La Chateleirs Principle Flashcards
what does the equilibrium do when you add something
it works away from whatever you add
what happens if you increase the temperature in an exothermic reaction where heat acts like a product
the reaction shifts to the left
how does a graph show that a substance has been added or removed from an equilibrium
a spike in either a reactant or product (just one) will occur, and a gradual change will be present in the other entities
what happens if you change the temperature of a reaction by more then a few degrees
the Kc value will change
what happens to pressure if volume is decreased
pressure increases
how do temperature/energy changes appear on a graph
as a gradual change with an opposite change in the products
according to le chatliers principle, what will happen to the reaction if it is disturbed by the addition of a product/the removal of a reactant
the equilibrium will shift left/towards the reactants
what happens if the K value gets bigger and how does this shift the reaction
more products are being created which shifts the reaction to the right
how does a decrease in volume affect an equilibrium
it causes the reaction to shift in the direction which contains the fewest moles of gas
what happens if both sides of a chemical equation have the same number of moles of gas
the change in volume of the container has no effect on the equilibrium
what does removing something do that substances concentration
it decreases it
what shifts occur in an equilibrium when you add or remove solids
no shifts occur when you add/remove solids becuase they are constant and do not appear in expressions for K
how does temperature affect energy
if temperature decreases, energy decreases; if temperature increases, energy increases
is there any spikes present in an energy change graph
no spikes, only gradual changes
what happens if you increase the temperature in an endothermic reaction where heat acts like a reactant
the reaction shifts to the right
is heat equal to Kc value
no
what happens if you decrease the temperature in an exothermic reaction where heat acts like a product
the reaction shifts to the right
what happens to the K value of a reaction when a catalyst is added? why?
there is no effect on its magnitude because catalysts increase both the forward and backward rate of reaction
what type of relationship do volume and pressure have
an inverse relationship so that when one substance increases or decreases the other does the opposite
what is Kc dependent on
temperature
what happens when you add more of a reactant
more products will be produced
what happens to temperature if energy is increased
temperature increases
does a catalyst affect equilibrium
no
what does adding something do to that substances concentration
it increases it
what are the three common ways an equilibrium may be disturbed
change in the concentration of a reactant or product, change in temperature, change in the volume
what happens to the products when you remove some of a reactant
less products will be produced
what is la chatliers principle
when a system at equilibrium is disturbed, the new equilibrium shifts in the direction that opposes the change, until a new equilibrium is reached
what does the equilibrium do when you remove something
it works towards whatever you remove
how does an increase in volume affect an equilibrium
it causes the reaction to shift in the direction which contains the most moles of gas
what happens if you decrease the temperature in an endothermic reaction where heat acts like a reactant
the reaction shifts to the left
what happens to pressure if volume is increased
pressure decreases
what happens to temperature if energy decreases
temperature decreases
