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### 27 Cards in this Set

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 Rate of Reaction a measure of the rate at which a reactant is used up or a product is formed. Rate Unit Moles per Liter per Second (mol/LS) Reversable Reaction one which can occur in both directions order of reaction determined from the exponents of the concentration terms in the rate equation overall oreder the sum of the exponents of those concentration terms in the rate equation varying unit rate constant half-life (t 1/2) the time required for half the concentration of the limiting reactant to be consumed. integrated rate laws equations which relate concentrations and time. FIRST ORDER EQUATIONS log([Ao]/[A])=kt/2.303 or ln([Ao]/[A])=kt Rate for FIRST ORDER EQUATIONS Rate=k[A] to find the Rate for Second Order Equations: Rate=k[A]2 or Rate=k[A][B] to find the TIME for Second order reactions: 1/[A] - 1/[Ao] = kt half-life for second order equations: T1/2 = 1/k[Ao] to find the Rate for Zero Order Equations Rate=k[Ao] half-life for zero order reactions: t1/2 = [Ao]/2k Reaction Quotient Q= [C][D] ------ [A][B] Reaction Quotient = Products over Reactants. At equilibrium, the reaction quotient... becomes a constant. Law of Mass Action when a reversible reaction has attained equillibrium, at a given temperature, the reaction quotient remains constant. equilibrium constant 0.640 La Chateliev's Principle if a stress is placed on a system at equalibrium, the equalibrium shifts to offset that stress. Van't Hoff's Law when the temperature of a system in equilibrium is raised, the equilibrium is displaced in such a way that the heat is absorbed. Four ways to shift the equilibrium: 1. change the concentrations of the reactants or products. 2. change the pressure (gas only) 3. change the temperature 4. add a catalyst with INCREASED PRESSURE, equilibrium shifts to... the side with the fewest moles of gas. with DECREASED PRESSURE, equilibrium shifts to... the side with the most moles of gas. with ADDED REACTANT, the equilibrium shifts... to the right. with ADDED PRODUCT, the equilibrium shifts... to the left. a change in temperature changes... the value of the equilibrium constant.