Lecture 4 - Taste Receptors Lecture 4 SHAPE MATTERS...

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SHAPE MATTERS: Molecular Shape Key Idea: Properties of molecules depend on shape and polarity. Taste Receptors sweet receptor B A - H aspartame salt NaCl NaNO 3 NaBr sour HCl HCOOH CH 3 COOH bitter MgSO 4 Na 2 CO 3 Na 3 PO 4 In today’s lecture, you will examine how shape and polarity affect molecular recognition. What patterns did you notice? Valence-shell Electron-pair Repulsion VSEPR Electron pairs move as far apart from one another as possible Where are the electron pairs? CH 4 methane ammonia NH 3 water H 2 O H H O H H N H Tetrahedral Shape: CH 4 Two H atoms bend back Two H atoms bend forward The H atoms are on the vertices. The C atom is in the center. All four vertices are equivalent. Questions Same or different? F F F F CH 2 F 2 CHFClBr CH 4 NH 3 H 2 O VSEPR Repulsion between lone pairs of electrons is greater than that between bonding-pairs -- lone pairs of electrons are more bulky. lone pairs take up space
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This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at Berkeley.

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Lecture 4 - Taste Receptors Lecture 4 SHAPE MATTERS...

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