Complete revision for OCR A A Level Chemistry. To buy PowerPoint used in this video please visit my tes shop - www.tes.com/teaching-resource...
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Пікірлер: 36
@RoxyMusic18Ай бұрын
I still watch it when I am eating my dinner. So interesting! Thank you for such a great video
@AlleryChemistry
Ай бұрын
Glad you enjoyed it! 😀
@kaybanabraham38384 жыл бұрын
Huge thanks, great video! Just wondering how you distinguish between electron donating and withdrawing groups, since any polar compound will have an electronegative and an electropositive side.
@SP-nd7mf3 жыл бұрын
hi when you are pointing with the mouse at things it cant be seen in the video and makes it a bit confusing to understand what you are talking about. like at 24:00
@gemma47874 жыл бұрын
These vids are gonna be useful for autumn exam cramming after results day 😂
@AlleryChemistry
4 жыл бұрын
Hope so!
@norazenow53203 жыл бұрын
Thank you for this, found it extremely useful!
@AlleryChemistry
3 жыл бұрын
You're welcome!
@Joe-no4xt2 жыл бұрын
excellent video, thank you!
@AlleryChemistry
2 жыл бұрын
Glad it was helpful!
@annabelcasey-sweeney25922 жыл бұрын
If you have a carboxylic acid group attached to a Phenol does Na also attach to the COOH group, replacing the OH?
@francismannion7075 Жыл бұрын
Thank you for a very informative lesson.
@AlleryChemistry
Жыл бұрын
You are welcome!
@mappc8320 Жыл бұрын
Thank you so much!!!
@AlleryChemistry
Жыл бұрын
You're welcome!
@exoticeditz8863 Жыл бұрын
At 15:04 it says that benzene has a high electron density. I'm so confused because I thought the delocalised pi system causes low density. Wouldn't the electrons be more dispersed throughout the ring?
@AlleryChemistry
Жыл бұрын
Yes, we say high electron density as you essentially have 3 double bonds in benzene however they alternate around the structure essentially delocalising the electrons. Where you have double bonds then we always say it has a higher electron density than a single bond. It is all relative.
@atheneparton55573 жыл бұрын
Why is phenol insoluble in water when it has a hydroxy group which forms hydrogen bonds with water ?
@Nataliakennerley
3 жыл бұрын
Phenol is soluble in water to some extent. It is due to its ability to form hydrogen bonding with water molecules. However the large part of phenol molecule is phenyl group that is non polar and hence its solubility if limited in water. However the polarity of this part too increases in phenoxide ion.
@georgemessenger29692 жыл бұрын
When phenol reacts with nitric acid, why does substitution only occur and carbons 2 and 4, rather than 6 as well?
@lattifah3918
2 жыл бұрын
You count how close it is to the OH group on the phenol so the carbon 6 would basically be carbon 2.
@jushpatel3280 Жыл бұрын
Do we need to know the exact lengths for benzene single bonds and double bonds
@TheRealDanielTV
Жыл бұрын
no just that theyre different
@atchek63044 жыл бұрын
Why isn’t a 6 nitrophenol not produced
@kira._.4267
3 жыл бұрын
2 and 6 nitrophenol are the same thing just flipped so you use the smaller number (i think)
@edward2291
3 жыл бұрын
The nitro group on phenol is electron-withdrawing. This has a directing effect to the carbon 3 and 5 (known as meta). The substituent group will only go onto C6 with an electron-adding group (a group usually with a lone pair).
@khoanguyen-le4368
3 жыл бұрын
yeah, 2& 6 are the same product due to symmetry
@nerphymerphy28122 жыл бұрын
19:22
@malanhemal65742 жыл бұрын
why can't a 6-nitro nitro phenol be produced? at 35:21 Thank you sir!
@ameliamattison8854
2 жыл бұрын
it is but its the same as 2-nitrophenol (they might ask you why there is 2x the amount of one isomer and this is because 2-nitro and 6-nitro are the same)
@saimarahman11432 жыл бұрын
Hi Can someone give me the time for each topic when it starts please. Thanks
Пікірлер: 36
I still watch it when I am eating my dinner. So interesting! Thank you for such a great video
@AlleryChemistry
Ай бұрын
Glad you enjoyed it! 😀
Huge thanks, great video! Just wondering how you distinguish between electron donating and withdrawing groups, since any polar compound will have an electronegative and an electropositive side.
hi when you are pointing with the mouse at things it cant be seen in the video and makes it a bit confusing to understand what you are talking about. like at 24:00
These vids are gonna be useful for autumn exam cramming after results day 😂
@AlleryChemistry
4 жыл бұрын
Hope so!
Thank you for this, found it extremely useful!
@AlleryChemistry
3 жыл бұрын
You're welcome!
excellent video, thank you!
@AlleryChemistry
2 жыл бұрын
Glad it was helpful!
If you have a carboxylic acid group attached to a Phenol does Na also attach to the COOH group, replacing the OH?
Thank you for a very informative lesson.
@AlleryChemistry
Жыл бұрын
You are welcome!
Thank you so much!!!
@AlleryChemistry
Жыл бұрын
You're welcome!
At 15:04 it says that benzene has a high electron density. I'm so confused because I thought the delocalised pi system causes low density. Wouldn't the electrons be more dispersed throughout the ring?
@AlleryChemistry
Жыл бұрын
Yes, we say high electron density as you essentially have 3 double bonds in benzene however they alternate around the structure essentially delocalising the electrons. Where you have double bonds then we always say it has a higher electron density than a single bond. It is all relative.
Why is phenol insoluble in water when it has a hydroxy group which forms hydrogen bonds with water ?
@Nataliakennerley
3 жыл бұрын
Phenol is soluble in water to some extent. It is due to its ability to form hydrogen bonding with water molecules. However the large part of phenol molecule is phenyl group that is non polar and hence its solubility if limited in water. However the polarity of this part too increases in phenoxide ion.
When phenol reacts with nitric acid, why does substitution only occur and carbons 2 and 4, rather than 6 as well?
@lattifah3918
2 жыл бұрын
You count how close it is to the OH group on the phenol so the carbon 6 would basically be carbon 2.
Do we need to know the exact lengths for benzene single bonds and double bonds
@TheRealDanielTV
Жыл бұрын
no just that theyre different
Why isn’t a 6 nitrophenol not produced
@kira._.4267
3 жыл бұрын
2 and 6 nitrophenol are the same thing just flipped so you use the smaller number (i think)
@edward2291
3 жыл бұрын
The nitro group on phenol is electron-withdrawing. This has a directing effect to the carbon 3 and 5 (known as meta). The substituent group will only go onto C6 with an electron-adding group (a group usually with a lone pair).
@khoanguyen-le4368
3 жыл бұрын
yeah, 2& 6 are the same product due to symmetry
19:22
why can't a 6-nitro nitro phenol be produced? at 35:21 Thank you sir!
@ameliamattison8854
2 жыл бұрын
it is but its the same as 2-nitrophenol (they might ask you why there is 2x the amount of one isomer and this is because 2-nitro and 6-nitro are the same)
Hi Can someone give me the time for each topic when it starts please. Thanks
the friedal crafts mechanism isnt on the spec
hello bozo