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Equilibrium
chapter from my chem book.
22
Chemistry
10th Grade
06/06/2010

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Term
chemical equilibrium
Definition
the state in which the concentrations of reactants and products remain constant with time because the rate at which they are formed in each reaction equals the rate at which they are consumed in the opposite reaction.
Term
reversible reactions
Definition
a chemical reaction in which the products can regenerate the original reactants.
Term
law of mass action
Definition
expresses the relative concentrations of reactants and products at equilibrium in terms of a quantity called the equilibrium constant.
Term
equilibrium constant
Definition
found by an equilibrium expression. measure of the extent to which a reaction proceeds to completion.
Term
law of chemical equilibrium
Definition
every reversible reaction proceeds to an equilibrium state that has a specific ratio of the concentrations of reactants and products expressed by Keq
Term
Keq =
Definition
[C]^c[D]^d/[A]^a[B]^b from aA + bB <=> cC + dD
Term
equilibrium position
Definition
set of equilibrium concentrations. there is an infinite number of these, but only on equilibrium constant.
Term
homogenous equilibria
Definition
equilibrium conditions for reactions in which all the reactants and products are in the same state.
Term
heterogenous equilibria
Definition
equilibrium conditions for reactions that involve substances in more than one state.
Term
reaction quotient (Q)
Definition
is used to determine if a reaction is at equilibrium. if QKeq, reaction will proceed to left (reactants). If Q = Keq, system is at equilibrium, and no shift will occur.
Term
Le Chatelier's Principle
Definition
If a change in conditions is imposed on a system at equilibrium, the equilibrium position will shift in the direction that tends to reduce that change in conditions.
Term
Haber process
Definition
An industrial process through which ammonia is synthesized. The process depends upon Le Chatelier's principle to maximize the yield of ammonia.
Term
dissolution
Definition
the process in which an ionic solid dissolves in a polar liquid.
Term
precipitation
Definition
the process by which ions leave a solution and regenerate an ionic solid.
Term
solubility equilibrium
Definition
when a saturated solution of ions and the remaining solid are in chemical equilibrium.
Term
solubility product (Ksp)
Definition
used for aqueous solutions of dissociated ions
Term
ion product (Q)
Definition
can be compared with the solubility product to determine if an aqueous solution of ions is supersaturated and will form a precipitate.
Term
precipitation reaction
Definition
a reaction in which two solutions are mixed and a precipitate forms. described by balanced equations.
Term
complete ionic equation
Definition
equation that shows all soluble ionic substances as ions. found by writing each original solution as the sum of its constituent ions.
Term
spectator ions
Definition
ions that do not take place in the chemical reaction and are found in solution both before and after the reaction.
Term
net ionic equation
Definition
complete ionic equation minus the spectator ions. includes only those compounds and ions that undergo a chemical change in a reaction in an aqueous solution.
Term
common-ion effect
Definition
shift in equilibrium that occurs because the concentration of an ion that is part of the equilibrium is changed.
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