Intermolecular Forces and Boiling Points
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- Опубліковано 4 лис 2015
- Why do different liquids boil at different temperatures? It has to do with how strongly the molecules interact with each other through intermolecular forces. Find out all the different ways, and how to use them to make predictions about matter!
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Guys, listen! In this video, I state that Van der Waals forces and London Dispersion forces are interchangeable, that's actually incorrect! Dispersion forces are momentary dipole-induced dipole interactions, the weakest, whereas Van der Waals interactions are an umbrella term that includes dispersion forces as well as any other interactions involving dipoles, just not interactions involving formal charges. Sorry, my fault!
Yeah! I was a bit confused when you say that.. But , thanks you've recognized your mistake. No one is perfect, though. In general , your videos are the best.
No matter.All is well.I was just confused.Thankyou for recognizing ur mistake.
As(to err is man).
u are my role model
Also can I ask does ion-ion isnt intramolecular interaction? I mean ionic bond and ion-ion isnt the same thing?
when discussing ion-ion interactions, we are referring to the interactions within a lattice of many repeating formula units, so we would call this intermolecular, as there are not really any molecules to speak of.
Thank you chemistry jesus.
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Hi Professor Dave.
As a ninth grader, it's very hard for me to find what happens at a molecular levels- be it for such chemical bonding or even physical phenomena such as refraction. This is because frankly people don't care and make the effort to understand; or because some explanations are too complex and beyond my level. Hence, I'd like to sincerely thank you for uploading these helpful videos. Without all the glam and hype, you explain concepts in such an easy to understand manner. In fact, I'm really surprised that not many people know you. Whenever I search for a concept in UA-cam, I make sure to specify your channel! Thanks once again!
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@Anonymous oh thats the dipole, a sorta interaction(or force) that develops when one of the participating atoms attracts the electrons to itself more than the other atoms
This happens when its electronegativity(how much an atom attracts electrons) exceeds the other atoms by a significant amount, thus causing a sort of net force to develop due to the uneven attraction
Where, and why(more importantly why not) it occurs in certain molecules over others is already covered in the vid, but i hoped i heloed!(and was right in all that i said)
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it does. example : chloral hydrate is one of the only vicinal diols that exist. that is due to chellation only
mmm ppp it's charge to volume ratio isn't as high as fluorine, oxygen or nitrogen so the charge is spread out and effectively diluted
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Maybe start slow and touch up on key terms first like dipoles and covalent bonds, etc. SOOO much fancy science vocab! but you can do it!! :D
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Inter molecular forces........what a wired lesson BEFORE I WATCH THIS VIDEO !!! now it's one of my favorite lesson.THANK YOU VERY MUCH PROFESSOR DAVE !!!
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SO hard for me to understand intermolecular forces. This helped a lot!!
Professor Dave, I have been loving your videos; thank you. I am a physics teacher and have picked up IB High Level Chemistry so I am having to brush up on a lot of concepts. I have a question about van der Vaals forces. Your video classifies only the London Dispersion forces as van der Waals forces, however, according to my textbook and goldbook.iupac.org/V06597.html, van der Waals also includes permanent dipole-dipole and dipole induced dipole interactions. Is this a common discrepancy of classification?
it's true, i have seen van der waals mentioned as including dipole-dipole interactions of all varieties, whether momentary/induced or permanent, this is not what i was initially taught, but to be safest it may be easy to refer to them as dipole-dipole interactions when the dipole is permanent and dispersion forces when temporary, just to be most specific. sorry for the confusion!
Thanks, keep up the great videos
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My textbook say electrical conductivity is ability to conduct electric current due to free electrons with changing composition of the substance.
Is this correct the with changing substance part, I hope it's not spelling mistake and actually without 😰
oh, no i would say it's without, metals conduct electricity because electrons are able to flow freely through the network of covalent bonds, so the substance doesn't change its composition, unless one counts the flow of electrons as changing composition. i would think that its without!
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