lecture24 (12-1-2006) Ch 11

lecture24 (12-1-2006) Ch 11 - Chemistry 2A-c F2006...

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1 X 180° 180° X 120° 120° 120° X 109.5° Electron pair geometries Electron pair geometries (EPG) (EPG) 2 3 4 HYBRIDS sp sp 2 sp 3 Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch11 (Ch11 -16)285 16)285
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2 z y x SP z y x SP z y x SP z y x SP p p p s p p p s p p p s p p p s 2 1 2 1 2 1 2 2 1 2 1 2 1 2 1 2 2 1 2 1 2 1 2 1 2 2 1 2 1 2 1 2 1 2 2 1 4 3 2 1 3 3 3 3 + = Ψ + + = Ψ + = Ψ + + + = Ψ sp 2 hybrids sp 3 hybrids
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3 Example: Ethylene C 2 H 4 C C H H H H The CARBON is sp 2 hybridized : The 3 sp 2 hybrid orbitals form a trigonal planar arrangement. 3 sp 2 hybrids s + p x + p y VSEPR : trigonal planar EPG around each C-atom. Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch11 (Ch11 -17)286 17)286 HCH (angle) = 120 0
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4 GROUND STATE C atom E 2p 2 s sp 2 hybridized orbitals of C FORMATION OF sp 2 hybrids E sp 2 2p E 2p 2 s HYBRIDIZE This leaves one p orbital unhybrized Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch11 (Ch11 -18)287 18)287
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5 x y z The unhybridized p orbital is perpendicular to sp 2 plane. sp 2 -hybrid orbital UNHYBRIDIZED p- orbital An sp 2 hydridized C atom Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch11 (Ch11 -19)288 19)288
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6 x y z x y z OVERLAP the sp 2
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This note was uploaded on 04/23/2008 for the course CHEM 2A taught by Professor Guo during the Fall '08 term at UC Davis.

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lecture24 (12-1-2006) Ch 11 - Chemistry 2A-c F2006...

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