chapter8 - 8 Molecular Molecular Structure & Covalent...

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olecular Molecular Structure & 8 Covalent Bonding Theories
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hapter Goals Chapter Goals 1. A Preview of the Chapter 2. Valence Shell Electron Pair Repulsion (VSEPR) Theory . olar Molecules:The Influence of shape 3. Polar Molecules:The Influence of shape 4. Valence Bond (VB) Theory Molecular Shapes and Bonding 5. Linear electronic arrangement: AB2 Species 6. Trigonal Planar electronic arrangement: AB3 Species 2
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hapter Goals Chapter Goals Molecular Shapes and Bonding 7. Tetrahedral electronic arrangement: AB4 Species . etrahedral electronic arrangement: AB3U 8. Tetrahedral electronic arrangement: AB3U Species etrahedral electronic arrangement: AB2U2 9. Tetrahedral electronic arrangement: AB2U2 Species 0 etrahedral electronic arrangement BU3 10. Tetrahedral electronic arrangement – ABU3 Species 3 11. Trigonal Bipyramidal Geometry 12. Octahedral Geometry
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hapter Goals Chapter Goals Molecular Shapes and Bonding 13. Compounds Containing Double Bonds 14. Compounds Containing Triple Bonds 5 Summary of Electronic and Molecular 15. A Summary of Electronic and Molecular Geometries 4
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tereochemistry Stereochemistry Stereochemistry is the study of the three dimensional shapes of molecules. Some questions to examine in this hapter are: chapter are: 1. Why are we interested in shapes? 2. What role does molecular shape play in life? . ow do we determine molecular shapes? 3. How do we determine molecular shapes? 4. How do we predict molecular shapes? 5
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Two Simple Theories of Covalent Bonding • Valence Shell Electron Pair Repulsion Theory – Commonly designated as VSEPR – Principal originator • R. J. Gillespie in the 1950’s alence Bond Theory Valence Bond Theory – Involves the use of hybridized atomic orbitals rincipal originator – Principal originator • L. Pauling in the 1930’s & 40’s 6
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verview of Chapter Overview of Chapter The same basic approach will be used in every example of molecular structure prediction: 1. Draw the correct Lewis dot structure. Identify the central atom. Designate the bonding pairs and lone pairs of electrons on central atom. 2. Count the regions of high electron density on the central atom. Include both bonding and lone pairs in the counting. 7
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verview of Chapter Overview of Chapter 3. Determine the electronic arrangement around the central atom. VSEPR is a guide to the geometry. etermine the hape round the central 4. Determine the shape around the central atom. Ignore the lone pairs of electrons. djust shape for effect of any lone pairs 5. Adjust shape for effect of any lone pairs. 8
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verview of Chapter Overview of Chapter 6. Determine the hybrid orbitals on central atom. 7. Repeat procedure if there is more than ne central atom in molecule one central atom in molecule. 8. Determine molecular polarity from entire shape using electronegativity ifferences. differences.
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This note was uploaded on 05/24/2011 for the course ENGINEERIN 1 taught by Professor Lee during the Spring '11 term at Sungkyunkwan.

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chapter8 - 8 Molecular Molecular Structure & Covalent...

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