Factors Affecting Rate of Diffusion
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Questions and Answers

Which factor has the greatest effect on the rate of diffusion?

  • Surface area of the membrane
  • Temperature
  • Mass of the diffusing molecules
  • Concentration gradient (correct)

    • How does temperature affect the rate of diffusion?

  • Higher temperature decreases the rate of diffusion
  • Higher temperature increases the kinetic energy of particles, increasing the rate of diffusion (correct)
  • Temperature has no effect on the rate of diffusion
  • Higher temperature increases the mass of the diffusing molecules, decreasing the rate of diffusion

    • Which of the following states of matter has the fastest rate of diffusion?

  • Liquid
  • Solid
  • All states of matter have the same rate of diffusion
  • Gas (correct)

    • How does the mass of diffusing molecules affect the rate of diffusion?

    <p>Heavier molecules diffuse slower due to higher inertia</p> Signup and view all the answers

    How does the distance a substance must travel affect the rate of diffusion?

    <p>The greater the distance, the slower the rate of diffusion</p> Signup and view all the answers

    How does increasing the surface area of a membrane affect the rate of diffusion?

    <p>Increasing the surface area increases the rate of diffusion</p> Signup and view all the answers

    What is the role of microvilli in absorption in the small intestine?

    <p>Increase surface area for diffusion</p> Signup and view all the answers

    Why is diffusion considered a relatively slow process?

    <p>Continuous collisions among diffusing particles</p> Signup and view all the answers

    What happens to diffusion when the concentration of a substance is equal in two areas?

    <p>It stops</p> Signup and view all the answers

    Why do cells increase surface area for diffusion using microvilli?

    <p>To facilitate rapid absorption</p> Signup and view all the answers

    What is the impact of temperature on the rate of diffusion?

    <p>Higher temperature increases diffusion rate</p> Signup and view all the answers

    How do cells in the kidney or intestinal wall increase the rate of absorption through diffusion?

    <p>By forming microvilli to increase surface area</p> Signup and view all the answers

    What is the main function of a cell membrane?

    <p>Regulation of substances entering and leaving the cell</p> Signup and view all the answers

    Which type of transport moves substances from an area of high concentration to an area of low concentration without using cellular energy?

    <p>Passive transport</p> Signup and view all the answers

    What drives diffusion in cells?

    <p>Random movements of particles due to kinetic energy</p> Signup and view all the answers

    How does concentration gradient affect the rate of diffusion?

    <p>Higher concentration gradient leads to faster diffusion</p> Signup and view all the answers

    What role does surface area play in the rate of diffusion?

    <p>Surface area directly affects the rate of diffusion</p> Signup and view all the answers

    How does temperature affect the rate of diffusion in cells?

    <p>Higher temperature increases the rate of diffusion</p> Signup and view all the answers

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