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 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 Tomorrow Textbook Homework
Chapter 3: 112, 135
The text homework is “two pages long” – OWL on page 1 and Discussion on page 2.

5. 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

6. Required Materials
Textbook: Chemical Principles, 8th Ed., Zumdahl & DeCoste, OWL
Calculator: Hand-held; no internet connectivity.
i-Clicker: For use during lectures

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

8. 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

9. 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.

10. Owl #2/Textbook Problem #44
Arrange the following substances in order of increasing mass percent of carbon.
a. caffeine, C8H10N4O2
b. sucrose, C12H22O11
c. ethanol, C2H5OH

11. Owl #1/Textbook Problem #37
Consider the following gas samples: 4.0 g hydrogen gas, 4.0 g helium gas, 1.0 mole of fluorine gas, 44.0 g of carbon dioxide gas, and 146 g of sulfur hexafluoride gas.
Arrange the gas samples in order of increasing number of total atoms present.

12. Owl #7/Textbook Problem #98
Many cereals are made with high moisture content so that the cereal can be formed into various shapes before it is dried. A cereal product containing 58% H2O by mass is produced at the rate of kg/h. How much water must be evaporated per hour if the final product contains only 20.% water?

13. 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.