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,

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Presentation transcript:

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

Comparison of Exam Scores Exam I Score Exam II Score

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

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

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

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

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

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

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

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)

Overall goal: Atomic StructureChemical Bonding3D Molecular StructureMolecular Properties

Reading homework for Thursday Review the various atomic models in your textbook (Sections 4.3, 4.5) Read about electromagnetic radiation (Sections ) J.J. Thompson’s discovery: Rutherford’s experiment: