chemical equlibrium Flashcards
equilibrium only applies to what substances?
This only applies to reactants and products in aqueous solutions or gaseous state.
(Changing the amount of a reactant or product in solid or liquid state to a system at equilibrium
will not affect the equilibrium.)
What will happen if the concentration of SO2 is increased?
According to Le Châtelier’s Principle, the equilibrium position will shift to the right in order
to remove SO2.
What will happen when there is addition of hydrochloric acid to the mixture
The solution turns from yellow to orange. The concentration of H+ ions increases.
According to Le Châtelier’s Principle, the equilibrium position shifts to the right to remove
the added H+ ions.
What will happen when there is addition of potassium hydroxide solution to the mixture
The solution turns from orange to yellow. KOH will neutralize the H+ ions and cause the
concentration of H+ ions to decrease. According to Le Châtelier’s Principle, the
equilibrium position shifts to the left to produce more H+ ions.
how do you change the pressure of a reaction system involving gaseous components?
(list the 2 ways)
1) Add or remove a gaseous reactant or product
2) Change the volume of the container
what happens for systems involving gaseous components?
When the volume of the container holding a gaseous system is reduced, the system responses
by reducing its own volume. This is done by decreasing the total number of gaseous molecules in the system.
what happens when the volume of the container is decreased?
When the volume of the container holding a gaseous system is reduced, the system responses
by reducing its own volume. This is done by decreasing the total number of gaseous molecules in the system.
What will happen if the pressure is decreased?
According to Le Châtelier’s Principle, the equilibrium position will shift to the left as the
reverse reaction will produce greater number of moles of gaseous particles to increase
the pressure.
what happens when the temperature of a system at equilibrium is increased?
the equilibrium position will shift
to the endothermic side of the reaction to absorb the added heat
what happens if a system has equal number of moles of gas molecules on either side of the equation?
a change in pressure of the system has no effect on the equilibrium position. Increase in
pressure will only increase the rate of attaining equilibrium in the reaction.
what happens when the temperature of a
system at equilibrium is decreased?
the equilibrium position will shift to the exothermic side to release more heat
what happens when temp is increased?
When the temperature is increased, heat is added to the system. According to Le Châtelier’s
Principle, this causes the position of equilibrium to shift to the left as the reverse reaction is
endothermic and would absorb the added heat.
