CHEM 112 Lecture Notes - Lecture 12: Intermolecular Force, Boiling Point, Enthalpy
19 Feb 2017
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Document Summary
Strength of imf (intermolecular forces) between molecules depends on physical state. Compressibility high low none if imf is weak molecules are far apart if imf is strong molecules close together. Compressibility is high it can be condensed. Directly relates to physical properties of compound. Biologically important - in dna and proteins. When substance converted from one physical state to another. When moving from more ordered to less ordered molecules energy is absorbed liquid to gas you add heat and delta h will be positive. More ordered is a liquid, less ordered is a gas. When moving from less ordered to more ordered energy is released causing a negative delta h. Heat of vaporization can be denoted by delta h with a subscript of vap it is the energy required to change 1 mol or 1 gram of a liquid to a vapor at a certain temperature.
