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Effect of a Catalyst on Reaction Rate: with a lower Ea than for the uncatalyzed reaction. This is shown as the blue path with Ea in the diagram below t a given temperature, a catalyst increases the rate of a reaction by providing a pathway E (RJ) products Reaction Coordinale Since the potential energy barrier is lower in the presence of a catalyst, a greater fraction of the molecules will have sufficient energy to react. Because the reactants and products remain unchanged for the overall reaction in the presence of a catalyst, E does not change. Effect of Concentration on Reaction Rate The more molecules there are per unit volume, the more frequently collisions will occur. If the rate of a reaction depends on the frequency of effective collisions, an increase in concentration will increase the rate of the reaction. A reaction profile (not to scale) for the reaction 2HI → H2 + 12 is shown here: E (kJ) H2+la 184 13 HI+ HI Reaction Coordinabe
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Effect of a Catalyst on Reaction Rate: with a lower Ea than for the uncatalyzed reaction. This is shown as the blue path with

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