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Lecture 35 - Dispersion Forces fluctuations in the electron...

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Tro, Chemistry: A Molecular Approach 1 Dispersion Forces fluctuations in the electron distribution in atoms and molecules result in a temporary dipole region with excess electron density has partial (─) charge region with depleted electron density has partial (+) charge the attractive forces caused by these temporary dipoles are called dispersion forces aka London Forces all molecules and atoms will have them as a temporary dipole is established in one molecule, it induces a dipole in all the surrounding molecules
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Tro, Chemistry: A Molecular Approach 2 Dispersion Force
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Tro, Chemistry: A Molecular Approach 3 Size of the Induced Dipole the magnitude of the induced dipole depends on several factors polarizability of the electrons volume of the electron cloud larger molar mass = more electrons = larger electron cloud = increased polarizability = stronger attractions shape of the molecule more surface-to-surface contact = larger induced dipole = stronger attraction
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Tro, Chemistry: A Molecular Approach 4 Effect of Molecular Size on Size of Dispersion Force Noble Gases are all nonpolar atomic elements.
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