1. Creating a Positive Learning Environment for Everyone
Be respectful of your classmates
Save conversation for clicker portions of lecture
Put cell phones in “airplane” mode
Turn off tablets
Close laptops

2. Announcements
Textbook homework and lab write-up due tomorrow in discussion
Electronic HW #2 (Lon-Capa)
Type 1 due Monday, 9/11, 7:00pm
Type 2 due Wednesday, 9/13, 7:00pm
Prelecture Assignments
Lab write-ups must be your own.
What to memorize for exam.

3. By the Exam… Know the polyatomic ions and charges (Table 5.4).
Know common ions and symbols (Tables 5.1 and 5.2). The charges for these come from the periodic table.
Know prefixes (Table 5.3).

4. Clicker #1 What is the average mass of one hydrogen atom? A) 1.008 amu
B) g
C) moles
D) Both A and B are correct.

5. Clicker #2 How do these two numbers compare?
A) # of H atoms are less than the # of C atoms
B) # of H atoms are equal to the # of C atoms
C) # of H atoms are greater than the # of C atoms
D) I have no clue. Help!

6. Clicker #3 Which sample contains a greater number of atoms?
10.0 g Cu or 10.0 g Mg
A) 10.0 g Cu
B) 10.0 g Mg

7. Clicker #4 Which sample contains a greater number of atoms?
10.0 g Cu or 5.00 g Mg
A) 10.0 g Cu
B) 5.00 g Mg

8. Additional Question
What is the number of atoms of hydrogen in g magnesium hydroxide?

9. Closing Joke
What do you have when you see a mole of moles digging a mole of holes?
A bunch of molasses