Le Chatelier's Principle: This principle states that if a change is applied to a system at equilibrium, the system will adjust itself in such a way as to counteract that change and restore equilibrium.
Reaction Quotient (Q):This is similar to Kc but it measures the relative amounts of products and reactants present during any point in a reaction when it hasn't reached equilibrium yet.
Dynamic Equilibrium:This refers to a state where forward and reverse reactions occur at equal rates so there's no net change in concentration of reactants or products.