L15-Interactions_of_Atoms

L15-Interactions_of_Atoms - Part II Interactions of Atoms:...

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Part II Interactions of Atoms: Phase Changes and Phase Diagrams Intermolecular Forces Ion-ion interactions attraction/repulsion between ions Dipole-dipole interactions between polar molecules Hydrogen bonding a special case of dipole-dipole interaction Dispersion forces Dispersion Forces very weak attractive forces important over very short distances present in all types of molecules weak for small molecules short-lived induced temporary dipoles can lead to synchronization of electron movement when close together Dispersion Forces In most cases, dispersion force is the dominant intermolecular force of attraction Strength depends on polarizability of the molecule polarizability depends on the number of electrons number of electrons correlates with mass the greater the mass the stronger the dispersion force 1 2 3 4
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C 5 H 12 Dispersion Forces Strength also depends on shape of molecule more points of contact, stronger interactions H 3 C H 2 C C H 2 H 2 C CH 3 CH 3 CH 3 CH3 H 3 C H 3 C H 2 C C
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L15-Interactions_of_Atoms - Part II Interactions of Atoms:...

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