This guided inquiry activity was developed to help students "view" an equilibrium system from the particulate level and make connections to their macroscopic observations. Part I helps students observe a physical equilibrium system in which water is transferred between two larger containers. In Part II, students examine what happens to a chemical equilibrium system when various "stresses" are applied. In Part III, the chemical system from Part II is examined using bingo-type chips to represent the reactants and products. This should help students visualize what happens to the reactant and product species in an equilibrium system when a stress is applied. Students use the equilibrium constant (K[subscript eq]) to determine whether a reaction is at equilibrium. Then, by adding or removing "particles," students determine whether more reactants or products than before are made as a result of the changes. This article focuses on a portion of Part III of the activity. (Contains 3 figures and 1 online resource.)