HIST498 Chapter Notes -Polystyrene, Dichloromethane, Miscibility
6 Mar 2014
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Solutions to term exam 2 will be posted when i"ll have a chance typing them. All molecules and atoms have london dispersion forces. However their importance increases in molecules without a permanent dipole. Disturbance of the electron cloud, caused by applying an electric/magnetic field or by asymmetric movement of molecules or by a polar solvent. But ldf increase in strength with increase in atomic size. More e greater opportunity to disturb e cloud stronger induced dipole. Gas still weak ld gas medium ld. Increase size stronger ld harder to break higher mp and bp. Remember imf (solid) > imf (liquid) > imf (gas) Compounds tend to dissolve in solvents with similar type and magnitude of intermolecular forces. Attraction forces between the same molecules (in the solid) are replaced by similar attractions with solvent molecules. Similar point can be made for the miscibility of two liquids.
