LAB THIS WEEK EXAM #4 THIS FRIDAY! TODAY’S TOPICS Molecular Shape (8.6) Molecular Polarity (8.7) November 30, 2009.

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Presentation transcript:

LAB THIS WEEK EXAM #4 THIS FRIDAY! TODAY’S TOPICS Molecular Shape (8.6) Molecular Polarity (8.7) November 30, 2009

Molecular Geometry = Electron Pair Geometry, ignoring lone pairs BF 3 and O 3

Molecular Geometry = Electron Pair Geometry, ignoring lone pairs

Lone pairs always go in equatorial sites Molecular Geometry = Electron Pair Geometry, ignoring lone pairs

What is the molecular geometry of NO 2 - ? 1. Linear 2. Bent 3. Trigonal planar 4. Tetrahedral 5. Trigonal pyramid 6. T-shaped 7. Square pyramid 8. Square planar 9. octahedral

What is the molecular geometry of … 1. Linear 2. Bent 3. Trigonal planar 4. Tetrahedral 5. Trigonal pyramid 6. T-shaped 7. Square pyramid 8. Square planar 9. octahedral

What is the molecular geometry of … 1. Linear 2. Bent 3. Trigonal planar 4. Tetrahedral 5. Trigonal pyramid 6. T-shaped 7. Square pyramid 8. Square planar 9. octahedral

What is the molecular geometry of … 1. Linear 2. Bent 3. Trigonal planar 4. Tetrahedral 5. Trigonal pyramid 6. T-shaped 7. Square pyramid 8. Square planar 9. octahedral

Molecular Polarity Polarity = uneven distribution of charge  Bond polarity = Electrons drawn closer to the more electronegative atom  Molecular polarity = Molecule as a whole has a net separation of charge  A polar molecule must have polar bonds  A molecule is polar if the directions of the polar bonds don’t cancel/offset eachother  Nonpolar Examples: CH 4, CO 2  Polar Examples: H 2 O, NH 3