CHEM 125A - Freshman Organic Chemistry I
Lecture 35 - Understanding Molecular Structure and Energy Through Standard Bonds. Although molecular mechanics is imperfect, it is useful for discussing molecular structure and energy in terms of standard covalent bonds. Analysis of the Cambridge Structural Database shows that predicting bond distances to within 1% required detailed categorization of bond types. Early attempts to predict heats of combustion in terms of composition proved adequate for physiology, but not for chemistry. Group- or bond-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 requires spectroscopic determination of the heat of atomization of elements in their standard states. (from oyc.yale.edu)
| Lecture 35 - Understanding Molecular Structure and Energy Through Standard Bonds |
| Time | Lecture Chapters |
| [00:00:00] | 1. The Limits of Molecular Mechanics Programs |
| [00:07:32] | 2. The Cambridge Structural Database and the Demands of Predicting Bond Characteristics |
| [00:21:36] | 3. Calculating Chemically Useful Heats of Formation |
| [00:42:18] | 4. Measuring Heats of Atomization with Bond Energies |
| References |
| Lecture 35 - Understanding Molecular Structure and Energy Through Standard Bonds Instructor: Professor J. Michael McBride. Resources: Professor McBride's website resource for CHEM 125 (Fall 2008). Transcript [html]. Audio [mp3]. Download Video [mov]. |
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