Properties of Colloidal Dispersions: Brownian Motion
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Questions and Answers

How does an increase in temperature affect Brownian motion in colloidal dispersions?

  • Has no effect on Brownian motion
  • Increases the Brownian motion of dispersed-phase particles (correct)
  • Reduces the velocity of the particles
  • Decreases the rate of diffusion

    • What is the function of Brownian motion in colloidal dispersions?

  • Contributing to the diffusion from a region of higher concentration to one of lower concentration
  • Regulating the rate of diffusion as per Fick’s first law
  • Causing colloidal particles to pursue an irregular and complicated zigzag path (correct)
  • Increasing the viscosity of the medium

    • What is the effect of decreasing particle size on the velocity of colloidal particles?

  • The velocity varies randomly
  • The velocity of the particles decreases
  • The velocity of the particles increases (correct)
  • The velocity remains constant

    • How does increasing the viscosity of the medium affect Brownian movement in colloidal dispersions?

    <p>It decreases Brownian movement due to greater resistance to movement of the dispersed-phase particles</p> Signup and view all the answers

    What does Fick’s first law express in relation to diffusion in colloidal dispersions?

    <p>The rate of diffusion, expressed by J = dm/ A.dt = – D dC/dx</p> Signup and view all the answers

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