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Unformatted text preview: ors the formation of products. 3) In other reversible react ions equilibrium is reached when few reactants have co mbined to form products. In these reactions, we say the equilibrium favors the formation of reactants. 5 Chemistry 52 Chapter 16 CHANGES IN EQUILIBRIUM 4) When a react ion reaches equilibrium, the rate of the forward and reverse reactions are equal, and the concentration of all the co mponents do not change, if the system is left undisturbed. 5) If we disturb a system at equilibrium, by changing the ratio of the reactants to products or by adding or removing heat, we say there is a stress on the equilibrium. 6) When a stress is applied to an equilibrium, then according to Le Chatelier’s principle, the equilibrium will shift to relieve the stress. Effect of Concentration · For most reactions the rate of reaction increases as reactant concentrations increase. · An equilibrium is disturbed when the concentration of one or more of its components is changed. · As a result, the concentration of all species will change and a new equilibrium mixture will be established. · Consider the reversible react ion at equilibrium, shown below: A + B ® C + D Stress: Increase the concentration of B Shift: Increases the rate...
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