Dynamic Equilibrium
This is achieved when the forward and reverse reaction are ocurring at equal rates. As a result, the concentrations of all species present remain constant.
Concentration
Concentration = Number of moles / Volume in dm³
K꜀
K꜀ = [C]ᶜ [D]ᵈ / [A]ᵃ[B]ᵇ
(at constant temperature)