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

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Chapter 9: Chapter 9: Molecular Geometry Molecular Geometry
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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.
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Background image of page 4
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.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Background image of page 6
7 The VSEPR Model The VSEPR Model 5 Basic Arrangements of Electron Pairs/Domain: 5 Basic Arrangements of Electron Pairs/Domain: No. of electron 
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 36

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

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online