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5 Written questions

4 Matching questions

  1. Si (unit cell)
  2. Graphite (unit cell)
  3. SiO₂ (type)
  4. NH₃ (type)
  1. a Network Solid (3-D)
  2. b
  3. c molecular solid
  4. d

5 Multiple choice questions

  1. metallic solid
  2. Network solid (3-D)
  3. 2-D network solid
  4. 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
  5. different structural modifications of an element; bonding is different

5 True/False questions

  1. coke (type)amorphous solid


  2. SiC (structure)
    tetrahedral network


  3. Diamond (structure)
    tetrahedral network


  4. NaCl (structure)


  5. Graphite (structure)
    Graphenes (layers) are weakly held together by LDFs. As far as LDFs go they are strong because graphene layers are flat and large.