Basic Crystal Structures Quiz
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Questions and Answers

What term describes the regular repeating three-dimensional structure formed by the constituents of a solid?

  • Regular array
  • Crystal lattice (correct)
  • Uniform arrangement
  • Amorphous lattice
  • What is the defining feature of crystalline solids?

  • Regular ordered arrays (correct)
  • Irregular atomic positions
  • Inconsistent intermolecular forces
  • Amorphous arrangement
  • What characteristic distinguishes crystalline solids when exposed to x-rays?

  • Random pattern
  • Distinctive internal structures (correct)
  • Shapeless faces
  • Inconsistent angles
  • What does the term 'amorphous' mean in the context of solids?

    <p>Shapeless (A)</p> Signup and view all the answers

    In crystalline solids, what are the positions of the atoms, molecules, or ions considered to be?

    <p>Essentially fixed in space (B)</p> Signup and view all the answers

    What do the characteristic angles produced by crystalline structures depend on?

    <p>Regular repeating arrangement of atoms, molecules, or ions (C)</p> Signup and view all the answers

    What characteristic property distinguishes amorphous solids from crystalline solids?

    <p>They have poorly defined patterns under x-rays (C)</p> Signup and view all the answers

    Why do amorphous solids tend to have irregular, often curved surfaces when cleaved or broken?

    <p>As a result of impurities that disrupt the lattice (B)</p> Signup and view all the answers

    What determines the angles at which the faces of a covalent solid such as a cut diamond meet?

    <p>The arrangement of carbon atoms in the crystal (C)</p> Signup and view all the answers

    Why do ionic crystals break along fixed planes when cleaved?

    <p>Because of the repulsive interactions during cleavage (B)</p> Signup and view all the answers

    What characteristic property allows crystalline solids to have sharp, well-defined melting points?

    <p>The regularity of the crystalline lattice (B)</p> Signup and view all the answers

    What type of solid is characterized by having a highly ordered arrangement of silicon and oxygen atoms?

    <p>Crystalline quartz (C)</p> Signup and view all the answers

    What determines the local environments in a crystalline lattice to be the same?

    <p>The same distance from the same number and type of neighbors (D)</p> Signup and view all the answers

    What causes some substances to solidify in amorphous form when the liquid phase is cooled rapidly enough?

    <p>Rapid cooling of the liquid phase (C)</p> Signup and view all the answers

    What determines whether a substance forms amorphous or crystalline structure when solidifying?

    <p>The cooling rate of the liquid phase (A)</p> Signup and view all the answers

    Why does amorphous aluminum form only when cooled at an extraordinary rate?

    <p>The rapid cooling rate preventing regular array formation (C)</p> Signup and view all the answers

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