ES 4 Flashcards
What is equilibrium?
A state of balance where nothing changes
What is required for a reaction to be in equilibrium?
A closed system
What happens when a system is at equilibrium?
Molecules enter and leave at the same rate
How do we know when the system has reached equilibrium?
The rates of the forward and reverse reactions are the same
Kc unit
Mol dm-3
Kc of aA + bB = cC + dD
[C]^c [D]^d / [A]^a [B]^b
What do the square brackets mean?
Concentration of
What is Kc?
The equilibrium constant
Kc equation
[products] / [reactants]
What does it mean if Kc>1?
More products than reactants at equilibrium
What does it mean if Kc»1?
Greater than 10^10
Reaction appears to have gone to completion
What does it mean if Kc<1?
More reactants than products
What does it mean if Kc«1?
Less than 10^-10
Reaction appears to not have happened
