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Chemical Bonding and Molecular Structure Chapter 12 Sec 12.8 - 12.10

Chemical Bonding and Molecular Structure Chapter 12 Sec 12.8 - 12.10. Goals: . To use Lewis Structures as a way to predict the geometry of Molecules Determine if molecules are polar or nonpolar. VSEPR Model. Valence Shell Electron Pair Repulsion Model

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Chemical Bonding and Molecular Structure Chapter 12 Sec 12.8 - 12.10

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  1. Chemical Bondingand Molecular Structure Chapter 12 Sec 12.8 - 12.10

  2. Goals: • To use Lewis Structures as a way to predict the geometry of Molecules • Determine if molecules are polar or nonpolar

  3. VSEPR Model • Valence Shell Electron Pair Repulsion Model • Bonds (pairs of electrons) attempt to move as far away as possible from one another in a molecule

  4. This explains the Geometry of H2O Water is a “bent” molecule, because of the lone pairs around the central Oxygen atom

  5. Various Geometry of Molecules See Examples on Next Slides (Hand-Out)

  6. Polar or Non-polar Molecule? A molecule may have polar covalent bonds and not be polar overall ????????? Geometry must also be considered

  7. Ammonia (NH3) is polar • The bonds between hydrogen and nitrogen are polar covalent (∆EN = .87) • Pyramidal geometry of molecule points charges toward N

  8. Carbon Dioxide is Non-polar Even though the bonds between carbon and oxygen are polar covalent (∆EN = 1.0), the pull of electrons is in equal and opposite directions because CO2 is linear

  9. Water is Wacky! Water has some strange properties due to its structure

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