The explanation of this video is amazing! Thank you so much, Mr. Thornley, for taking the time to explain it this well! It is heavily appreciated by all of us struggling IB students.
Fantastic !!! The smiley face thing was great. Like there is a disadvantage when using protic solvents because they surround the neucleophile but there is more advantage that they stabilize the carbocation and leaving group in SN1.
Hello Mr. Thornley, I am writing this from my second account and you are probably getting these kinds of messages all the time, but I just wanted to thank you for your help through your videos these past two years. I got a 7 in chem hl in N22 and even though chem was my strongest subject along these years, i believe, your videos were the extra push that got me this grade. I got a 45 overall by the way, and if it weren't for you, I might not have gotten a perfect score. I wanted to write this comment under the Sn1&2 video because there was a super hard question in the exam on this topic, and i am really proud that i got it right :) Anyways, I appreciate for everything you are doing. Keep helping the miserable ib kids all around the world. Much love...
Thank you so much for the informative video! Just a question, I am rather confused since the 2016 IB Chemistry syllabus states that the best type of solvent for Sn2 is aprotic and non-polar... although that makes no sense to me. Any thoughts on this?
This video took me days to research (the books do not align) and try to understand. Ultimately the IB asked one big question about it and (if I recall) never again. If I think too much about it then the reasons could reverse for the solvents ... so I am not going to think about it!
In the Protic polar solvent: why is it desired to stabilise the nucleophile (OH-)? Doesn't this make it more difficult for it to react with the carbocation? Why does it still react with the carbocation?
Ian San I think it helps STEP 1 occur first. When it has, that OH- that is surrounded may be more likey to break out and react with the new carbocation(more positive charge than the starting molecule). That's what I think but I'm also trying to get this checked as it always manages to confuse me when answering these solvent questions...
What breaks the bond between the carbon and fluorine in the first place? I thought the nucleophile was the main reason these bonds break simply because OH- is more reactive than Flourine.
In Sn1 the haloalkane breaks apart without help form the Nu-. It happens spontaneously in IB, but in reality I think that maybe solvent collision or molecular stretching that pops of the halide ion. In Sn2 the Nu- causes the bond to break (since it is hitting the other molecule)
![20.1/R3.4.11 Electrophilic Addition to Alkenes [HL IB Chemistry]](http://i.ytimg.com/vi/5a4ZJPeo2bY/mqdefault.jpg)
The explanation of this video is amazing! Thank you so much, Mr. Thornley, for taking the time to explain it this well! It is heavily appreciated by all of us struggling IB students.
ta lots!
This has to be one of my favourite videos you've done. Thanks!
It took a while to collate the information - the books disagreed - but I go back to the IB model answer for the ultimate IB max. point solution!
Ur teaching method is amazing bcz all teachers tell aboul the solvents but they don't give the uses and work in reaction like u in practical way . 😊
This vid took so long to research - the IB books had differing ideas and approaches.
Fantastic !!! The smiley face thing was great. Like there is a disadvantage when using protic solvents because they surround the neucleophile but there is more advantage that they stabilize the carbocation and leaving group in SN1.
Hello Mr. Thornley, I am writing this from my second account and you are probably getting these kinds of messages all the time, but I just wanted to thank you for your help through your videos these past two years. I got a 7 in chem hl in N22 and even though chem was my strongest subject along these years, i believe, your videos were the extra push that got me this grade. I got a 45 overall by the way, and if it weren't for you, I might not have gotten a perfect score. I wanted to write this comment under the Sn1&2 video because there was a super hard question in the exam on this topic, and i am really proud that i got it right :) Anyways, I appreciate for everything you are doing. Keep helping the miserable ib kids all around the world. Much love...
HL Chem 7 is a real achievement - well done. I have only ever met two 45s in 25 years of IB! Your comment made my day.
@@ibchemvids Thank you so much! You made my 2 whole years, that was the least I could do. Best wishes.
Choosing your fighter scared me, gave me flashbacks of careless days 😂
you are a god
videos still helpful even after IB
Thank you so much for the informative video! Just a question, I am rather confused since the 2016 IB Chemistry syllabus states that the best type of solvent for Sn2 is aprotic and non-polar... although that makes no sense to me. Any thoughts on this?
This video took me days to research (the books do not align) and try to understand. Ultimately the IB asked one big question about it and (if I recall) never again. If I think too much about it then the reasons could reverse for the solvents ... so I am not going to think about it!
Im 1 year from IB, but its still so intresting to ignore. Keep the content up.
If the nucleophile isn't an anion (some compound with a lone pair instead), does the solvation concept still apply in sn1?
Thank you so much!
In the Protic polar solvent: why is it desired to stabilise the nucleophile (OH-)? Doesn't this make it more difficult for it to react with the carbocation? Why does it still react with the carbocation?
Ian San I think it helps STEP 1 occur first. When it has, that OH- that is surrounded may be more likey to break out and react with the new carbocation(more positive charge than the starting molecule). That's what I think but I'm also trying to get this checked as it always manages to confuse me when answering these solvent questions...
This is brilliant
exam tomorrow and my brain is just full of it... oh organic chemistry, what are you doing to me
What breaks the bond between the carbon and fluorine in the first place? I thought the nucleophile was the main reason these bonds break simply because OH- is more reactive than Flourine.
In Sn1 the haloalkane breaks apart without help form the Nu-. It happens spontaneously in IB, but in reality I think that maybe solvent collision or molecular stretching that pops of the halide ion.
In Sn2 the Nu- causes the bond to break (since it is hitting the other molecule)