Chapter 8 Bond order resonance expanded octet

Chapter 8 Bond order resonance expanded octet - 5 can exist...

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Draw Lewis Structures for the following compounds: NO BF 3 PCl 5
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Odd Number of Electrons Though relatively rare and usually quite unstable and reactive, there are ions and molecules with an odd number of electrons.
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Fewer Than Eight Electrons • Consider BF 3 : Giving boron a filled octet places a negative charge on the boron and a positive charge on fluorine. This would not be an accurate picture of the distribution of electrons in BF 3 .
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Fewer Than Eight Electrons Therefore, structures that put a double bond between boron and fluorine are much less important than the one that leaves boron with only 6 valence electrons.
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Fewer Than Eight Electrons The lesson is: If filling the octet of the central atom results in a negative charge on the central atom and a positive charge on the more electronegative outer atom, don’t fill the octet of the central atom.
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More Than Eight Electrons • The only way PCl
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Unformatted text preview: 5 can exist is if phosphorus has 10 electrons around it. It is allowed to expand the octet of atoms on the third row or below. Presumably d orbitals in these atoms participate in bonding. 7 PracticeEstimate the enthalpy of the following reaction. 8 PracticeEstimate the enthalpy of the following reaction H 2 ( g ) + O 2 ( g ) H 2 O 2 ( g ) Reaction involves breaking 1 mol HH and 1 mol O=O and making 2 mol HO and 1 mol OO. bonds broken (energy cost) (+436 kJ) + (+498 kJ) = +934 kJ bonds made (energy release) 2(464 kJ) + (142 kJ) = 1070 kJ H rxn = (+934 kJ) + (1070 kJ) = 136 kJ (Appendix H f = 136.3 kJ/mol) Bond Order C O C O C O Longest Bond Weakest Bond Shortest Bond Strongest Bond Bond Order:1 Bond Order:3 Bond Order:2 Bond Order and Resonance Bond lengths: 139 pm Bond order: 1.42...
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This note was uploaded on 11/08/2011 for the course CHM 2045 taught by Professor Geiger during the Fall '08 term at University of Central Florida.

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Chapter 8 Bond order resonance expanded octet - 5 can exist...

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