Chemistry 1301A/B Chapter 2.5: 2.5 - Intermolecular Forces
17 Dec 2015
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Document Summary
3 types: van de waals, dipole-dipole, and hydrogen bonding. Forces result from attraction b/w opp charged particles. Van der waals forces aka london dispersion forces. Weak interactions b/w molecules caused by momentary changes in electron density. Only force that is present in non-polar molecules. Key factor determining strength of this force: surface area. Larger surface area = larger the attractive force b/w 2 molecules = stronger the intermolecular forces. Attractive forces b/w permeant dipoles of 2 polar molecules. Dipoles in adjacent molecules are aligned so tat the partial (+) and partial (-) charges are in close. Hydrogen atom covalently bonded to a highly electronegative atom (f, o, n) and is attracted to a lone pair on another such electronegative atom of a diff molecule. Holds together double stranded dna and rna (a-t, g-c) Boiling point temp at which the vapor pressure of the substance = atmospheric pressure.
