Alkenes & Alkynes: Crash Course Chemistry #41

Today Hank talks about the deliciousness of alkenes & alkynes, their structures, and how to remember which is which by simply knowing the alphabet. Also, he breaks down hydrogenation, halogenation, polymerization, and triglycerides all while helping us figure out the meaning of different names for fats.
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
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Table of Contents
Alkenes & Alkynes 1:14
Naming Rules 1:39
Cis-Trans Isomerism 3:29
Hydrogenation, Halogenation, Polymerization, and Triglycerides 4:40
Meanings of Fat Names 5:50
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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

[@brandonbell5456]

I'm havin Alkynes of trouble with this one O.o

[@calebtimes453]

Brandon Bell O.oooooooo

[@AbsaluteWreckage]

good one

[@rohancr8485]

UwU

[@vigneshmuralidharan]

well played. ,-,

[@victorma9355]

U came here just to make that joke didn’t you

[@lifewithep]

anyone else crying because organic chem??

[@catlover-fp5ig]

My exam is tomorrow, and I can't rote learn to save my life . . . I'm so screwed *cries*

[@copycat487465]

how did you do on that exam?

[@hopeg6817]

Mood

[@mohitberi8355]

so are you fine now?

[@carlasalas1932]

Ugh yes, this is literally what everybody dreads and makes them drop from their majors or switch!! ESPECIALLY PREMED!!

[@keru1668]

Don't you love how Hank sarcastically says "If you paid attention" before "you have learned today" :)

[@TheSpore35]

Who ever does your animation does a fantastic job!

[@tidescent]

I feel like fewer people would complain about Hank's speed if Crash Course had better English subtitles/closed captions. If you'd like to help replace the auto-generated subtitles with more accurate ones, please click the gear button at the bottom right of this video, navigate to the subtitles section, and click "add subtitles". By doing this, you are contributing to Crash Course and unlocking content for the hearing impaired!

[@meilei8]

+James Miller i did some but not a lot cause chem test haha

[@tidescent]

Correctrix If these videos were slower (and thus longer), then they would fail to fill their niche. It is called Crash Course, after all. Perhaps pausing, taking notes, and reviewing is the way to go if you want to really absorb content. Salman Khan of Khan Academy has repeatedly acknowledged that the freedom to learn at your own pace is what sets video based learning apart from traditional lectures. While we're on the topic of getting content to sink in, subtitles are great for that. You can pause and reread what was just said until it really sinks in. And if there aren't any subtitles yet, writing subtitles would be a great way to review what you're learning while simultaneously helping other learners! How's that for being awesome?

[@michellekarr9150]

The fact that more people are complaining about the speed than saying "Wow, that's great!" says a lot. If I have to pause a video two dozen times and rewatch sections 4 or 5 times, it's not serving its original purpose either: the kitch is overshadowing the purpose. Inevitably, after 15 minutes of trying to watch 4 minutes of video, I bail. I've never been able to finish one; which sucks because the content isn't bad and it's a subject with which many need help.

[@jokar1013]

James Miller I've never understood why people complain. I've learned English as a second language but I understand Hank perfectly.

[@varshachaudhary9367]

James Miller thank you

[@fauzanb4592]

As a student, I liked crash course. However, as an educator, I wish it could be more understandable by beginners. One way you can confuse people less is by adding subtitles. I find subtitles helpful in understanding fast speech.

[@kristianhopkins776]

You can turn on subtitles via KZbin

[@megancooke7592]

I pretty much always have subtitles for Crash Course Chemistry. Including this vid. Possibly / probably even the other subjects. Maybe check your settings. Too be honest though, I'm a teacher too and have also found that these vids are not great as an intro for the kids. (There are tons of other fab vids though). The general feedback, for me anyway, is that Crash Course goes a little too quickly for them and covers too many topics in one sitting when the topic is completely new. Having said that, these vids are pretty awesome when putting things into perspective for the kids, once they have a basic understanding that is. My students absolutely love the practical applications highlighted by the CC team and their general style of teaching. It also totally helps motivate them to be more passionate and enthusiastic about the content, and learning in general. I mean, how could you not be with these dedicated nerds? (That was definitely not meant as a derogatory term btw, and the synonym options are super lame. I am too and proud to be one;)

[@stellarfirefly]

I've always wanted to change them to "alkanes, alkenes, and alkines". That way, other multi-name systems can follow the same rules up to 6 modifications. For example, if there were six different alk- types, the remainder could be called "alkones, alkunes, and alk-sometimes-y-nes".

[@garethdean6382]

My chem teacher asked me if I could convert long chain hydrocarbons in short chain ones. I told him I didn't know but I was willing to give it a crack.

[@allanabraham1127]

ok

[@SpicyGelato98]

Lol

[@victorma9355]

I get it not funny tho

[@schlondpoofa529]

HHAHAHAHAHAHAHAHAHAH

[@dhivyanawesome5939]

Its a pun for those who can't understand that

[@crashcourse]

***** talks about the deliciousness of alkenes & alkynes, their structures, and how to remember which is which by simply knowing the alphabet. Alkenes & Alkynes - Crash Course Chemistry #41

[@igneous_flock]

***** No, that would generally be a bad idea for numerous reasons.

[@sameerathreya9253]

+Alex van de Sandt Hank please make a botany Crash Course too!! I didn't like the biology one, 'cause it didn't have proper illustrations and seemed quite 'dry' to me. Sorry, Hank. Please remake it..

[@iradha3035]

CrashCourse

[@iradha3035]

CrashCourse

[@iradha3035]

CrashCourse

[@killerassassinx5x]

My 9th grade Chemistry teacher taught us that it was Alkines, not Alkynes. But I'd rather trust Hank's word than my teachers.

[@moonik665]

Both are valid, well, at least in Polish. :P

[@tomalator]

my chem teacher as well as the entire state says alkynes

[@natasalegenic5860]

depends on where you're from here it's also sith an i

[@KatherinePierce_81]

Hank is right

[@tudorpamfil4622]

Wtf, in Canada we learn organic chemistry in grade 12 xD

[@Majoranza]

I love you Hank Green... you continue to save my life even in college. Sincerely, A dying ochem student.

[@lifeofeddy]

Hank, Kahn and Frank saved me in failing school

[@harry_page]

Ari Sylafeta Filthy Frank

[@copycat487465]

what about Patrickjmt?

[@longnguyenson646]

+lifeofeddy who is Kahn?

[@chiamakae6416]

what is frank's channel?

[@feodorasiahaan4892]

They crashed your score when you go to crash course

[@mirandakreta5917]

It's so much fun to see you truly passionate about organic chemistry (partly because it's my favourite). And hearing you pronounce the very distinctly greek words that I have learnt and am learning....

[@theendoftheworldhasbeenqui2485]

this might just be a coincidence but when ever a new crash course is uploaded that is what i learn at school the next lesson,I'm thinking conspiracy

[@cjdixon6573]

I am taking this dreadful class now, and I'm going to need you to do more of these videos.

[@loganeder306]

Hank, I was literally in the middle of reviewing my orgo for my final later this week when I received the notification for this. Perfect timing, I can't thank you enough for all you do!

[@michaelreyes1719]

This group really helped me after stopping for 2 years in school it helped me remember almost everything. Amazing

[@Cassie_28]

Thank you so much for making these videos. I've been sick and missed a lot of classes and I have a test tomorrow on this stuff and I knew zero about what the test is on before watching this and now it kinda makes sense so thanks!

[@nutritiongemRD]

Starting Ochem this Fall and trying to get a head start. You guys are awesome!!! Thanks so much! Will definitely get on that patreon thing soon!

[@psychopurple]

I'm looking forward to any videos coming up dealing with NMR and X-Ray Crystallography. I have an exam coming up in January, and they'd be amazing tools for recalling what I've been studying. There's just so much!

[@Dhavanie]

Your videos are life saving!!!!!!!!!! Thanks a ton for uploading!!!!! They help me so much for Chem and Bio.

[@riyadriyad8480]

6 weeks of studiying and i didnt understand but 9 minutes saved me cause i have a test tommorow

[@ags3006]

Before watching this video I had no idea of the difference between (mono/poly)-saturated and trans fats. Awesome videos!

[@aidasaad97]

YOU ARE THE BEST. You literally serve raw information on a plate of gold. Thankk youu for saving my life :')

[@kendo512]

One of the best of the series so far

[@sudangampoopun2251]

I look forward to watching next episode. I will have the test about organic chemistry this Monday and your clip make me understand it clearly. Thank you very much

[@Tahoza]

This video was excellent. Interesting. Informative. Efficient. Good job guys, keep up the good work. I like the higher calibre of educational KZbin show. It's great to feel challenged by a video's topic, though admittedly my background in chemistry is a bit lacking... hence why I'm here...

[@DouglasSantos-cp3dm]

Thank you! I'm so glad for having found out about crashcourse!

[@deedee3287]

Crash course is an awesome thing to watch during my spare time.

[@themachinehead4421]

Diana Egbunike Ikr

[@RWayneG]

Love all your videos! They are super helpful! thanks sooo much :)

[@HavokTheorem]

I really like these videos. Khan Academy taught me all the academics of o-chem, the lingo and the systems and such, but didn't delve into the practical uses and changes like you do. Good stuff.

[@iutub3923]

This is one of the greatest channels on KZbin! This stuff is fascinating....and...ehm....useful for Thursday's class test! XD

[@romantheflash]

This is helping be understand a lot more of biology then I previously knew as well thanks Hank.

[@rijumondal6876]

you are a ray of hope for mastering science in my unscientific education system!!!!! hope one day i will become big enough to donate a healthy resource to your startup!!!

[@lameasspistachio]

I love the speed super good please keep it

[@musaddiqofficial7655]

I really like the way u guys explain and edit ur videos

[@duhaelbashier9303]

HANK GREEN IS SOO AAWESOME, he is funny and made it interesting. I honestly love him

[@bertiliadesun2449]

your tutors are great! they're really helpfull

[@hamzaislam6096]

Thanks very much Crash Course for the video.

[@freddythobhani6181]

according to new iupac rules it should be but-2-ene

[@kiwichi4488]

Yep

[@ThisIronDwarf]

+Freddy Thobhani but then they've also changed trans and cis for E and Z

[@adamantium7]

It creates less ambiguity when you get into the nomenclature of more complex organic compounds (for example, ene-yne hydrocarbons).

[@akolovechoco]

Yes!!! I've been confused of this but-2-ene thats why i came here and NOW IM MORE CONFUSED Haha.

[@chemlad9495]

It's definitely a lot more clearer using the but-2-ene style, but it only really becomes apparently when you look at more complicated, substituted molecules. For example 2,3-dimethylhex-4-en-1-ol rather than 2,3-dimethyl 4-hexen-1-ol. It makes more sense for the location of the double bond to be next to the part of the name that tells you it has one (the 'en' in this case).

[@paperchristine]

The big differences that little changes to a molecule can make are fascinating and occasionally terrifying. My OChem professor told us stories of medications that could kill or cause terrible problems when their mirror images (enantiomers) were used instead/as well.

[@conorbenstead9185]

I have a test on these today. I love you Hank!

[@icanhazADHD]

I have a final on this stuff tomorrow morning. Thank you so much!

[@huntermartin8848]

I love this show, it makes me look like a genius in my science classes.

[@sunshine0805]

I learned more in a 10 minute video than I did in 2 years... Teacher why?

[@blockhook]

+Yasmine athira same for me. but then again the reason why this video has become more effective than classroom is because i had prior initiation to the subject. having the topic said in this light only gives a very much firmer grasp

[@arijitdas7107]

Apparently your attention in class was somewhere else otherwise you must have sitting in some wrong subject's class

[@JorgCAlexander]

I'm gonna have to sit down with these videos when I have a spare week and watch them while taking notes... Dat Chemistry is getting real

[@dawn899]

WOW! studying for my final... super helpful.. I have to listen to it like twice cause of how fast you talk... but very helpful... thanks!!!

[@eclairee97]

If only there's crash course for physics too... ._.

[@camerondavies1233]

Melissa Andrada you get your wish

[@NikNik-bg7ex]

Melissa Andrada there is

[@ImJustDrifting]

There is...now..since 2016, this was commented in 2015

[@eclairee97]

Haha but it's too late for me now since I'm not taking any physics-related subject... but still yay!

[@katherinethomas3654]

Man...this is the first 2 year long comment to respond to someone. And, sorry it came too late. :(

[@mdromit37]

This video was really helpfull, it was so much easier to understand than the lessons I got from school.

[@JoanneSheppard]

This is literally came at the perfect time! I'm struggling with this in class at the moment and have a test tomorrow. Thank you so much!

[@SkywalkerAni]

On the subject of trans fats and food, there's a cooking show I love called Good Eats. It describes the science of food as well as cooking, so you might like that if you're into that kind of thing.

[@user-lv7bo3bc8d]

Nothing's boring about chemistry, Hank! D:

[@CaptainObvious0000]

yeah? try the maths part of quantum mechanics.

[@almanacization]

CaptainObvious0000 you kidding? That's like the best part!

[@LanttuLoL]

CaptainObvious0000 Boring or difficult?

[@CaptainObvious0000]

Rūdolfs Treilis if you have a ph.d. in quantum physics or physical chemistry and therefore understand enough. otherwise...just no.

[@CaptainObvious0000]

LanttuLoL both.

[@Aibanez90]

I feel that I know so many random facts because of this channel.

[@bellerilley5618]

wow, this was brilliant, thank you!

[@icecoldjam5706]

bloody life saver for my test Thank You Crash Course

[@cryotheotter4411]

Our Chemistry teacher is not very good at explaining this, so these videos are of great help. Thanks a lot!

[@jommydavi2197]

I clicked away from this video more confused than when I cane in.

[@piscesangus]

It gave me alkynes of problems too

[@FROPDESAI]

piscesangus YOU! You are awesome!

[@sinansenocak]

really? i freaking love these videos! but maybe you have to know some of whats said to some degree beforehand. I understood all of the video and im not even a native speaker. he speaks very clearly and at a good pace. my only problem with this video was (since im watching it for my high school chem exam) the fat-stuff was unnecessary since i think its not taught everywhere, so i half assed listening that part lol

[@lt.pineapples8772]

+Jommy Davi CANE CANE CANE CANE CANE CANE CANE CANE CANE CANE CANE CANE CANE CCCCCCCCCCAAAAAAAAAAAAAAAAAAAAAAAANNNNNNNNNNNNNNEEEEEEEEEEEEEEEEE

[@science-y9209]

@@sinansenocak I'm in high school too... and honestly i ain't learning for exam rather it's for my interset .. so it's kinda like okay i love it

[@Scorpiofurry]

Where was this when i needed it for class lol so informative and much better then listening in class

[@valentinbelii5308]

Totally awesome videos!

[@elnazemdad5946]

I have exam on Thursday and this exam is a life changing! If i pass i will go to the medicine department and I wasn’t understanding anything about chemistry and all these stuff till i watched this video! Hope u keep this work up please! You don’t know how much you help everyone! LOVE U LOTSSSSSSSS

[@ianabajian3549]

I love the new addition of the Hemingray Insulators, Hank! I have to admit, I searched long and hard to find the Laboratory Lamp you have on your desk for my home office, but I never thought you'd have the insulators like I do! You made my day.

[@ruanjoanna4524]

Thank you crash course you are saving my life

[@MZOURI8]

The best educational channel on youtube

[@am7504]

my head hurts but a lot less after this, thankie hankie!

[@akilakavisinghe7189]

He should have talked about Markovnikv's Rule!

[@zoraizmohsin935]

Akila Kavisinghe i know im replying late but dat name is a mouthfull man

[@IWantToStayAtYourHouse]

Dont think its really that necessary to know

[@diamondgelato]

Meh...people would faint even trying to grasp that stuff

[@CaptainObvious0000]

my master thesis was about alkynes (/ alkyne moiety reactivity)

[@psark]

I understood more in this video than in class. My teachers(class and coaching) both taught alkanes and told us to do alkenes and alkynes ourselves...

[@14Squeaken]

JUST IN TIME FOR MY ORGANIC CHEM FINAL YES! THANKS HANK!

[@thunderbird1105]

Let me start off by saying, thanks for these videos, they are incredibly informative and quick. I love them. But all I'm thinking while watching this guy it that : He needs to play the Doctor. He needs to be the doctor, probably the one after the next after peter capaldi. I want to see this dude listed as the 15th doctor. That's it. Start practicing an English accent dude

[@merdershewrote371]

I was thinking that too!

[@davidb573]

Kevin Marshall Lol I was just thinking the same thing. thing is though, he would kinda look a lot like matt smith as well as his characteristics

[@vickylikesthis]

awesome job, crash course!

[@vladimirwilliams2517]

Super informative

[@purpleluver811]

This is a Iife saver while reviewing for finals thankyou

[@dudecurly]

Please make this a full-fledged Organic Chemistry CrashCourse!!

[@erinmayo5170]

I'm supposed to be sleeping but I love chemistry so much that I have to binge watch these videos

[@annamcquown4656]

This is a great video!

[@yvettemejo3519]

Thanks very helpful !

[@albusg93]

awesome video !

[@jeonghanniest]

I've been waiting for organic chem vids since last semester.

[@naldesprince1921]

helped a lot thanks!

[@pallavirsp5459]

sir ur explanation is really marvelous ......

[@jackhazzard2453]

Good short from of organic chemistry revision

[@samanhs1143]

wow although he talks too fast but I loved his videos. it helped me a lot to remember only innone day all I ve studied many years ago.

[@BreakyTime]

learning org chem to make soap and know what im doing, these videos help so much. thanks!

[@klaik30]

Is there extended song of the intro song? :) I really like the tune

[@Harveytown01]

+klaik30 Darude - Sandstorm.

[@DrewKF]

+harvey mccartney YES!!! That's the caring, sharing, DFTBA attitude :D

[@icefirexd]

it helps, i was reading a book and i couldnt understand it since am self reviewing :3 much tnx

[@johnfei434]

Good review.

[@audreypalmier2471]

Great sigma and pi bond explanation 👌❤️

[@TheAdamant94]

I always like the oranges and lemons example for stereoisomerism. It really shows how biologically important it is.

[@HeisenburgJehangiri]

helped me today. Papers in 3 hours. Thanks

[@nishatlala3990]

Thanks dudeeee this helps

[@lyzh4288]

OMG Thank you so much!!! This helped me a lot!!! And all this time, I think the person talking was John Green. Thanks anyways!

[@ezchem3139]

Well explained

[@giahuyha3597]

You save my organic chem test :)) Tks a lot.

[@ameynanote]

OH THANK GOD THIS EXISTS!!! I KNOW HOW TO AT LEAST PASS NOW!!

[@dclarion]

When I studied organic chemistry (20 years ago), I learned that the π bonds in a triple bond combined to form a cylindrical shell, and that it was unknown whether there was rotation about this bond. When and how was this discovered to be untrue?

[@alondraur4495]

Thanks Mr. Green!

[@ViniciusRochaMida5]

"and our graphics team.. is thought cafe." I love this.

[@amithsaranyuds861]

Hank Green you are a genious.

[@vaidikshah910]

Nice one

[@fathima.ranwar1657]

chemistry exam tommorow!! thanks +Hank Green