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Chapter 8 Part 2
Reversible reactions and chemical equilibrium
23
Chemistry
Undergraduate 1
07/16/2006

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Term
What do you have at the end of a reaction that only goes part way to completion?
Definition
starting materials and products
Term
when a reaction only goes part way to completion this is due to what?
Definition
relative stability of reactants and products
Term
When a reaction only goes part way to completion, they are said to have
Definition
reached equilibrium
Term
what do two arrows in a reaction mean?
Definition
that the reactions can be produced in either direction
Term
when there are two arrows, are both reactions happening at the same time, or do they alternate
Definition
they are happening at the same time
Term
what happens to the concentration of the products and reactants when a reaction is at equilibrium?
Definition
they will not change
Term
what do the graphs for rate and concentration look like?
Definition
see slide show
Term
what is the equilibrium constant equation?
Definition
products over reactants equals a constant k. It differs with every reaction and changes with temperature
Term
when equilibrium value is greater than one
Definition
the products are favored
Term
when the constant is less than one
Definition
the reactants favored
Term
when stress is applied to a system already in equilibrium?
Definition
the position of equilibrium will shift to relieve the stress
Term
do catalysts shift the equilibrium
Definition
no, only speeds the rate of reaction
Term
what else, besides stress, effect the position of equilibrium?
Definition
concentration, temperature, pressure
Term
is heat treated as a reactant or product?
Definition
either
Term
changing pressure of a single component can be related to
Definition
changing concentration
Term
the equilibrium constant relates to the relative
Definition
energy of the reactants and products
Term
does entropy decrease or increase from reactants to products?
Definition
it depends which side has a greater number of particles
Term
position of equilibrium
Definition
an indication of the relative amounts of reactants and products present at equilibrium
Term
equilibrium expression
Definition
an equation relating the equilibrium constant and reactant and product equilibrium concetrations
Term
equilibrium constant
Definition
a numerical relationship between reactant and product concentrations in a reaction at equilibrium
Term
state of equilibrium
Definition
a condition in a reaction system when the rates of the forward and reverse reactions are equal
Term
equilibrium concentration
Definition
the unchanging concentrations of reactants and products in a reaction system that is in a state of equilibrium
Term
three ways you could speed up a reaction?
Definition
heat, catalyst, increase concentration
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