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chem exam 2 kinetics

QuestionAnswer
[] brackets represent molarity
reaction rate is change in concentration (of a reactant) per unit time a positive , time dependent (in general) quantity
unit of rate mol/Ls aka mol L^-1 s^-1
average rate concentration change over a finite time interval rate of change OVER A TIME INTERVAL ex: amount of distance in a time, the average speed
instantaneous rate rate of change at one moment of time concentration change over an infinitesimal interval ex:the speed @ any given moment
rate constant k it does NOT depend upon the concentrations of the reactants (does depend on temp but not conc.) proportionality factor (shows that rate is proportional to concentration of ___)
reaction order used to characterize rate laws the power to which the concentration of the reactants are taken phrased like: “Reaction is mth order with respect to [A] (concentration A)”
is the reaction order the same as/related to stoichiometric coefficients? NO
overall reaction order sum of the exponents themselves m + n + p “The reaction is __th order overall”
how are rate laws determined experimentally have to take experimental data to reduce cannot be deduced stoichiometrically
rates are always positive
reactants have what sign in front of their rate law before solving it negative you get less of it multiple by -1 to get it positive
products have what sign in front of their rate laws before solving positive you get more of it
are rates consistent throughout no rate changes at different times; not 100% consistent we can use instantaneous rate eqn to find these
generic rate law rate=k[A]^m[B]^n [C]^p
arrheinus factor e^(-Ea/RT) the fraction, out of allmolecules, of the ones that have enough kinetic energy to overcome activation energy “represents frac of molecules with KE greater than Ea at a given temperature” shows dependance of k on T
Created by: user-1759191
 

 



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