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S. Michael Stewart
United States
เข้าร่วมเมื่อ 31 ต.ค. 2016
This an educational channel used for general chemistry concepts.
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Cannizzaro Reaction: Isolation of benzoic acid product
มุมมอง 7642 ปีที่แล้ว
Cannizzaro Reaction: Isolation of benzoic acid product
Cannizzaro Reaction: Test for unreacted aldehyde
มุมมอง 1042 ปีที่แล้ว
Cannizzaro Reaction: Test for unreacted aldehyde
Cannizzaro Reaction: Admittedly bad video of the melting point measurement
มุมมอง 202 ปีที่แล้ว
Cannizzaro Reaction: Admittedly bad video of the melting point measurement
Cannizzaro Reaction: Setting up the reaction
มุมมอง 362 ปีที่แล้ว
Cannizzaro Reaction: Setting up the reaction
Cannizzaro Reaction: Theory on how to separate the products
มุมมอง 1482 ปีที่แล้ว
Cannizzaro Reaction: Theory on how to separate the products
Cannizzaro Reaction: Running the reaction
มุมมอง 832 ปีที่แล้ว
Cannizzaro Reaction: Running the reaction
Cannizzaro Reaction: Separatory funnel and isolation of products
มุมมอง 2002 ปีที่แล้ว
Cannizzaro Reaction: Separatory funnel and isolation of products
Oxidation and Reduction: Thin Layer Chromatography of the benzophenone product
มุมมอง 2552 ปีที่แล้ว
Oxidation and Reduction: Thin Layer Chromatography of the benzophenone product
Oxidation and Reduction: Qualitative testing of the benzophenone product
มุมมอง 232 ปีที่แล้ว
Oxidation and Reduction: Qualitative testing of the benzophenone product
Oxidation and Reduction: Oxidation of diphenylmethanol with hypochlorous acid
มุมมอง 1822 ปีที่แล้ว
Oxidation and Reduction: Oxidation of diphenylmethanol with hypochlorous acid
Oxidation and Reduction: Thin Layer Chromatography of Product
มุมมอง 1102 ปีที่แล้ว
Oxidation and Reduction: Thin Layer Chromatography of Product
Oxidation and Reduction: Qualitative Tests
มุมมอง 92 ปีที่แล้ว
Oxidation and Reduction: Qualitative Tests
Oxidation and Reduction: Isolating the final oxidation product
มุมมอง 112 ปีที่แล้ว
Oxidation and Reduction: Isolating the final oxidation product
Diels-Alder Synthesis: Isolation of product
มุมมอง 1502 ปีที่แล้ว
Diels-Alder Synthesis: Isolation of product
even though you named it correctly the logic isnt that triple bond has more priorty infact it is the opposite in many cases here we start naming form the triple bond because of the lowest locant rule which comes before alphabetical order.
not quite - the most reactive functional group almost always sets the anchor point in the molecule in IUPAC, except for carboxylic acids, which is more a reflection on this historical naming of these compounds. When we developed our own material for this course, we found that you can get into false equivalencies when looking at naming as many textbooks happen to pick examples where the priority is usually closest to the end of the chain making the numbering also lower, so it looks like the higher rule is the numbering and not the reactivity. this becomes apparent for more complicated molecules, but with more complicated molecules it also becomes apparent that while IUPAC is well meaning, the reality is there are a myriad of flavors for naming and they look a lot like IUPAC but aren't. a great example of this is "diphenylmethanol" - this looks a lot like IUPAC but the longest chain is actually the benzene ring so the name is really (1-phenyl-1-hydroxymethyl)-benzene. the theme that shows up with these alternative naming schemes is that simpler is better. as such we use IUPAC until it becomes unnamable, then we just jump to whatever works easiest.
@@StubbornAlchemist oh alright thanks alot
THANK YOU!!! Subscribed!
glad you liked it, thanks!
I get it! Thanks :)
glad to hear it!
Very useful
thanks I appreciate it
The should be C5H12
Thanks for the feedback
2:52 No it is not unlikely, the proportion of spin up vs spin down atoms in a given sample is only something like 50.1%
I'm here after watching your "Olifin metathesis" video....that trick is very helpful for the calculation of possible products. Nice explanation... Thank you so much sir ❤️ Keep it up 👍
I'm glad you like it! And thank you for the kind words!
Super clear video, ur drawings are great. Thank you!!
@bananadobanana6035 thanks for the positive feedback, I really appreciate it
It all the halogene can do anti markovnikove on it or anly hbr ?
Any HX (so X = Br, Cl, I) can do anti-markovnikov if you use peroxides or light to encourage a free radical mechanism. in fact most markovnikov reactions have some anti-markovnikov equivalent, so water addition (HX where X = OH) can be done anti-markovnikov using hydroboration oxidation. thanks for asking
Thanks sir
you are very welcome
Thanks bro
you're welcome bro
Isn't it the "Law of mass action" or Kc equation?! Because I feel like it is!
Law of Mass Action dates back to the 1850s and is the progenitor to a lot of this, but in a lot of ways it's an empirical approach to this concept. Looking at reversible reactions they could see that adding reactants drives the forward reaction, but there was no good explanation for this. So it would be misleading to say that this it the law of mass action - law of mass action gives this outcome but doesn't provide a framework beyond empirical experiments. The more rigorous definition of the reaction quotient, Q, is the better explanation, with the requirement that Q = Kc (or Keq, which is the more modern take on K) at equilibrium
@@StubbornAlchemist I am sorry you lost me there; are you trying to approve or disapprove my question? Because I thought this is the stepping stone towards the Law of Mass Action because we know the rates are equal and the ratio of of the rate constants is turn out to be Kc.
@ 1:02 in MRI, the sample is a human body. But usually, the patient isn't dropped in the scanner, haha.
details details
@@StubbornAlchemist No, I don't give details of this dropping of a patient in a scanner ;-)
Hi may I know how to find the overall reaction order for reversible reaction?
I believe you just add all the orders up for both the forward and reverse terms, though it's not been my experience that the overall order is meaningful for reversible reactions and honestly it's not a calculation I've ever done.
@@StubbornAlchemist so let say if the forward reaction has order 1 and reverse reaction has order 2, the overall order shld be 1 - 2 = -1?
@@stevelow7900 I think that is correct, but to be honest I don't think there is a physical meaning for overall order for reversible reactions. for irreversible the order sort of makes sense as it can directly translate into pressure dependence, which is directly observable. but for reversible reaction the observed order will depend on the ratio of products and reactants. sorry to give you such a non-committal answer but I just haven't seen much on this topic.
@@StubbornAlchemist Oooooooo I was quite shocked too haha bcoz I saw this qn in my uni assignment but it wasn't covered in lecture and I can't find anything on internet that talks about the overall order for reversible reaction. Anyways, thank you soooo much for the detailed explanation!!
@@stevelow7900 glad I could help
Thanks respected sir thanks for reply I am so happy and felling pleasure I was just waiting for your reply And the spider man is my dream
why would the tertiary radical be less stable?
tertiarys are more stable, I just misspoke.
Hello sir can I talk to you May you please give me your reply You are brilliant teacher and I love chemistry And I Love Tom Holland Sir please reply to me I will show you the pic
I don't need the pic, but sounds like you have good taste in Spidermen
Hello sir I am an Indian student of yours and i am big fan of spider man
but which version of spiderman? Tom Holland? The Japanese direct to video?
@@StubbornAlchemist No sir is not Japanese version Is marval movie spider man Tom Holland Don't you know that I am just shearing my feelings which is for him My name is mnu please reply
Hello sir can I talk to you May you please reply to me You are brilliant teacher and I love chemistry subject and I love Tom Holland Please 🙏 reply
I love how the underlying logic behind why all this occurs is basically 'voodoo sorcerey' ha ha. Very thoroughly-explained video though, thanks!
thanks, I appreciate it
🎵And after all, you're my Van Der Walls. 🎵
hey buddy, the staff at Guitar Center warned you
Thanks bro Helps a lot
thanks, I really appreciate it
i was looking for something to understand the shouldering affect, and it seems that the quartet of quartet idea just established that, thanks so much.
Thanks, I really appreciate that
Nice explanation
Thanks, I really appreciate it
Good video for understanding the splitting patterns! Regarding the origin and understanding of the J-coupling, there is a property of nuclear spins in NMR that you don't seem to be aware of and it is the fact that both 1H nuclear spin states are almost equally populated inside a sample. As you said, there are 2 possible orientations of a 1H nuclear spin with respect to the external magnetic field, with different energy levels: ↑ and ↓. The population difference between these two states inside a sample is defined by Boltzmann's law: N↓/N↑ = exp(-E/kT), with E = h γ B the difference between the two energy levels. From this law, one can calculate that the population difference is actually very small, even inside a strong external magnetic field (<0.1% even for 1GHz magnets). As a result, also only a small amount of nuclear spins are excited perpendicular to the external field during an NMR experiment. ** To sum up: during the entirety of an NMR experiment, the number of ↑ and ↓ 1H spins inside a sample is basically the same and randomly distributed, thus explaining your comments 2:50 and 4:05. **If one goes beyond the vector model, the nuclear spins aren't actually excited to a state perpendicular to the external field, it is more a question of coherence, but no need to go that far in the theory to understand J-coupling
Aware of since I took a graduate course in NMR, but for this level I try to keep it simple enough that not too many important details get glossed over. Relying on boltzmann distributions to describe spin populations seems a bit optimistic for a sophomore level organic course. but thanks for your feedback
Hi thank u for the nice explanation i just have a question do the 2 carbon atoms rotate at the same time or just only 1 carbon rotates withrespect to the other
it's better to think about it that way - they can both technically be rotating, but really it's just one turning relative to the other one
So "quartett of quartetts" for the CH2 in Propane, wouldnt that in the spectra then just look like a Septett ?
A quarter of quarters would be four peaks each split into 4 peaks - so 16 total peaks - whereas a septet would be just 7. When it splits that much you'll generally see people write "multiplet" because, while it's truly a quartet of quartets, in practice each peak would only be 4-8% of a single proton signal (so less than 1% of the signal of two methyl groups creating it), so unless your signal-to-noise (S/N) is incredible, it'll just be a bunch of bumps against the baseline.
according to some texts dihedral angle is only valid if the two half planes contains two sets of three atom having two atoms in common.in that case what will be the dihedral angle in 1,1,1 trichloro ethane staggered newman projection.according to the above definition it will not be defined.actually it is a pyq of a indian entrance exam ,and ans provided in internet is 60 degree.i will be very pleased and grateful if you reply
As for the definition you've provided, this is the generally used one in chemistry, though I know you can come across a few others in computation chemistry and mathematics. In the lowest energy configuration I would agree that the angle would be gauche (60 degrees) as it would minimize steric interference between atoms on the adjacent carbons. I have a couple of videos on this; th-cam.com/video/7QACswGsSO8/w-d-xo.html and th-cam.com/video/aFbtBNMKYP4/w-d-xo.html
Great work
so helpful
thanks!
@@Jennilovesyouu14 thanks I really appreciate the feedback
Please find the dihedral angle at BF3 and C2H2
For BF3 there are no dihedral angles because there is only one central atom but the bond angles are 120-degrees. For C2H2 there are also no dihedral angles because the entire molecule is linear.
Madhar chod englandian bsdk
Does it really matter if the double bond was inward or outward the shape
For elimination to occur by an E2 mechanism the leaving group and the associated H on the adjacent carbon have to anti-periplanar - meaning on opposite sides of the carbon-carbon bond (which is being converted to a double bond). So technically yes, but for linear alkanes this can be overcome as the molecule can rotate around single bonds, this is will just have implications on your final stereochemistry. For rings, this means a hydrogen must be trans to the leaving groups for E2. If you have E1, such as acid catalyzed dehydration of alcohols, then it doesn't matter as the hydrogen isn't removed at the same time as the leaving group.
Good video, thank you!
thanks I really appreciate it
Simple, Thoroughly Detailed, Visually Demonstrated, Straight to The Point Lesson; you sir have mastered the art of teaching. Thank you for your service. 👍🏾
I really appreciate it! Thanks!
Your videos seem to be under appreciated! 😔I love that they are short and sweet, and at the same time have all the info needed. Just what is necessary, no other bs. Hope your channel grows!!
Thanks, I really appreciate the comment.
Simple and to the point. Thanks!
Glad it helped!
Nice teaching Thank u sir 🙏
Thank you very much, I appreciate that
It's quite good ... Can you please tell what are the bulky groups which resist flipping
pretty much any group that have more than 3 carbons in it, such as tert-butyl and isopropyl groups, or any long chains that come off the ring.
@@StubbornAlchemist thanks alot
@@vibessz21 you're welcome
Great explanation!
thanks, I really appreciate it
Gajjjjjab explain
what do you need explained?
Gajjab in hindi means it's superb
@@vibessz21 oh well, thank you then I appreciate it
Thank you sir i thought this was planar, iam learning to draw plane of symmetry for compounds to understand if it's optically active ,this helped me
thank you, I'm glad to hear that
Thanks, I'm gad to hear that
can you do one with dienes, for the s-cis and s-trans
Can you make a video n confirmation of cyclohexane
here you go th-cam.com/video/XXS23VYCjFM/w-d-xo.html
So the stereochemistry can be wedged on either the bonds attached to the new carbon or the 2 bonds that were previously connected together by a double bond?
correct - you'll end up with both chiralities, so both wedged or both dashed
Thanks a lot sir for explaining the stereo-chemistry part of this reaction. Love from INDIA.
तुम्हारा बहुत स्वागत है
hey are they strong O.A. or weaker ..? by seeing that u just oxidise once , i thing they might be weak O.A. , but please tell me :) , thanks !
they are a weaker oxidizing agent, which is why they can't convert a primary alcohol into a carboxylic acid and instead only into aldehydes. They are effectively Jones reagent (chromic acid) that has been poisoned with chlorine to make it a weaker AO, much like the Lindlar catalyst is a poisoned Pd catalyst that can't hydrogenate as well.
thanks for sharing!
thanks!
How can you use PV =RT when n is changing due to vaporization?
Clausius-Clapeyron assumes equilibrium has been established, which is reasonable if let the pressures equilibrate in contact with a heat source (e.g., measuring vapor pressure by measuring the pressure of a sealed vessel in a hot water bath). For transient systems, it's a let a more complicated and you'd have to know the dH (heat of vaporization) to even solve those kinds of problems.
@@StubbornAlchemist I don't have sufficient knowledge to understand that, but actually I figured it out. n/V (and, hence P/RT) is constant here and deltaH is changed from enthalpy to enthalpy per mole somewhere in the derivation. Hope I am right.
Superb 👌
Thanks
Thanks
you're welcome. glad this helped