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Three of these are wrong. Find the one that holds.

Exercise and reference answers

Questions
  1. Question
    Three of these statements about molecularity are false.
    Choices
    1. Item
      Defined only for elementary reactions
      Correct
      Yes
    2. Explanation
      Molecularity runs from 1 to 3.
      Item
      It can be zero
    3. Explanation
      Only ORDER can be fractional.
      Item
      It can be a fraction
    4. Explanation
      It comes from the proposed mechanism, not measurement.
      Item
      It is found by experiment
  2. Question
    Three of these statements about activation energy are false.
    Choices
    1. Item
      Activated complex minus reactant energy
      Correct
      Yes
    2. Explanation
      A catalyst LOWERS the activation energy.
      Item
      A catalyst raises it
    3. Explanation
      It is a difference, not the product energy.
      Item
      It is the energy of the products
    4. Explanation
      A higher barrier slows the reaction.
      Item
      Raising it speeds the reaction up

Explanation

Each trap is a real confusion between the measured and the mechanistic. Source: syllabus Chemistry Part I, Ch 3 Chemical Kinetics.
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