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### 24 Cards in this Set

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 What is an elementary reaction? An elementary reaction is a reaction that cannot be decomposed into other reactions. T/F A complex reaction can be broken down into two or more elementary reactions. True What is an intermediate? An intermediate is a complex that appears during the course of a reaction but does not appear in the net reaction, or as a final product. What is the rate determining step of a reaction? The rate determining step is the slowest step of a reaction. What is the general formula for the rate law of the following reaction? aA + bB---->cC + dD Rate= k[A]^x[B]^y *remember RATE LAW T/F Rate= - change[reactant]/time or Rate= change [products]/ time True The neg sign indicates loss or reactants What is the reaction order for the following rate law? rate=k[A][B]^2 Reaction order =3 x=1 and y=2 therefore x+y= reaction order Is the rate of a zero order reaction dependant on the concentration of the reactants? No!! A zero order reaction has a constant rate that is independant of the concentration of reactants. look at C34 graph.... resume What is enthaply change of a reaction? Enthalpy change of a reaction is the difference between the potential energy of the products and the potential energy of the reactants. products-reactants= change in delta H How do increasing temperature and reactant concentration affect the rate of reaction? Increasing temperature and reactant concentration increase the rate of most reactions. Can the medium in which a reaction takes place affect the reaction rate? Yes How does a catalyst increase reaction rate? A catalyst increases the reaction rate by decreasing the Ea. What is the reaction RATE of the following one step reaction? 2A + B----> A2B Rate=k[A]^2[B] What is the equ' constant expression for the following reation? A + 3B----> 2C + 2D Keq = [C]^2[D]^2/ [A][B]^3 Does Keq for a reaction remain constant at all temperatures? No..it is characteristic of a given system at a given temperature. Do pure solids and liquids appear in an equ' constant expression? No If there is much more product than reactant at equ', what can be said of Keq (as compared to 1)? Keq whould be greater than one at equ' then is would be close If Keq is very small compared to 1, then what can be said about the amount of reactants and products at equ'? more reactants than productat at equ' According to Le Chatelier's Principle, in which direction will equ' shift if products are removed? equ will shift to favor the forward reaction. How will increasing the pressure affect the following reaction? 4 mole >< 2 moles Increasing pressure will favor the forward reaction. > Towards side with less T/F Increasing the pressure of a system will shift equ' so as to increase the number of moles produced. *** False, increasing the pressure will shift equ' so as to produce fewer mole of gas. How will decreasing the temperaure affect the following reaction? A >< B + heat Decreasing the temperature will favor the foward direction. What happens when you increase the temperature for the same reaction? Increasing temperature will favor the reverse reaction.