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 10-19 J? About 576 nm

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

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

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

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 10 -5 m (or 0.0494 mm) http://www.chemhume.co.uk/ASCHEM/Unit%201/Ch3Chemstr/Images%203/covalent_bonding_cl2.jpg

Cool Article! https://www.sciencedaily.com/releases/2017 /03/170313135050.htm

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!

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

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)

Aluminum – compare to your orbital diagram from last class!

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

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

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

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