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    16.2 Activation energy 

    Understanding ​

    1. The Arrhenius equation uses the temperature dependence of the rate constant to determine the activation energy.
    Guidance
    Use energy level diagrams to illustrate multi-step reactions showing the RDS in the diagram.
    1. A graph of 1/T against lnk is a linear plot with gradient –Ea/R and intercept InA.
    2. The frequency factor (or pre-exponential factor) (A) takes into account the frequency of collisions with proper orientations.

    Applications and skills

    1. ● Analysing graphical representation of the Arrhenius equation in its linear form k
      −E
      RT
      ln = a +lnA .
      ● Using the Arrhenius equation k Ae
      E
      RT
      a
      =
      −
      .
      Guidance
      ● Consider various data sources in using the linear expression k
      RT
      ln = +lnA
      −Ea .
      ● The expression
      k
      R
      ln =
      E1 a
      k2
      1
      T2
      1
      T1
      ( − ) is given in the data booklet.
      ● Describing the relationships between temperature and rate constant; frequency factor and
      complexity of molecules colliding.
      ● Determining and evaluating values of activation energy and frequency factors from data.

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