VSEPR Theory - PowerPoint PPT Presentation

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VSEPR Theory

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  1. VSEPR Theory

  2. Bellwork 04/25 • Draw the Lewis dot structure of H2S. What kind of bonding does this compound have?

  3. VSEPR Theory • Valence Shell Electron Pair Repulsion Theory • the repulsion between electron pairs causes molecular shapes to adjust so the valence electron pairs stay as far apart as possible • “Same charges repel!!” • Atoms exist at fixed angles to each other  bond angle (e- always want to maximize this angle!) • Example: CH4

  4. How to Predict Shapes • Draw Lewis dot structure of compound • Check valence electrons and bonds • Make sure to include all lone pairs of e- • Especially on central atom!! • Identify the shape of the molecule

  5. Linear • Br2

  6. Linear • CO2

  7. Trigonal Planar • BF3

  8. Bent • H2O • 3 atoms…. • Why not linear?

  9. Pyramidal • NH3

  10. Tetrahedral • CH4

  11. Trigonal Bipyramidal • PCl5

  12. Octahedral • SF6