Yeah, okay...So he can't say nuclei...but I can say nuclei, and not have the faintest clue about them. Sal can do chemistry. I can't. That's why I'm here.

@vernalwarrior23

9 жыл бұрын

alessandro felicetti ^^^^^real talk. Same here man

Give him a break on the nucleuseses. We're sciencers here, not languagers.

@redmerdeboer1880

5 жыл бұрын

Scientists* linguists*

@03raq

5 жыл бұрын

@@redmerdeboer1880 WOAH you must be fun at parties

@dhruvavikas1632

2 жыл бұрын

@@redmerdeboer1880 lol

You're changing the world for the better. Free education, you deserve a Nobel Prize. Also, I really like how you personify the molecules. It really makes me feel like I have a personal bond to them. :)

Khan Academy being lifesavers as usual.

Attack is a sufficient word. I remember my ochem teacher drilling to us the concept that SN2 is a backside attack in class and 4 or 5 immature students couldn't stop laughing. Still kinda funny, ha.

nucleuses > nuclei

I thank you, your vids made it possible for me to explain Sn2-reactions to a couple of teenage girls i've spent about a month trying to teach em about organic chemistry, i more or less rephrased it to a story about a guy and two girls (H and Br)

seriously cant thank you enough for your chem vids. sooooo helpful id be failing ochem way worse then i am right now without these videos

Gosh how I'm so thankful to you! I've watched other vids for sn2 reaction but this video explains it best.

The confusion I had in class with SN2 is now clear by watching this video. Thank you.

I appreciate your guys' vids. I like the enthusiasm you speak with.

Wooow!!! I can't believe i was able to follow through 😱 Thank youu so much 👍👍👍

These are great! They really helped me before my ACS exam.

really thanks this was awsome! This and your atoher videos explaine things better then my teacher does and i am so happy that i found yor videos its going to help me alot !

I really appreciate your work, it's very helpful :)

> im not a greek scholar doubt it

Thanks. And also inversion of the stereochemistry around the central atom for SN2 reactions. Happens in one step. Different from the SN1 reaction that happens via a carbocation intermediate. SN1 occurs in two steps while SN2 happens just in one.

You are really doing students a service!

Truly helpful and thank you.

OMG thank u so much for this! I can finally understand it =D

this is so good. so useful for tmr's exam. thank you so much!

When people ask me what university i graduated from ill just say ''KHAN ACADEMY''

Thank you for the video. The structure drawn towards the end of the video is actually the transition state, not the intermediate. Transition states and intermediates are not the same. An intermediate would be for example the carbocation in an alkene addition rxn. They're much more energetically stable than transition states

i did an sn reaction on a secondary halide iodoalkane and the rate was almost instant. we concluded this was an sn2 reaction with psuedo first order kinetics dependant on the concentration of the nucleophile. nice illustrations but it can be much more complex than it appears.

idk what I would do without you, khan academy

You are really doing a service for students!

finally knew understood what sn2 reaction is :D thanks

thanx man.yours a great help think your Ochem videos will help me in cracking iit-jee

holy shit the buildup to that NUCLEUSESES was so hype. I loved it. NOT even gonna timestamp it for anyone.

I watch all of your videos for Organic Chem at my university, and I can't help but be mildly distracted by the uncanny familiarity your voice portrays with Tyrion Lanister...#GOT

@entertainingfootball4871

6 жыл бұрын

nlindor87 who are you??

Now, I'll never forget that nucleophile loves nucleuses! lol

"Will attack the Carbon... Or, I shouldnt say attack that sounds very aggressive" Lol.

Nucleuses hurt me, just say nuclei.

@zombiesalad2722

8 жыл бұрын

it's an insult of chemistry

@aadityarajbhattarai46

7 жыл бұрын

rohit choudhary So what good have u done to raise the standards of chemistry? better then sal khan?

@Wourly

7 жыл бұрын

Then you are a masochist, you don't have to watch this video...

@HHSMCJROTC

7 жыл бұрын

I loved it! just saying, but i also say things like "loudness" "rapidity" etc etc. i butcher english just cuz the language makes no sense anyway. i don't see why we shouldn't just play with it.

@snz8176

4 жыл бұрын

Zombie Salad who cares. It’s not about remembering and pronouncing everything flawlessly, it’s about understanding

You are wonderful! Thank you so much.

Keep up your amazing work

@princehamdan5813

2 жыл бұрын

Thanks for your unconditional love and support 🌹🌹🙏🙏🙋🙏🙏🙏 where are you from please?

I'm not a fan of using double-headed curly arrows and saying that they show that a molecule gave an electron to another atom. Double-headed curly arrows, by convention, show movement of a pair of electrons. For example, we are moving a lone pair of electrons into a bond between two atoms. The explanation used in this video will make it very confusing for when radical mechanisms are considered, where a single-headed arrow is used to show movement of one electron.

*His use of nucleus says nucleus is nucleuses if nucleus suits nucleus-nucleus stress synthesis, I guess.*

Chemistry isn't really my favourite subject at all... but I love organic chem....

Nucleophilic substitution made even simpler ,explained from a layman's approach hence simpler. #thumps up

Awesome.

so helpful! thankyou

i'm spuddering here - not as hungry for it, doesn't grab me

its also totally easy to learn that way!

the tertiary carbocation is most stable but it would sterically hinder sn reactions so sn2 reaction only applies to primary or secondary carbons. they are slower on primary carbons.

@s05bf1c5 yea.I think that the oxygen giving up an electron is because H20 water already has a complete octet, since it's full and if it gains another electron it will violate the octet rule.I'm not sure. Secondly,Br is more electronegative so it's already giving C a partial +,since BR is a good leaving group,Br leaves.Then OH- attacks the C that has a partial +. OH- is the Nucleophile, it likes nucleousses that have positive charges. Since it's a Sn2 reaction,everything happens in one shot :)

Great! 😊

Hhahahaah, very true. He's actually in the middle.

Me in orgo class :( Me watching your vids :) Keep up the good work!

The famous backside attack.

This guy is the s**t. Very helpful in conceptualizing Ochem and very useful for the MCAT. I wish I had this when I was in school.

I think its because the oxygen still has a partial negative charge that attracts the partial positive charge of the hydrogen on the other H-O-H. H and O have different electron affinities which explains the polarity of water. I hope I made sense lol.

why does the "whole" Bromide leaves when recieving the electron from the hydroxide?

our teacher called this the "back side attack". you said they have to "bump into each other the right way." lol,

very clear thanks !

THANKS SO MUCH, BE BLESSED

Tell me why Im learning more from an 11 minute khan academy video from 11 years ago than my entire ochem lecture over SN2 reactions

You saved me, thanks

love it.

Without him I think many college classes would be failed

Seven, seven valence electrons, ah ha ha ha ha!

ahh i see what you did there... 'personal "bond" ' :P

haha alright so hes kinda creeped out probably..kinda loving it..hahah

thnk god i found dis,i just couldn't bear readin boring org chem books...

Actually both are used and both are okay. However I prefer nuclei as well. You don't get to use that type of plural too often, might as well use it when you can get away with it :)

love u sir...thank u...!!!

I don't think so. OH is added here. When you add OH, you don't add it by itself. You have to buy it as NaOH, for example. On paper sometimes you don't see it when it's not necessary.

what would happen, if you had a primary or secondary carbon ?

10 years later and you’re the reason I’m passing

amazing

@imkaneforever "It really makes me feel like I have a personal bond to them" I see what you did there =P

@manvigupta505

4 жыл бұрын

Woah a 7 year old comment.

this would be true if he were talking about free radicals; however, these reactions are understood to be involving both electrons.

nice video... i understood evrything... superlykk

In Bromomethane Bromine and Carbon are more electronegative than Hydrogen , the electrodensity is pushed to Bromine, why doesn't the Oxygen attack one Hydrogen atom in Bromomethane. Wouldn't the Hydrogens be more partially positive charged than Carbon, aka be more electrophilic?

so the bromide just breaks out of the molecule

Sn2 doesn't occur in tertiary carbons due to steric hindrance though, yeah?

the plural of nucleus is nuclei!

@YourAverageHater

9 жыл бұрын

fucking liar

Why doesn't the bromine attract the electron first and become an Sn1 reaction? I mean i know how to differentiate between Sn2 and Sn1 but why is reaction the way it is?

@namrata9277

7 жыл бұрын

MENTION IN ONE OF THE ABOVE COMMENTS IN REPLY SECTION ON TANISSTHAS 2ND COMMENT.. DO WATCH IT :)

how do we identify a Sn1 from a Sn2 reaction?

Actually, no. Both forms of the plural are equally acceptable. Great video as always.

the positive ion to balance it is not drawn for simplicity

can anybody link me to a video where he shows protection group chemistry using grignard reagents? i have good enough notes but id love to see how mr. khan teaches it

ok i´ll make it quick..I LOVE U SIR !

instead of H20 u may think of the reaction with OH- (even)

THANK YOU!!!

thank you sir !!!!!! :)

I don't understand. At 2:20, why would oxygen give an electron to the hydrogen if he is more electronegative, he wants electrons, and then the oxygen gets a partial positive charge? I'm confused..

I would probably pass tomorrow's exam had I skipped this garbage prof I have who does not have his life in order, and should have spent that precious time taking notes here. Thanks!

in my dialect it is nucleuses.

good

Thank you a lot

Khan academy to the rescue!!! Taadaaa...!!!!

Aye.

nucleuseses! yess

Lol, I agree.

Hi khan!

love you fam

''I'm not a greek scholar''

Does it bug anyone else that he called the Br(-) Bromine? I always thought it turned into a "Bromide Ion."

Sir Khan: you're an ass saver ... hats up for you

In the SN2 reaction, it is improper to show single-electron species.