Colloid Dispersion and Sedimentation Quiz
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Questions and Answers

What is the formula for the velocity of sedimentation of spherical particles according to Stoke's law?

  • V = 2r^2g(ρ - ρo) / 9ηo (correct)
  • V = 2rg(ρ - ρo) / 9ηo
  • V = r^2g(ρ - ρo) / 9ηo
  • V = r^2g(ρ - ρo) / 6ηo
  • What tends to offset the sedimentation of colloidal particles?

  • Electrostatic repulsion
  • Molecular weight
  • Brownian movement (correct)
  • Centrifugal force
  • What force must be applied to cause sedimentation of colloidal particles?

  • Ultracentrifugation (correct)
  • Gravity
  • Hydrodynamic force
  • Electrostatic force
  • In an ultracentrifuge, how do the particles settle?

    <p>According to their molecular weight</p> Signup and view all the answers

    What is osmosis?

    <p>The migration of solvent molecules through a semipermeable membrane</p> Signup and view all the answers

    Ultracentrifugation is a weaker force compared to gravity in causing sedimentation of colloidal particles.

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

    In normal dispersions, the dispersed particles do not tend to settle under the influence of gravity.

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

    The Brownian movement tends to offset the sedimentation of colloidal particles.

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

    Osmosis is the migration of particles from a region of higher concentration to a region of lower concentration.

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

    In an ultracentrifuge, the particles settle according to their size.

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

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