lec04_02162007_g - 10.37 Chemical and Biological Reaction...

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Chemical and Biological Reaction Engineering, Spring 2007 Prof. William H. Green Lecture 4: Reaction Mechanisms and Rate Laws Fundamentals of Chemical Reactions -PSSA (SS, QSSA, PSSH) -long chain approximation -rate-limiting step A+B Stable molecules: neutral, closed shells (-) (e-) (+) nucleus nucleus bond Figure 1. Stable molecules. Pauli Exclusion Principle -You can’t put 2 identical e- in the same exact spot Figure 2. Two electrons in an orbital have opposite spin. Bond Forming H + + 0 e- 2 e- empty orbital H H H Figure 3. Bond formation. On the left, an empty orbital receives two electrons from another orbital. On the right, half-filled orbitals on the H atom mix to form a filled bonding orbital with two electrons. Cite as: William Green, Jr., course materials for 10.37 Chemical and Biological Reaction Engineering, Spring 2007. MIT OpenCourseWare (http://ocw.mit.edu), Massachusetts Institute of Technology. Downloaded
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lec04_02162007_g - 10.37 Chemical and Biological Reaction...

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