Intermolecular forces

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halle young 4A
Posts: 68
Joined: Thu Jul 11, 2019 12:16 am

Intermolecular forces

Postby halle young 4A » Wed Nov 13, 2019 11:11 am

can someone give a definition for london forces? the definition in my notes is a bit confusing. Also, is van der waals just a term to describe all intermolecular forces?

Brian Tangsombatvisit 1C
Posts: 119
Joined: Sat Aug 17, 2019 12:15 am

Re: Intermolecular forces

Postby Brian Tangsombatvisit 1C » Wed Nov 13, 2019 11:16 am

Van der waals is just another way of saying London forces, which are also known as induced dipole - induced dipole forces. All molecules have these forces, whether they are polar or not. When two molecules get close to each other, their electron distributions fluctuate, resulting in induced dipoles and a weak attraction between them, even if they are both nonpolar.

The larger the atom is, the more polarizable it is, meaning that it has more electrons to be easily distorted when it gets closer to another atom, resulting in stronger LDFs (london dispersion forces).


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