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Intermolecular forces

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Harvey Buckle

on 27 July 2016

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Transcript of Intermolecular forces

Intermolecular forces
To know the three types of intermolecular forces
To know their relative strentgths
Van der Waals/London/ Dispersion forces
Attractions are electrical in nature. In a symmetrical molecule like hydrogen, however, there doesn't seem to be any electrical distortion to produce positive or negative parts. But that's only true on average.
But the electrons are mobile, and at any one instant they might find themselves towards one end of the molecule, making that end -. The other end will be temporarily short of electrons and so becomes +.
Dipole/dipole interactions
A molecule like HCl has a permanent dipole because chlorine is more electronegative than hydrogen. These permanent, in-built dipoles will cause the molecules to attract each other rather more than they otherwise would if they had to rely only on dispersion forces.
Intermolecular forces
There are ___ types of i_________ force:
1. _________ forces
2. ________/ _________ intereactions
3. _________ bonding
Find out the physical states of all of the members of group 17
Write this down
We will use it later
And so..

helium -269°C
neon -246°C
argon -186°C
krypton -152°C
xenon -108°C
radon -62°C

Also, the longer and less branched the molecule, the stronger the London forces
Hydrogen bonding
If ________ is bonded to _____, ____ or ________ (very e_______ elements), the ______electrons sit on the other e______, leaving Hydrogen as an exposed ________. This is highly a________ to the O/N/S of another molecule. This makes a STRONG ____ bond.

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