Chemistry 141 Friday, November 17, 2017 Lecture 31

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Presentation transcript:

Chemistry 141 Friday, November 17, 2017 Lecture 31 Chemistry 11 - Lecture 11 9/30/2009 Chemistry 141 Friday, November 17, 2017 Lecture 31 VSEPR and Hybridization

Questions for today: What are the 3-dimensional shapes of molecules? Why do molecules have these shapes? What is a covalent bond? How can we understand molecular shapes in terms of orbitals?

Electron-Domain Geometries

Electron Domain and Molecular Geometries

Electron Domain and Molecular Geometries

Electron Domain and Molecular Geometries

Electron Domain and Molecular Geometries

Polarity of Molecules A NONPOLAR molecule A POLAR molecule

Orbital overlap and bonding

Hybrid orbitals SN=4  tetrahedral (Example: CH4)

sp2 hybrid orbitals SN=3  trigonal planar (Example: BCl3)

Hybrid orbitals for linear geometry SN=2  linear (Example: BeCl2)

dsp3 hybrid orbitals SN=5  trigonal bipyramidal (Example: PCl5)

Hybrid orbitals and bonding for other SNs SN=6  octahedral (Example: SF6)

Hybridization summary