Can you explain London Dispersion Forces to me?

Question

Just checking. I could have listed this under physics as well.

Me doth think some answers doth cut and paste from Wikipedia!

Thanks everyone, I was just curious to see the responses. I learned them as one of the Van der Waal Interactions back in college. I was thinking of ways to work them into a sci-fi fantasy storyline.

Answer 1

They are also know as Van de Walls forces.
Atoms and molecules have a permanent dipole. Or in the case of the noble gasses a temporary dipole, (this may be induced externally by collisions), or internally. Such dipoles cause electrostatic attraction between the atoms. This force only becomes significant for unpolarised molecules, (eg CH4), and the noble gasses

Answer 2

Explain London Dispersion Forces

Answer 3

London Dispersion forces, also known as Van der Waals Forces, are the weakest of all intermolecular forces (IMF). It occurs between molecules that have no net dipole moment, such as unsubstitued hydrocarbons and diatomic gases.

Since the electrons are free to move around an atom as they please, there is a certain probability that the electron density will be higher on one side of an atom for a very small period of time. This induces a partial dipole in the atom, meaning one side is slightly more negatively charged than the other. This causes a repulsion of electrons in nearby atoms, making a partial dipole in that atom. This occurs in all atoms, meaking weak partial positive and partial negative interactions.

The larger a molecule is, the stronger the London Forces between molecules will be. For example, Octane has a higher boiling point than Hexane because Octane is larger and has stronger Londer Dispersion Forces.

Answer 4

The London dispersion force is the weakest intermolecular force. It's a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction. London forces are the attractive forces that cause non-polar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently.

Because of the constant motion of the electrons, an atom or molecule can develop a temporary (instantaneous) dipole when its electrons are distributed unsymmetrically about the nucleus.

I just got this from my Physics demystified...on my desk..have fun

Answer 5

The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction. London forces are the attractive forces that cause nonpolar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently.

Answer 6

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dispersion/ london forces are an attraction that occurs brieflly they are temporary dipoles + and - charges like magnets permanent dipoles are between Ionic compounds. hydrogen bonding only occurs with compounds having flourine, oxygen and nitrogen

Answer 7

Yes I can.
Some people call them coppers and other people call them flat foot. I simply call them the police. They work a lot of crowd control, this being the special London Dispersion Force. Disbanding riots are their specialty.

Answer 8

look here for detailed info...
http://en.wikipedia.org/wiki/London_force
http://www.chem.purdue.edu/gchelp/liquids/disperse.html

hope it helps...