Lecture 16_2 slides per page - Lecture16 CHMY141 Spring2016...

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2/24/2016 1 Lecture 16 CHMY 141 Spring 2016 Resonance The covalent bonds that have been drawn and studied previously have made the assumption that the bonding is localized This means that the electrons in a bond are always between the same two atoms This doesn’t always happen There are several molecules that have options as to where a double bond forms This is delocalized bonding or Resonance
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2/24/2016 2 Resonance The actual structure is a hybrid of the various structures Resonance structures lower the potential energy of the structure – resonance stabilization Examples SO 2 NO 3
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2/24/2016 3 Formal Charge How do we determine the best Lewis dot structure when there appear to be several possibilities or when we need to determine where to assign a multiple bond? (i.e. in COBr 2 ) The answer is: By using a concept called formal charge The formal charge of the atoms in a molecule let us distinguish the most stable conformation.
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