Homework 6 Key

Homework 6 Key - CHEMISTRY 201X: Homework #6 "Chemical...

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CHEMISTRY 201X: Homework #6 Due : Friday, November 2, 2007 “Chemical Bonding and Reactions” (1) (12 points) For each of the following molecules or molecular ions, predict its molecular structure, the number of electron-pair domains, whether it is a polar or nonpolar molecule, and the hybridization at the central atom: Electron Counting Lewis Structure # Electron- Pair Domains Polar/Nonpolar Hybridization IF 5 : 7+5(7)=42 e = 21 electron pairs F I F F F F (5 I-F bond pairs, 15 lone pairs at the 5 F atoms – not shown, 1 lone pair at I; there are two sets of 3-(F-I-F)center, 4-electron bonds ) 6 domains (octahedral) 5 ligands – square pyramidal structure Polar molecule ( sp ) pp : 2 F-I-F 3-center, 4- electron bonds; sp hybrids use for 2-center, 2- electron bond and lone pair at I. SOCl 2 : 6 + 6 + 2(7) = 26 electrons = 13 electron pairs O S Cl Cl O S Cl Cl (+1) ( 1) (2 S-Cl bond pairs, 1 S-O bond pair, 6 lone pairs at Cl, 3 lone pairs at O, 1 lone pair at S; OR 2 S-Cl bond pairs, 2 S-O bond pairs, 6 lone pairs at Cl, 2 lone pairs at O; formal charges for atoms when not 0 are labeled. ) There are 2 Lewis structures acceptable, and both are reasonable (O is more electronegative than S). 3-4 domains (trigonal planar - tetrahedral) 3 ligands – trigonal pyramidal structure (between planar and tetrahedral) Polar molecule sp 3 – ( sp 2 ) p I 3 : 3(7) + 1 = 22 electrons = 11 electron pairs III (2 I-I bond pairs, 9 lone pairs at I. There is one 3-center (I-I-I), 4-electron bond. ) 5 domains (trigonal bipyramidal) 2 ligands – linear structure Nonpolar molecule ( sp 2 ) p : 1 I-I-I 3-center, 4- electron bond; sp 2 hybrids
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This homework help was uploaded on 03/27/2008 for the course CHEM 201 taught by Professor Miller during the Fall '07 term at Iowa State.

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Homework 6 Key - CHEMISTRY 201X: Homework #6 "Chemical...

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