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Week 04 - Instructor

Week 04 - Instructor - General Chemistry II General CHEM...

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General Chemistry II General Chemistry II CHEM 152 CHEM 152 Week 4
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UA GenChem Week 4 Reading Assignment Chapter 13 – Section 13.6 (mechanisms)
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UA GenChem Reaction Reaction Mechanisms A Microscopic View of Reactions A Microscopic View of Reactions Mechanism: how reactants are converted to Mechanism: how reactants are converted to products at the molecular level. products at the molecular level. RATE LAW RATE LAW MECHANISM MECHANISM experiment experiment theory theory
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UA GenChem Isomerization Simulation Mechanism and Order A(blue) B(red) An isomerization reaction occurs in a single step (mechanism) . This is a unimolecular process. What is theorder of this reaction?
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UA GenChem What is the overall reaction order? 1. 1 2. 2 3. 0
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UA GenChem Reaction Mechanisms UNIMOLECULAR UNIMOLECULAR : thestructureof a singleparticle : thestructureof a singleparticle rearranges to produce a different particleor particles. rearranges to produce a different particleor particles. Isomerization Isomerization Reaction Order? Rate= K[A] 1 st -Order
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UA GenChem UNIMOLECULAR process UNIMOLECULAR process Conversion of trans to cis butene Conversion of trans to cis butene Activation energy barrier ONE molecule changing
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UA GenChem Dimerization simulation This is a “bimolecular” process. Mechanism and Order What is the order of the reaction?
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UA GenChem What is the overall reaction order? 1. 1 2. 2 3. 0 4. WTF?
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UA GenChem Reaction Mechanisms BIMOLECULAR: Two particles collide and rearrange into products Reaction Order? RATE= K[A][B] 2 nd Order
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UA GenChem Elementary Step Molecularity RateLaw A product 2A product A + B product 2A + B product Unimolecular Bimolecular Bimolecular Termolecular Rate = k [A] Rate = k [A] 2 Rate = k [A][B] Rate = k [A] 2 [B] RateLaws for General Elementary Steps
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UA GenChem Gummy Bear “Terminator” 8 KClO 3 8 KCl + 12 O 2 C 12 H 22 O 11 + 12 O 2 12 CO 2 + 11 H 2 O Step #1 Step #2 C 12 H 22 O 11 + 8 KClO 3 8 KCl + 12 CO 2 + 11 H 2 O Rate 1 = k 1 [KClO 3 ] 8 Rate 2 = k 2 [C 12 H 22 O 11 ][O 2 ] 12
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UA GenChem PLAN: Determining Molecularity and RateLaws for Elementary Steps
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