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study-note-4-45 - Rates of reaction 18.1-18.2 Define...

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Rates of reaction 18.1-18.2 Define “mechanism” of reaction. The series of individual steps leading to the overall reaction. Why would we expect that the burning of propane does not occur in a single step? The chemical equation for burning propane is: C 3 H 8 (g) + 5O 2 (g) 3CO 2 (g) + 4H 2 O(g). In order for the reaction to occur in a single step, five oxygen atoms would have to, simultaneously, come in contact with a propane molecule. This would be too rare an occurrence to explain the rapid chemical reaction observed when propane is burned. What five factors influence reaction rates? 1) Chemical nature of reactants, 2) ability of reactants to make contact, 3) concentrations, 4) temperature, 5) presence of catalysts. How is the nature of reactants important? Some chemicals have a tendency to react more than other chemicals. For example, sodium combines rapidly with O 2 , whereas iron does not. What influences the ability of reactants to meet?
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