Equilibria Flashcards
(15 cards)
How is Kc calculated ?
Concentration of Product divided by Concentration of Reactant.
What does it mean if Kc is less than 1 ?
Equilibria favours the left hand side
What does it mean if Kc is more than 1 ?
Equilibria favours the RHS
(Concentraton of product is higher than Concentration of reactant)
What does it mean if Kc equals 1?
The equilibrium is equal on both sides
What is the formula used to work out kc from the rates of the forward and backward reactions ?
What does this formula mean ?
kc=k1/k2
it means the same equilibrium constant can be achieved at different rates
What is the only variable that effects Kc ?
temperature will affect the position of equilibrium and therefore the value of kc.
What is the formula of a rate equation ?
rate=k[A][B]
rate= k1[A][B]
A+B——–C
What is the formula for calculating kc from a three component equilibria?
[A][B][C]
kc has been flipped around to make it easier to get the units
kc now= k2/k1
What is the formula used to calculate kc from a four component equilbria
[C]c [D]d = a constant, (Kc)
[A]a [B]b
Why might the rate constant of a revere reaction be lower?
(slower reaction rate )
activation energy is higher
What is kc determined by if kc=k1/k2
determined by the difference in activation energy between the two sides of the equilibrium as activation energy is what effects the values of k1 and k2. Therefore if there is a difference in activation energy the rate of the forward and backward reactions will occur at a different rate.
Why do different equilibria have different equilibrium constants ?
Different equilibria have different equilibrium constants as a result of difference in energy (G) between the sides of the equilibrium, and form at different rates due to differences in Ea
How is Gibbs energy change calculated ?
AG=AH-TAS
reaction is feasible if AG is less than or equal to zero
Does a catalyst have any affect on the POE ?
no, only affects rate at which the forward and backwards reactions occur as they find an alternate route for the reaction pathways to happen that has a lower activation energy.
