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Important to note catalysts lower Ea, through altering and lowering the transition state of the reactants. They can affect orientation to idealize reactants' position for a reaction, or also weaken bonds of reactants to make them easier to break.
haleyervin7 wrote:Is there any case where there must be a catalyst for a reaction to occur?
You can think about enzymes, which are considered catalysts, in biological scenarios where they are required for some reactions to occur.
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