Enthalpy: Crash Course Chemistry #18

[@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

[@johnursino6416]

"Haiku's are easy, But sometimes they don't make sense, Refrigerator." Awesome shirt.

[@rafadnan9796]

i love how he says "if you were paying attention, you learned" knowing full well half of us zoned out and have to re watch it

[@rnercibelle]

Enthalpy @ 3:10 Calorimetry @ 5:30 Hess's Law @ 7:20 and 8:20 and 9:15

[@theultimatereductionist7592]

Thank you!

[@deekshas3936]

Thank you!

[@allmight6725]

Thank you!

[@XDhinchman]

Learned more in 11 minutes than in 2 hours in lecture for Gen Chem. Thank you

[@DarkRose77100]

Yeah no Joke.

[@muhammadfaour3211]

Daniela Hinchman ikr😂

[@Vasanth_3]

really, i guess it will not be as, some of the deep things can be thought by your lecturers, only.

[@thomasbybjergbrock2227]

I love what you do! But, this time a few errors slipped in, so let’s correct them: Two things: 1st thing: @7:22 you have a slide that lists the Standard Conditions: T = 25 °C C = 278.15 K P = 1 atm = 103.25kPa That is a slide with a couple of whoopsies, that mainly look like typos in the temperature, it is split on two lines and 273.15+25=298.15, not 278.15 in the pressure 1 atm = 101.325kPa not 103.25kPa What I think the slide should have said is: T = 25 °C = 298.15 K P = 101.325kPa Sidenote: there are several standard conditions, the one referred to in this video is SATP - Standard Ambient Temperature and Pressure, but I can see how this distinction is unimportant for this video. 2nd thing: @10:16 Hank says: “All that energy locked away in chemical bonds and then released as heat to my aching frozen fingers.” I have to take issue with this phrasing, as it perpetuates a common misconception, that energy is stored in bonds; thus, breaking them releases that energy. That last part is not the case: Breaking bonds require energy. Forming bonds releases energy. If you look at the reaction equation @9:22 4Fe+3O2->2Fe2O3 you can see a net gain of bonds. While all bonds are certainly not created equal, the heat to Hank’s hands comes from the formation of bonds between iron and oxygen, not from the breaking of dioxygen bonds or metallic iron bonds, unfortunately his sentence implies otherwise. I am aware this video is over 4 years old by now, but I still hope it will make it to the CrashCourse people. If you are not such a person, and still read all this, please like to increase the small chance that it gets seen.

[@maderaverdes]

*equal

[@RecurRealmST]

Kelvin*

[@RecurRealmST]

Pressure*

[@simrangill3299]

@Finn Molloy 298.15*

[@oweneby3116]

Shut up nerd

[@theinsignium1921]

Hank's Law: 'The number of Crash Course videos watched is directly proportional to the grades on the chemistry test"

[@hoeraufist]

These videos aren't the reason I'm passing chemistry. They're the reason I have an A in chemistry.

[@TheEternalMoonlight]

These videos are the reason I'm passing chemistry....And the cute redhead that sits in the second row.

[@hoeraufist]

I've got the same problem in another class. Cute red heads, man....

[@bananarama3624]

In my country A=Achieved and is the equivalent of passing So when we say we passed, it means we got A :D

[@Vasanth_3]

but how do you manage to get marks in numericals? I dont get marks in numericals.

[@Vasanth_3]

what is your country dude?

[@avacuneio1588]

When you gotta teach yourself because of COVID-19

[@ameliacarlan4240]

who else is cramming before assessments?

[@SpeakEzy]

you have no idea

[@sniperzBAK]

AP chem test tomorrow

[@geishecheryl3373]

haha SAME

[@dylannguyen4045]

Dude me too and I'm a sophomore kill me

[@mdmobashshir432]

yupppp... 04:16 AM here.

[@madyrangel696]

well...midterm tomorrow. all i can do at this point is ask for prayers, friends.

[@kombat4135]

Did you pass?

[@kenaylebarbare883]

@@kombat4135 I was about to ask the same question!

[@malshammarii2000]

Am I late to ask?

[@xJoeysWorldx]

@@malshammarii2000 yeah probably

[@JosephBeckW0W]

Hank I have never loved your nerdy face more than I do right now. I've been cramming for this Gen Chem test all night and you have probably just saved me from myself. I owe you buddy.

[@Marie-hu7xd]

I had 4 lectures on this stuff, 2 seminar sittings and spend about 4h trying to understand this with my notes and textbooks. And then i watched a 10 minute video and am wondering why everyone explains this so complicated in the books and lecturs! Honestly, if I pass this exam tomorrow, its only because of crash course! It is so satisfying to actually understand things!!!!

[@nostalgia_provider]

after watching this i feel like youtube is gonna help me through my university studies. very helpful and it gave me a motivational boost of interest to keep on studying! thanks!

[@TheSpecialJ11]

+Nihar Baijal Yeah. MIT OpenCourseWare is a great resource.

[@koi_A4]

I feel pity about me that you are learning this in university but I'm learning this in highschool and confusing about enthalpy and losing my holidays.

[@nostalgia_provider]

12123 yurana just first year biology, so i don't even have very advanced chemistry ;)

[@koi_A4]

***** I'm G12 and learning this in Japan's international school with Ontario course, which I'm not native but doing this incomprehensible thingy.

[@Ureyeuh]

I'm in BIO105 and this is really helpful.

[@tenelord]

I just discovered this channel, and this is probably the best lecturing i have ever seen. I think this is how lessons should look like even on colleges and universities. The fun stuff is what we need at classes, the rest we can read in books. Enjoyed it and looking forward to exploring the rest of the channel.

[@KayDeeKeySull]

Thank you for explaining the correlation between delta H and q. I didn't understand it from my textbook and I needed it for homework. Hank, if you are reading this, you and your writers are amazing and thank you!!!!!

[@hassansaqib13]

I wish that one day some brilliant student who learned Chemistry through your lessons would discover a new law and name it after you. You really deserve it Hank..... U must be a genius for explaining us chemistry through 10 min videos which our stupid teachers couldn't do in hour long regular lessons

[@keeganmaloney3440]

If I discover a scientific law I might just name it Hanks law.

[@kshitizsharma5903]

Yeah, That would be original

[@whitneykaye]

@Rowan Brown WELL I WOULD NAME IT HANK GREEN'S LAW

[@ranaastitva6917]

Green's law would confuse ppl

[@just-bee-lieve]

fuckin fight me Hank green I'm gonna grow up and find the volume of the goddamn ocean

[@elroyscout]

You want a graduated cylinder for that or what?

[@just-bee-lieve]

+Christopher OBrien if it can be supplied, then yes please.

[@meepmerp1562]

+adam c i bet you 1 million you wont find it in the next 10 years

[@meepmerp1562]

+adam c NO EXTRAPOLATING

[@jade43296]

+adam c The volume of the ocean is ~1.332 billion cubic kilometers.

[@smighterman]

This account is like a gift from the heavens. I honestly downloaded the all their videos, whether or not i have the course or not. It's fun to watch and at the same time very very productive

[@mitalipatil8068]

and the newly discovered element with atomic no.119 has been named Hankanium

[@meepmerp1562]

+Mitali Patil no element with atomic number 119 has been discovered as of today

[@meepmerp1562]

+Mitali Patil This element probably won't be discovered, it was a miracle enough to get 118. Most likely, the next element that is stable is 132

[@meepmerp1562]

??? i require evidence of such

[@meepmerp1562]

??

[@nh-a6713]

+SwenglishGamer it was a joke

[@renee1508]

Please do some physics crash courses!!! I really need it 🙏

[@Vasanth_3]

there are also physics videos.

[@HilbertXVI]

Vasanth Kinda trash tho

[@ewoleseo]

Shining to the rescue

[@ewoleseo]

I mean shini

[@tuckerjennings1816]

PBS space time is pretty great

[@MeganSchwarze-iq8kt]

Crash Course coming in clutch during finals season! Thanks Hank!

[@russ1618]

Thank you, thank you. What my instructor could not communicate in two hour long lectures, you made intuitive in less than fifteen minutes. Bravo sir.

[@yoqiu_]

I wish so much that John Green would be my AP chemistry teacher

[@alannabunny]

This video features Hank Green, John's brother.

[@yoqiu_]

+Breezy Starmeadow Ah

[@GlamGoddes101]

Same! I take AP Chemistry too and my teacher just doesn't know how to explain things well.

[@makennacook1110]

+GlamGoddes101 same here.

[@varshavijayakumar3069]

User I think you mean Hank...

[@sanderdegroot144]

This video series allowed me to understand everything I missed or forgot in AP Chemistry back in high school three years back. Cool!

[@OriginLegend]

Since my final is this week, Enthalpy is a friend I am going to try very, very hard to understand...

[@wildmarauder]

Hank, I wanted to let you know that you and John here at CrashCourse have helped me. With your abundance of (long) videos, I'm not only learning by listening in at random parts, but your voices help calm my anxiety and it's basically like listening to calming music for me. Thank you! xx

[@TheAltvZ]

I swear....learned more stuff in 10 mins than 100 hours in lectures!!! Hats off to #crashcourse (y) !!! Ye are just freakin' awesome!!

[@KiwiCutieX]

I love all these videos, the science I learn in school only focuses on the basic rules and doesn't explain why the formulas work and it's frustrating. With Crash Course, I can grasp it better because it's not just a bunch of numbers, letters, and symbols. Also, I have that shirt, and my English teachers love when I wear it.

[@ObaydFox]

"IF i am reckless and insane"? Why is there an IF there...

[@nafrost2787]

Wow this is ridiculous. I am a high school student and I have a few friends who study chemistry (and I don’t I study physics), I remember that a few weeks ago they had a test coming up, we were in a classroom, and they were on the board writing equations. I had no idea what they were doing, but now I do they did this calculations this is ridiculous with a few episodes of crash course chemistry I understand in chemistry about as much as a few friends of mine understand from studying it in school for a year and a half. Thank you Hank I’m so much smarter because of you.

[@spencerace7167]

I love the arrested development reference. And I love the video. This whole thing is just really good. Especially as a recap for finals. Thx guys

[@Neura1net]

I'm so happy that you're not afraid to use formulas in your videos. I'm gracious for the trust towards the audience.

[@pigslayer275]

Chemistry = Confusing fun stuff. :)

[@jshatzman]

Gaa! Really confusing because of the math - the rest of it REALLY is fun though, right? to bad I'l failing the class :(

[@pigslayer275]

You'll be fine :) The math is easy depending on the way you think of it

[@nathangjelsness9911]

She might fail English though...

[@Lazy_Desu]

Nathan Gjelsness lol

[@Lazy_Desu]

***** ...right

[@DoctorThomasElliot]

Great episode. My physics professor never bothered to get the idea of enthalpy across which made thermodynamics harder to figure out. You cleared that mist that surrounded enthalpy. Thanks a lot.

[@aretwodeetwo1260]

6:48 , when you were like "not bad", i couldn't help but laugh at that part.

[@KristyGeeWizz]

I'm sad that there weren't any dollar bills flying out of the banana stand. There's always money in the banana stand.

[@TheFireflyGrave]

Haikus are easy But sometimes they don't make sense Refrigerator

[@imabetterpersonnowipromise7261]

Your haiku makes sense But don't joke about a fridge I prefer freezers

[@doctorcardio1559]

Haikus are quite rigged They never make sense silly Dab on em haters

[@Ash_Queen16]

Doctor cardio Fix the first line and then your haiku will work

[@aerobyrdable]

@@doctorcardio1559 My experience? Most Americans' haikus Use the word "haiku".

[@CoalChrome]

@@aerobyrdable They usually are meant to not make sense People generally don't understand them the P R I U S has found me

[@lasharn07]

I have an engineering exam tomorrow and I was just revising this as part of my biology and chemistry course. What a coincidence this happened to be in my subscriptions box.

[@sophiewhite7180]

thank you!!! this is so useful for my AS Chemistry

[@joyceosejindu8998]

OMG same!!

[@mothermahapp5338]

How is it going, senior?😏😏

[@magicringgirl]

Why does this channel not have more views? These are all so amazing!!!

[@niyathi64]

Hank: Explaining stuff about enthalpy Me: Trying to read this T-shirt XD

[@Shubham_pandey-nk1un]

Excellent Video . I was struggling with this enthalpy for over a couple of years And you just make it clear in 11 minutes Thankyou very much

[@jesninee]

loved the arrested development reference

[@jamesgreydanus4676]

+jesninee I thought that they were "a huge mistake".

[@jamesgreydanus4676]

+James Greydanus I'm sorry about that...

[@domz4964]

+James Greydanus There's always money in the banana stand!

[@jamesgreydanus4676]

Dom Z My brother actually saw the actor who plays George Bluth at star wars Force awakens opening and said that to him. xD

[@4thVietCity]

+James Greydanus your brother is a legend!

[@kaylinbaugh8633]

Cramming 2 minutes before the AP test. This is the epitome of life. Thank you school system.

[@paulw1504]

The kelvin you used for the standard enthalpy is incorrect. Standard enthalpy is 298.15 K not 278.15 K.

[@CuttingEdgeSchool]

Thank you so much. I'm from India and it's a boon to have an advanced online series of Chemistry

[@torig7402]

Thank you so much for these videos. Totally helped me study for my AP chem exam!

[@drewliedtke2377]

So I'm a ceramic artist an I typically fire with wood. I am taking all of these videos and using them to better understand why and how materials respond the way they do in such a volatile atmosphere. Keep up the good work.

[@rileytesman1054]

Shout out to Michael Bluth's Banana stand...

[@enesulker6947]

good

[@smokiedapoo2]

This is by far the best explanation of enthalpy and state function. Better than textbooks!!!

[@MrFlyingLamma]

Watched this in AP Chem today, aw yeah.

[@andrewpersaud4144]

thank god for youtube. 12 chapter exam wednesday dont have time to read the textbook to review. videos like this are nice to bring back everything fast.

[@PMoney365]

I am sure this has been said before somewhere in the comments but at 7:22 it should be 298.15K (not 278.15K).

[@GeldarionTFS]

Good catch! It is the difference between "standard conditions" and "standard ambient conditions." The former is 1 bar and 273.15 K and the latter is 1 atm and 298.15 K. Because he was using Standard Ambient Pressure, he needed to be consistent with his temperature.

[@minaandersen252]

this channel is ten times better than my teachers. Thank you.

[@walter8154]

AP chemistry stresses me out

[@dylanmcloughlin2187]

I use these videos more than my Chemistry textbook. Thank you so much.

[@snailsinmypurse]

All I could think of when he said "Better living through chemistry" was "Better living with Collins and Collins"

[@zam2266]

dude you're the coolest scientist and best teacher I've ever listened to. Congrats and keep up the good job!!

[@brookebarcia5251]

You are hilarious and just brightened my day of studying! Loved the "Can I just go look at pictures of cats now?" !!

[@SoulEaterTV101]

I am very young and I don't know much about chemistry and science but by watching these videos I have seen that we don't know very much about our own world.

[@ranjanviper]

At 7:24 seconds the temperature in kelvin is not correct. The video is really helpful. Keep up the good work!

[@repentwhileyouhavetime.4239]

ya... its C = 273.16 kelvin

[@alexjhonson3335]

Im so glad my chem teacher found this channel since watching these vids before class is now our homework

[@Arthera0]

Dear CrashCourse people I think you made a mistake or 2 at 7:23. If I am not mistaken it should be: C= 298.15 K and P = 1 atm = 101.325 kPa. I know it is not a huge problem but maybe people get confused.

[@andrewpersaud4144]

+Arthera lol just saw this too. its definitely 298.15

[@shauryat5270]

+Arthera He messed up the C but he rounds kPa if you look at his previous vids

[@Arthera0]

Aurya T The kPa is wrong it should be 101,325. If you round that number off you wouldn't get 103,25.

[@saricity980]

haha im surprised you even caught that, cuz of how fast the video goes

[@MudRock1221]

that was almost a perfect summary of the second half of of my Thermo II class in Mechanical Engineering. well done sir

[@rynsawyer4185]

"Today we shall answer it! Kinda!" Hank has the best quotes xD

[@donnabrunner6654]

This helped me understand something that has confused me since high school science (20 years ago), Thanks H!

[@bellante8401]

"can I just go look at pictures of cats now??.,/,./" Hahahaha Hank knows his audience

[@TheLmaoMaster]

Even though i already know all this stuff, I still find it enjoyable to watch these.

[@MrBlitz2000]

I needed this for AP chem...ugh.

[@dampcloth5769]

+Bob John i feel you bruh, i took the ap chem trap 2 when i picked classes junior year. RIP

[@thomasbui505]

+Bob John really? the class is pretty easy for me

[@MrBlitz2000]

Thomas Bui It's different depending on the school. For a school like mine it's the hardest class you can take.

[@thomasbui505]

Yeah, it's like the bane of everyone's high school career. So, there's that. And I just kind of understand it because of my high arithmetic abilities. You know?

[@MrBlitz2000]

Thomas Bui No. At my school it's harder. Even the super smart people have a hard time.

[@StarrDussteh]

Chemistry exams tomorrow on enthalpy. Hank/Crashcourse you are a lifesaver!!! THANK YOU SO MUCH

[@hydaromar6532]

Its good advice but can you slow down please, Would be appreciated,

[@Taishopony]

That's the beauty of using the internet and vehicles like KZbin for education; you can simply pause, replay, and review all of the material!

[@jora0302]

yeah. the point of these videos is to be fast. Just pause and play if it is inconvenient.

[@Bellyofthebeast6]

You can set videos to half speed on youtube.

[@TSK_Dillards]

Doctor Derpy I'm fine with the speed he talks but I wanted to see what he sounds like in half speed and dear god he sounds so drunk. Imagine Stephan Hawking drunk and his machine was drunk too.

[@Ravengal101]

Jack Xhemali This made me try the video at every speed possible and, my God, was it hilarious! He sounds the best fast though.

[@ludwigvdwest]

I just want to thank you and the crash course team for making my high school chemistry tests not that fearsome.

[@babyshark_dululutulu]

what is the name of the music that comes out in 0:12?

[@markbaron13]

Love that my love of science and arrested development could be put into one video

[@jacobh1995]

How'd you know that I was distracted and wanted to look at pictures of cats :O

[@patriciarocaroca]

Dear crash course, I don't think you know how much help this is. THANK YOU SO MUCH FOR THESE VIDEOS

[@CM610LLL]

Thank you so much for putting the bluth banana stand

[@DrFaustPhD]

Paco answered the question, but I wanted to point out that it wasn't a stupid question at all. It was a very smart question, and shows that you're thinking carefully and paying attention. Good job!

[@natasha8356]

Theoretically, would placing the substance in a vacuum mean that the enthalpy of the substance would only be made up of its internal energy, as no energy is required to displace the air particles (VP)?

[@lainstein1365]

This is way over my head, and I consider myself to be competent in many things, kudos to you if you do understand this.

[@laurasaur19]

Can you please make a video where you explain all this as if you were talking to a five year old? Asking for a friend.

[@elainew.5301]

Seconded

[@sahil_71hvs]

i can't believe these videos were made 9 years ago

[@KDG702]

AP Chem kids wya?

[@HetfieldAuditore]

got a midterm in 4 hours im soo fucked

[@dylannguyen4045]

Ken Gonthier what upp I have a fckin test on Friday and I'm a sophomore kms

[@Pauavi]

good luck tomorrow morning!!!

[@KDG702]

hey guys we made it

[@thanhhuynh8507]

Got a test tomorrow lmaoo

[@Nitiwire]

You're the only reason why I know what's going on in my chemistry class. Thanks so much!

[@markeyboi6545]

Chemists be like: What should we use to represent heat? I know a q! Ok, what about Enthaply?... an H!

[@salmayoussef]

I needed this for my chemistry exam, Hank. Which was this morning... When this was uploaded... I'm crying.

[@henryatwater3757]

Do a crash course physics series

[@way2rahuly]

You said it buddy!

[@ethanrichards3238]

Hey! Guess what? BAM instant physics Crash Course. Yeah you probably know this but they have a few episodes now.

[@pbroski92]

Strange enough that I understand all the concepts you talk about in English rather than in my native language which would be German. Guess that's a clear sign of good quality work you're doing there!

[@kayla153081]

Can you do some more high level chemistry videos (some relating to the AP chem curriculum) Thank You!

[@AtticusEdwards]

6:20-- Thank you for bringing him up in a chemistry lesson

[@termayo]

i thought that standard conditions was 298 kelvin which is 25 degrees , not 273 which is 0 degrees ???

[@joeashbridge8210]

This video has finally answered to me where the pV term in the equation for enthalpy went. Thanks!

[@JS-cc6dz]

I still hate chemistry

[@kingcalv10]

U need Tyler DeWitt

[@Brendead8]

Well maybe Chemistry hates you... in Soviet Russia.

[@mothermahapp5338]

I like it but I suck at it (ㅜ.ㅜ)

[@ArmaKiri]

Hey I hate chemistry as well

[@SublimeSportsShorts]

J S facts

[@salientsoul]

watching this at 5:30 in the morning, 8 hours before my final chemistry exam. Thank god i've already passed the course...

[@pikabunz]

Admittedly, I got distracted by Hank in the beginning. I thought his haircut in the vid made him look pretty hot lol.

[@NaseemKhan-zm2ix]

+Primrose Cuaycong u gay for that lmao

[@ANXYouTube]

+naseem khan So quick to call people gay you don't even acknowledge their gender

[@jerish2125]

That person could be a girl dude

[@pikabunz]

Naseem Khan Lol!! I didn't know I was a dude!! I got some soul searching to do XD

[@annmaryjose3729]

I did too

[@gabrocki]

...and I thought I knew everything (or just enough) about enthalpy and thermochemistry. I'm surprised how many new things I actually learned from this. Great vid as always!

[@ArchdukeVN]

Personally I think an element named after you is far more prestigious.

[@TheWolfgangGrimmer]

+Kyle Nichols Which can never happen again. EDIT: Nevermind, if one was discovered in 2010, I guess there could be more.

[@DrewKF]

+Ghost7856 2 in 2011/2012-ish and no fewer than FOUR are currently having their new name choices considered, to assigned later this year, after their (temporary/potential) existence being confirmed in 2015! :) edition.cnn.com/2016/01/04/world/periodic-table-new-elements/ ...then there's the quest for further discoveries beyond 119!

[@TheWolfgangGrimmer]

DrewKF I see. That's neat...

[@Romanticoutlaw]

I'll watch this again without music in the background but I just gotta say that playing spectrum while watching this makes it so pumpin'