A chemical equilibrium: A reversible chemical reaction is at equilibrium under certaln conditions: D正=D逝≠0 The basic features of chemical equilibrium: (1)the composition of an equilibrium mixture undergoes no further change with time. (2)chemical equilibria are dynamic. (3)the equilibrium composition is independent of the path of approach.A chemical equilibrium ： υ 正 = υ 逆 ≠ 0 A reversible chemical reaction is at equilibrium under certain conditions: The basic features of chemical equilibrium ： (1) the composition of an equilibrium mixture undergoes no further change with time. (2) chemical equilibria are dynamic. (3) the equilibrium composition is independent of the path of approach