London Forces

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Drew Myers 4G
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

London Forces

Postby Drew Myers 4G » Sun Nov 17, 2019 4:29 pm

Am I right in saying that all molecules have london dispersion forces? If so, why is this the case?

Vincent Leong 2B
Posts: 207
Joined: Fri Aug 09, 2019 12:15 am

Re: London Forces

Postby Vincent Leong 2B » Sun Nov 17, 2019 4:30 pm

yes, all molecules have london-dispersion forces; except in the cases where strong forces such as H-bonds exist, the h-bonds make the LDFs negligible in strength

John Liang 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:18 am

Re: London Forces

Postby John Liang 2I » Sun Nov 17, 2019 4:32 pm

All molecules that don't have dipole moments do have London dispersion forces. You can treat this force as the "default" force between molecules if there are no dipole-dipole or ionic intermolecular forces. This is because naturally, molecules create temporary dipoles with each other for a period of time, then they go away. hope this helps!

Sydney Jacobs 1C
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Joined: Thu Jul 25, 2019 12:15 am
Been upvoted: 1 time

Re: London Forces

Postby Sydney Jacobs 1C » Sun Nov 17, 2019 4:33 pm

Yes, all molecules have London Dispersion interactions. This is because at any instant, the electron clouds of atoms and molecules are not uniform. One region can have a fleeting partial charge while another has a fleeting negative charge. These interactions can therefore occur between all molecules, even nonpolar molecules and in monatomic gases.

Harry Zhang 1B
Posts: 101
Joined: Sat Sep 14, 2019 12:16 am

Re: London Forces

Postby Harry Zhang 1B » Sun Nov 17, 2019 4:53 pm

All molecules have london dispersion forces because it is experimentally observed that the electron clouds in molecules are not fixed and tend to move around, which results in temporary dipole moments that create the london dispersion forces in neighboring molecules.

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