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15-bonding - Bonding General Concepts More on Lewis...

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1 Week 6 CHEM 1310 - Sections L and M 1 Bonding: General Concepts More on Lewis Structures Formal Charges Resonance Breakdown of the Octet Rule VSEPR Theory Steric Number Chapter Review Week 6 CHEM 1310 - Sections L and M 2 Formal Charges For some compounds, there are different Lewis structures possible. How can we tell which is the correct Lewis structure? Consider the formal charge… Image from chemprofessor.com
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2 Week 6 CHEM 1310 - Sections L and M 3 Formal Charge Formal Charge = # valence e - on free atom - # valence e - assigned to the atom in the molecule # valence e - assigned to the atom in the molecule = # lone pair e - + 0.5 x (# shared e - ) Week 6 CHEM 1310 - Sections L and M 4 Formal Charge Formal Charge = # valence e - on free atom - # valence e - assigned to the atom in the molecule # valence e - assigned to the atom in the molecule = # lone pair e - + 0.5 x (# shared e - ) What is the formal charge on Nitrogen in this compound?
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3 Week 6 CHEM 1310 - Sections L and M 5 Formal Charge Formal Charge = # valence e - on free atom - # valence e - assigned to the atom in the molecule # valence e - assigned to the atom in the molecule = # lone pair e - + 0.5 x (# shared e - ) # valence e - on free N = 5 1 lone pair e - 0.5 x (6 shared e - ) = 3 5 - (1+3) = 5-4 = +1 Week 6 CHEM 1310 - Sections L and M 6 Resonance Resonance is a way to depict average of multiple Lewis structures O O O O O O Electrons are not moving…representation means real structure is average of these extremes
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