Intermolecular Attractions: Attractions between molecules

Van der Waals Forces• Dipole interactions• Dispersion forces

Hydrogen Bonds

A polar molecule:Water H H

O

A non-polar molecule:CO2

Click on the pictures above to go to a sites that shows a lotof water forming hydrogen bonds

Hydrogen bonds: when hydrogenmakes a weak bond with thenegative pole of other molecules

This picture shows another view of hydrogen bonding between water molecules

Click on the pictures above to see how water,a polar molecule, dissolves an ionic compounddue to it polar nature.

Hydrogen bonds: a type of intermolecular bonding

ammonia in water

Click on the picture above to see an animation of ammonia and water interacting together.

A hyperlink to an advanced page showing a couple of animations including how di-pole attractions occur and london forces.

Another hyperlink to tutorials and animations

Van der Waals Forces1. dipole interactions

These subtle forces give enough attraction between some molecules that theycan form liquids and solids at low temperatures.

2. Dispersion Forces: tiny momentary dipoles in molecules due to electrondisturbances caused by the atoms around them.

Link to see a picture of a diamond. An example of network solidcovalent bonding.

One final type of covalent bonding: Network solid (covalent bonding in 3D)

http://www.ill.fr/dif/3D-crystals/salt.html

diamondgraphitebuckyball

silica SiO2