Lec-19-Chap-09-3 - Lecture 19 Molecular Polarity 9.5...

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1 Lecture 19 Molecular Polarity 9.5 Intermolecular Forces I 9.6 London Forces, Dipole-Dipole Interactions Lecture 19, Knowledge and Skills • Know what a dipole moment is • Know the range of dipole moment sizes for molecules • Know how polar molecules interact with each other or with external electric fields • Determine whether a molecule has a dipole moment or not • Know about induced dipole moments • Estimate the influence of molecular polarity on physical properties Dipole Moment Unit of dipole moment used in chemistry: Debye (D) A dipole of two opposite charges of 10 -10 esu (electrostatic unit) separated by a distance of 100 pm has a magnitude of 1 D. (10 -10 esu ± 0.2 e) Two charges with the size of about one fifth of an electron/proton separated by the distance of somewhat less than a typical bond length generate a dipole moment of about one Debye. Bonds with dipole moments on the order of one Debye or more are strongly polar.
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