09 - 12/1/09 Chapter 15: Kinetics- Rates of Chemical...

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12/1/09 Chapter 15: Kinetics- Rates of Chemical Reactions -Notion of activation barrier -Molecules react by undergoing collision. These collisions impart energy; if there is enough energy to result in a reaction, the process goes forward -That notion conforms to our experience regarding what makes reactions go: 1) Concentration : If reactions occur when molecules collide, then the rate of reaction should be proportional to the frequency of collisions. The higher the density of particles, the higher the collision frequency -Physical State : For collisions to occur, molecules must be free to move about. SO finely divided solids or liquids should be more reactive than large solid objects. 2) Temperature . Has two effects on reaction rates. First, increasing temperature will increase the velocity of molecules (KE= ½ mv 2 ) which in turn, increases the frequency of collisions -More importantly, it increases the energy of collisions. Most molecular collisions are like billiard ball collisions. Molecules simply collide and bounce off without undergoing
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09 - 12/1/09 Chapter 15: Kinetics- Rates of Chemical...

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