CH 101 notes 9-26

CH 101 notes 9-26 - s pz px py x z Ammonia (NH3) bonding...

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s p z p x p y z x Hybrid orbitals Pure orbital sp 2 sp 2 sp 2 •lone pairs Used for: σ bonds Used for: π bonds Section 6.4 Ammonia (NH 3 ) bonding s p x p y p z N 3H sp 3 sp 3 sp 3 sp 3 N s s s N H H H σ bond Pure atomic orbitals Hybridize Tetrahedrally distributed Hybrid orbitals sp 3 sp 3 sp 3 sp 3 Section 6.4 Formaldehyde (CH 2 O) bonding psp 2 sp 2 sp 2 C 2H s s s p x p y p z C Pure atomic orbitals Section 6.4 Hybridize Hybrid orbitals p y sp 2 sp 2 sp 2 O H H C O C C HH sp 2 x z p y p y σ− bond σ− bond Section 6.4 C C sp 2 σ− bond σ− bond π− bond H H H H x z p y p y y z Section 6.4 p x p x C N H sp sp σ− bond σ− bond lone pair z x p y p y ab c Describe electron regions Section 6.4
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C N H sp sp π− bond (x) z x p x p x p y p y π− bond (y) Section 6.4 The number of electron regions around an atom: 2 # e - regions = # σ bonds + # LPs 3 4 sp sp 2 sp 3 # e - regions hybridization # pure p 2 1 0 Section 6.4 How many σ bonds does this molecule have? How many π bonds does this molecule have? C C H H H C N . . acrylonitrile Section 6.4 How many sp 2 centers does this molecule have? How many sp centers does this molecule have? How many unhybridized p orbitals are in this molecule? C C H H H C N . . acrylonitrile Section 6.4 O H H H H H H H H H H H H H N C C C C C C H H H C H H H C C C C C C H H H C C O C H H H C C A B C D E 1 2 3 4 5 6 What are the hybridizations, angles and shapes of centers 1-6? What are the bond orders for A-D? Section 6.4 Exam Format Q & A Exam 2 has 28 multiple choice questions. Exam 2 covers lecture material presented concerning chapters 4-6.4 and HW# 6-10 (and the HW#2 bonus). The cover sheets are being shown in today’s and Fridays’s lecture. It’s the same information as on the posted practice Exam 2. Your best study strategy is to review the homeworks and then test your knowledge with the practice exam(s). Make sure you can recall information quickly. You only have 50 minutes (1.75 minutes/question). Exam 2: Monday, October 1, 2007
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This note was uploaded on 06/08/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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CH 101 notes 9-26 - s pz px py x z Ammonia (NH3) bonding...

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