Open Yale CoursesCHEM 125: Freshman Organic ChemistryLecture 35 - Understanding Molecular Structure and Energythrough Standard Bonds<< previous session| next session >>Overview:Although molecular mechanics is imperfect, it is useful for discussing molecular structure and energy interms of standard covalent bonds. Analysis of the Cambridge Structural Database shows that predicting bonddistances to within 1% required detailed categorization of bond types. Early attempts to predict heats ofcombustion in terms of composition proved adequate for physiology, but not for chemistry. Group- orbond-additivity schemes are useful for understanding heats of formation, especially when corrected for strain.Heat of atomization is the natural target for bond energy schemes, but experimental measurement requiresspectroscopic determination of the heat of atomization of elements in their standard states.Problem sets/Reading assignment:Reading assignments, problem sets, PowerPoint presentations, and other resources for this lecture can be
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