The equilibrium constant (K) is a number that expresses how far a chemical equation proceeds forward towards products at equilibrium conditions.
The principle that states if a system at equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change.
A measure of the relative amounts of products and reactants present during a reaction at a particular point in time.
The state in which both reactants and products are present in concentrations which have no further tendency to change with time.