1. Warm up (Sept 27) Lab 3 on desk all done, please!
Homework Packet also out, please!
AP Practice Problem on your own with equations sheets:
This would be a 10 minute-long problem (from a recent exam!)
# practice exam – ionization energy and light – great question

2. Waves – a recap c = νλ E = hν Why does this equation make sense?
What else is it useful for?

3. Bond breaking energy
The bond strength of Cl2 is 242 kJ/mol. Find the wavelength of energy needed to break one Cl-Cl bond.
What do we need to do??? Many steps!
4.94 x m (or mm)

4. Cool Article!
/03/ htm

5. Solution Stoichiometry!
How much M HCl would you need to add to 3.15 grams of Zinc to react it fully?
Start with a balanced equation!
664 mL

6. Practice Problem – solution stoich!
45.0 mL of M iron (III) acetate is mixed with mL of M sodium hydroxide.
Write the balanced chemical equation and the net ionic equation
What is the theoretical yield of the reaction?
If the percent yield is 120%, what was the actual (experimental yield)?
Can you name a realistic source of error?
Theoretical = 1.37 g Fe(OH)3
Actual = 1.65 g
Source of error = too many spectator ions not rinsed out, rust, still wet

7. Lab 4 – Synthesis of Alum Putting a lot of Unit 1 into practice!
Molarity
Stoich
Hydrates
A couple of new techniques!!
Crystallization
Filtration using a buchner funnel – you’ll love it!
Melting point test for purity? (If time)
VERY DANGEROUS – aprons and gloves today ALL DAY (after school)

8. What is ALUM? Potassium Aluminum Sulfate Hydrate salt
You’ll be finding the hydrate number next week

9. NOW: Pre-lab 4 so we are ready to start after school on time!
Purpose, data table, and lots of room for observations needed (three days of lab!)
Pre-lab qs before you can start today!
Groups: Keegan/Solhee, Mario/Luca/Gioia, Benedetta/Zefan, Thomas/Federico, Austin/Allan, Meher/William, Mattia/Alvaro

10. Homework Day 9
Zumdahl Homework (Webassign still isn’t figured out, so it’ll be paper this time)
Chapter 4: 38, 39, 42, 44, 56, 58
We should be comfortable with (check that you feel that way!)
Unit 1 Test Next week Thursday!