WHAT YOU LEARNED: 0:28 Why water has a high boiling point: high electronegativity difference between oxygen and hydrogen, alias hydrogen bonds. 2:26 Why alcohols have lower boiling points than water: just one hydrogen bond. 3:25 Why alcohols are soluble in water: hydrogen bonds between alcohol's and water's hydrogen. 6:18 Why longer carbon chains are, less soluble is the substance: carbon chains are not miscible (they can't be dissolved). 7:53 Why longer carbon chains are, higher is the boiling point: van der Waals forces between carbon chains.
London Dispersion forces were something which my teacher in high school took two or more lessons to tell us about and I still didn't understand them, and you explained them in about 30 seconds, and it made perfect sense. School children should just watch your videos instead of going to class!
I love these vids; it is great to wake up and get a chem lesson in the morning. It has been 20 yrs since I took organic. fyi - your butenol is missing a hydrogen. Question: do alcohols act as acids/bases or affect the pH in any way?
@@minoc2 sorry but i was 6 years old 12years ago, due to which i was able to answer your question. But now with sufficient knowledge i ought to share it with my fellow students of life
Practically not. Alkoxides are stronger bases than hydroxide, so they'll immediately deprotonate a water molecule. Alkyl oxonium ions similarly are extremely strong acids and usually have only fleeting existence before they either deprotonate again or lose a water molecule forming a carbocation which can either combine with water to reform the alkyl oxonium ion or with another alcohol molecule to form a dialkyl oxonium ion which can deprotonated to an ether.
Alcohols absolutely participate in acid/base reactions. Your typical non-cyclic alcohol: R-OH has a pKa of 15-18, and water has a pKa of 15.7, which implies a base such as NaOH is not very favorable. Instead a fairly strong base (such as Hydride or Na metal) is needed to deprotonate an alcohol. In general though, When assessing the strength of any acid, one needs to assess the stability of the conjugate base. the most important factors with alcohols are usually resonance, and induction.
@minoc2 Most alcohols have a negligible degree of (de)protonation in water, but phenols, OH groups directly bonded to benzene rings, are acidic in water. Acids can protonate alcohols, and bases can deprotonate alcohols, so in this sense they do have an effect on the H^+ concentration in water.
WHAT YOU LEARNED:
0:28 Why water has a high boiling point: high electronegativity difference between oxygen and hydrogen, alias hydrogen bonds.
2:26 Why alcohols have lower boiling points than water: just one hydrogen bond.
3:25 Why alcohols are soluble in water: hydrogen bonds between alcohol's and water's hydrogen.
6:18 Why longer carbon chains are, less soluble is the substance: carbon chains are not miscible (they can't be dissolved).
7:53 Why longer carbon chains are, higher is the boiling point: van der Waals forces between carbon chains.
How did humanity even figure this crap out in the first place?
😂😂😂
The Gods, from the Stars mixed there dna with ours
Trial error and just making a guess and trying to prove it
Good question I wonder the same
YOU MADE ME GET 100% ON MY EXAM!
Khan , you are my new Chemist teacher...
organic chem has been hard for me all this while,but not now.thankyouu.I couldnt say no more.It's really help to figure all this reactions,
You are a ridiculously good instructor.... i finally get it. i was about to loose it. Thank you!
Awesome teacher, thanks for sharing with us.
easy revision before a test
London Dispersion forces were something which my teacher in high school took two or more lessons to tell us about and I still didn't understand them, and you explained them in about 30 seconds, and it made perfect sense. School children should just watch your videos instead of going to class!
i have an organic test tomorrow!!! this helped a lot!!! thank u very much!
Let me write that in a brighter colour since is a new word :)
I'm studying chemistry because of this!!!
OK so cute makes u remember ur childhoof
Ikr*
The Carbon closest to the Hydroxide in the case of Butanol should have 2 Hydrogens bonded to it, not just 1!!
This is great help! Terrific :)
I love these vids; it is great to wake up and get a chem lesson in the morning. It has been 20 yrs since I took organic. fyi - your butenol is missing a hydrogen.
Question: do alcohols act as acids/bases or affect the pH in any way?
No, they are neutral
@@MysticSloth02 omg. 12 yr old comment gets a reply. lol.
@@minoc2 sorry but i was 6 years old 12years ago, due to which i was able to answer your question. But now with sufficient knowledge i ought to share it with my fellow students of life
Great! 🎉
yeah the carbon with the alcohol is missing a hydrogen!!!
Abi that or a double bond.
thank you so so much!
Please can you upload a video on haloalkanes and haloarenes!
please sir, it's a humble request! :-)
In butanol the last carbon which attach to oxygen missing a hydrogen
I want you see you do video on alcohol after consuming ethonal lol
Doctor strange taught me a good lesson 😂😂
No. Mass depends on how molecules are arranged in a particular state.
wow this is exactly what i'm learning in my chemistry class right now,
does it matter if the methyl group is like CH3 or H3C ?
good video
Practically not. Alkoxides are stronger bases than hydroxide, so they'll immediately deprotonate a water molecule. Alkyl oxonium ions similarly are extremely strong acids and usually have only fleeting existence before they either deprotonate again or lose a water molecule forming a carbocation which can either combine with water to reform the alkyl oxonium ion or with another alcohol molecule to form a dialkyl oxonium ion which can deprotonated to an ether.
Alcohols absolutely participate in acid/base reactions. Your typical non-cyclic alcohol: R-OH has a pKa of 15-18, and water has a pKa of 15.7, which implies a base such as NaOH is not very favorable. Instead a fairly strong base (such as Hydride or Na metal) is needed to deprotonate an alcohol. In general though, When assessing the strength of any acid, one needs to assess the stability of the conjugate base. the most important factors with alcohols are usually resonance, and induction.
Very good lecture on Alcohol Properties. Thank you.
@tran61021 It's not that hard :/ You just have to have good study habits. THANKS KHAN ACADEMY!
Didnt fuckin get anything, but it still helped in some way lol
@minoc2
Most alcohols have a negligible degree of (de)protonation in water, but phenols, OH groups directly bonded to benzene rings, are acidic in water.
Acids can protonate alcohols, and bases can deprotonate alcohols, so in this sense they do have an effect on the H^+ concentration in water.
look at the periodic table
The most well known property... it makes you drunk as hell xD
Does mass have nothing to do with boiling point?
samus1225 it does not
butanol is missing an H
The buthanol is missing a H
#42
i know it's been a year, but butanol*
why are you just doing line examples?
This representation is slightly improper. It is unexpected from Khan academy
_ _ _ _ _ _ _ _ _ _ _ _ _
Teh di ko gets
Freaking love you
worst