_Reactions occur because of collisions, but just because molecules collide, that doesn't mean there will be a reaction.  The powerpoint lesson is on the unit 3 page as "collision theory".  Note the summaries of these concepts on p.385, 396.
Homework:  Read p.392-396 and make brief notes; answer p.396 #1, 3, 4; p.408 #10

The unit test will be next Tuesday, Nov.22.  Review questions include:  p.412 #1-2, 7, 9-22, 26, 28-30; p.414 #3, 5-8, 10, 16, 18, 20, 26



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