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. OWL
Textbook homework
OWL
Chapter 5 due Friday (1/26) by 10 pm.
Chapter 8 due Tuesday (1/30) by 10 pm.
Lab write-up due in Discussion tomorrow.

3. Clicker Question
You have a 10.0 g sample of copper (Cu). What mass of magnesium (Mg) do you need to have the same number of Mg atoms as Cu atoms?
a) More than 10.0 g of Mg.
b) Less than 10.0 g of Mg.
c) 10.0 g of Mg.
d) I have no idea.

4. Calculate… You have a 10.0 g sample of copper (Cu).
Determine the mass of magnesium (Mg) such that the number of copper atoms and magnesium atoms are equal.

5. 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?

6. Consider This…
Does a methane molecule (CH4) contain more hydrogen or more carbon?

7. Calculate…
Determine the percent mass of oxygen in each of the following substances:
H2O (water)
H2O2 (hydrogen peroxide)

8. Calculate…
You have g samples of each of the following compounds:
Sulfuric acid: H2SO4
Sucrose (table sugar): C12H22O11
Potassium chlorate: KClO3
Which one has the greatest number of oxygen atoms?