Polar & Non-Polar Molecules: Crash Course Chemistry #23

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Molecules come in infinite varieties, so in order to help the complicated chemical world make a little more sense, we classify and categorize them. One of the most important of those classifications is whether a molecule is polar or non-polar, which describes a kind of symmetry - not just of the molecule, but of the charge. In this edition of Crash Course Chemistry, Hank comes out for Team Polar and describes why these molecules are so interesting to him.
You'll learn that molecules need to have both charge asymmetry and geometric asymmetry to be polar, and that charge asymmetry is caused by a difference in electronegativities. You'll also learn how to notate a dipole moment (or charge separation) of a molecule, the physical mechanism behind like dissolves like, and why water is so dang good at fostering life on Earth.
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
Charge Asymmetry & Geometric Asymmetry 01:33
Difference in Electronegatives 01:49
Hank is Team Polar 00:33
Dipole Moment 03:49
Charge Separation of a Molecule 04:12
Like Dissolves Like 04:41
Water is Awesome 05:10
Crash Course is on Patreon! You can support us directly by signing up at / crashcourse
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Опубликовано:

31 май 2024

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Комментарии : 1,8 тыс.

@crashcourse 4 года назад

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

@amandavitti6629 10 лет назад

Hank: "If electrons were teenage girls, flourine would be niall horan." Me: it all makes sense now...

@ayushipandey1083 5 лет назад

liked the video only for including niall horan

@taqdisansari8523 4 года назад

Too funny for the examiner. Dang this education system.

@lambtonchemistry4408 4 года назад

Amanda I see your spell check was not working. I wonder what kind of bread you can make with "FLOURine"?

@MCFLY4 4 года назад

cool

@aksharaa5376 4 года назад

apparently im not a girl

@Allisonlikescats 9 лет назад

I blinked and missed the whole video.

@InvinciblePepe 5 лет назад

You blink for 10:45 minutes?

@82kedarwakade67 5 лет назад

@@InvinciblePepe good one

@rtchemp 5 лет назад

Just adjust the speed to 0.75- thats what I did.

@jackknifegibson 5 лет назад

nobody is smart anymore, I'm doing college level chemistry and this is a good speed

@jackknifegibson 5 лет назад

Wow. Talk about a waste of your life.

@aimanbahrim1022 4 года назад

Eminem: im the fastest rapper alive Hank: hold my glasses

@Keallei 4 года назад

aiman bahrim beautiful

@catmouse2882 4 года назад

Busta Rhymes would be faster

@SVUfannyc 4 года назад

LOL i've always thought he can probably say 100 words in 2 seconds if he tried.

@kimmkhize532 4 года назад

@@catmouse2882 true

@daiwikdhar6464 4 года назад

It should've been HOLD MY BOND

@harrys_vodka 4 года назад

I feel like if more chemistry teachers referenced one direction I would understand everything so much more

@saturnus8187 5 лет назад

1- says one direction 2- i think about them 3- i research about their break up 4- i finish my research 5- its time to go to sleep

@ansa6874 4 года назад

Imagine dumping a bucket of water on someone and they just ...dissolve

@margueritechastain6093 4 года назад

Steve Anthony Teves the wicked with of the east

@IndigoMist44 4 года назад

@@margueritechastain6093 i thought it was the west

@thatweirdguywhostalkspeopl1908 4 года назад

Let me sum it up so you can let it sink in: Polar molecules: -do not have symmetry in their chemical formula -may be bonded with Hydrogen Nonpolar molecules: -Have symmetry in their chemical formula -may be composed of only 1 element -may only be composed of Hydrogen and Carbon

@mckenna8663 8 лет назад

Just STARTING to learn this... and this went SO fast - it was confusing. I think this is more for people who are SURE of a concept and just want to review before a test, than it is for those just learning about it and want to understand the concept from the beginning. I'll be back after I'm SURE of the concept.

@MrBlitz2000 8 лет назад

+Mc Kenna I use this for review. :P

@mckenna8663 8 лет назад

Bob John Exactly. As a review... not an intro

@SidPhoenix2211 8 лет назад

yeah, it is definitely helpful if you have some idea about the concept. me, fit example, am watching these videos to get a recap on what I wrote

@AvatardSwag 8 лет назад

+Mc Kenna I think Khan Academy does a better job of introducing you to new concepts, including this concept, because I found the Khan Academy one much easier to follow. There are no graphics.

@mckenna8663 8 лет назад

AvatardShwag The greatest Biology, Anatomy, & Physiology teaching videos I have found on You Tube are from a college asst professor out of California named Wendy Riggs. (Her channel is called Wendy Riggs) She explains things so clearly that I understand them MUCH better from her than with my college professor. Carrying a 98.4% in Anatomy and Physiology I this semester...and THAT miracle is pretty well because I found ;Wendy's channel... and, of course, LOTS of hard work.

@jRh0121 10 лет назад

Wish I could learn as fast as he talks.

@thehuman6932 4 года назад

I can....

@LBonk 4 года назад

Me, too...

@HighAnders 9 лет назад

too complicated, just gonna get that F tomorrow

@MsChantae 9 лет назад

omG lol

@rogueally 6 лет назад

mood

@alyssaortiz8037 6 лет назад

same

@tupusiafausa2825 5 лет назад

Did u get a F

@velocity2894 5 лет назад

HighAnders same

@onedirectionandpercyjackso3557 5 лет назад

Here again I came here thinking of studying And there's One Direction!Great wish me luck I have an exam.

@sashickgirl1 9 лет назад

For those who struggle with the speed of him talking try setting up the speed at 0.5 in the settings on the bar below the video + the bonus of Hank sounding vaguely drunk

@TlalocTemporal 9 лет назад

Sasha S For some reason, my setup totally ignores that setting. Must be Android.

@jessicaenglish9224 8 лет назад

+Sasha S haha 0.5 is way too slow, i think they need a 0.75 option!

@EmissKEA 8 лет назад

+Sasha S HAHAHA he does sound vaguely drunk! Hilarious!!! :D

@EmissKEA 8 лет назад

+Emiss esp. the line "[...]polar is in my humble opinion[...]" xD

@EmissKEA 8 лет назад

+Sasha S TRY TO SET THE SPEED AT 2.

@kirstymaaac 10 лет назад

The 1D analogy was superb.

@jocelyngarcia4633 4 года назад

Extremely

@singinglips92 8 лет назад

I came here to escape one direction and focus on my exam WTF YO

@harrystyles6264 8 лет назад

+Mary ikr

@kai4765 4 года назад

BRUH SAME-

@hiarchie 4 года назад

Killers: Using weapons Me, an intellectual: *Dissolves my enemies with water*

@kall3y 8 лет назад

so i stopped focusing on 1d to figure out what my chem homework was about and apparently i can't escape them help

@vulkin8824 8 лет назад

+Kalley Laso so ur an asian luver i see

@kall3y 8 лет назад

+JC Lopez what???

@vulkin8824 8 лет назад

Kalley Laso u luv asians judging by your picture

@kall3y 8 лет назад

+JC Lopez that doesn't necessarily mean i love Asians, i could just love the one guy

@vulkin8824 8 лет назад

Kalley Laso nah u luv asians

@ColonialFungus 10 лет назад

To those who are having trouble keeping up,(I am not making fun of I simply comment to offer advice), turning on the captions can help with absorbing all of the information. Also, get used to the fact that your not going to always get the concept the with the first explanation,(Especially with Chemistry and the b**ch particle, AKA the electron) and that is why the rewind feature should be used often. Another thing to remember is that this is meant to be an overview meant for consultation, not for in depth learning of the concept being taught in its entirety. I hope this helped.

@sunflowervol6722 5 лет назад

MY DIRECTIONER'S HEART 💜💘💖💞💗💕💘 *gotta love chem after this*

@coleallen9928 4 года назад

2:44 The two elements that are highlighted when talking about chlorine and bromine were not actually chlorine and bromine they were carbon and boron the symbol for chlorine is Cl bromine Br boron B and carbon C

@hilakleiner764 4 года назад

was just gonna say this

@kashshk845 6 лет назад

i love how hank mentions the boys in so many videos, you can try escaping but hank is the electron to the 1d atom that will attract u. SHOOK

@gustafson2016 9 лет назад

I actually like how he talks fast... It means I can learn more within a limited time space.

@peachtreemcgee309 9 лет назад

As corny as it sounds, I want to thank crash course a lot for chemistry because it helped me get through my chemistry exam when I was having a tough time studying on my own. They made it easier to understand and made it seem more enjoyable, thank yall so much

@truboo4268 9 лет назад

A ton of people would disagree with you, saying 'He speaks too fast'.

@vanessaleighton1545 9 лет назад

It helped me a lot too. I love CrashCourse!

@FraserSouris 9 лет назад

Bryan Cotto You can slow down/speed up the video on the computers

@leannekennedy6724 5 лет назад

Yo in the future you can do that on mobile too! 😁

@joanyou6254 4 года назад

@@leannekennedy6724 in the future 😂😂

@appealingbanana7463 5 лет назад

I think a correction is needed at minute 10:00. Green shoul've said: A molecule needs to have both charge asymmetry and geometric asymmetry to be **POLAR** Please certify if I am right

@jhazelvictorio 8 лет назад

When you're trying to focus on the video but MITAM ad keeps popping out on the side then suddenly Niall Horan came out of nowhere

@vulkin8824 8 лет назад

+Johmaelein Hazel um.. nah m9

@tina4211 6 лет назад

samee!!

@crashcourse 11 лет назад

Accurate. Thanks Jan. Sorry for the mix-up everyone, we will try to be more diligent in our proofing in the future.

@ashleycloud1567 5 лет назад

Honestly, people may find this confusing... but it helped so much more than my actual chemistry teacher. I leave class not knowing wtf is going on. CrashCourse helps put things into perspective for me

@silverstonestream5477 6 лет назад

I just needed to finish my chem hw and finally tore myself out of the 1D videos and guess what? Niall is back. Jesus help me. WHyyyyyyyy all I wanTED Was to fiNish my HW.

@mokyungsung3953 8 лет назад

I greatly admire the meticulousness of the animators to animate even the reflection of the flag pole against the desk.

@vedanttiwary2419 5 лет назад

I am watching this in 2019 and realizing how irrelevant and unrelatable the 1 direction references are even though they were the sensation of the time at the time of this video(5.5-6 years ago)

@Savethebees523 4 года назад

dumb comment in 2020. totally irrelevant

@prodigygetgud7921 4 года назад

Should have stuck to References of the Beatles, cant go wrong there.

@yashkatyan8214 4 года назад

@Olivia Saklofsky you are absolutely correct

@rationalmartian 4 года назад

Who? LOL.

@idkreallyknow7430 4 года назад

People a year ago would have never knew corona would be here to save us from school

@scargmedia1861 4 года назад

I discovered this channel a few days ago and I love it, but I feel there may have been a couple of fairly significant slip-ups in this video. Correct me if I'm wrong, but Hank says water is able to dissolve virtually anything remotely non-polar. Should he not have said that water is able to dissolve virtually anything remotely *polar*?

@jalboyhhome6691 4 года назад

I came here for one and one reason only. One direction reference. I don't even have Chemistry.

@courtneyh.7373 8 лет назад

my boys were mentioned. Who knew that Chemistry would be so awesome!

@sakurasraven 9 лет назад

I love the metaphor with Niall. lol The polar bears made me sad :'(

@yugen 10 лет назад

Change speed to .5 for best results.

@HUMANUSHABILITATION 10 лет назад

how so you so this?

@chmmooc9254 10 лет назад

Hilarious- well played, Dallas.

@yugen 10 лет назад

CHM MOOC lol he sounds drunk right?

@dawnfmEnthusiast 9 лет назад

i finally understand what he's saying now.

@philliproche2817 9 лет назад

i had no idea you could do this! so many potentially comical moments unlocked!

@shaunabushell9743 8 лет назад

Put your hand up if you're more confused now for having watched this video.

@alenakym1159 8 лет назад

kinda

@hahan9 8 лет назад

😭

@harshitakanal7411 7 лет назад

yeah :(

@shaunabushell9743 7 лет назад

hahan9 lolol

@shaunabushell9743 7 лет назад

I kinds get it now but no thanks to this video

@alialsouaijet5563 10 лет назад

These chemistry videos are great but real confusing because he is too fast

@yugen 10 лет назад

Change speed to .5 or .25

@RB-sx7my 9 лет назад

I can't concentrate when its on .5, it's like he's a drunk chemist it's hilarious

@Vinceyu-180 9 лет назад

Ruchelle B lol so true

@Vinceyu-180 9 лет назад

Ruchelle B do it on 2 omfg

@starbird14 9 лет назад

Epicness168 watch it on 2, and then 1 doesn't seem so fast.

@bananacanada25 10 лет назад

ONE DIRECTION AND NIALL HORAN REFERENCES. I CAN'T. YOU'RE THE BEST HANK.

@stevenethan4638 7 лет назад

Wait a minute candy bars, you know candy bars, they usually come in a wrapper, just like you wrap a Christmas present and Christmas happens when it is cold, cold as in Alaska and in Alaska there are Polar Bears....polar.. Polar Bears... Po... Polarity. Yesss.....I understood now.

@ufo717212 7 лет назад

1. electronegativity difference 0.5-1.6 2. geometrical asymmetry

@christietoole4279 5 лет назад

ukyee I thought it was 0.5- 1.9

@user-tw1mv5oy5h 4 года назад

ukyee waaaait our teacher says 0.5-1.7 hmm………?

@Emma-mx8lu 4 года назад

Frick I have to answer this question too

@TheWilkersonFamily 7 лет назад

These videos explain some concepts that I just couldn't fully wrap my head around by reading about it in the textbook. Thank you so much for clearing things up with this informative and funny video!

@tsingh6426 8 лет назад

Please do crash courses of physics! You're so helpful with everything else: pretty please?

@han-ht3dd 8 лет назад

+Tejal Singh they're starting one!!

@imagurd 8 лет назад

+Hannah Barth On January 29, 2016, the Crash Course Tumblr confirmed that the Physics course will debut in late March, hosted by Dr. Shini Somara.

@Halamadridistas 8 лет назад

+Tejal Singh Its up now, if you didnt know. :)

@tsingh6426 8 лет назад

+TwoTacosForPaco Thanks

@itsausername333 9 лет назад

NIALL HORAN OMG. i love you hank.

@surgedgaming7677 7 лет назад

I'm not zoned out or anything and I still don't understand what he's saying.

@samarhankir15 6 лет назад

You sir, increased my passion for chemistry even more and more! This was highly enjoyable, thank you!

@emilyparks8635 9 лет назад

The speed is challenging, but it pushes me to understand more thoroughly/quickly (even if I have to pause it to digest 3 seconds of info). I never really took Chemistry in high school, so these CrashCourse videos are saving my college butt! Thank you!

@TheRok 7 лет назад

People talking about “too fast”....it is a CRASH course, goddamn it; not a “Che-M-istry for Dummies” book.

@HercadosP 7 лет назад

you so mean Q.Q

@axlito666 7 лет назад

I watch this with the speed of 2 -_-

@mcflurryhazel3595 7 лет назад

Sacya Sayaca 2 what? mention the unit man!

@charlottedsouza2342 7 лет назад

shut up

@TheRok 7 лет назад

Mehveen Hussain 2x the normal playback speed! The unit is 2 sec per 1 sec of video time, for example.

@chloegranger77 6 лет назад

I rewatched this is it makes sense again. You retain some material from the first time watching, but a second time it is easier to understand. Thanks hank!!!! Saved my grade

@BenedictaEzike 10 лет назад

Love the way he incorporated one direction into this. Hhha! Didn't see that coming. Thanks.

@crashcourse 11 лет назад

yup. small mix-up with thoughtcafe! we've annotated to point at the right elements

@Lex_Quinn Год назад

I was really struggling with polarity in my Ap course but this finally made it click, thanks! :D

@JenniferPChung Год назад

This was VERY informative thank you!!!

@erickacruto6670 9 лет назад

Great, your better than my professor but you explain too fast I wish you can take it a bit slow. The speed is challenging though it makes me listen attentively. But seriously your awesome it's really a big help. Thank you so much. :)

@amberfonseca6340 8 лет назад

This guy has helped me through biology and chemistry for years!! HE IS MY SAVIOR!!!

@kayaeki 8 лет назад

You just made me fall in love with chemistry. Great job! You're videos are truly awesome!

@kelseybuxton8511 5 лет назад

This is awesome. I love your personality, it makes this all easier to listen to and UNDERSTAND. And yes, I had to watch it like six times before I got everything dialed in my brain.

@ViridisArborem 10 лет назад

I love Crash Course Chemistry. You guys seem to be picking topics that I'm currently studying at school, like in the last two weeks. Best exam revision ever :)

@abiomajor1046 9 лет назад

I survive off of these videos to learn things that my teacher fails to teach (basically all of it). I find the speed perfectly funny and it isn't a problem for me to simply pause the video, write a couple notes and continue on my way. Thankyou for making these! I watch a lot of crash course simply for the fun and interesting topics, or like now, to survive yet another year of school.

@luvmyfriends247 9 лет назад

This helpped me so much and wasnt a boring video that I would fall asleep watching. Nice! Loved it

@pranavivedula Год назад

This was really helpful! Thank you!

@awesomest230 9 лет назад

This is like a million percent awesome. The polarity of molecules and how they basically shape our biological lives is just. so. cool. DFBTA :)

@jc__-du6oq 7 лет назад

Still sounds like he's speaking another language.

@minabobina420 6 лет назад

Chemistry IS another language. I hella tripped when a tutor told me that its like we are learning another language. Totally changed my approach in how to study. I stopped trying to figure out why it is what it is, it just is. 🙄

@user-lp5jv8ct2t 6 месяцев назад

This is so wonderfully and clearly explained. Thank you.

@nathanielmunoz8211 8 лет назад

I have had this lesson in various years of school and each time, I return to this video. Great video

@ruisiliu3515 9 лет назад

Learning chemistry makes me feel like Heisenberg.

@Thelightsaver1 9 лет назад

Are you certain?

@ndarwi01 9 лет назад

I have an uncertainty towards your statement.

@henriquefernandes3447 9 лет назад

You're goddamn right!

@Thelightsaver1 9 лет назад

I'm glad a ton of people got the joke lol

@ClumpypooCP 7 лет назад

uncertainty principle ayyy

@Spycyzygy 8 лет назад

I think you should go over that H-Bonds can only form between H bonded to N, O, or F and nothing else

@djr5995 8 лет назад

+Rsaramallac Good point

@aksharabachu2375 4 года назад

I understood it and it was perfect. Thank u HANK

@Dewey3937 8 лет назад

Demasiado bueno. Well explained!

@planetexpress8125 10 лет назад

Chemistry, I think, is the most beautiful study, because it's study of everything. Hank made it to me even more beautiful.

@MagisterJake 10 лет назад

No, you're wrong. Physics is the most beautiful area of science, as it is the science that can explain everything, even Chemistry.

@planetexpress8125 10 лет назад

I like both, chemistry and physics, but for me they aren't so different. I like to think that chemistry is just a little part of The Greatest Science, called physics. And this part (plus quantum mechanics) is what I like in physics.

@gtd3765 10 лет назад

MagisterJake Actually I think you mean math (and I'm saying that as a Chemist).

@MagisterJake 10 лет назад

gtd3765 Math is the logic of something, whether it's real or not.

@TIME1minute 10 лет назад

MagisterJake nice try sheldon cooper.

@morganjones97 10 лет назад

This helped me soooo much. So much easier to understand than the way my teacher describes it. Thanks :)

@Ben-pu8qz 9 лет назад

Great video man! Learnt a lot from it despite the quick talking speed. Gotta pause and replay a few times, but worth since its so funny to watch at the same time also.

@chingalingaling 5 лет назад

I found that pausing the video and writing down main words with his fun descriptions has been a super good way of solidifying parts I was previously very confused about. Thanks again Crash Course! \o/

@vishrutgrover3608 4 года назад

9:32 "that's better" Me : 'Nooo, that's butter' 😂😂

@jenniferbaubie 8 лет назад

This really should be used in schools. Crash course is the new Bill Nye for me. :)

@onesummerday9716 6 лет назад

When i was watching this chemistry crash course back years ago, hank had only a hunder thousand views and i thought people should appreciate this crash course more. Im so happy each cc chemistry videos has more than a million views now.

@judy9218 6 лет назад

Thank you so much!!!! I'm trying to study this part recently and this really helps >

@crashcourse 11 лет назад

Annotated to point at the correct elements. Had a small mix up with the graphics team!

@ophekal 7 лет назад

I came her to study chemistry but found myself fangirling over Niall XD

@chrisvisser-fee2631 4 месяца назад

I am having the strongest Deja Vu, and realised I watched this a decade ago back in High School. Same dude a decade apart, still the first guy I go to for basic science to be explained in an understandable way.

@Ran6000 7 лет назад

I actually love this guy. He makes studying so much more fun and easy to understand. Thank you!!

@CarloCopier 10 лет назад

He's all over the internet..... I always happen to stun upon him...

@TeamMongProductions 10 лет назад

He really is

@MCFLY4 4 года назад

stumble**

@jwills1349 7 лет назад

Thanks Hank, you're a saviour

@jameschemistryaccount3316 Год назад

Fun video! I love the crash course videos, even though I’m used to them as history videos.

@mirabelle9969 5 лет назад

I love this episode so much!!! It’s my favourite of all!!!

@TheRok 7 лет назад

2:23 Best definition ever...of “hipster”. And hipsters will still...insist that's not them. As usual.

@everytime13 5 лет назад

I started this last week and I still am super confused.... HEY AND THE TESTS IN TWO DAYS YAYYY *throws science book out window* *jumps out a minute later*

@mak4192 9 лет назад

Thanks Hank!! This was incredibly useful for my upcoming bonding test!

@ptolemycleopatra 9 лет назад

Thanks Hank! I always read my textbook and take notes and then watch your videos on the same topic. They tend to line up really well and that's extremely helpful. While your videos don't go as in depth as a textbook does, they do help set a good foundation and a summary so I can build upon it. DFTBA!

@aravgunness2215 4 года назад

It actually helped despite all the comments saying otherwise. Good for me ig

@aretwodeetwo1260 10 лет назад

Guys there's a reason why you can pause/resume the video. if he goes too fast for you, pause the video, and then resume it again.

@nicolassardella7897 9 лет назад

This video was awesome, great job!

@cvwxk Год назад

I like the experiments you used in the video to show how the molecules worked!

@ambrose7196 4 года назад

2:13 hehe... id id. 1D

@weyheyhi 8 лет назад

niall horan HAHAHA

@rashmisgourmetcooking6714 5 лет назад

I KNOW RIGHT!!!!!!

@jennynicole14 8 лет назад

These videos are a great addition to my academic course! I love listening at 1/2 speed, slows down the material enough to really take in the information and a bonus it's no longer "crash course" more like "drunk science" ;)

@shailysharma4649 7 лет назад

u r totally awesome sir ... u make things so quick and clear that a person never lose his or her interest ... keep it up . just love to watch ur videos

@ImBiebersBarbie 9 лет назад

i was engaged at niall horan hahahhaha

@atinymulti 9 лет назад

Same

@Manabender 8 лет назад

0:33 I lol'd. But wouldn't it have become polar once the left head moved? It's no longer symmetrical!

@meganzaman8426 7 лет назад

Oh my gosh! These videos are a great find just before my exams. Hank, I think you may have just saved my chemistry grade with these great, easy to follow videos!