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Lecture 25 October 24 2008 - Announcements October29...

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Announcements Chapter 7 Homework due Wednesday  October 29 Chapter 8 Homework due Monday  November 3 Chapter 8 “Molecules and Materials” start  on Monday  READ SECTIONS 8-1 to 8-5 for Monday Chapter 9 “Energy and Chemistry”   introduce next Friday Next Exam November 12 on Chapters 7, 8  and 9
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Predicting Molecular Shapes of Electron-Dot  Structures: VESPR Model Approximate shape of electron dot structure is given  by the Valence-Shell Electron Pair Repulsion  (VESPR) Model Step 1:  Draw Lewis Structure Step 2:  Count the total electron “charge clouds”  surrounding central atom Charge cloud:  group of electrons either in a bond  or a lone pair Step 3:  Predict the arrangement of electron “charge  clouds” by positioning them to maximize separation Step 4:  Consider effect of lone pairs
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Summary of Molecular Shapes Predicted by  VSEPR Model Electron Groups Lone Pairs Bonds Geometry Examples 2 0 2 Linear BaCl 2 3 3 0 1 3 2 Trigonal planar Bent BF 3 SO 2 4 4 4 0 1 2 4 3 2 Tetrahedral Trigonal pyramidal Bent CH 4 NH 3 H 2
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