Rates of Reaction : MCQ3
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Questions and Answers

What is the characteristic of the catalyst in surface adsorption theory?

  • It can be either a solid, liquid, or gas
  • It is always a gas
  • It is always a liquid
  • It is always a solid (correct)

    • What is the effect of an increase in temperature of 10K on the number of collisions?

  • A small increase of 50% (correct)
  • A significant increase of 100%
  • No change
  • A decrease of 20%

    • What is the effect of catalytic poisons on the reaction rate?

  • They increase the reaction rate by blocking inactive sites
  • They increase the reaction rate by increasing the activation energy
  • They have no effect on the reaction rate
  • They decrease the reaction rate by blocking active sites (correct)

    • What is the relationship between concentration and rate of reaction?

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

    What is the graphical method to determine the instantaneous rate of reaction?

    <p>By drawing a tangent to the curve at the point</p> Signup and view all the answers

    What is the characteristic of the reaction if ∆H is negative?

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

    What is the effect of increasing the surface area of the catalyst?

    <p>It increases the reaction rate due to more available catalytic sites</p> Signup and view all the answers

    What is the term used to describe the accumulation of one substance at the surface of another?

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

    What is the primary function of manganese dioxide in the decomposition of hydrogen peroxide?

    <p>To act as a catalyst to speed up the reaction</p> Signup and view all the answers

    What is the term for the minimum energy required for colliding particles to result in a reaction?

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

    Which of the following is an example of heterogeneous catalysis?

    <p>Manganese dioxide in the decomposition of hydrogen peroxide</p> Signup and view all the answers

    What is the rate of reaction measured in terms of?

    <p>Change in concentration of products over time</p> Signup and view all the answers

    What is the term for a product of a reaction that becomes a catalyst for the same reaction?

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

    Which of the following is NOT a factor affecting the rate of reaction?

    <p>Color of the reactants</p> Signup and view all the answers

    What is the term for the theory that involves homogeneous catalysis?

    <p>Intermediate formation theory</p> Signup and view all the answers

    What is the definition of a catalyst?

    <p>A substance that alters the rate of a chemical reaction, but is chemically unchanged at the end of the reaction</p> Signup and view all the answers

    What is the term for a collision that results in a reaction?

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

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