Open Yale CoursesCHEM 125: Freshman Organic ChemistryLecture 2 - Force Laws, Lewis Structures and Resonance<< previous session| next session >>Overview:Professor McBride begins by following Newton's admonition to search for the force law that describeschemical bonding. Neither direct (Hooke's Law) nor inverse (Coulomb, Gravity) dependence on distance willdo - a composite like the Morse potential is needed. G. N. Lewis devised a "cubic-octet" theory based on thenewly discovered electron, and developed it into a shared pair model to explain bonding. After discussingLewis-dot notation and formal charge, Professor McBride shows that in some "single-minimum" cases theLewis formalism is inadequate and salvaging it required introducing the confusing concept of "resonance."Problem sets/Reading assignment:Reading assignments, problem sets, PowerPoint presentations, and other resources for this lecture can beaccessed from Professor McBride's on-campus course website, which was developed for his Fall 2008
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