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

Predicting 3-D Molecular Shapes VSEPR THEORY Predicting 3-D Molecular Shapes

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

Nine Molecular Shapes linear bent tetrahedral T-shaped trigonal planar square planar trigonal bipyramidal pyramidal octahedral

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

G. Nine Molecular Shapes linear bent tetrahedral trigonal planar T-shaped square planar trigonal bipyramidal pyramidal octahedral

1. Linear 1bonded atom + any # of unshared pairs 2 bonded atoms + no unshared pairs 7 diatomics: H2, F2, etc. carbon dioxide CO2

2. Bent 2 bonded atoms + 1 or 2 unshared pairs water H20

3. Pyramidal 3 bonded atoms + 1 unshared pair ammonia NH3

4. Trigonal planar 3 bonded atoms + no unshared pairs

5. T-shaped 3 bonded atoms + 2 unshared pairs

6. Tetrahedral 4 bonded atoms + no unshared pair methane CH4

7. Square Planar 4 bonded atoms + 2 unshared pairs

8. Trigonal Bipyramidal 5 bonded atoms + no unshared pairs

9. Octahedral 6 bonded atoms (8 faces) + no unshared pairs

Bond Angles

Interpreting Graphics Bonus Consider doing this bonus on molecular shapes #8 on the bonus is a “bonus within a bonus”!!!

VSEPR and Molecular Geometry Chapter 6 Section 5 Molecular Geometry VSEPR and Molecular Geometry

VSEPR and Molecular Geometry Chapter 6 Section 5 Molecular Geometry VSEPR and Molecular Geometry

6.5 Practice Problems Set E Set F p. 202 48-49