lecture15_chem110_sas

lecture15_chem110_sas - Chapter 9: Molecular Geometry and...

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Chapter 9: Molecular Geometry and Bonding Theories CH110 FA11 SAS 1 Prepare for Recitation September 29 th ALEKS Objective 5 due September 27 th ANGEL Quiz 5, September 29 th Lecture 13: September 21 st Lecture 14: September 23 rd Lecture 15: September 26 th Read: Ch. 2.6, 3.3-3.5, 9.1-9.3 Additional Preparation: BLB 3 : 25,29,35,37,51,53; Packet 3 : 1-9 BLB 9 : 23,25,27,38; Packet 9 : 1-7
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CH110 FA11 SAS 2 By the end of Today’s Lecture you should know: VSEPR Theory • Electron pair (electron domain) geometry • Molecular geometry Molecular polarity KEY QUESTIONS: THE BIG PICTURE Chapter 9: Molecular Geometry and Bonding Theories What doe Lewis structures tell us about molecular geometry? What do electron domains and bonding domains tell us about molecular geometry? Remember: structure affects function! How is VSEPR theory used to predict bond geometry? How do polar bonds affect function? How do the different types of bonds ( σ , π ) affect reactivity?
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Conceptual Overview CH110 FA11 SAS 3 Structural Formula Valence e - Lewis structures e - domains Vs. Bonding domains Molecular geometry Identify polar bonds Molecular polarity
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Molecular Geometry and Exceptions to the Octet Rule CH110 FA11 SAS 4 Consider cases with >4 Electron Domains e.g., when central atom has 5 or 6 electron domains Total Electron Domains Bonding Pairs Shape 6 6 octahedral 6 5 square pyramidal 6 4 square planar 5 5 trigonal bipyramidal 5 4 seesaw 5 3 T-shaped 5 2 linear 5 pairs trigonal bipyramidal 6 pairs octahedral
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Trigonal Bipyramidal Electron Domain (# Electron Domains = 5) CH110 FA11 SAS 5 • Four molecular geometries : 1. Trig. bipyramidal if: 2. Seesaw if: 3. T-shaped if: 4. Linear if:
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lecture15_chem110_sas - Chapter 9: Molecular Geometry and...

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