lecture22 (11-27-2006) Ch 10-11

lecture22 (11-27-2006) Ch 10-11 - Chemistry 2A-c F2006...

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1 PREDICTING THE SHAPES OF MOLECULES How? Based on the Lewis dot structure How?? Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -30)247 30)247 Electron pairs BOND PAIRS LONE PAIRS O The principle that electron pairs stay as far apart as possible. H H
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2 Based on the idea that all electron pairs repel each other and stay apart as far as possible We can find the molecular shape V ALENCE S HELL E LECTRON P AIR R EPULSION VSEPR VSEPR The lone pairs occupy more space than bond pairs This means that atoms bound to a central atom are as far apart as possible Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -31)248 31)248
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3 Be 180° 180° Be 90° 270° The shape of BeCl 2 is linear . BeCl 2 TWO ELECTRON PAIRS AROUND BERYLLIUM ATOM Cl Be Cl LINEAR ARRANGEMENT BEST. Be Cl Cl NO OCTET ON Be Cl Cl Cl Cl Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -32)249 32)249
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4 B 120° 120° 120° FF F B THE SHAPE OF BF 3 IS TRIGONAL PLANAR. 3 electron pairs trigonal planar BF 3 NO OCTET ON Boron THREE ELECTRON PAIRS AROUND THE BORON ATOM MOLECULAR SHAPE FB F F F F F Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -33)250 33)250
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5 Se Se OO SeO 2 is V-SHAPED, OR BENT , O Se O SeO 2 Se O O Se RESONANCE VSEPR treats double bonds like a single bond NOT TRIGONAL PLANAR Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -34)251 34)251
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6 The arrangement for four electron pairs: 109.5° C TETRAHEDRAL 4 electron pairs tetrahedral H H H H Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -35)252 35)252 C H H H H Tetrahedral angle:
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7 NH 3 The electron pairs around the nitrogen is tetrahedral: HN H H There are four electron pairs around the nitrogen atom . N H H H The shape of NH 3 is trigonal pyramidal.
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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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lecture22 (11-27-2006) Ch 10-11 - Chemistry 2A-c F2006...

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