1. Chemistry 101 Dr. Don DeCoste 3014 Chemistry Annex
2-3 pm Mondays and am Thursdays
By appointment
Open door policy

2. To Do… Chapter 8 this week. Lab tomorrow: Activity 1 on measurement.
Lab safety quiz on Lon-Capa
OWL (Wednesday and Friday)

3. Figure 5.1

4. Clicker Question How many of the following is/are named incorrectly?
I. PCl3 phosphorus(III) chloride
II. KCl potassium monochloride
III. CoO cobalt oxide
IV. Fe2O3 iron(II) trioxide
a) b) c) d) e) 4

5. Clicker Question I. PCl3 phosphorus trichloride
phosphorus(III) chloride
II. KCl potassium chloride
potassium monochloride
III. CoO cobalt(II) oxide
cobalt oxide
IV. Fe2O3 iron(III) oxide
iron(II) trioxide

7. Subscripts Represent Numbers

8. The Mole Concept: Why? We can count by weighing (relative masses).
Reactions occur by number of particles, we must deal with masses, so we must have a way of converting between number and mass.
Subscripts in formulas represent numbers.
Atoms/molecules are very small!