13CHM11509 full lecture - CHM 115 Dr. Hilkka Kenttmaa...

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Unformatted text preview: CHM 115 Dr. Hilkka Kenttmaa Lecture 13 Reading was 9.7: Molecular Shapes Lecture 14: 11.1-11.4: Organic Compounds Next lab: VESPR Theory Last Lecture Lewis structures Formal charges Resonance Lewis Structures NOCl 1. Choose the central atom (forms most bonds) 2. Draw bonds to other atoms 3. Count valence electrons 4. Count the remaining electrons 5. Distribute them as lone pairs and/or multiple bonds 6. Verify that all atoms have 8 electrons Lewis Structures O-N-Cl 1. Choose the central atom 2. Draw bonds to other atoms 3. Count valence electrons 4. Count the remaining electrons 5.Distribute them as lone pairs and/or multiple bonds 6.Verify that all atoms have 8 electrons Lewis Structures O-N-Cl 1. Choose the central atom 2. Draw bonds to other atoms 3. Count valence electrons 4. Count the remaining electrons 5.Distribute them as lone pairs and/or multiple bonds 6.Verify that all atoms have 8 electrons 6 + 5 + 7 = 18 Lewis Structures O-N-Cl 1. Choose the central atom 2. Draw bonds to other atoms 3. Count valence electrons 4. Count the remaining electrons (after bonds) 5.Distribute them as lone pairs and/or multiple bonds 6.Verify that all atoms have 8 electrons 6 + 5 + 7 = 18 18 4 = 14 Lewis Structures O N-Cl 1. Choose the central atom 2. Draw bonds to other atoms 3. Count valence electrons 4. Count the remaining electrons (after bonds) 5.Distribute them as lone pairs and/or multiple bonds 6.Verify that all atoms have 8 electrons 18 4 = 14 Lewis Structures O N-Cl 1. Choose the central atom 2. Draw bonds to other atoms 3. Count valence electrons 4. Count the remaining electrons (after bonds) 5.Distribute them as lone pairs and/or multiple bonds 6.Verify that all atoms have 8 electrons Formal Charge = # valence e- in unbound atom- # non-bonding e- # bonds- Formal Charges Formal Charge = # valence e- in unbound atom- # non-bonding e- # bonds- Formal Charges 6 6 1 = -1- Resonance If we can write two or more valid Lewis structures, the actual electron distribution is an average of the distributions shown by the Lewis structures. NOTE!!!!! The double bond moves, NOT the atoms ....
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This note was uploaded on 02/06/2012 for the course CHM 115 taught by Professor Towns during the Spring '08 term at Purdue University-West Lafayette.

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13CHM11509 full lecture - CHM 115 Dr. Hilkka Kenttmaa...

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