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COMEDK Chemical Kinetics — practice questions — page 2

Explore 47 free Chemical Kinetics questions in COMEDK Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Kinetics questions and exercises with answers

Showing questions 31–47 of 47.

Tap everything that raises the rate of a reactionRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →The Arrhenius equationRead the answer and worked solution →Order the steps: find the order of a reactionRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →True or false: what kinetics studiesRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Tap every factor the chapter says affects the rateRead the answer and worked solution →Complete the collision theory modificationRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →Assertion and reason: rates and constantsRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Order the energy story of a reactionRead the answer and worked solution →True or false: the Arrhenius pictureRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →

Worked practice questions

Tap everything that raises the rate of a reaction

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Questions
  1. Items
    1. Text
      Raising the temperature
      Matches the category
      Yes
    2. Text
      Lowering the activation energy
      Matches the category
      Yes
    3. Text
      Adding a catalyst
      Matches the category
      Yes
    4. Text
      Raising the activation energy
      Matches the category
      No
    5. Text
      Cooling the mixture
      Matches the category
      No
    Category
    Raises the rate of a reaction
  2. Items
    1. Text
      Provides an alternate reaction path
      Matches the category
      Yes
    2. Text
      Lowers the activation energy
      Matches the category
      Yes
    3. Text
      Raises the activation energy
      Matches the category
      No
    4. Text
      Changes the order to zero
      Matches the category
      No
    Category
    True of a CATALYST
syllabus names the factors explicitly, and lowering Ea is one of them. Source: syllabus Chemistry Part I, Ch 3 Chemical Kinetics.

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Assertion and reason

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Questions
  1. Reason
    The rate law is an experimental result, not a stoichiometric one.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A rate law cannot be written from the balanced equation alone.
  2. Reason
    It lowers the activation energy by opening an alternate path.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A catalyst speeds a reaction up.
  3. Reason
    Order is found experimentally and may be fractional.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    Molecularity can be a fraction.
  4. Reason
    In k = Ae^(−Ea/RT), a larger T makes the exponent less negative.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Raising the temperature raises the rate constant.
The reason must genuinely explain the assertion. Source: syllabus Chemistry Part I, Ch 3 Chemical Kinetics.

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The Arrhenius equation

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Questions
  1. Question
    In k = Ae^(−Ea/RT), raising T
    Choices
    1. raises k
    2. lowers k
    3. leaves k unchanged
    Correct choice
    raises k
  2. Question
    Lowering Ea
    Choices
    1. lowers k
    2. raises k
    3. leaves k unchanged
    Correct choice
    raises k
  3. Question
    The factor A corresponds to
    Choices
    1. activation energy
    2. the order
    3. collision frequency
    Correct choice
    collision frequency
  4. Question
    The steric factor P accounts for
    Choices
    1. orientation of colliding molecules
    2. temperature
    3. concentration
    Correct choice
    orientation of colliding molecules
Two levers change the rate constant: temperature and activation energy. Source: syllabus Chemistry Part I, Ch 3 Chemical Kinetics.

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