1. Announcements Pre-lab due this week at the start of lab! Electronic HW #6 Type 1 due Monday, Nov. 18 th at 7:00pm Electronic HW #6 Type 2 due Wednesday, Nov. 20 th at 7:00pm

2. Comparison of Exam Scores Exam I Score Exam II Score

3. Clicker #1 Which is lower in potential energy and more stable? unburned match or burned match A) unburned match B) burned match

4. Exothermic: more energy leaves the system overall Endothermic: more energy goes into the system overall 2H 2 + O 2  2H 2 O2H 2 O  2H 2 + O 2

5. Example #1 Is the freezing of water an endothermic or exothermic process? (The system is underlined.) Exothermic

6. Clicker #2 Is the boiling of water an endothermic or exothermic process? (The system is underlined.) A)endothermic B)exothermic

7. Example #2 Is an activated cold pack an endothermic or exothermic process? (The system is underlined.) Endothermic

8. Clicker #3 Is an activated hot pack an endothermic or exothermic process? (The system is underlined.) A)endothermic B)exothermic

9. Clicker #4 Is a racquetball frozen by liquid nitrogen an endothermic or exothermic process? (The system is underlined.) A)endothermic B)exothermic

10. Example #3 Is the thermite reaction (the chemical reaction) an endothermic or exothermic process? (The system is underlined.) Exothermic Fe 2 O 3 (s) + 2 Al (s)  2 Fe (l) + Al 2 O 3(s)

11. Overall goal: Atomic StructureChemical Bonding3D Molecular StructureMolecular Properties

12. Reading homework for Thursday Review the various atomic models in your textbook (Sections 4.3, 4.5) Read about electromagnetic radiation (Sections 11.1-11.3) http://www.chem.illinois.edu/clcwebsite/cathode.html J.J. Thompson’s discovery: Rutherford’s experiment: http://www.youtube.com/watch?v=5pZj0u_XMbc