lecture18_chem110_sas

lecture18_chem110_sas - Chapter 9: Molecular Geometry and...

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Unformatted text preview: Chapter 9: Molecular Geometry and Bonding Theories with examples from Chapter 25: Organic Chemistry CH110 FA11 SAS 1 Exam 2 Monday, October 10, 2011, 6:30 PM Prepare for Recitation October 6 th ALEKS Objective 6 due October 4 th ANGEL Quiz 6, October 6 th Lecture 16: September 28 th Lecture 17: September 30 th Lecture 18: October 3 rd Read: Ch. 2.9, 9.4-9.6, 25.1 Additional Preparation: BLB 9 : 43,50,57; Packet 9 : 8-17 BLB 25 : 11,12,25 CH110 FA11 SAS 2 By the end of Todays Lecture you should know: Valence Bond Theory (molecular orbitals) Sigma bonds Pi bonds Localized vs. delocalized pi bonds and resonance Delocalization and reactivity 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 (, ) affect reactivity? Review: Forming Hybrid Orbitals CH110 FA11 SAS 3 Problem: Atomic orbitals (s, p, d, f) dont have shapes consistent with bonding shapes observed in molecules. Solution: Mix atomic orbitals to yield a set of __________ orbitals that are hybrids of atomic orbitals. Example: Hybrid Orbitals in Alkanes CH110 FA11 SAS 4 What is the relative energy of each sp 3 ? C H H H C H H H The carbons in alkanes are sp 3 hybridized: Example: Ethane e- domains: e- geometry: Carbon Hybrid: Bond Angles: For each carbon center: For the whole molecule: # sigma bonds: # pi bonds: Reactions of Alkanes CH110 FA11 SAS...
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lecture18_chem110_sas - Chapter 9: Molecular Geometry and...

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