CHEM 112 Lecture Notes - Lecture 4: Rate Equation, Reaction Mechanism, Reaction Rate
Document Summary
Today: experimental rate laws, reaction mechanisms and rate-determining step, determine rate law from proposed mechanism. Reminder: hw1 is due @11:55 pm edt wednesday 1/27, knowledge check quiz 1 on thursday 1/28: opens @ 12 am edt and closes at 11:55 pm edt. 8 questions total, the last question asks you to practice uploading/embedding work in canvas quiz. For a general reaction: a a + b b c c + d d. The rate law can be written as: rate = k [a]x[b]y. 3 unknowns: k, x, and y, need to do at least 3 experiments. Method of initial rates : start with initial [a]0 and [b]0, measure rate, keep [b]0 constant, while change [a]0, measure rate, keep [a]0 constant, while change [b]0, measure rate. Once x and y are determined, use one set of experimental data to determine the value and units of k. Example: the following data were collected for the rate of disappearance of o2 in the reaction:
