FSU
CHM 1046 -
LECTURE NOTES
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CHM1046 LECTURE NOTES 13 6 Reaction Mechanisms A series of individual chemical steps by which an overall chemical reaction occurs Consider the reaction Ha 2ICl 2HCl I2 Mechanism Step 1 H2 ICl HI HCl Step 2 HI ICl HCl I2 the HI acts as an intermediate and will not be present in the overall reaction Overall reaction H2 2ICl 2HCl I2 Each step is called an elementary step The Rate Law is derived from the slow step slow step is also known as the rate determining step Look at figure 13 16 in the book the Energy diagram for a 2 step mechanism The number of transition states the number of reaction steps The step with the larger Ea is the slower step
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