3.5 Chapter 14 Chemical Kinetics (inked 3)

3.5 Chapter 14 Chemical Kinetics (inked 3) - Transition...

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Transition State 14-10 Reaction Mechanisms • A step-by-step description of a chemical reaction. • Each step is called an elementary process . – Any molecular event that significantly alters a molecules energy or geometry, or produces a new molecule. • Reaction mechanism must be consistent with: – Stoichiometry for the overall reaction. – The experimentally determined rate law. Elementary Processes • Unimolecular or bimolecular . • Exponents for concentration terms are the same as the stoichiometric factors for the elementary process. • Elementary processes are reversible . • Intermediates are produced in one elementary process and consumed in another. • One elementary step – if much slower than all the others – is known as the rate determining step . Slow Step Followed by a Fast Step H 2 (g) + 2 ICl(g) I 2 (g) + 2 HCl(g) d t = k [H 2 ][ICl] d[ P ] Postulate a mechanism: H 2 (g) + 2 ICl(g) I 2 (g) + 2 HCl(g) slow H 2 (g) + ICl(g) HI(g) + HCl(g) fast HI(g) + ICl(g)
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3.5 Chapter 14 Chemical Kinetics (inked 3) - Transition...

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