Chapter 10 2 Jan 15 2010

Chapter 10 2 Jan 15 2010 - Chemistry 1B10W: Professor...

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10-1 Chapter 10: The Shapes of Molecules 10.2 Valence-Shell Electron-Pair Repulsion (VSEPR) Theory and Molecular Shape Chemistry 1B10W: Professor Rettig - Chapter 10, Lecture 2, Jan. 15, 2010 Announcements: 1. ARIS Homework Chapter 9 due tonight at 11 pm PST. 2. ARIS and Recommended Homework for Chapter 10 is on iLearn now - see Schedule/Homework Assign. Due Wednesday Jan. 20, 11 pm. Review: Chapter 9 - Electronegativity 10.3 Molecular Shape and Molecular Polarity Note: the lab next week is all about molecular shapes and you will build models of these shapes – same kind of models used in lecture.
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10-2 Figure 10.2 Electron-group repulsions and molecular shapes linear trigonal planar tetrahedral trigonal bipyramidal octahedral Show movie here These are the areas of space preferentially occupied by electrons
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10-3 Figure 10.3 The Single Molecular Shape Of The Linear Electron-group Arrangement Examples: CS 2 , HCN, BeF 2 Note: later we will show how to PREDICT the shape that is preferred by a particular Lewis-type structure.
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10-4 Figure 10.4 The Two Molecular Shapes Of The Trigonal Planar Electron Group Arrangement Class Shape
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10-5 Factors Affecting Actual Bond Angles Bond angles are consistent with theoretical angles when the atoms attached to the central atom are the same and when all electrons are bonding electrons of the same order (e.g CH 4 , BH 3, PF 5 ). ideal 120 o 120 o larger EN greater electron density 122 o 116 o real Lone pairs repel bonding pairs more strongly than bonding pairs repel each other. Sn Cl Cl 95 o Effect of Double Bonds Effect of Nonbonding (Lone) Pairs C O H H C O H H Fine tuning of angles:
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10-6 Figure 10.5 The Three Molecular Shapes Of The Tetrahedral Electron-group Arrangement Note: don’t have to “memorize” these – you follow “rules” on slide 11 to derive these answers and others like them.
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This note was uploaded on 03/18/2010 for the course CHEM1B CHEM1B taught by Professor Padsofj during the Spring '10 term at UC Riverside.

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Chapter 10 2 Jan 15 2010 - Chemistry 1B10W: Professor...

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