Chapter%2012_Rates%20and%20Equilibrium_post(1)

Chapter%2012_Rates%20and%20Equilibrium_post(1) - CHM 11200...

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CHM 11200 Spring 10 Chapter 12 Reaction Rates and Equilibrium
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Reaction Rates Some chemical reactions occur very quickly while others may take years. Rate of a reaction is a measure of how fast the reaction occurs. 2
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Reaction Rates 3 Reaction rate depends on the conditions of the reaction: concentrations temperature surface area presence of a catalyst
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Collision Theory 4 Let’s try to explain how reaction rates vary by thinking on a molecular level. Collision theory says that for a reaction to occur, the reactant molecules must collide with sufficient energy and in the proper orientation. Let’s consider the following reaction that occurs in smog: O 3 (g) + NO (g) O 2 (g) + NO 2 (g)
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Orientation of Collisions 5 O 3 (g) + NO (g) O 2 (g) + NO 2 (g) Which collision will result in reaction?
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Energy of Collision 6 If the O 3 and NO molecules have that orientation, will the reaction automatically take place?
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Energy Needed for Reaction 7 Molecules must collide with sufficient energy for a reaction to occur because reactions involve breaking of bonds (which requires energy).
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Conditions Affecting Reaction Rates 8
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This note was uploaded on 02/27/2012 for the course CHEM 112 taught by Professor Harwood during the Spring '11 term at Purdue.

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Chapter%2012_Rates%20and%20Equilibrium_post(1) - CHM 11200...

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