unit 3 Flashcards
What does equilibrium mean
Rate of forward reaction is equal to the rate of reverse reaction.
when Kc > 1eq shifts
right favouring products
when Kc < 1 eq shifts
left favouring products
homogeneous equillibruim
when all states in an equation are the same
heterogeneous equillibruim
when not all the states in an equation are the same
if Qc > Kc the system
moves left ( more reactants formed )
if Qc < kc the system
moves right ( more products formed
if Qc = Kc the sytem
is at equillibruim
what is chateliers principle
When any external stress is introduced to a system the system will adjust itself to reach a new position of equillibrium
in a two step process when species is shown first in the reactants and then in the products what is the species purpose
a catalysist
Define activation energy
the minium amount of energy available for the reactants
where is the activation energy on an exothermic curve
c ^
___/ \ a
b \____
Section C
where is the activation energy on an endothermic curve
^ c
a / \____
___/ b
^ c
Section A
collision theory statements (3)
1- molecules must collide for reaction to occur
2 - molecules must collide with the correct orientation
3- molecules must collide with enough energy
or
All collisions with the required activation energy and the correct orientation result in a chemical reaction.
to make a reaction go quicker what would you do to the temperature
increase it
what would happen to the system when you increase the pressure
equilibruim would shift toward the side of the reaction that has more moles
volume will decrease
what can you do to the pressure in a closed system
you cant increase or decrease the pressure of a closed system
how does a catalyst increase rate of reaction
By speeding up the time the reaction takes to reach equilibruim
what would happen to the system when you decrease the pressure
equilibruim would shift toward the side of the reaction that has less amount of moles
volume will increase
what causes the change of the numerical value of an equilibrium constant
change in temperature
