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Part 2:Molecular Geometry

Lesson 4 – Lewis Diagrams and Molecular Geometry. Part 2:Molecular Geometry. PREDICTING MOLECULAR SHAPE. V alence Shell Electron Pair Repulsion Theory Electron pairs orient themselves in order to minimize repulsive forces. Lone pairs repel more strongly than bonding pairs!!!. VSEPR Theory.

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Part 2:Molecular Geometry

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  1. Lesson 4 – Lewis Diagrams and Molecular Geometry Part 2:Molecular Geometry C. Johannesson

  2. PREDICTING MOLECULAR SHAPE • Valence Shell Electron Pair Repulsion Theory • Electron pairs orient themselves in order to minimize repulsive forces. C. Johannesson

  3. Lone pairs repel more strongly than bonding pairs!!! VSEPR Theory • Types of e- Pairs • Bonding pairs - form bonds • Lone pairs - nonbonding e- C. Johannesson

  4. Bond Angle VSEPR Theory • Lone pairs reduce the bond angle between atoms. C. Johannesson

  5. Know the 5 common shapes & their bond angles! Determining Molecular Shape • Draw the Lewis Diagram. • Tally up e- pairs on central atom. • double/triple bonds = ONE pair • Shape is determined by the # of bonding pairs and lone pairs. C. Johannesson

  6. BeH2 Common Molecular Shapes 2 total 2 bond 0 lone Atoms connected in straight line LINEAR 180° C. Johannesson

  7. BF3 Common Molecular Shapes TRIGONAL PLANAR 120° 3 total 3 bond 0 lone Triangular Flat shape C. Johannesson

  8. CH4 Common Molecular Shapes TETRAHEDRAL 109.5° 4 total 4 bond 0 lone Shape has 4 surfaces C. Johannesson

  9. NH3 Common Molecular Shapes TRIGONAL PYRAMIDAL 107° 4 total 3 bond 1 lone Triangular shape (not flat) C. Johannesson

  10. H2O Common Molecular Shapes BENT 104.5° 4 total 2 bond 2 lone Non linear C. Johannesson

  11. Problems • Draw the Lewis Structure, predict the shapeand determine the number of lone pair electrons for each of the following molecules: • CCl46. PCl3 • BF37. OF2 • BeCl28. CF4 • H2S 9. NH3 • NF310. BH3

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