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Important Information:
Sec 6.5 Practice Problems: Set E-F, p. 202 (48-49) Activity- VSEPR: Predicting Molecular Shapes due Wednesday Study Guide: 6.5 – due Wednesday Correct 6.5 Reading Guide Chapter 6 Test Thursday
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Predicting 3-D Molecular Shapes
VSEPR THEORY Predicting 3-D Molecular Shapes
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VSEPR Theory: Valence Shell Electron Pair Repulsion Theory
The repulsion between e- pairs causes molecular shapes to adjust so that valence e- pairs stay as far apart as possible
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Nine Molecular Shapes linear bent tetrahedral T-shaped trigonal planar
square planar trigonal bipyramidal pyramidal octahedral
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Using VSEPR Theory to predict Molecular Shape
determined by central atom determined by bonded atoms and unbonded pairs on central atom unshared e- (unbonded) lone pairs important in predicting shape unshared e- held closer to nucleus than bonding pairs unshared pairs strongly repel bonding pairs pushing them together
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G. Nine Molecular Shapes
linear bent tetrahedral trigonal planar T-shaped square planar trigonal bipyramidal pyramidal octahedral
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1. Linear 1bonded atom + any # of unshared pairs
2 bonded atoms + no unshared pairs 7 diatomics: H2, F2, etc. carbon dioxide CO2
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2. Bent 2 bonded atoms + 1 or 2 unshared pairs water H20
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3. Pyramidal 3 bonded atoms + 1 unshared pair ammonia NH3
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4. Trigonal planar 3 bonded atoms + no unshared pairs
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5. T-shaped 3 bonded atoms + 2 unshared pairs
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6. Tetrahedral 4 bonded atoms + no unshared pair methane CH4
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7. Square Planar 4 bonded atoms + 2 unshared pairs
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8. Trigonal Bipyramidal 5 bonded atoms + no unshared pairs
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9. Octahedral 6 bonded atoms (8 faces) + no unshared pairs
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Bond Angles
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Interpreting Graphics Bonus
Consider doing this bonus on molecular shapes #8 on the bonus is a “bonus within a bonus”!!!
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VSEPR and Molecular Geometry
Chapter 6 Section 5 Molecular Geometry VSEPR and Molecular Geometry
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VSEPR and Molecular Geometry
Chapter 6 Section 5 Molecular Geometry VSEPR and Molecular Geometry
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6.5 Practice Problems Set E Set F p. 202 48-49
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