Le Chatelier's Principle: A principle stating that when stressors are applied to an equilibrium system, such as changes in concentration, pressure, or temperature, the system will shift in order to minimize those stresses.
Q (Reaction Quotient):Similar conceptually to K but calculated using concentrations or partial pressures of reactants and products at any point during a reaction rather than solely at equilibrium.
Equilibrium Expression: Mathematical representation of an equilibrium reaction using concentrations or partial pressures of reactants and products.