1. 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

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

3. 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

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

5. 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

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

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

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

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

10. 4. Trigonal planar
3 bonded atoms + no unshared pairs

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

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

13. 7. Square Planar
4 bonded atoms + 2 unshared pairs

14. 8. Trigonal Bipyramidal
5 bonded atoms + no unshared pairs

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

16. Bond Angles

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

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

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

20. 6.5 Practice Problems
Set E
Set F
p. 202
48-49