12 & 13 FoC Activation Energy & Catalysts

12 & 13 FoC Activation Energy & Catalysts - This...

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1 1 This reaction occurs between nitrogen dioxide and fluorine. 2NO 2 + F 2 2FNO 2 The following mechanism is proposed. (1) NO 2 + F 2 FNO 2 + F (fast equilibrium) (2) NO 2 + F FNO 2 (slow) What is the rate law predicted by this mechanism? A) Rate = k [NO 2 ] [F 2 ] B) Rate = k [NO 2 ] 2 F 2 ] C) Rate = k [NO 2 ] 2 [F 2 ] [FNO 2 ] -1 2 (1) NO 2 + F 2 FNO 2 + F (fast) (2) NO 2 + F FNO 2 (slow) Rate(2) = k 2 [NO 2 ] [F] Equilibrium(1): k 1 [NO 2 ] [F 2 ] = k -1 [FNO 2 ] [F] [F] = (k 1 /k -1 )([NO 2 ] [F 2 ] / [FNO 2 ]) Rate = Rate(2) = k ([NO 2 ] 2 [F 2 ] / [FNO 2 ]) A) Rate = k [NO 2 ] [F 2 ] B) Rate = k [NO 2 ] 2 F 2 ] C) Rate = k [NO 2 ] 2 [F 2 ] [FNO 2 ] -1 FNO 2 inhibits the reaction because it lowers the concentration of F.
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2 3 Homework for Friday, Feb. 20, and Monday, Feb. 25. Review these lecture notes, and answer the questions in the notes. Complete “Foundations of Chemistry” Activity #30 (3 rd edition). Chapter 13: QRT 51, 53, 81, 89 POGIL-IC Problem See Blackboard / Assignments “Time of Death: When Did It Happen” Complete this activity by Wednesday 3AM 4 What you need to do for the POGIL-IC problem: Report your solution to the problem in the “Time of Death” Survey on BB. (Hours since death.) Respond to the other questions in the survey to help us develop more interesting and effective activities. LUCID quiz includes the 2 “Got It?” questions.
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3 5 POGIL - IC Process-Oriented Guided-Inquiry Learning – In Context National Science Foundation Project Develop activities to help students improve their problem-solving skills. Research – Based Design Really challenging problems. Work together in teams. Supported by an expert methodology. Three levels of help: Au, Ag, and Cu 6 Design of POGIL-IC Activities. Prerequisites Learning Outcomes The Problem Solve the Problem Does Your Answer Make Sense? Building Your Problem Solving Skills Got It? (2 questions) Au, Ag, and Cu Help
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4 7 The remainder of this lecture follows Foundations of Chemistry Activity #30, pp. 207 - 214 (3 rd Edition) Which you should have completed already because it was assigned as homework on Friday. 8 Activation Energy Both reactants and products are stable. Interconversion of reactants and products is prevented by an energy barrier. The activation energy is the height of the energy barrier between reactants and products. Energy is required to go over this barrier. Whether the reaction is exothermic or endothermic depends on H for reactants going to products. Not on the activation energy.
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5 9 Energy Diagram for a Substitution Reaction I - + CH 3 Br CH 3 I + Br - Energy = Gibbs Free Energy when P is constant and there is only PV work 10 Model 1: Reaction Energy Diagrams KQ 1. Is the change in enthalpy for the reaction >0 or <0? Is the reaction endothermic or exothermic?
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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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12 &amp; 13 FoC Activation Energy &amp; Catalysts - This...

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