Rates of Reaction: MCQ2
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Questions and Answers

What is the purpose of manganese dioxide in the breakdown of hydrogen peroxide?

  • To act as a catalyst to speed up the reaction (correct)
  • To alter the particle size of the reactants
  • To decrease the temperature of the reaction
  • To increase the concentration of oxygen

    • What is the definition of a catalyst?

  • A substance that alters the rate of a chemical reaction and is chemically changed at the end of the reaction
  • A substance that alters the rate of a chemical reaction, but is chemically unchanged at the end of the reaction (correct)
  • A substance that slows down the rate of a chemical reaction
  • A substance that increases the activation energy of a reaction

    • What is the term for the minimum energy required for colliding particles to react?

  • Catalyst energy
  • Reaction rate
  • Particle energy
  • Activation energy (correct)

    • What type of catalysis involves a catalyst in a different physical phase to the reactants?

    <p>Heterogeneous catalysis</p> Signup and view all the answers

    What is the term for the rate at a particular point in time during a reaction?

    <p>Instantaneous rate</p> Signup and view all the answers

    What is the equation for the breakdown of hydrogen peroxide?

    <p>H2O2 → H2O + ½ O2</p> Signup and view all the answers

    What is the term for the change in concentration of any one reactant or product in unit time?

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

    What type of catalysis is involved in the intermediate formation theory?

    <p>Homogeneous catalysis</p> Signup and view all the answers

    What is the primary role of a catalyst in a chemical reaction?

    <p>To lower the activation energy of the reaction</p> Signup and view all the answers

    What is the term for a collision that results in product formation?

    <p>Effective collision</p> Signup and view all the answers

    What is the term for the accumulation of one substance at the surface of another?

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

    What is the term for substances that can block active sites on a catalyst, reducing its effectiveness?

    <p>Catalytic poisons</p> Signup and view all the answers

    How does the surface area of a catalyst affect the reaction rate?

    <p>A larger surface area increases the reaction rate</p> Signup and view all the answers

    What is the term for the energy barrier that must be overcome for a reaction to occur?

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

    What is the relationship between concentration and rate in a chemical reaction?

    <p>Concentration is directly proportional to rate</p> Signup and view all the answers

    What is the type of catalysis that occurs when the reactants are gases and the catalyst is a solid?

    <p>Heterogeneous catalysis</p> Signup and view all the answers

    What is the term for the rate of reaction found by drawing a tangent to the curve at a point?

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

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