The Creation of Chemistry - The Fundamental Laws: Crash Course Chemistry #3

[@crashcourse]

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

[@shinchanthebest]

i see u lol

[@shinchanthebest]

did it lol

[@mariainesgarcia2767]

43 and starting to learn chemistry for the first time (I faked in high school) THANK YOU!

[@elisethierbach2784]

"You're thinking 'UGH! The guy who invented chemistry should be put to death!' Well you should feel bad, because he was." -Hank Green

[@peanut123594]

A wish they would do a crash course on music theory. Never could get my head around it despite 10 years of piano experience.

[@rubydeax9267]

Yes! That would be great

[@ericahale8788]

peanut123594 YES

[@menamusic6487]

peanut123594 I vote for it too

[@caitlinclark-mcclure1347]

A little late to this train but YES!

[@skalymusic]

This would be great

[@MarioDiciple]

Can't sleep so what better to do than learn.

[@jynfalcon3150]

Same.

[@altonblast5]

Jyn Falcon same

[@meme-gy5gx]

ThatDudeGuy yep.

[@AnnieKateWalsh]

pretty much.

[@orekihoutarou6107]

+ThatDudeGuy Cure cancer or Muscular Dystrophy.

[@jynfalcon3150]

You guys should make lesson plans for teachers worldwide. People would be a lot smarter, I guarantee.

[@FROPDESAI]

Jyn Falcon Am I the only one around here who binge watches these?

[@xFirebird925x]

FROP DESAI I do. Cuz I have IB HL Chemistry test in less than 2 weeks. :P ....Even though these videos don't really help. I'm just relieving my anxiety, lol.

[@FROPDESAI]

xFirebird925x Actually, i don't have a test in sight for months. I just see them for fun.

[@zabbya9014]

The magnificent creep Just because he made the word, doesn't mean he was the one who defined or reformed Chemistry. Many others contributed to Chemistry and they added on to the subject. An example is the person who named ions. The person who discovered them asked him to name them.

[@GrapeCoolAide]

I will be 21 years old this year so its been about 3-4 years since high school (and I have been working and going to trade school since then) so no test in sight for a while and Crash Course as a whole literally helped me through my HS experience lol. I was a beast and still am in History/Social Studies thanks to crash course History. I don't watch the videos as much as I used to as a teenager but its good to learn something new after a hard work week.

[@ScarlettaAgni]

I have a chemistry exam tomorrow morning. God save my soul.

[@kristenstewart5448]

I have an EXAM! HELP! *jumps in the circle*

[@shadowacesonic2827]

+kristen stewart Exam for me tomorrow. O.o

[@kristenstewart5448]

Well...how was it?

[@ScarlettaAgni]

Well I was failing the class beforehand so I just barely passed. It's not a summer school class so I lucked out~

[@fahxd._9986]

Same here..Well its the reason im here..

[@Videosaurus_Wrex]

i love how you spent 1 episode on sig figs and my chemistry course spent a month

[@MoJoM0J01]

Right? the class should have just showed the episode. assigned watching it again for homework, then given a quiz next class.

[@Videosaurus_Wrex]

or had us practice sig figs while solving other problems instead of pages of just sig figuring stuff for almost a month, i think actually that might have made their marking slightly more complicated (i have to do the maths for .5 mark, derrrr) hurray for condescending idiotically lazy instructors, like my drawing instructor whom spent half the class insisting all of us redo basic shapes instead of moving on because of a few in the class whom quite frankly just sucked at art at that point in every possible way, except determination to try except being so terrible.

[@NavW]

So true. We spent a whole month on the history of who discovered the atom, but it didn't focus on any of the people mentioned here...

[@vt_near]

Chemistry is more about solving problems and internalizing things than 'knowing theory'

[@lucasm4299]

Lone Wandering My chemistry course spent a week and had a test. You’re lucky/unchallenged

[@raymondhertz1476]

When I was teaching I put a joke on a final exam: "If a gram-mole is Avogadro's number of molecules, is a guacamole Avocado's number of molecules?" Out of a class of 300 I got exactly 0 laughs.

[@epicactual5209]

I know your post is a week old but I had to respond anyway. My world history teacher did something like that: "Who wrote the Iliad?- A) Aristotle B) Homer) C) Socrates D) Walt Disney I was the only person who chuckled during the test.

[@MrGamerIndex]

***** Homer duh derpy

[@cutoororoo685]

For some reason you sound kinf of like my dad not only by the name but the jokes too... Funnny but not toooo much..

[@James55-w3x]

time to resign

[@anjiwhatever5644]

Raymond Hertz If it's any consolation...I would laughed my larynx out on it !

[@jesseclark7105]

THAT'S WHY HYDROGEN IS CALLED HYDROGEN?! THAT MAKES SO MUCH SENSE.

[@Lrjan2]

+Jesse Clark from the Greek ὑδρο- hydro meaning "water" and -γενής genes meaning "creator"

[@nicememe8608]

+Jesse Clark Additionally, Oxygen comes from Greek 'Oxy Genes', meaning acid forming, since oxygen's affinity for electrons often makes other compounds more acidic by taking their electrons. Oxy can be loosely translated into "sharp"- acids dissolve/cut away at things. For example, Oxymoron means sharply moronic (sharply dull, some even claim the word oxymoron in itself is an oxymoron). 'Genes' refers to creating something, i.e. "genesis" meaning creation.

[@kaydencedelon6972]

Jesse Clark it was originally named flamble air and used in rocket ships as fuel because it was so easy to burn and gave lots of energy

[@ethanhuyck4704]

We called it Hydrogen before it was used as spacecraft fuel. About a HUNDRED years before it was used in spacecraft fuel. Also, I don't think the original name was "flamble air"

[@arif4896]

Wow I am dumbfounded

[@lachlanwalford8183]

Mr Green I'm enjoying all of the crash course episodes and working my way through them watching them again and again, they are fantastic. Would you do a playlist on mathematics, e.g from the fundamental basics to wherever you decide to stop. Thank you.

[@jamimarj5253]

please do this!!! i need this

[@ahsanarifeen7827]

need it too

[@roseellis8617]

It would be incredibly helpful if it even went over the fundamentals of maths, your channel has helped me through a lot of my a levels except maths, the way you explain it is much simpler than my teachers, it'd be really cool if you could!

[@LiLi-vk9us]

Maybe you should try KhanAcedamy

[@TheGuroLOLITA]

Mr Green XDDDD

[@xxblueeyesxx522]

3:42 "stuff remained stuff, you can't lose any" yeah tell that to my bobby pins at 5am lol

[@aviezerscop401]

You didn't lose it, the Borrowers took it.

[@aksharaa5376]

@@aviezerscop401 Forever.

[@aviezerscop401]

@@aksharaa5376 😁

[@juliamoore338]

This made me laugh way too much

[@khayyam3000]

Hank Green for President

[@FROPDESAI]

Khay Pettway He has my vote!

[@nocapsaggy9565]

Carson!

[@alanabellamy9108]

***** How do you know?

[@kennethprice1593]

+Fabulous Gamers What's wrong with being a creationist? Also, he's a brain surgeon, so he's obviously not that stupid. Just saying.

[@khayyam3000]

Brain surgeon doesn't qualify one as smart. ... or a leader. ..

[@jakkscoffeebreak]

thank you for explaining how we went from alchemy to chemestry. i'd always thought we'd gone from one to the other through a better understanding of atoms, but this fills out all the blanks. plus, now i can explain it to my relatives and not have them look at me like i've grown a third head.

[@Silas_MN]

I haven't even finished the video yet, but I just HAD to say it. Amadeo Avagadro and Gay Lusaac are street names in a part of Córdoba, Argentina where I spent much of the last six months. So awesome to find out where they come from: CHEMISTRY! Thank you for not simplifying that part of the story, Hank!

[@kaio.mccollum6890]

Mr. Green , You should be my chemistry teacher . I get so lost and confused , I don't know what I'm doing . Your videos have been so helpful to me . its amazing . Thank you so much !

[@reggiefields6551]

thank you crash course. your series is educational, entertaining and funny!

[@bradscharmann8810]

03:37 Of course I wouldn't try to measure the mass of a stick of dynamite at home! I can't! I don't own a scale.

[@ana5tas1s]

Can you please do a crash coarse in PHYSICS?

[@Coolio_Ash]

dude i agree.

[@ana5tas1s]

can you send a link please?!!!!!!!!!!!

[@Ogelsvy]

***** Those four episodes mainly covered the four fundamental forces - a physics course involves a ton more work.

[@ana5tas1s]

i know but i think that many more people will watch the channel.

[@fire619]

ya i would love a series for physics. I'm not doing that well in class.

[@amandahopkins3842]

This is all so useful, I just feel like the information would really sink in if you spoke a bit more slowly.

[@constantine2920]

Amanda Hopkins If you wish you can go into KZbin settings for the video and slow it down if you need to

[@kurtschatteman5193]

+Amanda Hopkins You are actually right about this. English is my second language, so I understand what he is telling, but he speaks too fast and above all nervously. I prefer the english style. Calm and clear. I'm however going to watch all the episodes because they are way to interesting to miss out on :-)

[@RTukka]

I am pretty sure that an average person with no familiarity with the subject matter would miss a lot of the important points expressed in this video. It's a combination of the fast talking and the usage of technical language without clarification or further explanation. But maybe these courses are designed for really smart people? Or maybe it's intended for people who already learned the material once and just need to jog their memory? But those notions somewhat seem to clash with the way the "fun" and carefree way the information is presented. I also suspect that the historical context that's presented in the video may also be a bit disorienting and distracting. That context may be helpful in a typical lecture where the audience is given time to process and visualize the bigger picture (the scientists' personal stories, their hypotheses and experiments, as well as the ideas of empiricism and the scientific method which are so well illustrated by these early experiments) but I'm not sure it's great info for a "crash course," which perhaps should be a bit more focused.

[@user-tv3mc5tr9b]

Quinstol why do you need to make things sound way more complicated than they are i would write a response to you but im not 100% sure what you point was.

[@juliaraftery3234]

All three of my children watch your videos nonstop! They love all of them! They are in 2nd, 4th and 6th grade. Thank you for the fantastic content! They enjoy all the subjects. If I had a million dollars I'd give it to you!

[@aronandren5216]

right now i'm floating above my chair because of how electrons and photons work

[@vhavahgmh]

Good for you

[@___xyz___]

Floating is very good for you :-)

[@truboo4268]

1. Photons are light particles 2. You mean protons 3. That's not electrons and protons work

[@user-tv3mc5tr9b]

Bryan Cotto i think its a joke bruh

[@lsmatheny]

This is a great review of chemistry (which I haven't taken in 25 years). I do hope you do a physics course at some point, as my high school physics teacher was terrible and I never attempted to learn it again. Better late than never!

[@calc3085]

Chemistry is like a cult or something.

[@jordanzish]

I, err... what?

[@Leadvest]

Yes

[@tahaahmed9722]

fuq?

[@bingovalue]

Ye all the scientists in the world work together in a blood cult

[@somewhiteguy1945]

@Cal C, haha, ikr

[@feralnerd5]

I was watching this video as I did my pre-vocal warmup breathing exercises, and at the end, I found myself saying, "That was fun." And y'know what? It was! A half hour of breathing and learning chemistry just went by and I hardly noticed. Thanks for making this, Hank!

[@youssefmosleh9547]

Dude you guys do an amazing job and it is funny sometimes but you guys helped me anderstand a lot of things I didn't know before so thank you so so so much and keep up the amazing work thank you so much

[@rmya]

i have my sat chemistry in 2 weeks :') never been this nervous before. trying to watch all these videos. wish me luck (& the mental capability to memorize & understand everything)

[@SydneyMadueke]

0:00 bottom left corner, Mini Hank getting a haircut

[@nara9793]

!! I haven't noticed omg :DD

[@RedGlasses12]

These chemistry videos are really helpful. I'm crap at chemistry, always have been, but because I only have time for one more year at my local college and I need to cram in as many required classes as I can before next summer, I am taking a chem course that will probably knock me out with all the stuff I don't know. Thank you, Hank, for making it a little easier on me and helping me with my self-imposed summer homework :)

[@trevorcastle5137]

I wish I could watch this all night too bad sleep exists.

[@NyxLux7]

Currently we are doing organic chemistry... Finally something I understand! We watched your first video in class a few weeks ago and my brother had me find your channel to help me and my grade. I'm not failing but not doing so well either. Thank you for sharing so many videos, it's helping me a lot.

[@addykruse8189]

Shout out to all those marathoning all the Chemistry videos studying for the AP test tomorrow.

[@IntricateUniverse25]

Crash Course Physics...Please make it happen in the near future!

[@KarlFFF]

I really like to get the history perspective added to my chemistry knowledge! In school we had to have cross subject project and never understood why history and sciences never had cross projects, seems like an obvious and great idea!

[@Kelly-lx8gs]

Your animations and video edits make your videos so delightful to watch and helps with engaging with the material. Thank you so much!

[@alex31721able]

he could have been batman but he was a chemist, I love chemistry but if I inherited a load of money when my mom died in would be batman.

[@wizardsuth]

Batman is also a chemist.

[@mkupcha3184]

He also would need a dead dad

[@justchris846]

Batman knew chemistry

[@sepuluhempat2958]

Thanks Hank I keep falling in love for chemistry laws over and over again. :)

[@matthewfishermv]

Great video - I love the historical, story-telling approach to this.

[@camerongray7767]

U guys are literally the only educational lessons people actually watch for fun

[@veganchris1933]

Dobby is a Genius!

[@jahdielmaestre-ruperto7557]

Because of these videos I made a 78 on my exam and my final grade was an 83! I don't think I've ever been more excited about a 78!

[@edwardaguilar2566]

Love him or hate him, this guy's speaking straight facts

[@michaelgiusto9044]

ofc smh my head

[@jumanahidris2973]

I think we should all take a moment to appreciate the amount of research that went into this. Thank you, Hank.

[@meenadhanwant1]

Seeing comments from 4 years ago saying they have their exam tomorrow and your there in 2019 like... same :/

[@leo-hao]

2020 same

[@deamontethomas2982]

@@leo-hao same

[@diyapudota]

@@deamontethomas2982 not same corona got our exams cancelled

[@randomalpaca]

I got an ad for a study website... while on what I percieve to be the greatest studying channel ever.

[@chadpatron1341]

Hank: "How did we get here" My mind: "Do you have 90 minutes"

[@AfroDanceWithZeAmazingBreezy]

i've been watching yours videos and my knowledge in chemistry is increasing at such an unbelievable rate....thanks

[@DiazShitAndStuff]

NO TYRONE ↓ ☻¹ YOU musT CONTINUE TO WATCH MTV ♀ :○█

[@FROPDESAI]

holyfckwhydoesgoogleletmehavesuchalongassnamelmao What the fuck....

[@imogenasenath9669]

This show is my savior

[@CaitieBabe45]

My chemistry grade is now an A :) THANK YOU SO MUCH! God bless!

[@milosminion]

Hank wants to teach me about chemistry. My lack-of-focus-level: noticing hank's haircut as well as the fact that cc's #'s 1 and 2 were probably filmed on the same day

[@fatimac5253]

Nice haircut! Looking good! Also, I thought I'd mention that I really like the personalized-to-Hank openings! :D

[@bjpainting48]

l'm really enjoying these crash courses myself witty and funny too thanks

[@jruss110]

I might've actually taken Chemistry in high school if you were teaching. You explain it so well!

[@SpadaccinoLuciano]

So THAT'S how the phlogistinator from TF2 got its name...

[@jesseclark7105]

+SpadaccinoLuciano HOLY CRAP.

[@austinchin3846]

+SpadaccinoLuciano mind = blown

[@najamsiddiqui726]

Application at its finest moment

[@coldporridge4513]

+SpadaccinoLuciano Bloody Brilliant!

[@musavir1659]

Hey Hank, please help me clear my confusion. I don't understand what you say about Gay Lussac's law (7:40). You say that: Gay Lussac published a paper showing that volume of oxygen gas is two times smaller than the volume of water vapor it creates. I guess it should be the opposite like: The volume of oxygen gas is two time larger than the volume of oxygen present in the water vapor. Please elaborate your answer.

[@evanknowles4780]

At first I flipped because I had the same shirt as you.Then I realized that I got it off of the DFTBA market so of course I did!

[@chanseolee5512]

How does the oxygen atom in the compound NO (0.875g) have a larger mass than the oxygen atom in the compound N2O (0.4373g)? Also, there are two nitrogen atoms in N2O and only one in NO. How do they both have the same mass of Nitrogen? (VIDEO TIME: 6:45 )

[@doyouknoworjustbelieve6694]

CS ಠ_ಠ Lee The stated oxygen masses are in relation to one gram of nitrogen

[@paddleed6176]

Lavoisier didn't discover a single element. While he might have named them, he was not the discoverer, especially not in the part of oxygen. Hydrogen was Cavendish. Oxygen was Scheele, but Priestley was doing very similar things independantly at similar times. Edmond Genet about Lavoisier: "I also had the advantage during my stay at Birmingham of becoming acquainted with Dr. Priestley who had the kindness to repeat for my gratification his most interesting experiments on air and gases of which I sent an account to the Academy of Paris. At that time, Lavoisier was pursuing the same subject, and I was surprised on my return to hear him read a memorial at one of the sittings of the Academy which was simply a repetition in different words of Priestley's experiments which I had reported. He laughed, and said to me, "My friend, you know that those who start the hare do not always catch it."

[@paddleed6176]

***** Because he was a deceitful businessman.

[@TheShaleco]

I am not doing well in chemistry this year.... these videos are really helping... thank you Hank! If possible could you do a video on nomenclature?

[@Fuqyocouchh]

I heard physicists say that according to Einstein's relativity theory matter does turn into energy thus losing mass. So in theory if i burnt 1 mole of methane and somehow collected all of the products the mass after would never be exactly equal to what i started with. I think this is pretty much negligible with combustion and all chemical reactions, though.

[@JoshuaDuaneClark]

I think that in that reaction, no mass is loss. If you split your atoms and collected the energy, then you'd have less mass. That's my understanding.

[@norrinradd6746]

It's not really relativity theory, but rather the E=MC(squared) equation that makes that claim, and it is really only applicable to nuclear and particle physics, rather than chemical reactions If a quark and an antiquark annihilate, converting into energy, then that mass is lost, turned into a proportional amount of energy, but in chemical reactions all of the atoms and subatomic particles are still there. Nothing annihilates. It just get's rearranged. For this reason, while the quark flow diagrams of particle physics look alot like chemical equations, they don't necessarily balance due to the possibility of annihilation. Since mass always remains constant in a chemical system, however, chemical equations always have to be balanced. The amount of mass in a chemical system remains the same, but in particle and nuclear physics, that isn't necissarily the case because subatomic particles may annihilate.

[@Cameldactyl]

Conservation of mass turkey.

[@norrinradd6746]

Goku -San Again, it’s really the total sum of mass and energy in the universe that remains constant, rather than the amount of mass, strictly speaking. Photons have no mass, but can reduce the mass of a quantum system when emitted. When particles and antiparticles annihilate each other, that matter really is gone. It is replaced by a proportional amount of energy, and having all of that energy in such a small space will occasionally allow virtual particles to become real, generating new matter by having the equation run the other way. This is how particle accelerators work. The poster’s basic assumptions weren’t entirely flawed. They just have no place in chemistry, where these sorts of reactions don’t occur. If this were a video on particle physics then his point would be valid. Matter can be lost in principle. It just takes very exotic phenomena for this to occur, and the matter lost must be replaced by a proportional amount of energy, which has no mass.

[@Cameldactyl]

Norrin Radd First of all, I wasn't replying to you. And second conservation of mass applies to a chemical reaction like something being burned, which is to what i was referring. I am trying to tell Tom k there that burning 1 mole of methane is a chemical reaction and e=mc2 is not happening there.

[@jonnyunited]

OMG HAIRCUT!!! Also, this channel is amazing!! Thanks for everything every one of you do!

[@Julie-gv3je]

Am I the only one that is going to learn about this in like 5 years and just is watching this because I like chemistry

[@keiraward5246]

me too

[@user-tv3mc5tr9b]

saaaaaame

[@KatRocksCA]

I love the details Thought Bubble puts into the videos! I mean just in Hank's messy college dorm there was the TARDIS and the Death Star and even a TMBG poster!

[@claireswadling2965]

Any one else notice that before this they referred to their graphics team as "thought bubble"

[@fancybluepen3489]

It says in the credits under Thought Cafe "*(formerly known as Thought Bubble)" :)

[@haplilhales]

The Fantastical Legend of Blinking Beheaded Lavoisier

[@Brickerbrack]

Is John Dalton the name Harry Potter took when he went into witness protection?

[@mahaagro7783]

+DrawnSteelHero I was waiting for someone to notice.

[@juliar98]

THAT EXPLAINS THE SCAR! I was wondering what the connection was!

[@vb7960]

And the subtle 9 3/4 in the bubble beside is portait

[@trayshock1119]

Now this is a great example to help gain a better understanding in science, if you are in high school or in collage.

[@Anzaii1]

I like to think that you and your brother are like Frasier and Niles. Your dad is always frustrated about your scientific arguments at home and just wants to watch Bonanza :D

[@BlackCat_2]

If my teachers in high school made the lessons as interesting as you have I would have definitely learned more. My biggest problem was I was consistently bored - except in Accounting class - I even kept in touch with that teacher beyond high school. He had a great way of keeping kids interested in what he was saying. - Heidi

[@AutisticRebbetzen]

Watching these videos with KZbin's subtitles is hilarious. As great as Avogadro is, it is much funnier to think about Avocado's Number.

[@jeepersitsmeepers]

This educational channel is NO WHERE NEAR as famous as it should be. CRASH COURSE 4EVER :D

[@Phazon8058MS]

6.022 * 10^23?

[@codeman99-dev]

That is what is so cool about Physics though! It's the actual application of math, the reason that complex math exists. The two are quite parallel, although school teachings separate them an awful lot (probably incorrectly at that).

[@sitarahariharan475]

Hi Mr. Green, Can you please do videos on Physics?

[@007Saad007]

OH- man, he is perhaps the best speaker! i just love his style! :the perfect combination of hUMOUR with a sense of sincerity towards his video.

[@mahdmalik1517]

"Italian house elf" HAHAHHAHAH

[@GP-eh1rd]

this is awesome!!!

[@kylelance4280]

so the three laws r: 1/law of conservation of mass and 2/law of definite proportions (of a chemical compound) 3/Avogadro's law --- I've got 2 questions to Mr.Green or anyone: 1/ According to the house elf experiment. When he weighed 2 flasks containing different kinds of molecules: Was it because of the difference in mass between the 2 flasks that made him realized there were existences of atoms and molecules? (assuming one flask was containing WATER and the other was containing Oxygen) right? 2/ Can a Molecule also be a Compound?? I mean is the term "compound" contain the term "molecule" or they can be used interchangeably???? For example can water be called a "molecule" or can O2 be called a compound? I'm confused!!!

[@justinmason9114]

+kyle lance 1. Yes. Because he knew there to be roughly the same number of molecules in each flask, he knew that the difference in mass must be attributed to a difference in mass of the individual Molecules. 2. Yes, a Molecule can also be a compound, but it will not always be a compound. A compound, by definition is a collection of two or more elements that cannot be separated by Physical means. Thus, Molecular Oxygen (O2) is a molecule, but it is not a compound, because it only contains one type of element. By definition, a molecules contains two or more atoms, not necessarily elements, that are Covalently (a type of Chemical bond that involves the sharing of valence electrons between two atoms) bonded together. Covalent bonds only occur in nonmetals, so all molecules (which have covalent bonds, and contain only nonmetals) have no net charge. In contrast, an ion always has a net charge (meaning an imbalance in the number of protons and electrons), be it positive or negative. Applying this to the definition of a compound, a molecule that contains only one type of element is not also a compound, but a molecule that contains more than one element is also a compound. For instance, Carbon Monoxide (CO2) is a molecule, containing only nonmetals, and therefore only covalent bonds, and is also a compound, because it contains two different elements, Carbon and Oxygen. In contrast, Molecular Fluorine (F2) is not a compound, though it is a molecule. In contrast again, however, Hydrogen Carbonate (HCO3-) would not be a molecule, as it contains bonds that create a net charge through attraction of the net charge of two oppositely-charged elements or compounds, called ionic bonds. However, Hydrogen Carbonate is a compound, containing more than one elements which are impossible to separate by Physical means.

[@djr5995]

+Arjuna Niketas Great explanation!!

[@brittparkinson7046]

I'm really hoping that you'll make a physics version once this is finished, that's what I really need help on! Thank you so much for making these, you have a way of arranging words so that I can actually understand them. Keep it up!

[@AlphaLao]

This might just be me but at some points he goes way too fast to understand it all. This is coming from a person with little knowledge of Chemistry. Still, I will be watching this series. Nothing to lose and everything to gain.

[@anthonysummit3098]

ikr I am a Law student and these all just seems too complicated

[@ericarodriguez4894]

Just found your videos, and I have to say you are adorable! And oh yea thanks for helping me study for my A&P test :)

[@yoavwilliamson3378]

5:55 - CO2 isn't bent

[@randomasiangeek]

i've been saying this in every video but thank you for these videos. i'm learning the same material right now and this is great for refreshing my memory.

[@TheYopogo]

But if the french had a more equal and socially democratic system they could have deliberately given the money for research to whoever had the most promise as a scientist; rather than relying on chance that you will end up with someone who is both extremely wealthy and a genius.

[@ericferro510]

Crash course is simply incredible, and I simply love the "che-bio-lographies"!

[@skshiii]

Why is John Dalton dressed as Harry Potter? :O

[@FROPDESAI]

Sakshi Shrivastava Harry Dalton

[@samfitzpatrick8238]

john dalton was the name harry potter took when he went into witness protection

[@MaddieAngel1029]

Sakshi Shrivastava the second I read this comment the picture of Dalton popped up on screen!😂magic

[@TheGaryAir]

The test of the school year is going to be easy! Crash Course thank you so much for making these high quality, informative videos that truly do help me pass science, social studies, and english. I wish I could just watch these videos instead of school. :)

[@devinlewis5024]

My chemistry final is in 2 hours gooooooo crash course!

[@UndercoverLemon]

This was very fun. Thank you, crash course. Your time and effort are very much appreciated. Meaning I love you.

[@erinlaird110]

"And if you sit there reading over the same line 22 times..." Aaaaahhh Hank! If only you said 23, hahah. Yeah. Since Avogadro's Number is to 6.022 x 10^23 Okay. Bad Chemistry jokes... :(

[@blackbutterfly1117]

Trust me you explain this course so much clearer and better than MY chemistry teacher........... AHH thank you so much :)

[@Mitchontheweb]

Reviewing for finals

[@1901180108]

I was having one of those rough days where nothing goes right. You made it better. Just accept the points. :)

[@robert_wigh]

Thank you very much for making this video, Hank Green, Michael Aranda, Jenkins and all the others at _Crash Course_ Chemistry! I have actually watched 2 episodes of _Crash Course_ in a row, something I don’t usually do, so it kind of feels like I have cheated in the game of life, but anyway...thank you! I was kind of surprised, though, that you only mentioned European chemists from one age in history and that you did not mention Chinese chemists, for example the people who invented gun powder and where the first to write down the formula for making it and who had so much knowledge of chemistry that they actually used chemicals and gases in their warfare, as described in the Wǔīng Zongyào. Nor did you mention Arabic and Persian chemists like Zakariyya-ye Razi, who worked with crystallization of different substances and who wrote about the properties of different elemens in his book ‘The Secret of Secrets’, or Jabbir ibn Hayyan - also known as the father of chemistry - who also worked with crystallization, the properties of elements, discovered a lot of acids that are still used today and that worked with different dyes. Why didn’t you mention any of these noble scientists?

[@ErikSkoglund-je7ph]

Absolutely phenomenal! I'm totally amazed watching these videos.

[@claryfray2483]

PLEASE MAKE A CRASH COURSE MATH : CALCULUS!!!!!!!

[@TheWolfgangGrimmer]

+Mario De La Barcena Not exactly. It's more of a collaboration thing between Sal and the CC team.

[@lfdoidao]

i wish i had a teacher like you as a kid

[@girlwithkaleidoscopeeyes4771]

Since when does Hank's hair have a puff-level!?!

[@beawardo]

Hank, I like how you summarize and give us a table of contents at the end of your video. Even though I personally do not need it, it might be helpfully to others and I get a sense of organization in your videos. Which I don't see much of in John's. No offense to him, it just may be because I prefer math/science over history. I do love both of you equally though!

[@christianolivenciaco]

it sounds like hank believes that economic disparity was key to the scientific achievements that took place. but consider this, if one genius with most of the money could accomplish so much by being able to afford equipment and perform experiments, how much could have been accomplished if all the people had access to that equipment and could all work together and collaborate? Don't you think there might have been some geniuses in France that just never got the chance to do anything due to that wealth disparity? He said to think about the implications and I did

[@JitsevdH]

Hi Hank, I noticed some mistakes in the video. First, you stated that hydrogen is named that way because it was generated from water (2:58). It is quite the opposite: because water was made by the combustion of this gas, it was named hydrogen(erator). Second, the animation at 5:50 suggests that the carbon dioxide molecule is bent, though it is in fact a linear molecule. Also, the oxygen atoms are drawn much smaller relative to the carbon atom than they actually are.