Dispersion Force: Present in all molecules , Larger & heavier molecules have stronger force, Molecules that are less branched (or more elongated) have stronger force, Significant at really low temperatures or high pressures , Dipole-Dipole Force: Between slightly positive & slightly negative end of molecules , Present in polar molecules , Molecules with larger dipoles have stronger force, Hydrogen Bonding: Strongest intermolecular force (excluding ion-dipole force) , Larger electronegativity change between H & bonded atom (F, O, N) ,

Intermolecular Forces

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