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quiz2_notes

# quiz2_notes - Notes on Quiz 2 Please have a look at the...

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Notes on Quiz 2 : Please have a look at the past quizzes. 1. You should be able to do problems involving the integrated rate law for 0th, 1st and 2nd order reac- tions: so review some of last week’s material. 2. Practice going from one form of the Arrhenius equation to another: k = Ae E a /RT ln k 2 k 1 = - E a R 1 T 2 - 1 T 1 ln k = ln A - E a R × 1 T 1 E a = - R ln k 2 /k 1 1 T 2 - 1 T 1 1 T 2 - 1 T 1 = - R ln( k 2 /k 1 ) E a 3. Does E a depend on T , on concentration? 4. What plot is used to test the validity of Arrhenius equation? How can you get the activation energy and frequency factor from the graph? 5. Qualitative reason for rate (and therefore rate constant) increasing with temperature: fraction of molecules with energy in excess of the certain value ( E a ) increases with temperature. Frequency factor does not change. 6. You should be able to draw energy profile diagrams for a given mechanism. Remember that fast reactions have low activation energy and vice versa. If information is given about the enthalpy of reaction for a step, this should be shown in the diagram.

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quiz2_notes - Notes on Quiz 2 Please have a look at the...

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