Colloids

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Questions and Answers

Which of the following best describes a colloid?

  • A mixture that settles down when left undisturbed
  • A mixture that can be separated by filtration
  • A mixture with particles too small to be seen (correct)
  • A homogeneous mixture

Which technique can be used to separate colloidal particles?

  • Centrifugation (correct)
  • Distillation
  • Evaporation
  • Filtration

What happens to a beam of light passing through a colloid?

  • It becomes invisible
  • It gets absorbed by the particles
  • It scatters and becomes visible (correct)
  • It passes through without any change

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Study Notes

Colloids

  • A colloid is a mixture in which one substance consists of microscopically dispersed insoluble particles that are distributed throughout another substance.
  • The particles in a colloid are larger than those in a solution, but smaller than those in a suspension.

Separating Colloidal Particles

  • Centrifugation is a technique used to separate colloidal particles from a mixture.

Light Scattering in Colloids

  • When a beam of light passes through a colloid, it scatters in all directions due to thepresence of dispersed particles, a phenomenon known as Tyndall effect.

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