1. Warm-up (Sept 28) Homework out, please!
What is the wavelength (in nm) of an electronic transition in Neon with an energy of 3.45 x J?
About 576 nm

2. Multiple Choice! A) 3  2 B) 4  3 C) 3  ∞ D) 3  1
Which of the following transitions in the Hydrogen atom would give a wavelength in the IR (infrared) region of the spectrum?
A) 3  2
B) 4  3
C) 3  ∞
D) 3  1 B

3. Summer Homework Back (keep it forever – we’ll reference it often)
Let’s grade chapter 2 questions (we’ll save the others as we are reviewing chapters 1, 3, and 4)
Numbers 2, 6, and 8

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

5. 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)

6. Cool Article!
/03/ htm

7. NOW: Split! Andrea and Laura with me (front row)
12.1
Lab A – Analysis of the Lyman series
The rest of you - in the back to work on:
Lab 1 Report Due Tomorrow
MAKE IT AWESOME! Use your time wisely
Look over Homework Key for SL Homework – work through and see what questions you have
Study for Quiz on Chapter 2 Monday in class!
The whole key to every practice question is your SL Key for Homework – do any extras we didn’t do!

8. Look Over Homework Keys
SL and HL different – find on Moodle and look through

9. 12.1 – Supplementary info! What evidence does the Bohr model give us?
What evidence do we have that Bohr’s model is incomplete?
Energy levels and quantum jumps
Did not work for anything else than H, (ionization energy and davisson-germer/debroglie test for waves helped debunk)

10. Aluminum – compare to your orbital diagram from last class!

11. Practice
This is evidence that our orbital diagrams are accurate – sublevels, etc

12. Why non-linear?
Evidence for singly filled (Pauli) orbitals, etc

13. Lab A (HL) – Finding Ionization Energy in Hydrogen using Lyman Series
Take a look at pg 86-87

14. Homework Day 9
Lab 1 Formal Write-up due TOMORROW shared with me on Google
Quiz Monday on chapter 2!
HL – Lab A by Wednesday