CHEM 1000 Chapter Notes - Chapter 12: Close-Packing Of Equal Spheres, Bond Length, Ionic Compound
8 Sep 2016
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Chapter 12 - intermolecular forces: liquids + solids. Intermolecular forces occur when there are weak electrostatic attractions between molecules. Electrostatic attractions occur when an electrically positive region is attracted to a e. negative region. Instantaneous dipole is when electrons are concentrated in one region at a given time (by chance). This causes charge separation, of and + are each side, creating a polar molecule (in a molecule that is usually nonpolar). This is based on electron charge density, or probability of an e- being at a region at a particular time. Induced dipole the instantaneous molecule induces a charge separation in the molecule/atom beside it. This is why solids + liquids have strong intermolecular forces, because of dipoles. Polarizability the tendency for charge distribution to distort from its normal shape in an atom/molecule. Because of e- being farther from the nucleus in larger molecules it is not firmly held in place, and therefore can be easily displaced.
