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Molecular Geometry and Polarity

Molecular Geometry and Polarity. Molecular Shapes. Molecular shape determines chemical and physical properties Electrons repel each other resulting in the molecular shape Lone pairs are not shared between protons and therefore repel slightly more. Hybridization. Atomic orbitals mix

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Molecular Geometry and Polarity

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  1. Molecular Geometry and Polarity

  2. Molecular Shapes • Molecular shape determines chemical and physical properties • Electrons repel each other resulting in the molecular shape • Lone pairs are not shared between protons and therefore repel slightly more

  3. Hybridization • Atomic orbitals mix to form new identical orbitals

  4. Determine Molecular Geometry and Hybridization • BF3 • NH4+ • OCl2 • BeF2 • CF4 • CS2 • CCl2F2 • NCl3

  5. Bond Polarity • Unequal sharing of electrons due to differences in electronegativity

  6. 0 - 0.4 0.5 - 1.7 Above 1.7

  7. Molecular Polarity

  8. Molecular Polarity • Molecules that are symmetrical tend to be nonpolar covalent molecules • Molecular Dipole-the overall direction of pull on the molecule

  9. PHET Simulation • Draw the following molecules and label the dipole of the molecule

  10. Properties of Covalent Compounds • Low melting and boiling points

  11. Properties of Covalent Compounds • Many molecules exist as gases • Soft solids • Paraffin

  12. Properties of Covalent Compounds • Poor Conductors of Electricity

  13. Review Problems: pg. 272 #72, 84, 89-92, 95, 96, 97 (a-c), 98 (a, c), 99, 102, 104, 105-117odds

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