Why are Intermolecular Forces Important? Intermolecular forces play a role in determining the physical properties of a substance (e.g.- melting point &

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Presentation transcript:

Why are Intermolecular Forces Important? Intermolecular forces play a role in determining the physical properties of a substance (e.g.- melting point & solubility).

Types of Intermolecular Forces (Strongest to Weakest) I. H-bonds Found in polar substances where H is bonded to O, N, or F.

Importance of H-Bonds DNA replication & protein synthesis.

Transpiration-Cohesion Theory

Respirators

Density of Ice < Density of Water

II. Dipole-Dipole forces Found in polar substances where H is NOT bonded to O, N, or F.

III. London forces F ound in ALL molecular substances. London forces become stronger as molecular size increases. Therefore, candle wax (C 25 H 52 ) is a solid even though it is nonpolar & only has London forces.

The Effect of Intermolecular Forces on the Boiling Point of Molecular Compounds