1. As always… OWL Lon-Capa assignments Lecture videos Textbook Read
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2. VSEPR – General Guidelines
Draw the Lewis structure.
If the octet rule is exceeded, add electrons to the central atom.
Multiple bonds count as one direction (or one “effective pair”).
Consider the lone pairs when determining the geometry.
Consider only the atoms when determining the shape.
Polarity comes from asymmetry.

3. VSEPR Model

5. Clicker Question
How many of the following molecules can correctly be described as “bent”?
O3 H2S SeO2 CO2 XeCl2
a) 1
b) 2
c) 3
d) 4
e) 5

6. Chapter 13: #122

7. Clicker Question
Which of the following correctly labels the molecules as polar or non-polar?
SO2 BH3 CO2
a) polar polar polar
b) non-polar non-polar non-polar
c) polar non-polar polar
d) polar non-polar non-polar
e) non-polar polar polar

8. Intermolecular Forces (IMFs)

9. Clicker Question
Methane (CH4) is a gas, but carbon tetrachloride (CCl4) is a liquid at room conditions. Which of the following explains this phenomenon?
a) CCl4 is a polar molecule and CH4 is not.
b) CCl4 and CH4 have different geometries and shapes.
c) CH4 exhibits hydrogen bonding and CCl4 does not.
d) Cl is more electronegative than H.
e) None of the above explanations explains this.