1. The end of the semester is tiring – hang in there!
Be respectful – no electronics please!
Announcements
The end of the semester is tiring – hang in there!
Exam 3 is on Thursday April 25 at 7:00 pm! (Conflict at 5:00 pm)
Sign up for conflict in 1026 CA
Please let me know by this Thursday about conflicts to the conflict
Lab due Friday in discussion
Lon-Capa HW 7 due tomorrow 10:00 pm
Pre-lecture assignments due Tuesdays & Thursdays at 8 am as usual
Workshop 2 due Monday at beginning of Lab

2. Chem 101: Last 4 Weeks Calendar
Monday
Tuesday
Wednesday
Thursday
Friday 8 9 10 11 12 15 16 17 18 19 22 23 24 25 26 29 30 1 2 3 6 7
Today
Exam 3
Reading
Day
101A
Final

3. Overall goal: Atomic Structure Chemical Bonding 3D Molecular Structure
Molecular Properties

4. Overall goal: Atomic Structure Chemical Bonding 3D Molecular Structure
Molecular Properties

5. Clicker #1
We drew the Lewis structures for BF3 and NF3. What are the molecular shapes of each of these molecules?
BF3
NF3 a)
Trigonal planar
Trigonal pyramid b)
Tetrahedral c) d) e)

6. Clicker #2
The correct Lewis structure for IF3 has ____ lone pairs around the central atom.
a) 0
b) 1
c) 2
d) 3
e) 4

7. Joke
Is helium male?
Of course He is!

9. Five Effective Pairs: Trigonal Bipyramid Geometry
T-shape
Trigonal bipyramid
See-saw
Linear

10. See-saw

11. Six Effective Pairs: Octahedral Geometry
Square pyramid
Square planar
Octahedral

12. Octahedron

13. Clicker #3 a) 1 & 2 b) 1 & 3 c) 1 & 4 d) 1 & 5 e) 1 & 6
Where would it be best to place the chlorine atoms in SF4Cl2 to make this a nonpolar molecule?
a) 1 & 2
b) 1 & 3
c) 1 & 4
d) 1 & 5
e) 1 & 6

14. Clicker #4
What are the bond angles around the carbon and oxygen atoms in CH3OH?
Carbon
Oxygen a)
90
180 b)
107 c)
109.5 d)
104.5 e)
120