Bonding Models and Lewis Structures: Crash Course Chemistry #24
ฝัง
- เผยแพร่เมื่อ 7 ก.ย. 2024
- Models are great, except they're also usually inaccurate. In this episode of Crash Course Chemistry, Hank discusses why we need models in the world and how we can learn from them... even when they're almost completely wrong. Plus, Lewis Structures!
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
Models 0:06
Linus Pauling & The Bonding Model 9:16
Lewis Dot Structures 4:27
Ionic Bonds 5:30
Covalent Bonds 6:10
Double Bonds 7:17
Triple Bonds 8:14
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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
You guys did something that school failed to do... I learned something.
Right there with you.
You won't get a highschool diploma from youtube.
ScienceBang I got the IB with TH-cam...
Phrzzy that's what I'm trying to do rn 😂
ScienceBang its a good cram option for a chemistry test though
when you are crying watching this the day you have your chemistry test (':
dude, so much relate i can't even. i actually feel like there's hope for my test now 😹
Lmao 😂😂😂
The feels is strong within this one
we're all so predictable
Same I have mine in 6 hours 😭
I know you guys get this very often, but thank you so much. Chemistry doesn't come naturally to me, and you guys present the information in such a simple and straightforward way. I've always thought learning was fun, but you guys make me enjoy even the hardest subjects (to me). Thank you for doing this!
Hey i watched your channel playlist
You have some good taste in sound😊
ruth rodriguez and with the playlist i agree with you on chemistry may mass times accleration be with you
And hey subscribed your channel see there your first suscriber😄😌😌
And last question : In which grade are u?
Please do a video on VSEPR theory
Noor Rana yes please
Noor Rana Please I would love this!
Noor Rana there is a guy named Tyler Dewitt who has a really helpful video on it
Yes please!
We actually do need it
I learn more in a ten minute youtube video than I do in an hour and a half of chemistry class..
freaking seriously
i love the way they also include the history of chemistry. it gives viewers a chance to go deep into the world of chemistry. by sparking curiosity. Very well done. inspiring
"model students"......*gasp* so he knows that all the people watching his videos are stressed highschool students who are cramming for their tests the night before the test?!
Not all of them I'm actually a high school student but I ain't stressed out about an exam and this stuff is not in the program I learn in School well most of it isn't at least. it's good to learn
Luo Tianyi literally doing that RIGHT now
wail rimouch waaa wht a neard 😩
sanjana zarin thank you
sanjana zarin wtf what did you even learn at you're english class?
Can you please do a Video on Vthe VSEPR Theory and Molecular Geometry
+Kainat Fatima PLEASE DO!!!
+Kainat Fatima
Yeah- I dont understand that stuff.... :(
please :)
Yes!
yess plzzzz
I agree with many people here. I've read chapters, studied slides from lecture, and completed the practice sheets and I would still get caught up on this simple subject. You guys simplified it to my full understand in just 8 minutes. Amazing!
I know half of you are here cause you guys have a final tom
How?
Case caro isn't it obvious! :P
Obvi...
2 finals actually
yeah,who else searches for lewis structure on youtube...? *sighs*
As a biochem major who's a little nervous about tutoring General Chemistry I next semester, I really appreciate this video (: great video layout, Hank -- thanks a lot!
THANK YOU! I was so lost, im not a chemist im a mom whos going back to school to get my bachelor's. I was scared I wasnt going to get it, and you really helped me so much... it finally makes sense
I looked at this video and saw "Hank" in the description. I was like, Hank? Like Hank Green? Naw...
Then OMG! Hank! Automatic attention getter: being taught chemistry by one of my favorite youtube vloggers. Thank you!
Thank you for helping me try to pass my exam
Key word try
*flails hands*
YOU SAVED ME FROM FIRST EXAMS WEEK FOR IN PREPARATION FOR HSPT!
*praise hand flails*
FOR THAT I PRAISE THOU
Imagine finding a fellow Len lover here under a chemistry video. XD
_Oh whale den, I see you know me. 7v 7_
*we will take over the world*
When I get stuck with chemistry, I come here for a mental break and a different perspective on the topic at hand. Thanks for being so good at providing both!
You guys are the only reason why I'm passing chemistry, so I thank you.
"Doing whatever models do on saturday nights" AKA enough coke to kill a horse
KET
It's hard to comprehend everything you are saying when you speak so fast. Not everybody is a natural with molecular geometry, chemical bonding and Lewis structures, so most of us who are learning appreciate when the information is slowed down. Thanks ^^
Jake Hawes you can slow the video down from the bottom right side prompts.
Congratulations. Not everybody is as fortunate as you with listening comprehension.
0:50 - the universe is weird
get it? cause hank wrote a song about why the universe is weird?
I don't even know why that cracks me up
I'm learning this in 8th grade and my teacher literally taught it for 1 minute. Thanks, you're a better teacher than my science teacher.
screaming right now.... less then 2 days before AP chemistry exams ;-;
funny thing is in my AP chem class when drawing Lewis structures we use lines to represent bonds. but apparently we found out the AP exam says those lines are 'too advanced' and will receive ZERO credit if you have lines in the drawing of Lewis structures
+TuZeref Weird... I thought the lines represented the structure of it after all. Maybe they're cracked.
This is a must-have channel. Great job. Do you guys have a Physics crash course planned for the future by any chance? Does anyone know an equally comprehensive channel for Physics?
Khan Academy. They’re brilliant
"All models are wrong, but some are useful."
-George E. Box
“There is no such thing as a quadruple covalent bond”
*Transition metals would like to know ur location*
there is also quintuple, and maybe hexuple
YOU ARE AN ANGEL. I HAVE A COLLEGE CHEMISTRY TEST IN TWO DAYS AND THIS IS HOW IM STUDYING THANK YOUUUUUUUUUUUU
Thank you CrashCourse!! You guys are literally saving me in my online chemistry class. I really appreciate all that you do to create such amazing and straight-forward videos.
8:48
Oh baby a triple!
GG m80
"It's important to realize that all models are imperfect to some extent"- that's deep
literally cramming 3 hours before my finals exam
me too!!!
I have a test in two days and I'm an ADHD student seated in the back of my class and all i have to say is *chef kiss*
*1:45** I throw my models of atoms in the air sometimes saying aeeeeeh ooooohh gotta let goooo.*
4 years later and these are still helping people. Thank you so much
"model students" (awkward sarcastic face) lol 10:50
The comparison between fashion models and scientific models was really good and helped me view models (both types) in a different perspective
I must say that u make chemistry look and easy.
your videos are helping me a lot
thank you, 2013 hank, for finally letting me understand lewis dot structures! my test is in a few hours, ahhhh
I am in a desprate need to someone like him to be with me in every lecture in every subject.
This show has saved my life too many times to count.
Hank, and all of the crash course team, you guy are like legit, the best. I praise you for doing this for free on youtube.
Hank Green, I cannot thank you enough for this video.
Thank you so much, Hank! These videos never let me down. I can totally count on CrashCourse when I need some Chem help. You explain things so clearly!
Thank you for the explanation. It was great.
You need to get your eyeglasses adjusted. You repositioned them 7 times during the course of your discussion. May have been 8 actually.
"What's eating Gilbert Lewis?" lol nice one, Crash Course
We are all model students? DOES THAT MEAN WE ARE NOT 100 percent accurate? :O
I would love to have a link in the description that tells where Hank gets his t-shirts! I especially like this one!
I still dont understand how do I know for sure when the atom form a single double or Triple covalent?
We often watch crash course videos because it's short to watch!
If you think that this show teaches you what school doesnt, you're wrong. All these topics should be covered in highschool. This is simply a briefing. Do not learn your highschool curriculum from this channel, please, learn it in highschool, however, this is still useful as study and review.
People are meaning that they learn better from this guy as he teaches better, but you're right on the studying part this guys perfect for studying
You're just jealous that he has more views on one video than you ever will on your whole website.
I still love your videos, though.
You did better than my professor in just a few minutes. THANK YOU!!!!
Hey theres something that confuses me. Why is H2O bent instead of linear? Should the H have bonds and the 4 dots of electrons be on the top and bottom of oxygen?
When you have extra electrons surrounding the central atoms the un-bonded electron pairs repel the other atoms attached to the central atom (in this case the two hydrogen atoms). Because of this its electron shape and its molecular shape are different.
Steve Gerrish Thank you, I appreciate you answering my question
s-media-cache-ak0.pinimg.com/564x/fc/3c/59/fc3c596e2c4306c838f5f27f015a7fa7.jpg
check out this chart, the blue spheres represent electrons surrounding the central atom you can see how they take up space and therefore repel other bonded atoms surrounding the central atom.
Thanks! This really helps my studies and makes it easier to understand
Calvin Malagon having 2 dots or electrons is called a lone pair
While water H2O consists of 3 atoms it might be linear or bent
The central atom is O and has two lone pairs one at the bottom and the other at the top
The rule says if there is a lone pair(s) in the central atom when the compound consists of three atoms it will be bent
CO2 is linear because the central atom carbon has no lone pair. I hope that u got the point mate :)
U choose ):)
I owe this guy a life debt. I have a chem exam tomorrow and he's saving my life (did the same fro bio last year)
9:00 My PhD in Google tells me you're wrong
You guys were really helpful, considering i went from 40% in september to 65% in November 11th grade, and all of a sudden i have a weird feeling of buying my own very little Trebuchet
I don't think laughing like this because of that last joke is healthy...
What?
So glad you make these videos as my chemistry teacher is a shocker!
Oh hank you say the sweetest things ;)
When your teacher doesn't give a damn so you have to watch TH-cam
I don't know what I'd do without this. My Chemistry book told me to write Lewis Structures, and I didn't even know what they were.Thank you Hank.
I love these vids
I HATE THESE VIDS
Deni Ferchichi WHAT'S YOUR PROB
Myself 16 years old:- what do I prefer to learn, English or Chemistry? English so I can talk with people around the world!
18 year later... Using English to learn chemistry for a bachelor's degree I need to start a business I love XD
Chemistry is the best part of science!!
This video is magnificent! I have learned more from you in 11:38 than I have from my teacher in the past two weeks. Thank you!
If only you taught at my school
This is the first NOT-BORING Chemistry discussion I have ever seen in my entire life!
This guy is replacing bill nye
Caleb Soliday That guy is called Hank Green
Hank could never ☹️
Never
you are my hero. I have a chemistry test tomorrow and I finally understand !!
I have an EOCT tommorow
don't blink, you'll miss the whole video
all the cuteness he compared a bond to sharing a snack
Hank needs to stop wearing awesome shirts so I can keep my mind on chemistry instead of, "Where do I get that awesome shirt??"..
You can probably get a lot of them on the dftba records website.
I'M A FRESHMAN IN HIGH SCHOOL DOING COLLEGE LEVEL CHEM. I HAVE NO IDEA WHAT I'M DOING. GOD BLESS THIS VIDEO.
I am a middle school student doing high school chem with an EOCT tommorow. I have no Idea what I am doing. I feel you fam.
I'm in elementary school doing college level chem. I fell you bro.
I have a quiz on this tomorrow, plus homework. 😂
Make a physics crashcourse
@0:53...."the universe is weird" holly god...his expression...luv that xP
Aw, I wanted Brazilian models :(
8:59
Oh yeah! Quadrople Covalent bonds bois!
only 5 min in did he start actually talking about them wtf
Thank you so much. I’m currently using this to study for my midterm.
Where'd he get that shirt
Elijah Hawk I am wondering the exact same thing!! I need one
CrashCourse Tell Garrett Ruskauff and I where you got that shirt!
Elijah Hawk dftba.com
Garrett Ruskauff you can get it from dftba.com
Hey guys! Listen up! Here's some shortcuts to building Lewis Structures or Skeletal Structures (those are more Organic Chemistry...they are the ones that look like lines and pentagons and hexagons). Assuming all atoms are neutral, Carbon will always have four bonds, Nitrogen will have a single lone pair the three bons, Oxygen will have two and two, and halogens (F, Cl, Br, I & At...not that you'll ever see At) will have a single bond and three lone pairs as they are more electronegative and thus rather grabby with electrons. Now, if there are formal charges, which are basically like charges in general but internalized inside the molecule, that changes things, but not too much.
Positive formal charges makes Carbon act like Boron with three bonds and that's all. Nitrogen will act like Carbon with three bonds and no LPs, Oxygen will have Nitrogen's bond configuration with three bonds and one LP, like in the Hydronium ion. Halogens will be two and two. That's all for positive formal charges.
Negative formal charges move things in the opposite direction. BTW, it helps to visualize this on a table. Perhaps when/if any of you take Organic Chemistry your textbook will have such a table. Anyways, negative Carbon will have Nitrogen's bond config with three bonds and a lone pair. Nitrogen will be like a neutral Oxygen, Oxygen will be like a halogen with a single bond and three LPs, and if a halogen has a negative formal charge, then you have an ion, and thus a net charge as well.
Hopefully this will help you guys. Two LONG semesters of Organic Chemistry...not once did I need to tally electrons when building Lewis/Skeletal Structures.
"Nitrogen will act like Carbon with three bonds and no LPs"
ACK! Four! A formal charge on Nitrogen will result in four bonds, and no lone pairs of electrons.
Wow . you talk sooo fast . I had to pause to understand some of it . 😅 Thanks for sharing !
CrashCourse is wonderful especially as a supplement to my irl chemistry class because it simplifies the information load without losing anything important or sacrificing the ease with which the viewer is able to understand it. Clears up so many things my teacher glosses over!! Thank you!
Lol he talks really fast
you should see John from Crash Course World History
Lower the playback speed, idiot.
This is the first episode in a while that I've watched in its entirety! I'm a humanities person, so this stuff sometimes doesn't hold my attention, but it did this time! Thanks, Hank!
Why don't quadruple bands exist? Why can;t there be a quadruple bond of carbon? C2
cuz logic
A neutral C2 doesn't actually usually exist. Usually it comes as acetylide which is C2(2-)
But why
Electrons like to spread out when possible. Having a quadruple band would mean all of the density is at the center. Although achieving an octet is desirable, electrons also do repel, thus at that point your repelling force is greater than the force of bonding.
Thank you so much!
I feel edyamacated now, lol. I took 6 years of chemistry in high school and yet I am baffled that I don't recall a single thing despite having gotten Bs and Cs consistently. Thanks, Hank.
great teaching . but you can you please talk little slower
lol That's how fast they talk in crash course😂
NOoo, i love the fast talk, thats how i learn bestestest, u can rewind, but if i speed em up, they sound like chipmunks : (
If you want it slower click the little gear icon on the lower right of the video and change the playback speed! :-)
Ray Tedder That makes Hank drunk. XD
Ray Tedder HAHHAHAHAH omg distractions.... I want to change playback speed on popular youtube vids now. That is more distracting with this video though :-) Glad for the info though.
this is really helping me study. i have exams coming up and these videos are the only way to keep me interested, and i love the little random facts that I find so interesting that i haft to think about them more.
Can you be my teacher?
>Saw this during a Science lesson
>Switched to Personal Account
>Subbed
I like how this information is delivered! Keep it up!
2019?
Hank Green, ladies and gentlemen, always saving my notes from complete anihilation. Seriously, man, you did the impossible: YOU MADE ME UNDERSTAND CHEMISTRY!
I'll be honest I don't feel like this fast talking zip through crash course if of any help at all. There's tons of other videos where they will explain it slowly and carefully, step by step. I can't keep up with this motormouth, he whizzes through topics as if he were explaining something that we already have a working knowledge of.
You guys are amazing. I would have failed so many exams if it wasn't for CrashCourse.
I'm a model and I find this offensive.
If you think I'm serious than get off the internet because the internet is full of sarcasm
Is it weird to watch these for fun...
YEA ITS FUCKING WEIRD MAN
Daniel Valencia NO ITS NOT FUCKING WEIRD MAN. ITS FUCKING AWESOME.
Naw man, it's completely normal.
Omg I wish you wouldn't speak soooo fast!!!
Lol, you can slow down the speed of the video... so long as you are on a PC...
Tried that now he just sounds drunk lol.
Desertholic lol... That's something I never realized before
+Desertholic lol
There's a setting on TY where you can make the video slower or faster. It should. Hope it helps.
a tip for finding out covalent bonds: 1. add valence electrons, 2. if the atoms were noble gases, add the electrons they would have eg H-2 F- 8, 3. subtract the noble e's from the valence ones and divide by two. This makes sense because the noble electrons are the ones you don't have (so you must share) and each bond has two.
you talk very, very fast.
+Shivanshu Siyanwal And then he sounds soooooo stoned
+Arthur V. Prevatte AWESOME!
FANTASTIC! I watch it at 75% speed, and some times at even 50%...., and super speed problem is solved☺️👌 (thanks from Spain!)