You can see why if you look at the improvement known as "van der Waals" equation, see en(.)wikipedia(.)org/wiki/Van_der_Waals_equation (just look at the "Equation" section).
The nature of the improvement is the inclusion of the effect of attraction between gas particles and the effective volume taken up by the particles. Both are additive corrections which matter less the higher P and T are.
someone tell david tennet that hank exists!
thank you so much for these videos. they help me way more than my regular class. thanks !
I am sure David Tennant knows you exist!
someone should send this to him.
something I never quite understood: If we imagine a closed container filled with 1 mol of a molecular gas and these molecules then split into 2 smaller molecules each, thus raising the number of gas particles from 1 to 2 moles - the ideal gas equation would suggest that the pressure of the whole system would increase. However: if we look at a single molecule it seems that the temperature must drop. One heavy molecule at speed x produces two lighter molecules which - due to conservation of momentum - should still have the same speed. but since their mass drops the average kinetic energy per particle (and thus temperature) should drop considerably. Also: while it is true that we do have more collisions at the same time due to the increased number of particles, the particles also got lighter by that amount. Is the solution simply that (excluding energy given to or taken out of the system due to the endothermic/exothermic nature of the reaction itself) temperature will drop and pressure stays constant?
Can anyone tell me when do I use R = 0.0826 and R = 8.3145?
it all depends on the units you are using!
Ellie.S Bajie I second this. :)
R= .0826 when you are calculating using STP at 1 atm.
R= 8.3145 when you are calculating using kPa.
(My class uses atm, though we actually use R=.0821.)
Yeah same we use .821 most of the time too. :P
At 5:22 I think the significant digits are calculated wrongly. The question was regarding 1 mol of gas, which I think can be taken to mean exactly 1 mol, as this is a hypothetical question. (Writing it as 1.00 mol is silly as the zeros should go on forever. It should just be written as 1 mol.) STP is likewise an exact quantity - it is an arbitrarily agreed upon amount, not a measured amount. The only measured quantity in the equation is R, so the calculation should be accurate to the same number of significant digits as we know R to - in this case it is shown as 5, but according to wikipedia we actually know it to at least 8.
Matt Roberts No, writing 1.00 is NOT silly as the (hypothetical) instrument used to measure the amount of moles can only calculate up to three digits. Hypothetical or not, you're still restricted to the amount of sig-figs given. Unless there was an explicit statement in the problem, we can only go with whatever significant digits we are given initially. As far as I know, no problem will ever give you an initial measurement that has infinite sig-figs.
The last experiment was basically the inside of a gun.
I LOVE CRASH COURSE CHEMISTRY SO MUCH.
I'm sorry but who is David Tennant?
+Wahida Khatun David Tennant is an actor from doctor who. he plays the 10th doctor, one of the most beloved doctors of the show.
9h ok thanks mate
Meant to say oh
+Wahida Khatun Have you been living under a rock your whole life?
No. I'm from a village
my Chem teacher is one who likes to teach until the very end so today, after an entire year of me annoying her to do so, she finally let us watch Hank. i had already got my AP World History teacher into watching John's crash courses before we quiz but i couldn't get my Chem teacher to let us watch this (bio too because there were some chapters early in the year that felt with bio) but today destiny was our friend and she let us watch almost all of the rash Course Chemistry vids as a review :)
Well, puppies are helping to cure cancer now :D
Well, 1 cm x 100 = 1m x 1000 = 1km & 1g x 1000 = 1kg etc. is just much more intuitive and straight-forward than miles, feet, inches, yards and other arbitrary units. You can be guided by principles in figuring out what these metric units mean and how they scale, whereas the others just have to be learned...
Still, I agree with you on the point, that some people are being really whiny and annoying in bringing up this topic again and again.
No giggling.... I tried so hard not to. XD
TrueCourse well as a German, without that animation I wouldn't have giggled about that only due to his pronunciation of 'Die' which sounded like 'die' instead of probably something like 'Dee'.
Why would people dislike a video that is helping them learn more about the world around them?
2:52. That's not correct actually. You aren't combining the correct laws. You can see, at 3:01, you rearrange incorrectly. If you did the correct algebra you would have PVT=nR, which is incorrect
Thank you Hank. My Chemistry teacher was a dick and I learned nothing from him. It made me dislike chemistry and think it boring. Thanks to you I have learned that I actually enjoy learning about it.
That zeppelin was also painted with thermite.
+Kirill Obraztsov And the us made a huge fuss about it to damage Germanys ekonomy, also the us where the only ones that could make helium and they didn't want to sell it to the germans...
Air ships are awsome not awfull!
The meter is nowadays defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second."
Originally it was defined as "one ten-millionth of the distance from the Earth's equator to the North Pole at sea level".
So yeah, it's sort of arbitrary but it's based on verifiable and repeatable measurements. The kg is the last truly arbitrary SI unit (still based on reference objects) in use and they're working hard on a solution to this.
David Tennant playing board games :D
his little experiment can't top what my chem teacher did....she lit a green gummy bear on fire and the flames were purple....Hank yur cool too but that was AWESOME
THANK.YOU.
I no longer need this information, but if this had been around when I did, I would have wept with joy.
DAVID TENNENT
Also, I was a bit confused by the insistence that 100kPa was STP, which led me to look up the value to find that this is the IUPAC definition. AP Chemistry and other US chemistry students should note that the NIST STP conditions are actually 1atm, which is the value used on the AP chemistry test. It would be nice if the team could mention that in a future video.
this was posted on my birthday
HBD
Too late!
oh well, thanks anyways
I saw your comments on many of crash course videos .Which exam are you preparing for?
I am preparing for NEET
nothing, I just watch them for fun :) also, I am a bit obsessed with Hank and John Green
Good point. "fahren" can also mean "to travel" in the most general sense, and this might be indeed the better translation.