CHE-1102 Lecture Notes - Lecture 16: Reaction Rate, Chemical Kinetics, Negative Number
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Average rates: reactants disappear and products appear (a b, the average rate of disappearance of a is: [a] is the change in concentration of b, usually in molarity. Example: if reactant a decreased from 0. 900 m to 0. 300 m in 40 seconds, what is the average rate of disappearance. [b] is the change in concentration of b, usually in molarity negative the same way that speed cannot be negative. The negative sign in the front of the equation, cancels out the negative number: the average rate of appearance of b is: we get when we subtract 0. 300 and 0. 900. Average rate= change in [b] change in time change in time= change in [b] rate= change in [a] change in time. =0. 012 m/s: relative reaction rates are average rates, but they take stoichiometry into what is the average rate of disappearance. consideration.