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.
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.
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. :)
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)
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 !
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.
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
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.
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.
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.
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
@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 :)
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.
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.
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!
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 :)
your either a sweet old man thats creeped out by all these comments from girls who want to marry you..or your a young kid who finds it funny..either way..KEEP THE VIDEOS COMING!
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.
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?
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.
alessandro felicetti ^^^^^real talk. Same here man
Give him a break on the nucleuseses. We're sciencers here, not languagers.
Scientists* linguists*
@@redmerdeboer1880 WOAH you must be fun at parties
@@redmerdeboer1880 lol
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.
Khan Academy being lifesavers as usual.
nucleuses > nuclei
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. :)
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)
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.
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
> im not a greek scholar
doubt it
When people ask me what university i graduated from ill just say ''KHAN ACADEMY''
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 appreciate your guys' vids. I like the enthusiasm you speak with.
I really appreciate your work, it's very helpful :)
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.
You are really doing students a service!
Truly helpful and thank you.
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.
this is so good. so useful for tmr's exam. thank you so much!
OMG thank u so much for this! I can finally understand it =D
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
nlindor87 who are you??
finally knew understood what sn2 reaction is :D thanks
holy shit the buildup to that NUCLEUSESES was so hype. I loved it. NOT even gonna timestamp it for anyone.
idk what I would do without you, khan academy
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.
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.
i'm spuddering here - not as hungry for it, doesn't grab me
Nucleuses hurt me, just say nuclei.
it's an insult of chemistry
rohit choudhary So what good have u done to raise the standards of chemistry? better then sal khan?
Then you are a masochist, you don't have to watch this video...
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.
Zombie Salad who cares. It’s not about remembering and pronouncing everything flawlessly, it’s about understanding
thanx man.yours a great help
think your Ochem videos will help me in cracking iit-jee
You are really doing a service for students!
Now, I'll never forget that nucleophile loves nucleuses! lol
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
You are wonderful! Thank you so much.
Great! 😊
"Will attack the Carbon... Or, I shouldnt say attack that sounds very aggressive" Lol.
Keep up your amazing work
Thanks for your unconditional love and support 🌹🌹🙏🙏🙋🙏🙏🙏 where are you from please?
so helpful! thankyou
*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.
Without him I think many college classes would be failed
Hhahahaah, very true. He's actually in the middle.
very clear! thanks!
The famous backside attack.
Me in orgo class :(
Me watching your vids :)
Keep up the good work!
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.
love it.
its also totally easy to learn that way!
@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 :)
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.
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.
amazing
@imkaneforever "It really makes me feel like I have a personal bond to them" I see what you did there =P
Woah a 7 year old comment.
You saved me, thanks
love u sir...thank u...!!!
Seven, seven valence electrons, ah ha ha ha ha!
our teacher called this the "back side attack". you said they have to "bump into each other the right way." lol,
ahh i see what you did there... 'personal "bond" ' :P
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
haha alright so hes kinda creeped out probably..kinda loving it..hahah
this would be true if he were talking about free radicals; however, these reactions are understood to be involving both electrons.
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!
THANKS SO MUCH, BE BLESSED
the plural of nucleus is nuclei!
fucking liar
thnk god i found dis,i just couldn't bear readin boring org chem books...
ok i´ll make it quick..I LOVE U SIR !
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 :)
your either a sweet old man thats creeped out by all these comments from girls who want to marry you..or your a young kid who finds it funny..either way..KEEP THE VIDEOS COMING!
thank you sir !!!!!! :)
nice video... i understood evrything... superlykk
10 years later and you’re the reason I’m passing
so the bromide just breaks out of the molecule
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.
why does the "whole" Bromide leaves when recieving the electron from the hydroxide?
good
Lol, I agree.
Aye.
nucleuseses! yess
Sir Khan: you're an ass saver ... hats up for you
THANK YOU!!!
Actually, no. Both forms of the plural are equally acceptable.
Great video as always.
Khan academy to the rescue!!! Taadaaa...!!!!
love you fam
what would happen, if you had a primary or secondary carbon ?
Man, i promise you, if you start charging money for these videos then THEY WIN!!!!!!!!!
the positive ion to balance it is not drawn for simplicity
Nucleusssss'sss'sssss!!! lol
in my dialect it is nucleuses.
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?
MENTION IN ONE OF THE ABOVE COMMENTS IN REPLY SECTION ON TANISSTHAS 2ND COMMENT.. DO WATCH IT :)
''I'm not a greek scholar''
Nucleuseses x'D
NUCLEI!
Sn2 doesn't occur in tertiary carbons due to steric hindrance though, yeah?
Hi khan!
instead of H20 u may think of the reaction with OH- (even)
Khan, nucleuseses is not a word, the term for multiple nucleus is nuclei. lol. u made quite a joke here ;)
In the SN2 reaction, it is improper to show single-electron species.