Chemical Reactions and Proximity
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Questions and Answers

What is the primary reason why increasing the concentration of reactants in a solution increases the rate of reaction?

  • It reduces the formation of intermediate compounds
  • It changes the binding sites of enzymes
  • It decreases the activation energy of the reaction
  • It increases the number of collisions between reactants (correct)
  • How do enzymes increase the rate of reaction?

  • By forming intermediate compounds with reactants
  • By increasing the activation energy of the reaction
  • By decreasing the concentration of reactants
  • By taking reactants out of dilute solution and holding them close to each other (correct)
  • What is the role of the catalyst in the intermediate formation theory of catalysis?

  • It decreases the rate of reaction
  • It increases the concentration of reactants
  • It forms intermediate compounds with reactants (correct)
  • It reduces the activation energy of the reaction
  • Why are intermediate compounds formed in the intermediate formation theory of catalysis?

    <p>To allow the catalyst to form bonds with reactants</p> Signup and view all the answers

    What is a characteristic of the intermediate compound formed in the intermediate formation theory of catalysis?

    <p>It is very unstable</p> Signup and view all the answers

    Why are reactions involving catalysts faster than uncatalyzed reactions?

    <p>Because they have lower activation energy</p> Signup and view all the answers

    What is the typical reaction scheme represented in the given equation?

    <p>Reaction of reactants X and Y</p> Signup and view all the answers

    What is the characteristic of heterogeneous catalysts?

    <p>The reactants and catalyst are in different phases</p> Signup and view all the answers

    What is the role of the substrate in industrial applications of heterogeneous catalysts?

    <p>To increase the effective surface area of the catalyst</p> Signup and view all the answers

    What is the process by which the reactants are adsorbed onto the surface of the catalyst?

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

    What is the characteristic of a good catalyst?

    <p>It binds moderately well to the reactants and products</p> Signup and view all the answers

    What is the term for the phenomenon where one of the products acts as a catalyst?

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

    Study Notes

    Factors Affecting Reaction Rates

    • Proximity of reactants increases reaction rates, as it increases the number of collisions between reactants
    • Enzymes work by binding reactants, increasing their effective concentration and leading to increased reaction rates

    The Intermediate Formation Theory of Catalysis

    • Catalysts form intermediate compounds with reactants, which then react to form products
    • Intermediate compounds are unstable and break down to release products and the original catalyst
    • This process is faster than the uncatalyzed reaction

    Reaction Scheme

    • X + C → XC (1)
    • XC + Y → XYC (2)
    • XYC → CZ (3)
    • CZ → C + Z (4)

    Heterogeneous Catalysis

    • Catalyst and reactants are in different phases (e.g., solid catalyst, liquid or gas reactants)
    • Catalyst is often supported on a substrate to increase surface area and stability
    • Reactants adsorb onto the catalyst surface, migrate, react, and then desorb as products

    Autocatalysis

    • One of the products acts as a catalyst, increasing the reaction rate over time
    • Examples include the oxidation of oxalic acid by acidified potassium permanganate and the reaction between nitric acid and copper

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    Description

    This quiz explores how proximity affects chemical reaction rates, including the role of enzymes and concentrations of reacting molecules.

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