9.3.2 Mechanism of Catalysis

    Cards (32)

    • What is the role of a catalyst in catalysis?
      Speeds up reactions
    • A catalyst speeds up a chemical reaction by lowering the activation energy
    • Arrange the following phases of homogeneous and heterogeneous catalysts in increasing order of their interaction with reactants:
      1️⃣ Heterogeneous: Adsorption on solid surface
      2️⃣ Homogeneous: Intimate contact in liquid solution
    • Homogeneous catalysts are typically in the solid phase.
      False
    • Match the type of catalyst with its phase:
      Homogeneous catalyst ↔️ Liquid
      Heterogeneous catalyst ↔️ Solid
    • What does a catalyst form temporary bonds with to lower activation energy?
      Reactants
    • The catalyst works by lowering the activation energy
    • What is the first step in the mechanism of catalysis?
      Adsorption
    • Arrange the steps in the mechanism of catalysis in the correct order:
      1️⃣ Adsorption
      2️⃣ Reaction
      3️⃣ Desorption
    • Match the type of catalyst with its example:
      Homogeneous catalyst ↔️ Acid-base catalyst
      Heterogeneous catalyst ↔️ Metal surface
    • What is the primary function of a catalyst in terms of energy?
      Lower activation energy
    • What is the phase of a homogeneous catalyst?
      Liquid
    • What is the phase of a heterogeneous catalyst?
      Solid
    • Homogeneous catalysts are in the same phase as the reactants
    • Heterogeneous catalysts provide active sites on solid surfaces for reactions to occur.
    • Match the feature with the type of catalyst:
      Same phase as reactants ↔️ Homogeneous catalyst
      Different phase from reactants ↔️ Heterogeneous catalyst
    • Catalysts lower the activation energy (EaE_{a}), which in turn increases the reaction rate
    • There are two main types of catalysts: homogeneous and heterogeneous.
    • Match the type of catalyst with its definition:
      Homogeneous Catalysts ↔️ Present in the same phase as reactants
      Heterogeneous Catalysts ↔️ Exist in a different phase from reactants
    • How do catalysts enable more molecules to overcome the reaction barrier?
      By lowering EaE_{a}
    • Homogeneous catalysts are typically in the liquid phase, allowing for intimate interaction with reactants.
    • In what phase do heterogeneous catalysts typically exist?
      Solid
    • Match the feature with the correct type of catalyst:
      Homogeneous Catalyst ↔️ Same phase as reactants
      Heterogeneous Catalyst ↔️ Different phase from reactants
    • Homogeneous catalysts exist in the same phase as the reactants.
    • Heterogeneous catalysts are easier to separate from reaction mixtures than homogeneous catalysts.
    • What is an example of homogeneous catalysis?
      Acid-catalyzed ester hydrolysis
    • In the Haber-Bosch process, nitrogen and hydrogen react using iron as a catalyst.
    • Steps in the mechanism of catalysis:
      1️⃣ Adsorption of reactants on the catalyst surface
      2️⃣ Chemical transformation of reactants
      3️⃣ Desorption of products from the surface
    • What role does the iron catalyst play in the Haber-Bosch process?
      Lowers activation energy
    • Catalysts are consumed during the reaction.
      False
    • A larger surface area in heterogeneous catalysts increases the number of active sites.
    • Match the catalytic reaction with its catalyst:
      Homogeneous Catalysis ↔️ Sulfuric Acid
      Heterogeneous Catalysis ↔️ Platinum