Chemical Kinetics
36 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the rate of reaction proportional to?

  • The energy barrier
  • The number of effective collisions
  • The fraction of effective collisions (correct)
  • The number of collisions per unit volume per second

    • What is the term for the energy barrier that must be overcome before products are formed?

  • Threshold energy
  • Activation energy (correct)
  • Energy of reaction
  • Enthalpy of reaction

    • What is the relationship between Ea and Er for endothermic reactions?

  • Ea ≥ Ear
  • Ea < Er
  • Ea = Er
  • Ea > Er (correct)

    • What is the term for the state in which the molecules must have energy at least equal to the threshold energy?

    <p>Activated complex</p> Signup and view all the answers

    What is required for effective collisions to occur?

    <p>Sufficient energy and proper orientation</p> Signup and view all the answers

    How is the rate of reaction related to the collision frequency (Z) and the fraction of effective collisions (f)?

    <p>Rate = Z × f</p> Signup and view all the answers

    What is the branch of physical chemistry that deals with the rate of chemical reactions and the factors that influence them?

    <p>Chemical Kinetics</p> Signup and view all the answers

    What type of reactions are usually molecular in nature and proceed with a measurable rate at normal temperature?

    <p>Moderate reactions</p> Signup and view all the answers

    Which of the following reactions is an example of a very fast or instantaneous reaction?

    <p>AgNO3 + NaCl → AgCl + NaNO3</p> Signup and view all the answers

    What is the main difference between very fast or instantaneous reactions and moderate reactions?

    <p>Reaction rates</p> Signup and view all the answers

    What type of reaction is characterized by extremely slow rates and may take months to show any measurable change?

    <p>Very slow reaction</p> Signup and view all the answers

    What is an example of a moderate reaction that is typically studied in chemical kinetics?

    <p>Decomposition of H2O2</p> Signup and view all the answers

    What is the unit of rate constant in a chemical reaction?

    <p>litre·mol⁻¹·sec⁻¹</p> Signup and view all the answers

    What is the relationship between the rate of a reaction and the concentration of reactants?

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

    What is the molecularity of the reaction NH₄NO₂ → N₂ + 2H₂O?

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

    What is the significance of the slowest step in a reaction mechanism?

    <p>It is the rate-determining step.</p> Signup and view all the answers

    What is the overall order of a reaction given by the rate law Rate = [A]x[B]y?

    <p>x + y</p> Signup and view all the answers

    What is the significance of the rate constant (k) in a chemical reaction?

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

    What is the primary factor that determines the rate of a very fast or instantaneous reaction?

    <p>Ionic species involved in the reaction</p> Signup and view all the answers

    Which type of reaction is typically associated with a high activation energy?

    <p>Very slow reaction</p> Signup and view all the answers

    What is the significance of the rate constant in a chemical reaction?

    <p>It determines the rate of reaction at a given temperature</p> Signup and view all the answers

    What is the primary difference between moderate and very slow reactions?

    <p>The rate of reaction</p> Signup and view all the answers

    Which of the following is NOT a characteristic of very fast or instantaneous reactions?

    <p>They have a measurable rate</p> Signup and view all the answers

    What is the significance of the decomposition of H2O2 in chemical kinetics?

    <p>It is an example of a moderate reaction</p> Signup and view all the answers

    What is the relationship between the kinetic equation and the molar concentration of reactants, when all reactants are at the same concentration?

    <p>The kinetic equation is independent of the molar concentration of reactants.</p> Signup and view all the answers

    What is the graphical representation of the reaction order, when a plot of Vs t is a straight line?

    <p>First order reaction</p> Signup and view all the answers

    What is the overall order of the reaction Rate = k[A]2 [B] [C]0?

    <p>3</p> Signup and view all the answers

    What is the relationship between the rate of reaction and the concentration of B, when keeping the concentrations of A and C constant?

    <p>The rate of reaction is doubled when the concentration of B is doubled.</p> Signup and view all the answers

    What is the order of the reaction with respect to A, given the rate law expression Rate = k[A]2 [B] [C]0?

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

    What is the relationship between the rate of reaction and the concentration of C, when keeping the concentrations of A and B constant?

    <p>The rate of reaction is unaffected when the concentration of C is doubled.</p> Signup and view all the answers

    For a reaction to occur, what is the minimum energy requirement of the reactant molecules?

    <p>Threshold energy</p> Signup and view all the answers

    What is the relationship between the rate constant (k) and the activation energy (Ea)?

    <p>k is exponentially related to Ea</p> Signup and view all the answers

    What is the significance of the fraction of effective collisions (f) in the collision theory of reaction kinetics?

    <p>It represents the probability of a collision resulting in a reaction</p> Signup and view all the answers

    What is the relationship between the activation energy (Ea) and the enthalpy of reaction (ΔH) for an endothermic reaction?

    <p>Ea &lt; ΔH</p> Signup and view all the answers

    What is the role of the activated complex in a reaction mechanism?

    <p>It is the transition state with energy equal to the threshold energy</p> Signup and view all the answers

    What is the significance of the rate of reaction in chemical kinetics?

    <p>It is a measure of the speed at which the reactants are converted to products</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser