Unit 3-Notes 3 b - Keywords Polarizability Hydrogen bond...

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Keywords Polarizability Hydrogen bond Vapor pressure Binary hydrides Intramolecular hydrogen bond
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Polarizability is the ability of the electron cloud to get distorted
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What are the factors that decide the polarizability of a molecule? How is it reflected in the boiling point?
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In molecules with large numbers of atoms the polarizability will be larger compared to smaller molecules. The polarizability of a molecule increases with both increasing size and increasing numbers of atoms in the molecule. So we expect the magnitude of the instantaneous dipoles, and therefore the strength of the London forces, to be greater the greater the number of atoms in a molecule and the larger the atoms. The polarizability of N 2 is greater than H 2 , and that of CCl 4 greater than CH 4 , and CO 2 greater than that of CO. The strength of the intermolecular attractive forces is reflected in the boiling points of the substances. What are the factors that decide the polarizability of a molecule?
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This note was uploaded on 04/08/2010 for the course CHM CHM140Y5 taught by Professor Dr.krish during the Spring '09 term at University of Toronto- Toronto.

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Unit 3-Notes 3 b - Keywords Polarizability Hydrogen bond...

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