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ch#13.4-13.9, ch#14, ch#15

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.

chemical kinetics   is the study of how fast chemical reactions occur  
reaction rate   aA + bB ---->cC + dDreactants are (-) and products are (+)  
what does the reaction depend on   it depends on the amount of reactants that are present  
method of initial rate   you measure the rate at the beginning of the reaction; after mixing the reactants, and assume that the reactant concentrations does not change enough to change the reaction rate  
instateneous rate   is the rate of a reaction changes as it poceeds it decreases. as the reactants are used up. this tells us that the rate of the reaction in general depends on the cencentration of the reactants and this gives us the rate law.  
units for rate   mol/liter sec or mol/liter min  
rate constant   takes whatever units it must in order for the rate units to be correct, and this depends on the order of the reaction  
integrated rate laws   expresses the time dependence of reactant concentrations. need reactant concentration as a function of time  
first order reaction   rate = k[A]  
half life   is the amount of time it takes from the [A] = 1/2 [A]o  
example   isomerization of cis-2-Butene  
explain the series of reaction called mechanism   it must be simple. an overall reaction can be an elementary reaction, but more commonly, an overall reaction consists of series of elementary reactions that had form reactants to products. this series of reaction is called the mechanism  
how do you determine validity of a mechanism   knowing the rate law  
3 types of elementary reaction   unimolecular, bimolecular, trimolecular  
unimolecular   only 1 molecule by itself react. simple, ex isomerization of cis-2-butene,and it reacts with 1st order rate laws. rate = k[A]  
bimolecular   2 molecules (or atoms or ions) react with each other, reactions must have 2nd order rate laws. rate = k [I] [CH3Br]  
trimolecular   3 molecules (atoms or ions) react with each other. ex have 3rd order rate law, but these are very rare (3 things collide)  
intermediate   is an species produced in one step of a mechanism and consumed on a later step  
catalyst   is a substance that increases the rate of reaction without being consumed  
what is an elementary reaction   is a sone step precess whose equaation describes which nanoscale particles break apart, rearrange their positions, or collide to make a reaction occur.  
equilibrium is   the rate of the forward reaction is equal to the rate of the backward reaction  
forward rate is   cis (f)  
backward rate is   k(b) trans  
k (c)   equilibrium constant and is a function of temperature only  
k (c) is equal to   products/reactants  
k (b) is < 1 then is favored to   the reactants because the products are smaller than the reactants.  
k (b) is > 1 then is favored to   the products. this is a typical for reactions that go, to compleation and not equilibrium.  


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