Chemistry 1302A/B Lecture Notes - Lecture 17: Rate-Determining Step, Reaction Step, Arrhenius Equation

• School: Western University
• Department: Chemistry
• Course: Chemistry 1302A/B
• Professor: Felix Lee

Document Summary

To find ea from a catalyst ln(ratecatalysed / rateuncatalysed) = ln (kcatalysed / kuncatalysed ) = ea (uncat) - ea (cat) = ea. When we"re given some values we"re often asked to find the factor. If the catalyst lowers our activation energy, it often speeds it up by 1000000 times. Elementary step = "fundamental steps that see exactly what"s happening in between" We generate products that are not seen in the final that are produced, but used up! Number of species reacting in an elementray step (not the overal, the elementary step) Unimolecular = one species (must be first order in terms of rate) Bimolecular = two species (second-order reaction in terms of rate) A + a -> products rate = k[a]2. A + b -> products rate = k[a][b] Recall with elementary steps that the coefficients refer to the exponents. Not the overall reaction, but only in elementary studd like this.