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, 9/6, 10 pm. It is open now.
1st Quiz due Sunday, 9/8 by 10 pm. It will open Friday, 9/6 at 5 pm.

3. For Today 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

4. For Tuesday Textbook Homework
Chapter 3: 63, 65, 112, 125, 126, 135, 140
The text homework is “two pages long” – OWL on page 1 and Discussion on page 2.

5. For Wednesday Textbook Homework Videos Chapter 3: Stoichiometry
Challenge Problem: Chapter 3 #128
Chapter 4: Solution Stoichiometry
Concentration and Dilution
Precipitation Reactions and Solubility Rules

6. Chemistry Learning Center
2021 Chemistry Annex
Chemistry TAs available from 9 am – 5pm Mondays – Fridays. Link to the schedule is on the website (Contact Information)
Chemistry 202 TAs in the CLC:
Tuesdays: 1-3pm: Bailey
Wednesdays: 11am-1pm: Alex
Thursdays: 3-5pm: Sydney

7. 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.

8. 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%)

9. Chemical Reaction

10. Clicker Question
Balance the following equation in standard form and determine the sum of the coefficients:
C2H5OH + O2 → CO2 + H2O
a) 4
b) 5
c) 8
d) 9
e) 10

11. 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?

12. Challenge Problem: Ch. 3