A catalyst lowers activation energy, while increasing temperature has the opposite effect. Concentration and pressure do not directly affect activation energy.
A catalyst will lower the activation energy for a reaction. By providing an alternative, lower energy pathway, a catalyst reduces the amount of energy required to start the reaction.
Increasing the temperature of a reaction actually increases the number of reactant particles that have more energy than the activation energy, making it harder to lower the activation energy.
Increasing the concentrations of reactants and increasing pressure do not have a direct impact on lowering the activation energy.
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