Crystal Structures and Solid Materials Quiz
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Questions and Answers

What is a crystalline material?

  • A material with no atomic arrangement
  • A material with a periodic array of atoms over large distances (correct)
  • A material with a periodic array of atoms over short distances
  • A material with random atomic arrangement

    • How do pure and undeformed magnesium and beryllium behave compared to pure and undeformed gold and silver?

  • They have no difference in behavior due to their crystal structure
  • They are harder due to their crystal structure
  • They are more brittle due to their crystal structure (correct)
  • They are more ductile due to their crystal structure

    • What significant property differences exist between crystalline and noncrystalline materials?

  • Ductility and brittleness
  • Conductivity and insulation
  • Hardness and softness
  • Transparency and opacity (correct)

    • Under what conditions do metals, ceramic materials, and certain polymers form crystalline structures?

    <p>Normal solidification conditions</p> Signup and view all the answers

    What kind of bond exists in crystalline materials?

    <p>Each atom is bonded to its nearest-neighbor atoms</p> Signup and view all the answers

    What is the direct relationship between the properties of some materials and their crystal structures?

    <p>The properties are directly related to their crystal structures</p> Signup and view all the answers

    What is the term used to describe materials that do not have long-range atomic order?

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

    In the context of crystal structures, what does the term 'lattice' refer to?

    <p>A three-dimensional array of points coinciding with atom positions</p> Signup and view all the answers

    What term is used to describe the small repeat entities into which crystal structures are often subdivided?

    <p>Unit cells</p> Signup and view all the answers

    What is the basic structural unit or building block of the crystal structure?

    <p>Unit cell</p> Signup and view all the answers

    Which type of materials are discussed briefly at the end of the chapter due to their noncrystalline or amorphous nature?

    <p>Amorphous materials</p> Signup and view all the answers

    What does the atomic hard-sphere model consider atoms (or ions) to be?

    <p>Solid spheres having well-defined diameters</p> Signup and view all the answers

    In a crystal structure, what does the atomic order indicate about small groups of atoms?

    <p>They form a repetitive pattern</p> Signup and view all the answers

    What is chosen to represent the symmetry of a crystal structure?

    <p>Unit cell</p> Signup and view all the answers

    What type of arrangement is used to represent nearest-neighbor atoms in the atomic hard-sphere model?

    <p>'Spheres touching one another'</p> Signup and view all the answers

    What kind of entities are unit cells in the context of crystal structures?

    <p>'Small repeat entities'</p> Signup and view all the answers

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