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Lewis Structures and Molecular Shape

Lewis Structures and Molecular Shape. Lewis Dot Diagrams. Lewis Structures and Quantum Mechanics. Valence bond Theory (Pauling): covalent bonds share e - by overlapping orbitals. Draw an orbital diagram to show the bonding in H 2 O. p . 227 #4 p . 230 #3. Lewis Structures.

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Lewis Structures and Molecular Shape

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  1. Lewis Structures and Molecular Shape

  2. Lewis Dot Diagrams

  3. Lewis Structures and Quantum Mechanics Valence bond Theory (Pauling): covalent bonds share e- by overlapping orbitals Draw an orbital diagram to show the bonding in H2O p. 227 #4 p. 230 #3

  4. Lewis Structures • Use the summaries on p. 225 and p. 229 to complete: p. 227 #5, p. 229 #10, 11, p. 230 #4,5 p. 229 #12 (extension)

  5. Draw Lewis diagrams of: Sb Sr2+ Br- CS2 NH4+ HPO32- PCl5

  6. Molecular Shapes and Optical Activity • Unpolarized light (normal light) runs in all directions • Polarization is confining the vibration of a wave to one direction • Polarizer: a filter that only allows light waves in a particular direction to pass • Various shapes will absorb and deflect the polarized light in different ways

  7. Why do molecules take on these shapes? Molecular Shapes

  8. Molecular Shape VSEPR Theory • valence shell e- pairs repel each other electrostatically so as to minimize repulsive forces • lone pairs are bulkier (occupy more space) and repel bonded pairs of e- more strongly Task: Build models of molecules in tables from p. 243-245 in text. Draw 3-D diagrams, write shape name and label bond angles for each molecule.

  9. Homework • p. 246 #1-4 • p. 249 #10,11 • p. 250 #1-3 • p. 247 #9 (extension)

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