- Видео 131
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Chang Barrick
Добавлен 22 мар 2008
本頻道除了放置麻省理工學院開放課程影片之外,台中市三腳貓游泳俱樂部的所有活動影片也放置於此.
Видео
108年大會dvd
Просмотров 914 года назад
Lecture 25 - Models in 3D Space (1869-1877); Optical Isomers
Просмотров 1,3 тыс.12 лет назад
Despite cautions from their conservative elders, young chemists like Paternó and van't Hoff began interpreting molecular graphs in terms of the arrangement of a molecule's atoms in 3-dimensional space. Benzene was one such case, but still more significant was the prediction, based on puzzling isomerism involving "optical activity," that molecules could be "chiral," that is, right- or left-hande...
Lecture 24 - Determining Chemical Structure by Isomer Counting (1869)
Просмотров 52412 лет назад
Half a century before direct experimental observation became possible, most structures of organic molecules were assigned by inspired guessing based on plausibility. But Wilhelm Körner developed a strictly logical system for proving the structure of benzene and its derivatives based on isomer counting and chemical transformation. His proof that the six hydrogen positions in benzene are equivale...
Lecture 23 - Valence Theory and Constitutional Structure (1858)
Просмотров 40812 лет назад
Youthful chemists Couper and Kekulé replaced radical and type theories with a new approach involving atomic valence and molecular structure, and based on the tetravalence and self-linking of carbon. Valence structures offered the first explanation for isomerism, and led to the invention of nomenclature, notation, and molecular models closely related to those in use today.
Lecture 22 - Radical and Type Theories (1832-1850)
Просмотров 56712 лет назад
Work by Wöhler and Liebig on benzaldehyde inspired a general theory of organic chemistry focusing on so-called radicals, collections of atoms which appeared to behave as elements and persist unchanged through organic reactions. Liebig's French rival, Dumas, temporarily advocated radicals, but converted to the competing theory of types which could accommodate substitution reactions. These decade...
Lecture 21 - Berzelius to Liebig and Wöhler (1805-1832)
Просмотров 40212 лет назад
The most prominent chemist in the generation following Lavoisier was Berzelius in Sweden. Together with Gay-Lussac in Paris and Davy in London, he discovered new elements, and improved atomic weights and combustion analysis for organic compounds. Invention of electrolysis led not only to new elements but also to the theory of dualism, with elements being held together by electrostatic attractio...
Lecture 20 - Rise of the Atomic Theory (1790-1805)
Просмотров 89712 лет назад
This lecture traces the development of elemental analysis as a technique for the determination of the composition of organic compounds beginning with Lavoisier's early combustion and fermentation experiments, which showed a new, if naïve, attitude toward handling experimental data. Dalton's atomic theory was consistent with the empirical laws of definite, equivalent, and multiple proportions. T...
chem125 19 101708
Просмотров 20812 лет назад
Lecture 18 - Amide, Carboxylic Acid and Alkyl Lithium
Просмотров 72712 лет назад
This lecture completes the first half of the semester by analyzing three functional groups in terms of the interaction of localized atomic or pairwise orbitals. Many key properties of biological polypeptides derive from the mixing of such localized orbitals that we associate with "resonance" of the amide group. The acidity of carboxylic acids and the aggregation of methyl lithium into solvated ...
Lecture 17 - Reaction Analogies and Carbonyl Reactivity
Просмотров 56912 лет назад
Continuing the examination of molecular orbital theory as a predictor of chemical reactivity, this lecture focuses on the close analogy among seemingly disparate organic chemistry reactions: acid-base, SN2 substitution, and E2 elimination. All these reactions involve breaking existing bonds where LUMOs have antibonding nodes while new bonds are being formed. The three-stage oxidation of ammonia...
Lecture 16 - Recognizing Functional Groups
Просмотров 69912 лет назад
This lecture continues the discussion of the HOMO/LUMO view of chemical reactivity by focusing on ways of recognizing whether a particular HOMO should be unusually high in energy (basic), or a particular LUMO should be unusually low (acidic). The approach is illustrated with BH3, which is both acidic and basic and thus dimerizes by forming unusual "Y" bonds. The low LUMOs that make both HF and ...
What a stunning song and video, awesomely done!
Are you sure it is a top university in the world😅
I came from senior high school in China，But I think the university teacher is so simple😊
Or they cheated
In india it is high school physics and we muging for marks and money
“It’s that simple”……
So are we supposed to just ignore that he has a banana
after 14 years! 🤓
His name is walter lewin..
is this a fundamentals or revision class? because this was taught in grade 11 right?
Came from the temperature-pressure function problem
Funny I’m watching this my physics teacher made me do a presentation about springs because I wasn’t paying attention in class. He was a good teacher but not even close to this professor. Also the quality of the steel used for the spring affects very much it’s characteristics and capabilities of retaining its original shape when freed of tension
whats up with the banana
Part 4 was titled wrong, see here ruclips.net/video/noQgek85eIk/видео.html
Part 4 was titled wrong, see here ruclips.net/video/noQgek85eIk/видео.html
😁🥰🥰🥰🥰I love Pyhsics مو دكتور (بروفسور)ضييم شرحه يجنن
I like this guy. (I think hisreaction time is better than .1sec. because he can see it approaching and time his movement accordingly.)
nice job, profe
second ,moving,
bursar a profesor univercity
chair profesor univercity
tape measurer
blackboard profesor univercity burley
board
blackboard
theory
material
date fee chair univercity ,registration ,marron 2 seal ,date , burley ,bursey,profesor ,
squaer, sErkal,
formula
This is really helpful, but it's hard to follow along because the quality of the video is so low that I can't read the slides. I actually already know about orbital mixing and LCAO, and it's still hard for me to follow. Thank you very much for uploading it, though! I know technology back in the day wasn't what it is today.
students in my country learn this at grade 11._.
Yeah, in mine as well, but remember they are in America. :flushed:
I wish I could be one of your students in MIT!
Had to go make a ham sandwich with potato salad after watching!
Hmm good I came here because walter levin told to watch●
Hmm good I came here because walter levin told to watch●
and that's why chalk boards rule!
Please Sir since the d/l of the mouse and the elephant was about the same instead of the elephant's being 10 times that of the mouse, does it mean the scaling argument was wrong?
واو
his name is "Lewin"
BANANAAAAAAAAAAAAAAAAAAAAA
Want to know the reason behind the banana on his shirt
What accent is this
Slides: chem125-oyc.webspace.yale.edu/
Is there a date and year for this? For citation purposes
I'm just focusing on banana..))p
Option 3. You must be an exceptional teacher
This guy is an absolute legend. Just wish I could find part 4
Part 4 was titled wrong, see here ruclips.net/video/noQgek85eIk/видео.html
They teach this in MIT, i am studying this in 11th grade in India
Some high schools don't have the resources to teach science topics like this...it is quite sad but true. So most colleges in the USA will have courses that cover high school material, so that talented students from lesser backgrounds may have the opportunity to catch up to their more privileged peers.
It’s just a snack. He eats in lunch break.