1. Creating a Positive Learning Environment for Everyone
Be respectful of your classmates
Save conversation for clicker portions of lecture
Put cell phones in “airplane” mode
Turn off tablets
Close laptops

2. Announcements
Exam #3: Thursday, Dec. 7th, 7:00-8:30pm (Conflict: 5:00-6:30pm, sign up in 1026 Chem Annex)
No calculators allowed
Conflicts to conflicts? Must TELL me by TOMORROW!
Q & A Review Sessions will be posted soon
Activity 3: Making Models of Molecules lab write-up due tomorrow in discussion
Lon-capa HW Remaining
Homework 7 – Type 1 due Monday, 12/4 by 7pm
Homework 8 – Type 1 due Wednesday, 12/6 by 7pm
Review Questions for Exam III due Wed, 12/6 by 10pm
Prelecture Assignments

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

4. Clicker #1
Which of the following Lewis structures is correct for CO2 (following the octet rule)? A) B) C)
D) All of the structures are correct and are considered
to be resonance structures.
E) Only two (a and c) of the structures are correct.

5. Clicker #2
Which of the following supports why Lewis structures are not a completely accurate way to draw molecules?
A) The Lewis structure for O2 shows all electrons as paired but when liquid O2 is poured onto a magnet, it behaves as a molecule with an unpaired electron.
B) There are sometimes multiple valid Lewis structures for a single chemical species.
C) When adding up the number of valence electrons for a molecule (such as nitrogen monoxide), it is possible to get an odd number which would make it impossible to satisfy the octet rule for all atoms.
D) All of the above statements support why Lewis structures are not a completely accurate way to draw molecules.
E) Lewis structures are the most accurate way to draw molecules and are completely correct.

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

9. BF3
SO2
CCl4
NF3

10. Clicker #3
Does CCl4 have an overall net dipole moment (is it polar overall)?
A) Yes, the electrons are found more towards chlorine.
B) Yes, the electrons are found more towards the carbon.
C) No, the electron distribution is symmetrical around the central atom.

11. SF4

12. Clicker #4
Does H2O have an overall net dipole moment (is it polar overall)?
A) Yes, the electrons are found more towards oxygen.
B) Yes, the electrons are found more towards the hydrogens.
C) No, the electron distribution is symmetrical around the central atom.

13. Clicker #5
Does PCl5 have an overall net dipole moment (is it polar overall)?
A) Yes, the electrons are found more towards phosphorus.
B) Yes, the electrons are found more towards the chlorines.
C) No, the electron distribution is symmetrical around the central atom.

14. Clicker #6
Does IBr2– have an overall net dipole moment (is it polar overall)?
A) Yes, the electrons are found more towards the central iodine atom.
B) Yes, the electrons are found more towards the outer bromine atoms.
C) No, the electron distribution is symmetrical around the central atom.

15. Clicker #7
Does XeCl4 have an overall net dipole moment (is it polar overall)?
A) Yes, the electrons are found more towards xenon.
B) Yes, the electrons are found more towards the chlorines.
C) No, the electron distribution is symmetrical around the central atom.