19.2 - The equilibrium constant Kp Flashcards
What is the mole fraction?
The mole fraction of a gas = number of moles of A / total number of moles in a gas mixture
What is partial pressure?
Partial pressure is the contribution that the gas makes towards the total pressure P.
Partial pressure = mole fraction x total pressure
What is Kp?
Similar to Kc but the partial pressures replace the concentration terms.
How is the value of K affected?
The value of K is affected by altering the temperature.
How do change in concentration and pressure affect equilibrium constant?
The value of an equilibrium constant K is unaffected by changes in concentration or pressure.
This is because the equilibrium position shifts.
What happens if the concentration of a reactant increases?
The equilibrium constant changes, so the concentrations must change to return the ratio back to the Kc value.
It does this by making more products to decrease the conc of reactants and increase the conc of products.
What happens if the pressure of an equilibrium system is doubled?
The partial pressures and concentrations of both the reactants and products will double
Why does adding a catalyst not change the equilibrium position?
Catalysts affect the rate of a reaction but not the position of equilibrium, as they speed up both the forward and reverse reactions by the same factor.
