11 Rate Laws & Mechanisms

11 Rate Laws & Mechanisms - Ozone reacts with ethylene...

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1 1 Ozone reacts with ethylene to produce formaldehyde. 2 O 3 (g) + 2 C 2 H 4 (g) 4 CH 2 O(g) + O 2 (g) The data in the table below show how the initial rate of the reaction varies with the concentrations of the reactants. Use the data to determine the order of the reaction with respect to ozone, x, and ethylene, y. Report the overall order, x + y. Rate = k [O 3 ] x [C 2 H 4 ] y A) 2 B) 3 C) 4 4.0 2.0 1.0 3.0 1.0 1.5 1.0 1.0 0.5 Initial Rate 10 -12 mol L -1 s -1 [C 2 H 4 ] 10 -8 mol L -1 [O 3 ] 10 -7 mol L -1 2 QRT Homework Chapter 13 33, 36, 45, 71, 75, 79 Bring your Foundations of Chemistry book for the next two classes. We will go through Activity 30.
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2 3 This rate law Rate = k [A] 2 [ B] [C] 3 does not require that 6 molecules collide simultaneously and react. Rather, the rate law is determined by the reaction mechanism . Six molecules colliding simultaneously and reacting is one mechanism consistent with this rate law, but such and event is very improbable. How many times have you seen six automobiles collide simultaneously at an intersection? 4 Reaction Mechanisms A reaction mechanism is a series of elementary reactions. Elementary reactions are either a unimolecular or a bimolecular reaction. Its very improbable for 3 or more molecules to collide simultaneously with enough energy and orientations favorable for reaction.
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5 Rate Law for a Unimolecular Elementary Reaction First order Occurs when one molecule dissociates or rearranges into a different structure. cis trans isomerization O 3 O 2 + O Rate = k [O 3 ] 6 Rate Law for a Bimolecular Elementary Reaction Second order Occurs when 2 particles (atoms or molecules), collide with each other and react. NO + O
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This note was uploaded on 06/29/2008 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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11 Rate Laws & Mechanisms - Ozone reacts with ethylene...

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