INTERMOLECULAR FORCES

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INTERMOLECULAR FORCES. Three types of force can operate between covalent (not ionic) molecules:  Dispersion Forces also known as London Forces as Weak.

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Presentation transcript:

INTERMOLECULAR FORCES

Intermolecular Forces Forces of attraction and repulsion between molecules. They are weak – if we say that a covalent bond has a strength of 100 then intermolecular forces would range from 0.001 to 15.

Dipole-Dipole A relatively strong force of attraction between two polar molecules. Can also have ion-dipole forces between ions and a polar molecule

Hydrogen Bonding Is an exceptionally strong dipole-dipole force One of the three most electronegative elements, F, O or N must be covalently bonded to a hydrogen (such as HF, H2O, NH3 , CH3OH and CH3NH2).

London Forces The only attractive force nonpolar molecules. Basically the electrons in one atom are slightly attracted to the nuclei (positive core) of another atom. The greater the number of electrons the stronger the L.F.