CHEM 1000 Chapter Notes - Chapter 11: Van Der Waals Force, London Dispersion Force, Intermolecular Force
3 Apr 2019
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Document Summary
Solids, liquids, and gases: a molecular comparison. Major difference between liquids and solids is freedom of movement of constituent molecules/ atoms. Molecules in liquids and solids are closely spaced not easily compressed. Molecules in gases are widely spaced highly compressible. We can transform one state of matter to another by changing temperature, pressure, or both. Ex) water stays as h2o in gas phase (there is no chemical change when state changes) Intermolecular forces originate from interactions between charges, partial charges, and temporary charges on molecules (or atoms and ions) Even the strongest ones are generally weaker than bonding forces (intramolecular) Not to be confused with intramolecular forces (covalent bonding, etc. ) Present in: dilute mixtures of ionic compounds and nonpolar molecules. As ion approaches a nonpolar atom/ molecule, it distorts electron cloud, setting up s small induced dipole in atom/ molecule.
