• The rate-determining step is the slowest step in the sequence of steps in a reaction mechanism.
  • Catalysts lower the overall activation energy for a reaction by providing an alternative mechanism for the reaction to follow.
  • The decomposition of hydrogen peroxide is discussed below and illustrates how reaction mechanisms can be determined through experimental studies.
  • The iodide ion catalyst also appears in the mechanism.
  • It is consumed in the first elementary step and then is regenerated in the second step.
  • That is the requirement for a catalyst – that is that it is not used up in the reaction.
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