Characterization of Crystalline Materials: Melting Point and Heat of Fusion Quiz
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Questions and Answers

What is the main difference between amorphous substances and crystals other than cubic?

  • Amorphous substances have higher refractive index than non-cubic crystals.
  • Amorphous substances are isotropic while non-cubic crystals are anisotropic. (correct)
  • Amorphous substances have lower melting points than non-cubic crystals.
  • Amorphous substances exhibit different properties in various directions while non-cubic crystals do not.
  • What happens to beeswax and paraffin when heated then cooled slowly?

  • They remain amorphous.
  • They become liquid.
  • They assume crystalline arrangements. (correct)
  • Their refractive index changes.
  • How does the polymorphic form of Novobiocin affect its therapeutic activity?

  • The amorphous form is poorly absorbed but therapeutically active. (correct)
  • The amorphous form is poorly absorbed and has no activity.
  • Both forms have similar therapeutic effects.
  • The crystalline form is more readily absorbed and therapeutically active.
  • What constitutes the liquid crystalline state or mesophase?

    <p>Intermediate between the liquid and solid states.</p> Signup and view all the answers

    Which state allows molecules to be mobile in three axes perpendicular to each other?

    <p>Liquid state</p> Signup and view all the answers

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