Lecture17_chem110_sa - Chapter 9 Molecular Geometry and Bonding Theories with examples from Chapter 25 Organic Chemistry CH110 FA11 SAS 1 Exam 2

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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 Today’s Lecture you should know: Valence Bond Theory (molecular orbitals) Hybrid Orbitals KEY QUESTIONS: THE BIG PICTURE Are all covalent bonds the same? What is the difference between a σ bond and a π bond? What is a hybrid orbital? Remember: structure affects function! How is VSEPR theory used to predict organic bond geometry? How is valence bond theory used to predict organic bond geometry? Can the two be used to rationalize the structure of organic molecules? Chapter 9: Molecular Geometry and Bonding Theories with examples from Chapter 25: Organic Chemistry Atomic Orbitals Do NOT Explain Everything CH110 FA11 SAS 3 Consider CH 4 How many σ-bonds? How many π-bonds? Problem: VSEPR shape and atomic orbital shape are not compatible! 1s 2 2s 2 2p 2 C C H H H H 109.5 ° Hybrid Orbitals in Methane CH110 FA11 SAS 4 Step 1 1s 2 2s 2 2p 2 C electron promotion 1s 2 2s 1 2p 3 C* Electron promotion: • Requires _______ • now have 4 ________ electrons on C (* = excited state configuration) Hybrid Orbitals in Methane CH110 FA11 SAS 5 Step 2 The 4 (half-filled) atomic orbitals mix to form a new set of (half-...
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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Lecture17_chem110_sa - Chapter 9 Molecular Geometry and Bonding Theories with examples from Chapter 25 Organic Chemistry CH110 FA11 SAS 1 Exam 2

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