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5 Written questions

5 Matching questions

  1. unit cell
  2. Si (structure)
  3. polymorphs
  4. Kr
  5. Graphite (structure)
  1. a group 18 solid (aka atomic solid)
  2. b The smallest building block of a crystal, consisting of atoms, ions, or molecules, whose geometric arrangement defines a crystal's characteristic symmetry and whose repetition in space produces a crystal lattice.
  3. c
    tetrahedral network
  4. d different forms of crystal structure for the same solid material
  5. e
    Graphenes (layers) are weakly held together by LDFs. As far as LDFs go they are strong because graphene layers are flat and large.

5 Multiple choice questions

  1. Network solid (3-D)

  2. tetrahedral network
  3. layered, planar; can be described as a 2-dimensional lattice because covalent bonds occur only within sheets (planes) called graphenes; in each layer C atoms are arranged in a honeycomb-like lattice
  4. molecular solid

5 True/False questions

  1. U (type)Network solid (3-D)


  2. Si (unit cell)


  3. α-quartz
    Formed from α-quartz at 846K.


  4. Fe (type)metallic solid


  5. Graphite (unit cell)2-D network solid