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Chapter number: 9 Chapter name: chemical equilibrium Class: 10th class chemistry online lectures or Matric part 2 chemistry lectures Subject: chemistry online lectures Board: Punjab text book chemisty Teacher Name: Majid Ali (Gold Medalist in chemistry) Macroscopic characteristics of dynamic equilibrium A few important characteristic features of dynamic equilibrium are given below: 1. An equilibrium is achievable only in a closed system (in which substances can neither leave nor enter). 2. At equilibrium state, a reaction does not stop. Forward and reverse reactions keep on taking place at the same rate but in opposite direction. 3. At equilibrium state, the amount (concentration) of reactants and products do not change. Even physical properties like colour, density, etc. remain the same LAW OF MASS ACTION Guldberg and Waage in 1869 put forward this law. According to this law “The rate at which a substance reacts is directly proportional to its active mass and the rate of a reaction is directly proportional to the product of the active masses of the reacting substances”