Lecture 1 - Intermolecular Forces Intermolecular forces...

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Unformatted text preview: Intermolecular Forces Intermolecular forces take place between molecules. An understanding of intermolecular forces is crucial to a chemists ability to successfully carry out reactions in the organic chemistry laboratory. The Forces Between Neutral Atoms or Molecules Induced Dipole Induced Dipole Dipole Dipole Dipole Induced Dipole Induced Dipole Induced Dipole (IDID) Interactions (London Dispersion Force) = polarizability E ID-ID = 3 2 I 4r 6 I = ionization potential r = distance between atoms or molecules Induced Dipole Induced Dipole Interactions Between Helium Atoms He He - - - - + + + + Instantaneous Dipole He He He Interatomic Interaction another He atom + + + + + + + + - - - - - - - - Induced Dipole E ID-ID = 3 2 I 4r 6 Boiling Point Differences of the Noble Gases Atom bp( C) He-269 Ne-246 Ar-186 Kr-152 Xe-107 Rn-62 I (KJ/mol) 2,372 2,081 1,521 1,351 1,170 1,037 (10-24 cm 3 ) 0.20 0.40 1.64 2.48 4.04 5.30 IDID Interactions in Molecules C C C C C H H H H H H H H H H H H pentane C C C C C H H H H H H H H H H H H Instantaneous...
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Lecture 1 - Intermolecular Forces Intermolecular forces...

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