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Kinetics (AP) Flashcards

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7970304317differential rate lawsreveal the relationship between the concentration of reactants and the rate of the reaction0
7970304318integrated rate lawsreveals the relationship between concentration of reactants and time1
7970304319reaction ratethe change in concentration of a reactant or product per unit of time2
7970304320differential rate law equationrate=k[A]^m[B]^n3
7970304321rate of appearancechange in [product] ---------------------------------- change in time (t2-t1)4
7970304322rate of disappearancechange in [reactant] -------------------------------------- change in time(t2-t1) the rate at which one species disappears5
7970304323Determination of reaction orderExperimentally from the data6
7970304324zeroth order reactionsdoubling the concentration has no effect on the rate at which this reaction occurs7
7970304325first order reactiondoubling the concentration of that species doubles the rate of the reaction8
7970304326second order reactiondoubling the concentration of that species quadruples the reaction rate; half-life doubles9
7970304327how to find the overall rate of the reactiondetermine the sum of the exponents in the rate law10
7970304328factors affecting reaction rate-surface area -concentration of reactants -temperature -nature of reactants (ie. solutions, gases) -catalysts (absence or presence of)11
7970304330activated complexthe (temporary) structure created at the point of maximum energy along the reaction path; aka transition state12
7970304331exothermic reactionthe potential energy of the REACTANTS is greater than that of the products13
7970304332endothermic reactionthe potential energy of the PRODUCTS is greater than that of the reactants14
7970304333activation energyminimum energy required to start a reaction; energy at which successful collisions can occur15
7970304336delta Ethe energy lost or gained in a reaction (through work or heat or both)16
7970304337kinetic controlthermodynamically favored processes that don't occur at measurable rates because of the high amount of activation energy needed for the reaction to take place17
7970304338thermodynamically favouredspontaneous18
7970304339arrhenius equationk=A^-Ea/RT19
7970304340Rideal gas constant20
7970304341reaction mechanismsthe series of steps that sum to the overall reaction allows successful collisions to take place21
7970304342unimolecular reactionsreactions that happen in one step22
7970304343reaction intermediatea substance that is produced and then consumed during the overall reaction23
7970304344rate determining stepthe slowest elementary step in a reaction24
7970304345method of determining the rate lawOnly through experimentation25
7970304347termolecular reactionsthese reactions are very rare and they require the simultaneous collision of 3 particles with sufficient energy and the correct orientation26
7970304348catalystlowers the activation energy of a reaction; doesn't appear in the overall reaction27
7970304349acid-base catalysisthe catalyst of the reaction is an acid or a base28
7970304350surface catalysisincreases the number of collisions that have the correct orientation29
7970304351enzymebiological catalyst30
7970304353units for k in a zero order reactionM/s31
7970304354units for k in a first order reaction1/s32
7970304355units for k in a second order reaction1/Ms33
7970304356units for k in a third order reaction1/M^2ᐧs34
7970304357first order integrated rate lawln[A]=-kt + ln[A]o35
7970304358first order reaction graphsplotting ln[A]t vs. time for first order reactions produce a straight line with a negative slope36
7970304359half-lifethe time it takes for the concentration of a reactant to decrease by half37
7970304360half-life eqn (first order)ln 2/k38
79703043622nd order integrated rate law1/[A]=kt + 1/[A]o39
7970304363graph for second order reactionswhen plotting 1/[A]t vs. time, a straight line with a positive slope is produced40
7970304364What is the only factor that can affect the activation energy of a reaction?the addition of a catalyst41
79703043654 ways to speed up a reactionincrease temperature increase surface area increase concentration add a catalyst42
7970304367homogeneous catalysta substance that is consumed in one step of the reaction mechanism but is a product in a subsequent step43
7970304368heterogeneous catalysta catalyst that exists in a difference phase from that of reactants and products44
7970304369graph of zero orderplotting concentration vs. time producing a straight line and a negative slope45
7971079243spontaneous reactionthermodynamically favourable rxn (delta G is a negative value)46
7973160921molecularitynumber of molecules that participate as reactants in an elementary reaction47
7973163331bimolecular reactionreaction that involves the collision of two molecules48
7973198567adsorptionbinding of molecules to a surface (usually the first step in heterogeneous catalysis49
7973221135multistep mechanismconsists of a sequence of elementary steps50
7973233746decreasesreaction rate ___________ as Ea increases51
7973748077method of initial ratesallows for determination of k, and order of reactants52
7973752394order of a reactantthe exponent to which the [reactant] must be raised in the differential rate law53

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