Stoichiometry - Chemistry for Massive Creatures: Crash Course Chemistry #6

Chemists need stoichiometry to make the scale of chemistry more understandable - Hank is here to explain why and to teach us how to use it.
Watch this video in Spanish on our Crash Course en Español channel: • Estequiometría: Crash ...
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
Table of Contents
Atomic Mass Units 2:24
Moles 5:12
Molar Mass 5:59
Equation Balancing 8:45
Molar Ratios 11:11
Resources:
www.chemistry.oregonstate.edu/...
www.iupac.org/publications/ci/...
Crash Course is on Patreon! You can support us directly by signing up at / crashcourse
Want to find Crash Course elsewhere on the internet?
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[@crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ

[@syedasadibrar6649]

This episode is very helpful. Sounds great that you are still focusing on it even 7 years later.

[@sudeepjoseph69]

k

[@dylanparry1815]

Absolutely love this channel and would never have dreamed of learning what it offers. Without being nitpicky just want to point out 8 mins deep in the episode its doing the math for the mass of sucrose and the oxygen mass is wrong 11mol x 16.00g/mol is actually 176g not 171g potentially putting the sucrose mass out. It may bug you it may not just pointing it out.

[@thatchessguy7072]

Is linear algebra used in stoichiometry?

[@trmdtv]

I dropped chemistry when I was 15. Now that I'm 32 - and all the pressure is off - I just like to watch these videos to learn. It makes me wonder how school can be so ridiculously ineffective. I just wished someone had explained to me then that we were trying to uncover the mysteries of the universe and it is an ongoing adventure - instead of making it feel like I just had to cram boring information into my brain.... Now I just love what John and Hank do!

[@xccaae]

Andromeda2803 I know what you mean.. I'm 26 and I want to gather as much information as I can.. because I started asking questions. In school they just put the information on the table and you have to eat it.. without really knowing what you are actually putting in your head. The education systems really must change. They must compel children to seek the knowledge.. not force it in their heads.

[@coolshava]

Andromeda2803 I'm a sophomore in high school and I get what you mean. The entire school system is just centered on mindless interminable homework assignments, and I (and many other students) would do so much better if there was no homework, and we were just watching the Crash course videos. The world would be a much better place if John and Hank were teachers.

[@burieddreamer]

Andromeda2803 Same here. I watch it on lunch time. I'm 28.

[@frankvandescheur1461]

Andromeda2803 just passed my high school exams. Watching this video, i remembered everyone that followed chemistry complain about how dang complicated it is, molar equations being one of the major issues. just through looking up a couple videos since i need it for university, i already understand so much of chemistry with only like 10-15 hours put in, while they've had 400+ school hours and extra work at home. School is so bloody ineffective, i actually feel really fucking embarassed that our school system (Holland) is rated really high and that STILL in this system all kids/teens spend so many years in school while basically everything could be taught within a single year. It's just a fucking waste of 10+ years of a kids' life that could be spent on work, discipline, self-improvement and far deeper knowledge and understanding of all subjects now taught.

[@oijoijajsdj2708]

+Yuri Nate ikr especially math classes they give you random formulas w/o proofs

[@jcmartinez7527]

School systems suck. I can watch these chemistry crash course videos and learn more effectively in less time. Thankfully, my physical science teacher agrees but has to follow the system to keep his shirt. The only homework he gives us is to watch these videos.

[@natashalee4732]

+Jose Martinez Are you from Singapore? bc your dp hahaha x

[@jcmartinez7527]

whats dp? And, its you're*.

[@liyilim]

+Jose Martinez it's 'your' bc 'dp' refers to display picture and is a noun, hence 'your' as it shows possession.

[@jcmartinez7527]

Stephanie Lim that makes sense. no, i just really liked the picture.

[@Monochromicornicopia]

+Jose Martinez Its the funding that is the problem. Here in Mississippi we are trying to get our public schools funded with "Initiative 42" which, if it passes, will force the legislation to provide the exact amount of money that the law states we should receive. At the moment, public schools in MS receive far less than the law says we should have. And yet you still see people actively putting out advertisements that slander Initiative 42 because people are stupid.

[@piplup1999]

Shout out to all the students watching this series coming up to their chemistry exam XD

[@zahraacr7xx796]

+TheGamerWith(No)Brains yup AS level/A-level chem anyone? :/

[@faiqamuqeem190]

+ZOEY CR7Xx O3 chem (5054) here, i got you bro

[@waseemzahid5508]

+8-Bit Senpai may june 620 fucking cambridge

[@tuvytjiposa9763]

IGCSE exam tomorrow.... anyone? no? okay. fml

[@kareemj6157]

i have my practical for AS chem on thursday

[@alexhoward5889]

Is it weird that I find Hank so relaxing and will literally choose to watch these videos without an exam deadline to consider?

[@Valsorayu]

Keeps my sanity too.

[@carterparkinsons9903]

Indeed, I am watching this and taking down notes while being home quarantined.

[@maelikesskittles]

My chemistry teacher is really mean so I keep waiting for you to yell at me and get mad but then I remember this is a video. And you are a nice person. And suddenly chemistry isn't as scary so thank you.

[@onkaarpaul1444]

stfu

[@thepremeddiaries5877]

Im Onkaar did you gain what you wanted from that?

[@onkaarpaul1444]

@@thepremeddiaries5877 wut

[@bcat010]

I wish I could have had someone like you as a chemistry professor. You do a great job of making these lectures easier to understand.

[@bcat010]

***** still, I like they way he lectures.

[@jacksoncarloollero5055]

Most instructors are just following a set of lectures on a textbook. This is why most f them don't really understand what they are teaching. How is it hard to have a degree in education when all you have to do is go to class everyday, but professors who have a PhD are another case.

[@samramos310]

Its a shame its only a crash course, ynow? I can't imagine how much I'd learn if he actually gave the class xD

[@jadelinmcleod9693]

It would be so awesome to have a teacher woth thia teaching style.

[@annekristelmangarin3196]

Agree, though I am afraid that I won't be able to catch up since there is no replay button in class. 😂

[@UzumakiNaruto-ez8jc]

It should be 384g (12 mol of 0_2) at 11:36 not 348g (12 mol of 0_2) right?

[@gerritbond9407]

Uzumaki Naruto That's what I'm getting as well.. Easy mistake transposing numbers I suppose?

[@octavioreyes1231]

Uzumaki Naruto I got the same result, it's a shame that this kind of comments aren't the most popular, maybe because not everyone is pausing the video every second just to check and recreate all the data.

[@prestonriegel4607]

Uzumaki Naruto Typo, probably.

[@jessicawickham4382]

Uzumaki Naruto 11*16 is 176, not 171. That's one issue.

[@Rin-qj7zt]

Octavio Reyes well at least right now this comment is the second top comment in the section, so i guess there's that... though the top comment goes to Planes for saying _"I struggled so hard with this shit my sophomore year in high school."_ so i totally understand.

[@tylorash]

The key to all scientific advancement: many many strokey beard meetings

[@Gam3B0y23r0]

If there was no beatdstroking, we would have been in bronze age now..

[@mr.visualstudio8029]

ha ha

[@KingOfShenanigan]

women too.

[@ScareSans]

i'd give this a like, but it's copied =-=

[@momijithelesbianleftie6578]

​@@KingOfShenanigan All women have light fluffy facial hair. Its not profoundly dark and thickened (terminal hairs) like it often happens in men due to testosterone. But women have some facial. Vellus hair. Everyone but the freshly shaven and pre-pubescent kids can participate in stroky beard meetings

[@jacoblee6079]

What I learned from this video: Hank can't drink tea properly

[@ThatOneGuy0006]

Face it, you're here because you didn't study for your preAP chem final tomorrow. Welcome to cramming hell.

[@1212hjb]

I do have a preAP chem final tomorrow omfg

[@chaunceymines]

Same my chemistry final is going to be hard

[@clairexiaoke]

yup

[@alexminser1482]

I actually don't start the class until next week

[@steveohface3683]

actually its a fuckin college level intro class and my teacher can't speak fucking english

[@rileyyoung98]

Stoichiometry is the bane of my existence, so thank you for this! And yes, I'm definitely cramming last minute by binging these videos!

[@planetexpress8125]

".. bunch of guys stroke their beards..." . Poor Marie Curie, everybody forgets about her ;(

[@TheMaddestHatter234]

PlanetExpress and Lisa Meitner. But she was jewish during the Nazi regime so there’s also that factor.

[@ilikecorks1715]

She probably stroked her beard too

[@epicgamer-ny4fj]

@@ilikecorks1715 she had the longest beard to stroke

[@TheBehemothGamer]

There is a calculation error here at 8:03 . 11 mol x 16.00 g/mol is 176 g. However, for whatever reason, your grams for sucrose were correct

[@bakedseal3369]

He should do a crash course for algebra and higher

[@aasthasharma3820]

+

[@alliekent5929]

The real reason is that Khan Academy already has Math on lock down. Check it out - it's free, it's awesome, and literally the only reason I passed my Algebra CLEP.

[@epicgamer-ny4fj]

@@mustafamirza7064 wow you must be very smart

[@coldflamelive1829]

thats it. im gunna be working at mcdonalds for the rest of my life

[@ProfessorSyndicateFranklai]

Don't be: Remember two things: 1 Mol is 6.022 * 10^23 and that AMU is basically how much it weighs in grams after multiplying by one mol. Confused? One mole of an element with an AMU of 57 would weight 57 grams, one mole of water is one hydrogen atoms and 2 oxygen atoms, which equals 34 grams.

[@HuongHoang-km7qg]

hey dude, you actually seems to get this lol. do you know much about naming compounds?

[@HenreBooysen]

I could help with naming compounds, depending how difficult they are.

[@HuongHoang-km7qg]

I'm stuck on trying to learn how to name covalent compounds specifically. Like sufulric acid, and phosphorus acid, stuff like that

[@ProfessorSyndicateFranklai]

I have no idea how to name any compounds, but for acids, to name any acid: For binary acids(containing two elements, hydrogen and the other element) *Add the prefix _hydro-_ , and change the element's ending from anything to _-ic_, and then add _acid_ as another word. For example HCl becomes _hydro_chlor_ic_ acid HBr becomes _hydro_brom_ic_ acid HI becomes _hydro_iod_ic_ acid Not sure about polyatomic ions though. If the ion contains an _ate_ as a suffix, change that to _ic_ and add the word acid. If the acid contains a polyatomic(molecule) ion with the suffix _-ite_, simply change _-ite_ to _-ous_ and add the word acid. For example H2SO3 becomes sulfur_ous_ acid HNO2 becomes nitr_ous_ acid Naming bases is easier. Just use the name of a chemical and then change the ending of a non-metal element to _-ide_ For example: NaCl becomes Sodium Clor_ide_ If the base contains OH-, then simply name the metal, then add hydroxide NaOH is Sodium _Hydroxide_ KOH is Potassium _Hydroxide_ For bases without Hydroxide Ions(OH-), then you're on your own. Anything else, that's the limit of my knowledge. Try these handy resources www.sciencegeek.net/Chemistry/chempdfs/NamingAcids.pdf www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/atoms-molecules-and-ions-2/naming-compounds-38/naming-acids-and-bases-214-1019/ If you don't get the terms, a quick google search will help.

[@briannacronin3944]

At 11:39s there is a typo guys, it almost caught me out. Instead of writing 384g as the mass of oxygen the animated slide says 348g. My calculation does work with the 384g though. Thank you very much Hank it's fun studying with your teams videos! :)

[@TuesdaysArt]

As I'm learning about chemistry, I find it really cool when I can look at the ingredients in a food or even the back of the water I drink and find out what's in it with my new found knowledge.

[@colonelcontinuum9615]

pretty much every episode of this I'm lost for like the first half and then after that it all makeS SENSE AND MY BRAIN EXPLODES

[@smilefishyish]

+ColonelContinuum my 7th grade science teacher taught us some physics during the year and whenever we understood something she called it a MIND EXPLOSION!

[@mariannekhansa5218]

Lol same

[@nh-a6713]

+ColonelContinuum so accurate

[@OYSTERPERPETUALS]

I struggled so hard with this BULLSHIT my sophomore year in high school.

[@travisisswole353]

Same right now

[@ShadowPylot]

Amazingness in Progress I never understood what's so hard about this. The most complicated portion of Stoichiometry is equation balancing, the rest is pretty self explanatory

[@knifepony]

Elijah Seabock Just wait until you get to aromatic organic chemistry. Benzene rings, resonance structures.. And most importantly how they react.

[@patelmandir]

+Elijah Seabock same here I'm in 7th grade too

[@McbrydeWithaY]

+‫جندي.‬‎ I said, i'll never use this, I'm not going to college for a science major, *3 years later, geology major* Shit.

[@MystycCheez]

Holy mole-y, this is awesome! :)

[@erinwilliams1259]

+Mystyc Cheez That's a cheesy pun

[@britishaladdin9959]

+Erin Williams that's punny

[@queensaharaice7376]

Lol...wait...UNDERTALE! Omg I love that game!

[@queenofpastel7732]

+Milo curry ikr!

[@electrokid2640]

no.....no.....NOOOOOOO

[@TheGlennLife]

You sir are about 70% of the reason I just passed my chemistry placement exam. Thank you sir! I haven't touched a lick of chemistry in years.

[@raeofgayshine]

You just explained thus better in a 13 minute video then my teacher has in 4 weeks. I have a feeling your videos are going to be saving me this year.

[@fakename3474]

Learned more in a 12 min video than I did in an entire year of public school...

[@surialpaca6542]

I am here because I have a stoichiometry test in 15 minutes. I love you, guys. Thank you, thank you, thank you. 😭😭🙏🏿

[@SuperNumber420]

The foundation of modern chemistry = many years of strokey beard meetings

[@haushinka502]

These videos are the reason that I'm passing my chemistry class.

[@taofiqlawal4917]

lol, nice dude =3

[@ShortiMac13]

Yessir

[@Johnathan19439]

Awesome

[@Spin2021]

If these videos had been around in 2007, I wouldn't have failed my AS Chemistry exam by 3 points, and my life would have probably taken a massively different direction.

[@Absenteeee]

Metric system is awesome. 1mL of water is 1cm^3 and weighs 1 gram and it takes 1 calorie to raise 1 degree centigrade... Idk why I'm posting this. It's just... why, America, why?

[@TheBlaze4000]

Fuck ur country. Come to Britian like me! Fuck tou Fucking minecraft fcker.

[@truman3047]

AMERICA! FUCK YEAH!!!!!!!

[@Absenteeee]

I -like- love America, I just have a deep distaste for our system of measurement

[@NoActuallyGo-KCUF-Yourself]

We'll get there. It's a slow, stubborn process, though.

[@murphybenton7791]

KZbin Comments Suck fucking minecraft fcker? not only could you not capitalize Minecraft, you also forgot a u. Take that, brits.

[@moorejim13]

You guys made a mistake. at 11:40 the 12 mols of O2 is supposed to be 384, not 348

[@TheBehemothGamer]

+Jsunshine013 I caught that as well. there is another error at 8:03 it says 11mol x 16.00 g/mol is 171 g, when it is 176 g. However, his overall calculation was somehow correct.

[@sophiaruizuvalle2523]

it's probably a typo

[@harmancheema7249]

I thought I was wrong thanks so much!

[@Lepord257]

This was so helpful. I'm so glad these videos exist honestly, my chem teacher somehow manages to make simple concepts super hard so now that we're at stoichiometry... let's just say I am super thankful that these videos are available.

[@christianpowell6263]

it is hard to focus on the material in the video because i am in awe of how much effort goes into these videos

[@colehuff3881]

Anyone else binge watching these before finals?

[@IcyLight98]

Got my chem final tomorrow.

[@maxrozmiarek5326]

Louie Lapat same

[@ashleeclifton4921]

CHEESYMONKEY I have my ap chem final tomorrow morning

[@absentjoji]

Same

[@aasthasharma3820]

i don't have finals I'm in middle school

[@blackbirdie8169]

"the mole is like our chemical rosetta stone" I really like the way Hanks talkes about chemics sometimes.

[@DCsk8rgoelz]

the way you built up to the explanation of the mole and actually included the connection between AMU and Avagadros number was exactly what I needed. Thank you crash course. Thank you for not making me a chemistry equation robot.

[@trixstix0910]

Next make a video about how to stay awake during chem lectures....

[@axelevensen1517]

Im studying for my entrance exams for university and this is helping SO MUCH. I haven't done chemistry since 10th grade. Thank you!!

[@weirderthan]

starting a crash course playlist at midnight is dangerous...

[@3rdeye7thdimension]

Did... Did hank just comment on the fidelity of a carbon isotope? That carbon isotope can bond with whatever it wants without your judgments!

[@marywalker793]

I don't comment on a lot of videos but this has without a doubt saved my grade in Chemistry! I am learning more from these 12 minute videos than I have in my entire Chemistry course. Thank you crash course, and thank you Hank!

[@ohayuhanna]

We worked on stoichiometry for a year in class. At the end of the year, there were still a significant amount of students who didn't know what a mole is or why a mole of an element weighs that certain amount. This video could have taught any student , who really wants to learn, all of that which they have been unable to learn in a full year, in 30 minutes and perfectly. Thank you for these videos. Your lively approach, organized descriptions and the amazing presentations work wonderfully together to really make education "come alive".

[@maddieverrall5694]

This channel is legitimately my favorite thing ever. Being able to A. Procrastinate my homework like I (stupidly) tend to do, while B. Actually figuring out what's going on in class, and C. learning by on of my favorite people in the world as I D. Can use it to actually do my homework for real is unbelievably fantastic. Thanks, Hank!

[@kozmo7]

I've never taken chemistry before so this series has been great, but this episode confused me. Something tells me I am going to have a rough time moving forward.

[@augustinejacob4995]

trust me it's alot worse in a REAL chem class

[@coloraturaElise]

We chem teachers don't usually throw this stuff at you until at least halfway through the year, so don't feel bad.

[@Valsorayu]

@@coloraturaElise Got thrown it at the start.

[@juliehartung9008]

I love these videos! He just explained in 12 minutes what took my teacher literally two and a half months to finish with, and he explained it in more detail!!

[@Fitzcarraldo92]

Hank, I am doing chemistry through correspondence and had studied for the unit 1 test using my readings and supplementing your course to help whet my appetite for chemistry. I ended up watching your entire chemistry series and went in to write. Unbeknownst to me I accidentally received the unit 2 test which I had NOT studied for whatsoever and finished it by grasping at topics I had remembered from your videos. I got a 92% on a test because of you and your brilliant team. Thank you Jasper

[@Drknot741]

I took AP chem this year and without these videos I would be completely lost. Thank you for making these videos!

[@pablorodriguez-wr1bl]

I´ve only been following you for 3 months and I have to say that i have learnt more with you than a whole year and a half with my chemistry teacher

[@slowmo8561]

If I really burn 5g of sugar every couple of minutes then I could eat the whole willy wonka chocolate factory in a day and chemistry says i be fine lmao

[@kgigjdjsuazhzhsnjszs]

I took my AP chemistry my junior year and watching all these videos helped me get a 5! Thank you so much ❤️ I’m currently re-watching all these videos to help me prepare for college lol

[@stephpies3]

I am taking the PCAT today and I am using this as a refresher for general chemistry. Crash course is a lifesaver!!

[@ivyrudisill4389]

This is the only way that I can feel prepared for my tests. I feel like I remember so much more from CrashCourse that I do from worksheets and practice problems.

[@dsettleascii]

Words cannot describe how much i hated this in chemistry

[@aidansherwin3872]

lol got my final tomorrow still cant do it, this is my last hope

[@mytzenka6574]

I have to admit, I find the first type of mole - the tunnel digging kind - easier to understand.

[@famichelle6728]

I feel like a part of you made this video to justify adding another packet of sugar to your tea. Even if you didn't, I'll definitely use it as such.

[@sian_nyan]

Next time you eat sugar: hyperventilate

[@michellewu6689]

I know I definitely will. High five.

[@MultiPianolicious]

I have watched soooo many videos on stoichiometry, and this is the first video where I actually understood what’s going on completely

[@Sarebearrable]

Currently using your videos to refresh over quick general chemistry for the MCAT. They’re fast enough that I can watch while I eat or during my scheduled breaks! Crash Course far exceeds Khan Academy...much more exciting and full of meaningful images to help teach you through everything! Thank you!

[@sammylg22]

Hank, I love your creativity, hilarity and wit in every one of your videos! I sometimes wonder what the process is for making these. I can see how much you effort and dedication you put into these videos, and your passion for science and teaching. Although I cannot remember even 1/3 of what I'm initially taught in class, I've come to really enjoy chemistry because like you say, it is the foundation of everything. I'm taking chem 100 in college and I believe I'll be watching these until (and after) I graduate. I'll also be showing these to my future kids, and by that point we'll all be old fashioned. Also, where is that shirt from?

[@Random_Limo8051]

Crash Course is our quarantine savior.

[@TheWhiteRhino98]

12:46 Video told me more than one hour and 30 min of chemistry in high school. thank you KZbin

[@gabijagorobecaite8037]

You made being a chemistry teacher a lot easier with these videos. THANK YOU!

[@Tomisi94]

The method of teaching you use in your shows makes it easy to follow up and understand. I only wonder if you can try and give some form of exercise, so we can practice what you taught us.

[@joshcoonhoodpranksgonewron3542]

You saved my chem grade this whole year

[@izzyluca4711]

I'm in 7th grade and I can completely understand this guy. He does such an excellent job explaining the topics. I just hope what I'm learning now will stick because from what I've seen public school chem. teachers don't seem like the best and I want to be prepared.

[@DiegoLopez-eo7xn]

Thank you Hank really. I never understood my chemistry teacher and I WAS lost on this part of the course. Thanks to you now I can easily understand what it is about.

[@AlexisGelinas]

I liked this video a lot better than the previous one explaining electrons. I get math, but electron shells and orbitals are confusing!

[@aabhinnav]

Alexis Gelinas visualize orbitals in three dimensions. It might help.

[@tom-cr3cn]

Alexis Gelinas nah its extremely easy

[@mr.visualstudio8029]

yeah, that vedio was a bit way too complicated for a 7 class guy

[@TheNoobPube]

@@tom-cr3cn sorry big man

[@tom-cr3cn]

@@TheNoobPube why you apologizing fam

[@Legacytierstrategies]

The best way to approach stoichiometry in a few easy steps..1. balance the equation (if its not already) 2. convert the amounts given (usually grams) into moles 3. while everything is in moles you can determine how much moles would be used or formed for the compound in question. Straight forward. No confusing conversion table. Your welcome.

[@mikwons]

ugh my chem teacher takes points off if we don't use that stupid conversion table. I wish I could just go with this.

[@andie_pants]

I think the thing I admire most about Hank is his elevation of trolling to a fine art form with a skill and subtlety that would have made Mozart blush. Especially knowing how a lot of high school classes watch these, he walks right up to the edge of a dirty joke, winks, and walks away. I love it!

[@shawnthesheep2369]

I have a chemistry final tomorrow ;-;

[@TheGCinc]

I have one tomorrow and I came here to figure out stoich

[@joshuabeddall9816]

I have a quiz tomarrow

[@gurman8803]

well ik im 3 years late, but still how did it go?

[@sparklingstarsforeverinthe493]

Freddie Mercury don’t worry , Yesterday was new year for me 🤣

[@shuu3034]

Did u graduat4

[@RubixCubist]

12:06 Hank: how do I tea

[@Ella_Neruda]

Hi! first of all I would just like to thank you guys so much for captioning your videos! I don't know if anybody else with Auditory Processing Disorder is watching this but if you are I would definitely recommend putting on the captions and playing the video at 0.5 speed. it may sound like he is kind of drunk but it really helped me :) at first I couldn't understand a word he was saying because he talks so fast but after I made these changes, I finally understood. Hoping to ace my stoic test tomorrow!

[@conchgirlmallory]

Watching these videos while taking my college chem class is so helpful! Thanks Hank!

[@stanstantalent.5605]

Chemistry is like poison to my brain, no matter how much I try I can't understand it. ;-;

[@GregTom2]

And the medal for the least insightful figure of style goes too... Bilal Abbas. Because indeed, no matter how much we try, it's difficult to understand poison in our brain.

[@stanstantalent.5605]

I guess I should've added that I take AP chem 2, which is considerably harder than the regular one. (Figure of style?)..・ヾ(。＞＜)シ

[@ProfessorSyndicateFranklai]

Don't worry, like arsenic, eventually you'll build up a tolerance to that stuff. Drink up!

[@GregTom2]

Sir Francis Actually you don't build a tolerance to arsenic. Arsenic is a heavy metal, and heavy metal poisoning builds up over time to kill you slowly. It was in fact the advantage of that toxin in the renaissance era; the fact that it would seem like a slow death to disease. The only things you can build a resistance are the receptor mediated toxins, or the toxins that can be flagged and destroyed by the immune system; something like proteins. Definitely not arsenic.

[@ProfessorSyndicateFranklai]

Although of dubious source www.strangequestions.com/question/620/Can-you-build-up-a-resistance-to-arsenic.html I'd think you are right though, not safely.

[@user-fl8cd8dm2b]

nothing was understood by me

[@SMFAHgirl98]

I cried during my last chemistry test. Hopefully this will help?

[@pamelamondragon4023]

Me too just now once I realized how bad I did

[@jessetheskaterkid13]

OK I have just realized something about these videos... They are designed for use in reviewing the material, not learning it. I'm trying to learn chemistry before taking it next semester, and I noticed that everything is covered so fast that I sometimes have to go on other videos where they explain a specific process more slowly. But still, this is of great help.

[@heather9276]

Great video! So glad I stumbled across your channel! There is a typo at 11:40 as 12 mol of O2 is 384g (as you did say), not the 348g written on the slide.

[@nannaprimdal]

Can someone make a video explaining these videos lol

[@ProfessorSyndicateFranklai]

1 Mol = 6.022 * 10^23 1 Amu * 1 Mol = 1g The rest is just application and utilization.

[@hashbrown7078]

Bless this channel for helping me understand things that I don't when it comes to science

[@jean_ramsey]

I have a horrible chemistry teacher who barely teaches anything and when he does, he goes so fast I can't keep up, let alone understand what is being taught. Thank you for making these videos so I can finally understand chemistry!

[@medjed2511]

My biology teacher wrote an equation that wasn't balanced and it feels the same way to me how you said an unbalanced equation is like saying mommy and daddy love each other

[@himrqwerty]

at 11:38, he says 384g of O2, but it displays 348g. We were so confused!

[@somewright4440]

These videos are amazing! I took chemistry in secondary school, but this series had helped cleared up what I misunderstood :D

[@sp-xi8kl]

Woah! This video is just amazing to watch with all the interesting stuff the guy explains.

[@coltrane1331]

At 11:37 12 x ~32 should be 384, but it says it’s 348g. 12 mil of O2.

[@erictaylor5462]

You can make sugar a lot more interesting by adding yeast. Let the yeast eat the sugar then you can drink the waste product (yeast poop?) to make your party time a lot more "fun". Please do not attempt driving after drinking too much yeast poop.

[@yikesmcgee1283]

Wait... this comment is a bad idea... audience is probably 90 percent high school students.... that mean you might have just told people how to spike punch at prom

[@Will-vk9th]

im studying chem with you Hank, i love your work!! i hope i will pass the CLEP test for chem when i finish studying with you!

[@ashwinirajkumar8007]

this video was very useful to brush up my basics!! thanks guys for such wonderful videos!!

[@aaronrobertson6708]

I just learned more in 12 minutes than I learned in 12 weeks.

[@gaviningram-childs1749]

To this day crash course is better than my teacher

[@ruchaghadge2270]

seriously, have been struggling with stoichiometry and your vid helped a lot. just did a problem and I effing solved it so THANKYOU!!!

[@thespidermanoftheottomanempire]

Hank Green I have the worst Chemistry Professor in Ireland and you are my Saviour. May Avogadro bless thee!

[@venusmichaelajackson5606]

@CrashCourse, There's a problem with your video sort of like a "typo" or "ERROR. The answer for the solution of 11moles of oxygen multiplied to 16.00 grams of oxygen instead of coming up with a total answer of 176g of oxygen in your video it was written 171g of oxygen. nevertheless the answer is correct but I hope you can fix that, because it might confuse other viewers. Thank you!

[@ariaa.9428]

7:58 I have a problem here, 11x 16.00 does 176 instead of 171. I don't know if it's just a mistake or there is something I am not understanding quite well. Do someone knows what's wrong?

[@jacobmartinez9791]

Thank you this helped me out. I needed a quick refresher before my final.

[@kalyugherp]

Thanks for the efforts... All the basics of Chemistry explained within 13 minutes.

[@nadinefrescura4366]

It just makes it better that John Green is his brother. Fantastic family. I love Crash Course, literally use it for every subject because my teacher's are duds.

[@gabrielblack5805]

6:23 "How long is that?" That's 10,570 light years. Or about 10.5% as wide as our galaxy.

[@DarkRose77100]

Short Concise and Understandable. This is what I call useful.

[@SirenLemanyOfficial]

Hank, you should do a whole crash course of Physics because I'm taking that class next year and I'm dreading it but your videos always help me out when I'm stressed

[@kerokerobonita]

11:42