CHEM 108 Lecture Notes - Lecture 10: Van Der Waals Force, Boiling Point, Viscosity
11 Aug 2016
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Document Summary
Nonpolar in the presence of ion = ion-ion interaction in the presence of polar = ion-dipole in the presence of nonpolar= ion-induced dipole in the presence of another polar molecule = dipole-dipole (hydrogen bonding: h-o, h-f, In the presence of a nonpolar molecule = dipole induced in the presence of another nonpolar molecule= london dispersion forces. London dispersion forces= momentary dipole bc of traveling electrons shifting (weakest bc it only lasts for a minute) Induced dipole = separation of charge in an atom or molecule due to a momentary uneven distribution of electrons. Polarizability= relative tendency of electron density of an atom or molecule to be distorted by a charged particle (as size of molecule increases, polarizability increases) Strength of dispersion forces: size of atoms/molecules & shape (increases surface area=increased interactions between molecules) (linear vs branched = empirical formula is more linear or branched- the more branched it is the lower the bp)
