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Reversible Reactions and Equilibrium
vocab and main ideas- 18.2
22
Chemistry
11th Grade
05/15/2009

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Term
a reaction in which the conversion of reactants into products and the conversion of products into reactants occur simultaneously
Definition
reversible reaction
Term
a state of balance in which the rates of the forward and reverse reactions are equal; no net change in the amount of reactants and products occurs in the chemical system
Definition
chemical equilibrium
Term
in what does no net change occur at chemical equilibrium?
Definition
the actual amounts of the components of the system
Term
the relative concentrations of reactants and products of a reaction that has reached equilibrium; indicates whether the reactants or products are favored in the reversible reaction
Definition
equilibrium position
Term
when a stress is applied to a system in dynamic equilibrium, the system changes in a way that relieves the stress
Definition
Le Chatelier's principle
Term
what kinds of stresses in a chemical system upset the equilibrium?
Definition
changes in the concentration of reactants or products, changes in temperature, and changes in pressure
Term
(Keq) the ratio of product concentrations to reactant concentrations at equilibrium, with each concentration raised to a power equal to the number of moles of that substance in the balanced chemical equation
Definition
equilibrium constant
Term
what does a Keq value of greater than 1 mean?
Definition
the products are favored over reactants
Term
what does a Keq value of less than 1 mean?
Definition
reactants are favored over products
Term
what is an equation called when the reactants form products?
Definition
a forward reaction
Term
what is a reaction called when the products form reactants
Definition
a reverse reaction
Term
what does a double equation in a chemical equation indicate
Definition
a reversible reaction
Term
how does a catalyst affect a reversible reaction
Definition
it affects the forward and reversible reactions equally
Term
are chemical reactions at equilibrium in a dyanmic state (both forward and reverse reactions occur at the same rate)?
Definition
yes
Term
what is the favored side of an equation?
Definition
the side with a higher concentration
Term
what are three stresses that upset the quilibrium of chemical equations
Definition
concentration, temperature and pressure
Term
what happens if you add more of a reactant to a chemical reaction at equilibrium?
Definition
the products are favored
Term
if you add more of a substance to one side of a chemical equation?
Definition
the other side is favored
Term
what happens if you add heat to a chemical equation at equilibrium?
Definition
the side that absorbs heat will be favored
Term
what happens if you add pressure to a chemical reaction at equilibrium?
Definition
the side with less gases is favored
Term
what does a Keq value of less than one mean?
Definition
reactants are favored
Term
what does a Keq value of more than one mean?
Definition
products are favored
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