UV/Vis spectroscopy | Spectroscopy | Organic chemistry | Khan Academy

Introduction to UV/Vis spectroscopy. How this technique is used to analyze molecules with electrons in pi orbitals and nonbonding orbitals. Created by Jay.
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Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions chemists use to synthesize crazy carbon based structures, as well as the analytical methods to characterize them. We will also think about how those reactions are occurring on a molecular level with reaction mechanisms. Simply put, organic chemistry is like building with molecular Legos. Let's make some beautiful organic molecules!
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[@angelajay3392]

Thank you very much for this video!

[@danspitalnik]

Very helpful. Thanks.

[@Nick23003]

THANK YOU MAN

[@yujessica4732]

The video content is so excellent, congratulations

[@suchonaghosh9324]

Wow..... This is a rich content....

[@Gerolinger]

dude, I really do not understand how this video is so perfect. It is pure information reduced to it´s most simple form. Bravo!

[@asmasworld1519]

iam confused why he keep saying there is 2 pi bonds in double bonds , double bonds have one pi bonds right

[@Gerolinger]

@@asmasworld1519 I’m not quite sure where he said that. I only heard him say that there are two pi electrons per pi bond, which is correct. Also there are two pi bonds in the first molecule. But you are right in that a double bond only contains one pi bond

[@mahaaalghamdi711]

AMAZING

[@mayankshekhar1426]

thanks please upload more terms

[@fabioverdi6291]

Help with a question ????? A compound absorb light in 227 nm. The standard curve calibration for the compound is Abs = 372x + 0,6432 which the concentration is g/100mL. The technique was analytical standard adding from fluoxetine hydrochloride (C17H18F3NO.HCl - molar mass = 345,79 g/mol). So determine the concentration in mol/L from the analysed solution. Show all calcs progression.

[@user-zv6dw2nh8q]

بارك الله فيك

[@MusicandLyrics926]

Can homo/lumo energy gap be calculated form reflectance spectrum?

[@ugurbozuyuk83]

thx

[@whitneycooper6577]

「明確なメッセージ、明確な構造、理解しやすい、ありがとう」、

[@rassimsimou1594]

Good

[@victorhecquet2738]

and what about the infrared ?

[@shrustipatelindia.1000]

In second example , where would other two non bonding electrons of oxygen would go ?

[@anmolkotiyal6272]

Same I guess they would also go there only bit 1 more orbital needed to b made.... He just didi that to show us a example I guess

[@ashlimartin1611]

For the second molecule, why is it that you start from the right side to determine whether or not it is bonding? (Purple vs Blue). I don't understand. Thanks!

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@Lucas Maximiliano instablaster ;)

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@Forrest Otis I really appreciate your reply. I found the site through google and I'm in the hacking process now. I see it takes quite some time so I will reply here later when my account password hopefully is recovered.

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@Forrest Otis It worked and I actually got access to my account again. I am so happy:D Thanks so much you really help me out!

[@forrestotis558]

@Lucas Maximiliano glad I could help :)

[@nshnlle]

i dont really understand 😓😓😓 but thank you anyway :)

[@zunyzap]

if u study MO theory you can, its not that hard

[@suhail1200]

Depends what board u are doing.Im in the UK and we just need to know how electrons get excited and just hitting the equation down and that's it.

[@ngocdiemle6752]

tks you :)

[@piojsanthosh7009]

❤️

[@BulbulChan5]

everything was perfect until 1:21.

[@keysangyonthan]

true :'(

[@reecewithoutherspoon1324]

you probably dont do chem then

[@sorooshsaghebi9465]

it was also perfect after that, if u are having problem with the chemistry part take a look at molecular orbital theory, it'd help u understand these

[@keysangyonthan]

1:29 how can they all be sp2 hybridised, middle 2 atoms I guess they are sp2 hybridised but what about the other, outer 2?

[@anassheashaey]

They are bonded to 2 hydrogen atoms each, which makes each one single bonded to hydrogen twice and double bonded to carbon once just like the internal carbon atoms; The internal carbon atoms also form one double bond with the external carbon and two single bonds (one with the other internal carbon and the other with a hydrogen atom that has been omitted because the molecule is represented in line-drawing). I really hope this clears things out..

[@yup4264]

where are the bonding and anti bonding orbitals?!

[@Nick23003]

Think of it like this: When 2 hydrogen molecules react and form a bond, both their 1s orbitals overlap (exactly like a venn diagram) and the areas which are NOT overlapped are the anti bonding areas of higher energy. (This is what I think is the case)

[@anjalisharma314]

I need to see the absorbance of dichloromethane by carbon by using uv visible spectrophotometer. I had already run a pure dichloromethane to full range of uv visible spectrum I e,190 nm-1100nm to see at which wavelength its peak is seen . And,its highest and clear peak have been seen in 208nm. But in literature the range of DCM for uv visible spectrum is 233nm, and highest 274 nm. Somewhere it is written the range is between 200-300nm. And according to 'OECD guidelines for testing of samples' by uv visible spectrum, it's range is 235 nm for dichloromethane. Now I am confused what wavelength range I must fix for my samples. Please guide me.

[@brandonpetrovich2023]

If this didnt make sense to you, try this video instead: kzbin.info/www/bejne/hJnQhHp5pruFbc0 (I feel like it connected UV/Vis Spec and the underlying principles a lot better 🙂)

[@vadstin4183]

first time dont understand your video , complicated explanation

[@Samuel-bo4xi]

No HOMO

[@tupcilian7645]

wtf

[@ViNguyen-cc4lt]

the sound is not good I am quite disappointed

[@jacobvandijk6525]

Very bad = soft sound!!!

[@abdullahsheikh7588]

Why there is no Arabic translation?

[@quizoxmarx6945]

Same reason why there isn't any other language translation. You don't have to be so single minded about learning.

[@nxph2108]

not good.its not even Sal speaking.didn't understand completely.

[@abdullahsheikh7588]

Why there is no Arabic translation

[@quizoxmarx6945]

Same reason why there is not any other language translation.

[@abdullahsheikh7588]

Why there is no Arabic translation?

[@krishamskorner7009]

There is?

[@phamdung6430]

the sound is not good I am quite disappointed

[@PSTWFBo]

Spectroscopy/metry/Photometry! Vis/UV-Vis/IR Spectrophotometer, FTIR, Atomic Fluorescence S., Mass S kzbin.info/www/bejne/m2TUnqR-pqqhqZI

[@vanle-od4jr]

the sound is not good I am quite disappointed