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Intermolecular Forces
Dipole-Dipole
Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule.
dipole-dipole forces result from the attraction of the positive region of one molecule to the negative region of a second molecule. Dipole-dipole forces also exist between permanent dipoles
Dispersion Force
Hydrogen bonds
The dispersion force-
the weakest of the van der Waals forces and is the force that causes nonpolar atoms or molecules to condense into liquids or solids as temperature is lowered.
This force exists between all molecules, no matter what atoms are in them. they exist between temporary dipoles.
hydrogen bond -
A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative.
Hydrogen atoms have a strong attraction to Fluorine, Oxygen, and Nitrogen atoms. formed to together will form strong hydrogen bonds.
The reason hydrogen bonds are stronger is because they involve large differences in electronegativity, hydrogen being not very electronegative is bonded with extremly electronegative O, F or N creating a large electric dipole.
Intermolecular Forces-
An attraction between 2 or more molecules.
Strength of the forces
Hydrogen bonds-
Stronger
Dipole-Dipole-
Strong
Dispersion-
Weakest