[PDF] Lesson 4 equilibrium - interpreting equilibrium graphs Equilibrium systems are often depicted using concentration-time graphs and rates graphs. It is handy to know how changes to a chemical system, at equilibrium, influences the concentration-time and rate graphs of that system. 1) At equilibrium the rates of the forward and backward reactions are equal. Remember, it is a dynamic equilibrium. Hence the rates graph should indicate that both the forward and backward rates are equal Equilibrium questions (practice) | Khan Academy Equilibrium questions. Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501(c)(3) nonprofit organization. Donate or volunteer today!