lecture21 (11-17-2006) Ch 10

lecture21 (11-17-2006) Ch 10 - Chemistry 2A-c F2006...

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1 H C N Writing Lewis (e - -dot) Structures HN C Example Example : HCN and HNC : HCN and HNC Valence electrons: Valence electrons: Shorthand: Shorthand: H C N H C N e - -dot structure: Another structure: Another structure: H N C H N C or or HC N Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -12)229 12)229 + + - -
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2 Calculate formal charge for: = 4 - 0 - 1/2 (8) = 0 _ 1/2#shared electrons {} Formal charge = #valence electrons _ #unshared electrons { } = 5 - 1/2 (6) = 0 FC on C FC on N - 2 FC on H = zero HC N . FORMAL CHARGE (FC): Indicates the extent to which atoms have gained or lost electrons in the process of covalent bond formation. Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -13)230 13)230
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3 Calculate formal charge for: FC on C = 4 - 2 - 1/2 (6) = -1 _ 1/2#shared electrons {} Formal charge = #valence electrons _ #unshared electrons { } FC on N = 5 - 0 - 1/2 (8) = +1 HN C . = zero Structures with the lowest formal charges are likely to have the lowest energy. Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -14)231 14)231 HC N C FC on H 0 0 0 0 0 0 0 +1 0 +1 -1
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4 r triple bond < r double bond < r single bond Bond Length for A-B : The equilibrium distance between A and B. Bond Energy: The energy need to break the bond AB A + B ΔΕ BE triple bond > BE double bond > BE single bond The strength of a bond is measured by. .. Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -15)232 15)232 N N N N O=O O=O F F - - F F
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5 QUESTION Oxygen difluoride is a powerful oxidizing and fluorinating agent. Select its Lewis structure O FF 1 O F F 2 O F F 3 O F F 4 5 None of these Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch10 (Ch10 -16)233 16)233
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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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lecture21 (11-17-2006) Ch 10 - Chemistry 2A-c F2006...

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