CHEM 125A - Freshman Organic Chemistry I
Lecture 03 - Double Minima, Earnshaw's Theorem, and Plum-Puddings. Continuing the discussion of Lewis structures and chemical forces from the previous lecture, Professor McBride introduces the double-well potential of the ozone molecule and its structural equilibrium. The inability for inverse-square force laws to account for stable arrangements of charged particles is prescribed by Earnshaw's Theorem, which may be visualized by means of lines of force. J.J. Thomson circumvented Earnshaw's prohibition on structure by postulating a "plum-pudding" atom. When Rutherford showed that the nucleus was a point, Thomson had to conclude that Coulomb's law was invalid at small distances. (from oyc.yale.edu)
| Lecture 03 - Double Minima, Earnshaw's Theorem, and Plum-Puddings |
| Time | Lecture Chapters |
| [00:00:00] | 1. Distinguishing Equilibrium and Resonance |
| [00:06:38] | 2. The Structure and Surface Potential of Ozone |
| [00:20:58] | 3. Visualizing Electrostatic Force: Earnshaw's Theorem |
| [00:35:08] | 4. J. J. Thomson's Plum Pudding Model |
| References |
| Lecture 3 - Double Minima, Earnshaw's Theorem, and Plum-Puddings 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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