Chemical Kinetics Quiz
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Questions and Answers

What describes the concentration change over time for a first-order reaction?

  • It remains constant over time.
  • It decreases exponentially. (correct)
  • It decreases in a parabolic manner.
  • It increases linearly.

    • Which equation represents the relationship of concentration and time for a first-order reaction?

  • ln[A]t = −kt + ln[A]0 (correct)
  • [A]t = k[A]0
  • [A]t = [A]0e^kt
  • ln[A]t = ln[A]0 + kt

    • What is the significance of the slope in the first-order reaction plot of ln[A] versus time?

  • It is equal to the rate constant, -k. (correct)
  • It represents the initial concentration.
  • It indicates the total concentration at any time.
  • It shows the maximum possible concentration.

    • In which scenario would you observe a linear plot of concentration versus time?

    <p>If the reaction is zeroth-order.</p> Signup and view all the answers

    How does temperature affect the reaction rate according to chemical kinetics?

    <p>It generally increases the reaction rate.</p> Signup and view all the answers

    What characteristic defines a second-order reaction in terms of time and concentration?

    <p>The rate is proportional to the square of the concentration.</p> Signup and view all the answers

    What can be determined from an Arrhenius plot?

    <p>The activation energy can be derived.</p> Signup and view all the answers

    What is the characteristic half-life expression for a first-order reaction?

    <p>It remains the same regardless of initial concentration.</p> Signup and view all the answers

    What does the Arrhenius equation express about the rate constant 'k'?

    <p>k decreases exponentially with increasing activation energy.</p> Signup and view all the answers

    Which of the following statements is true regarding catalysts?

    <p>Catalysts change form during the reaction but are recovered at the end.</p> Signup and view all the answers

    In the Arrhenius equation, what effect does increasing temperature (T) have on the rate constant (k)?

    <p>It increases k exponentially.</p> Signup and view all the answers

    What is the purpose of creating an Arrhenius plot?

    <p>To find the relationship between rate constant and temperature.</p> Signup and view all the answers

    What is the primary role of a biological catalyst?

    <p>It facilitates reactions at body temperature.</p> Signup and view all the answers

    How does a catalyst alter a chemical reaction?

    <p>By lowering the activation energy required.</p> Signup and view all the answers

    Which type of catalyst operates in the same phase as the reactants?

    <p>Homogeneous catalyst.</p> Signup and view all the answers

    What is the significance of the slope in the Arrhenius plot?

    <p>It equals -Ea/R.</p> Signup and view all the answers

    What is indicated by a linear plot of [A] versus Time in a reaction?

    <p>The reaction is zeroth-order.</p> Signup and view all the answers

    What happens to the half-life of a second-order reaction over time?

    <p>It doubles continuously.</p> Signup and view all the answers

    How does an increase in temperature affect chemical reactions according to Collision Theory?

    <p>It increases the number of successful collisions.</p> Signup and view all the answers

    What is the purpose of a catalyst in a chemical reaction?

    <p>To offer a pathway with lower activation energy.</p> Signup and view all the answers

    In which type of reaction does the half-life halve continuously during the reaction?

    <p>Zeroth-order reaction.</p> Signup and view all the answers

    What denotes a first-order reaction when examining a plot of ln[A] versus Time?

    <p>A straight line.</p> Signup and view all the answers

    What does the Arrhenius equation relate to in chemical kinetics?

    <p>Rate constant, activation energy, and temperature.</p> Signup and view all the answers

    If a plot of 1/[A] versus Time yields a straight line, what can be concluded?

    <p>The reaction is second-order.</p> Signup and view all the answers

    What defines the half-life of a first-order reaction?

    <p>It is constant and independent of the concentration of the reactant.</p> Signup and view all the answers

    Which equation correctly represents the half-life of a second-order reaction?

    <p>$t_{1/2} = \frac{1}{k[A]_{0}}$</p> Signup and view all the answers

    What is the shape of the plot for a second-order reaction when graphed as $1/[A]$ versus time?

    <p>Straight line</p> Signup and view all the answers

    In a second-order reaction, what happens to the half-life as the concentration decreases?

    <p>It continuously doubles.</p> Signup and view all the answers

    Which of the following statements about half-life in first-order reactions is correct?

    <p>It can be calculated using $t_{1/2} = \frac{0.693}{k}$.</p> Signup and view all the answers

    Which of the following correctly describes the relationship between rate and concentration in a second-order reaction?

    <p>Rate increases with the square of the concentration.</p> Signup and view all the answers

    What is the integrated rate law equation for a second-order reaction?

    <p>$\frac{1}{[A]} = kt + \frac{1}{[A]_{0}}$</p> Signup and view all the answers

    Which of the following best describes a characteristic of half-lives in second-order reactions?

    <p>They are a function of the initial reactant concentration.</p> Signup and view all the answers

    What is the relationship between the concentration of reactant [A] and time in a zeroth-order reaction?

    <p>[A]t decreases linearly over time.</p> Signup and view all the answers

    In a zeroth-order reaction, which of the following statements about the rate of reaction is true?

    <p>The rate of reaction is constant and equal to k.</p> Signup and view all the answers

    What does the slope of the concentration versus time plot in a zeroth-order reaction represent?

    <p>The rate constant k.</p> Signup and view all the answers

    Which of the following statements about the half-life of a zeroth-order reaction is correct?

    <p>The half-life continuously halves as the reaction progresses.</p> Signup and view all the answers

    What indicates that a reaction is first-order when analyzing plots of [A]?

    <p>The ln[A] versus time plot is linear.</p> Signup and view all the answers

    What is a characteristic of reactions occurring at higher temperatures?

    <p>They occur faster due to increased energy and collision frequency.</p> Signup and view all the answers

    What is the function of activation energy (Ea) in a chemical reaction?

    <p>It is the minimum energy needed for reactants to undergo a successful collision.</p> Signup and view all the answers

    What happens to the concentration of [A] in a zeroth-order reaction as the reaction progresses?

    <p>[A] decreases linearly.</p> Signup and view all the answers

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    Chemical Kinetics 2 PDF

    Description

    Test your knowledge on chemical kinetics with this quiz that covers first-order and second-order reactions, the Arrhenius equation, and the role of catalysts. Explore concepts such as concentration changes over time, temperature effects on reaction rates, and the significance of half-life in reactions.

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