Chemical Equilibria And Kp Flashcards
How do we describe a reaction in equilibrium
- Closed system
- Constant concentrations
- The rate of the forward and backward reaction is equal and occurs simultaneously
what is le chatlier’s principle
When a factor is changed, an equilibrium will shift to oppose that change
How is equilibrium effected by temperature increases if reaction endo
- yield increases
- forward is endothermic
- shift to oppose the increase, so shift to right to decrease temperature
How is equilibrium affected by increase in pressure when equation 4 moles <—-> 2 moles
- increase yield
- more moles on left, less moles on right
- equilibrium will shift to right to oppose increase in pressure
how is equilibrium affected by catalyst
No effect but equilibrium is reached faster
What is the equilibrium constant
Kc = [products]/ [reactants]
What kind of brackets used for equilibria KC
Square as this indicates concentration
Which factor is Kc affected by
Temperature
Units for Kc usually
Mol dm-3
What is the equilibrium constant for Kp
How do we calculate Kp
what factors affect Kp
Only temperature
How to calculate Kc
Take moles/volume of each reactant/product and put it in the Kc equation
