Unformatted text preview: · A catalyst speeds up a reaction by lowering the activat ion energy while not changing the energy of the reactants or products.
· Since a catalyst affects both the rate of the forward and reverse react ions equally, it does not affect the equilibrium. EFFECT of CHANGES on EQUILIBRIUM Factor Concentration Temperature Pressure Volume Catalyst Change (stress) Add reactant Remove reactant Add product Remove product Raise T for endothermic react ion Lower T for endothermic reaction Raise T for exothermic react ion Lower T for exothermic reaction Increase pressure Decrease pressure Increase vo lume Decrease vo lume Add catalyst 8 Shift in Equilibrium Forward ® Reverse ¬ Reverse ¬ Forward ® Forward ® Reverse ¬ Reverse ¬ Forward ® Shift s towards less mo les Shift s towards more mo les Shift s towards more mo les Shift s towards less mo les No effect Chemistry 52 Chapter 16 EQUILIBRIUM CONSTANTS
· At equilibrium the rates of the forward and reverse reactions are equal, and the concentrations of the reactants and products are constant.
· The equilibri...
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