Chapter 9_May11

# Chapter 9_May11 - Chapter 9 Chapter Molecular Geometry...

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1 Chapter 9: Chapter 9: Molecular Geometry Molecular Geometry

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2 Learning Outcomes Learning Outcomes Student should be able to use Lewis structure to determine the electron domain geometry and the molecular shape of a compound.
3 Molecular Shapes Molecular Shapes Lewis electron-dot structures: - give us the connectivity between atoms. - is drawn with atoms in the same plane. e.g. Lewis structure of CF 4 shows 4F atoms bonded to a central C atom. C F F F F

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4 The actual 3D arrangement of the atoms has F atoms at the corners of a tetrahedron . (4 corners, 4 faces, each which is an equilateral triangle) The overall shape of a molecule is determined by its bond angle. In CF 4 : all 6 C-F angles = 109.5 o - characteristic of tetrahedron. 109.5 o
5 The VSEPR Model The VSEPR Model V alence S hell E lectron P air R epulsion Theory (think in 3D) Developed by Ron Gillespie and István Hargittai in 1957. Assumption : electron pair repel, so the bonding pairs and lone pairs attached to a central atom are located as far apart from each other as possible. Bonding pair of electron: a region/domain in which it is most likely to find electrons. Nonbonding pair/lone pair: an electron domain that is located principally on 1 atom.

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6 e.g. Electron domain geometry : arrangement of electron pairs/domains around the central atom. Molecular geometry : arrangement of atoms around the central atom. When describing shapes of molecules - give the molecular geometry rather than electron domain geometry. N H H H Non bonding pair/lone pair electron All the N-H bonds involve bonding electron pairs
7 The VSEPR Model The VSEPR Model 5 Basic Arrangements of Electron Pairs/Domain: 5 Basic Arrangements of Electron Pairs/Domain: No. of electron

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Chapter 9_May11 - Chapter 9 Chapter Molecular Geometry...

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