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27 Cards in this Set
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 Back
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


halflife (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


halflife for second order equations:

T1/2 = 1/k[Ao]


to find the Rate for Zero Order Equations

Rate=k[Ao]


halflife 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.
