1. The problem statement, all variables and given/known data The activation energy and Arrhenius paramter can be found from its temperature dependence the Arrhenius equation k=Aexp(-Ea/RT) --> lnk=lnA - Ea/RT Given data is 5 temperatures with their corresponding k values Q1) From this data calculate A and Ea q2) Here A has been considered independent of temperature. Show this is a good approximation by comparing ratios A(T2)/A(T1) and exp(-Ea/RT2)/exp(-Ea/RT1) (T1 300K T2 500K) (use collision theory expression for A) 3. The attempt at a solution Q1) Ok so this bit I think is fine. To find Ea and A I plotted lnk vs 1/T to get a straight line Ea = -k x R = slope of the line x 8.314 then A is exp(intercept) So I got both the values from the graph. Not sure about the second part though: Q2)can only find collision theory 'A' as d^2(8kbT/u)^1/2 So I don't really understand which equation I'm supposed to be using to find A at T1 and A at T2? Then for exp(-Ea/RT2)/exp(-Ea/RT1) I'm just using the Ea value I found from the graph, just changing the temperatures. I'm guessing the ratios are supposed to turn out to be similar Help much appreciated!