Lecture1 - Intermolecular Forces Intermolecular forces take...

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Intermolecular Forces Intermolecular forces take place BETWEEN molecules. An understanding of intermolecular forces is crucial to a chemist’s ability to successfully carry out reactions in the organic chemistry laboratory. In fact, during the course of a chemical reaction, the majority of manipulations carried out by a chemist involve controlling intermolecular forces. Types of Intermolecular Forces •Induced Dipole Induced Dipole •Dipole Dipole •Dipole Induced Dipole •Ion Ion •Ion Dipole •Ion Induced Dipole
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Induced Dipole Induced Dipole (IDID) (London Dispersion Force) instantaneous δ δ δ δ δ δ i n d u c e p o l dipole He He He He He intermolecular interaction E ID ID = 3 α 2 I 4 r 6 B = polarizability I = ionization potential r = distance between atoms or molecules Boiling point of helium = - 269 °C
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Atom b.p.(°C ) I (KJ/mol) (*10 -24 cm 3 ) He -268.9 2,372 0.20 Ne -246 2,081 0.40 Ar -186 1,521 1.64 Kr -152 1,351 2.48 Xe -107 1,170 4.04 Rn -62 1,037 5.30 E ID ID = 3 α 2 I 4 r 6 Note: There is no mass term in the equation.
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C C C C H H H H H H H H H H H H instantaneous dipole C C C C C H H H H H H H H H H H H δ δ δ δ δ δ δ δ induced dipole C C C C C H H H H H H H H H H H H C C C C C H H H H H H H H H H H H δ
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This note was uploaded on 10/25/2009 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at University of California, Berkeley.

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Lecture1 - Intermolecular Forces Intermolecular forces take...

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