1. Chemistry 202 Dr. Don DeCoste 3014 Chemistry Annex
11am-12pm Mondays and Wednesdays (after lecture)
10-11 am Tuesdays and 1-2 pm Thursdays
By appointment; open door policy

2. Lon-Capa 1st HW assignment due Friday, 9/7, 10 pm. It is open now.
1st Quiz due Sunday, 9/9 by 10 pm. It will open Friday, 9/7 at 5 pm.

3. For Today OWL Textbook Homework Videos Introductory Material
Chapter 3: 37, 44, 47, 59, 61, 94, 98
Videos
Introductory Material
Chapter 3: Stoichiometry
Stoichiometry I: Mass to Mass Conversions
Stoichiometry II: Limiting Reactants

4. For Friday OWL Textbook Homework Videos Chapter 3: Stoichiometry
Videos
Chapter 3: Stoichiometry
Problem Solving in Stoichiometry I: The Set-Up
Problem Solving in Stoichiometry II: Method 1
Problem Solving in Stoichiometry III: Method 2
Problem Solving in Stoichiometry IV: Method 3

5. Clicker Question Which best describes your current status?
a) Freshman (1st year)
b) Sophomore
c) Junior
d) Senior
e) 5th-year senior

6. Clicker Question Which best describes your major? a) Chemistry
b) Chemical Engineering
c) Biology or Life Science (MCB, IB, Biochemistry)
d) Engineering (not Chemical)
e) Other

7. Problem Solving: A Journey
Where Are We Going?: What are we trying to solve? What does this mean?
Where Have We Been?: What do we know? What is given in the problem, and what is our knowledge base?
How Do We Get There?: How do we connect what we know to what we are trying to solve? Diagrams and more questions can be useful.

8. Clicker Question
A metal ion has 23 electrons in an ionic compound that is about 30% oxygen by mass. Which metal is in the oxide?
a) Vanadium
b) Chromium
c) Manganese
d) Iron
e) I am not sure how to do this.

9. Make Sure You Understand This…
Determine the percent mass of oxygen in each of the following substances
H2O (water) (88.81%)
H2O2 (hydrogen peroxide) (94.07%)