Arrhenius Equation and Chemical Kinetics Quiz
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Questions and Answers

What is the key factor that limits the molecularity of a reaction to never exceed three?

  • Decreased rate of reactions with more than three molecules.
  • Limited chances for molecules to undergo effective collisions. (correct)
  • High energy barrier for reactions with more than three molecules.
  • Complexity of higher order reactions.

    • In a multistep reaction, how is the molecularity determined?

  • By looking at the slowest step only.
  • Only in the first step.
  • By combining the molecularity of all steps.
  • Separately in each step. (correct)

    • In a complex reaction, what is the slowest step called?

  • Rate limiting step
  • Fastest step
  • First order step
  • Rate determining step (correct)

    • What is the overall molecularity of a complex reaction equal to?

    <p>Molecularity of the slowest step</p> Signup and view all the answers

    If a reaction has a molecularity of 1, what is it called?

    <p>Unimolecular</p> Signup and view all the answers

    What does the order of reaction define?

    <p>Number of reactants determining the rate of reaction.</p> Signup and view all the answers

    If a reaction is bimolecular, what is its molecularity?

    <p>2</p> Signup and view all the answers

    Rate constant units for a second-order reaction are:

    <p>$mol L^{n} s^{-1}$</p> Signup and view all the answers

    Rate constant units for a third-order reaction are:

    <p>$mol^{-2} L^{2n-1} s^{-1}$</p> Signup and view all the answers

    What does the Arrhenius equation define?

    <p>Relationship between reaction rate and activation energy</p> Signup and view all the answers

    In the Van’t Hoff differential method, what does 'n' represent?

    <p>Change in activation energy with temperature</p> Signup and view all the answers

    For a pseudo-unimolecular reaction, what does 'V∞' refer to?

    <p>Volume at infinity</p> Signup and view all the answers

    What is the relationship between activation energy (Ea) and threshold energy?

    <p>Ea = Threshold energy - Potential energy of reactants</p> Signup and view all the answers

    Which equation describes the relationship between two different temperatures (T1 and T2) and activation energy (Ea)?

    <p>Ea = 2.303R log10(T2/T1)</p> Signup and view all the answers

    What is the formula for the rate constant (k) in the Arrhenius equation?

    <p>k = Ae or -Ea/RT log</p> Signup and view all the answers

    What is the half-life method used for in chemical kinetics?

    <p>Comparing half-lives of reactions with different orders</p> Signup and view all the answers

    'Order' in chemical kinetics refers to what aspect of a reaction?

    <p>[A]m [B]n in the rate equation</p> Signup and view all the answers

    For a second-order reaction, what does 'dx ∝ [A]1/dt' represent?

    <p>[A] concentration over time for a second-order reaction</p> Signup and view all the answers

    What is the formula for calculating 'n' in the Van’t Hoff differential method?

    <p>Change in activation energy with temperature over difference in concentration logs</p> Signup and view all the answers

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