Association Colloids: Micelles and the CMC Quiz
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Questions and Answers

In the case of amphiphiles in water, how do the molecules orient themselves in a micelle?

  • Hydrocarbon chains face outward
  • Hydrocarbon chains face inward (correct)
  • Both hydrocarbon chains and polar heads face outward
  • Polar heads face inward
  • What is the term used for the ions attracted to the surface of a micelle that reduce the overall negative charge?

  • Pro-ions
  • Counterions (correct)
  • Parallel ions
  • Anti-ions
  • At higher concentrations, what type of micelles have an increasing tendency to form?

  • Cylindrical micelles
  • Laminar micelles (correct)
  • Reverse micelles
  • Spherical micelles
  • Which type of amphiphile is represented by Cetyl trimethylammonium bromide?

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

    In non-polar liquids, how do amphiphile molecules orient themselves in a micelle?

    <p>Polar heads face inward</p> Signup and view all the answers

    What do we call mixtures of two or more amphiphiles in pharmaceutical formulations?

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

    What are association colloids also known as?

    <p>Amphiphilic colloids</p> Signup and view all the answers

    What happens when the concentration of amphiphiles is increased?

    <p>They aggregate to form micelles</p> Signup and view all the answers

    What is the critical micelle concentration (CMC)?

    <p>The concentration at which monomers aggregate to form micelles</p> Signup and view all the answers

    What is the aggregation number of a micelle?

    <p>The number of monomers that aggregate to form a micelle</p> Signup and view all the answers

    At what point does micelle formation occur in the bulk phase?

    <p>Above the CMC</p> Signup and view all the answers

    How does the formation of association colloids compare to lyophilic sols?

    <p>It is a spontaneous process, like lyophilic sols</p> Signup and view all the answers

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