Catalysis is the process of increasing the rate of a chemical reaction by adding a substance Catalyzed reactions have a lower activation energy (rate-limiting free energy of activation) than the corresponding uncatalyzed reaction, resulting in a higher reaction . This effect can be illustrated with an energy profile diagram.
Sketch a possible graph for this reaction, first without a catalyst and then with a catalyst. On both graphs, label the energy of the products and the enthalpy of the reaction. Solution. Because the uncatalyzed reaction is exothermic, the enery of the products will be less than the energy of the reactants.
Principle(s) Investigated: Chemical reactions, conservation of energy, endothermic and exothermic reactions. Standards : 8.5.c Chemical reactions are processes in which atoms are rearranged into different combinations of molecules. As a basis for understanding this concept: Students know chemical reactions usually liberate heat or absorb heat.
Specification Point 3.1: Know that chemical reactions in which heat energy is given out are described as exothermic, and those in which heat energy is taken in are described as endothermic
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