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London Forces

Posted: Mon May 28, 2018 3:26 pm
by Kate Manganaro 1F
Hello,
I am quite confused on what exactly London Forces are. Do we need to be able to identify them specifically? If so, how would we do that?
Thank you!

Re: London Forces

Posted: Mon May 28, 2018 4:42 pm
by Briana Lopez 4K
London forces are AKA Dispersion forces, Induced Dipole-Induced Dipole, and Van der Waals forces.
They occur when there is an uneven distribution of electrons causing a temporary dipole moment and temporary partial charge. This temporary dipole creates another dipole called a temporary induced dipole. They are weak, fleeting forces, and are able to occur with all molecules.

Re: London Forces

Posted: Mon May 28, 2018 5:07 pm
by Ismail 1F
A natural explanation is the way geckos can climb on upright surfaces. There are fluctuations in charge distributions between neighboring molecules, which don't have to be polar, and their charge fluctuations naturally fall into synch, creating an attractive force.

Re: London Forces

Posted: Mon May 28, 2018 9:50 pm
by Ziana Bhanji 1E
The London dispersion force is the weakest intermolecular force that there is. It is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.

Re: London Forces

Posted: Mon Oct 29, 2018 1:30 am
by Carlos De La Torre 2L
They are the weakest of any type of attractive force as they are the weakest intermolecular and intramolecular are stronger than intermolecular, but basically, since electrons can randomly gravitate towards one side it creates a temporary dipole where a weak negative side is created with the electrons and a weak positive where there is a lack of electrons.

Re: London Forces

Posted: Wed Oct 31, 2018 11:39 am
by Rachel Dang 1H
London forces are instantaneous or temporary dipoles and it also induces surrounding atoms into having temporary dipoles as well. These are the smallest and individually very weak but actually are the most significant contributor to IMF for most molecules

Re: London Forces

Posted: Fri Nov 02, 2018 1:49 am
by Sam Kelly 1K
Are Van der Waal Forces a specific type of dispersion force or can they be used interchangeably?

Re: London Forces

Posted: Fri Nov 02, 2018 3:37 am
by hannahdaijo_4H
I know that relative to dipole-dipole and hydrogen bond IMFs, London dispersion forces are the weakest. But since LDFs depend on charge, is there ever an instance where an LDF is stronger than a dipole-dipole force?