chemical eqilibrium: the equilibrium Flashcards
when is a chemical reaction in equilibrium?
when the composition of the reactants and products remains constant indefinitely
what does the equilibrium constant (K) characterise?
the equilibrium composition of the reaction mixture
What are a, b, c and d?
the stoichiometric coefficients in the balanced reaction equation
what does the value of an equilibrium constant indicate?
position of the equilibrium
equilibrium constants must have…
no units
what are the concentrations of pure solids and pure liquids at equilibrium taken as and what value are they given in the equilibrium expression?
taken as: constant
value of: 1
what does the numerical value of the equilibrium constant depend on?
-the reaction temperature
-it’s independent of concentration and/or pressure
In endothermic reactions, what does a rise in temp cause an increase in?
-K
-yield of product
In exothermic reactions, what does a rise in temp cause a decrease in?
-K
-yield of product
what effect does the presence of a catalyst have on the value of the equilibrium constant?
no effect
