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5 Written questions

5 Matching questions

  1. 3 forms of C (carbon)
  2. Si (unit cell)
  3. Diamond (type)
  4. U (type)
  5. Si (structure)
  1. a
  2. b Network solid (3-D)
  3. c metallic solid
  4. d graphite (2-D network solid)
    diamond (3-D network solid)
    coke (highly carbonaceous amorphic solid)
  5. e
    tetrahedral network

5 Multiple choice questions

  1. Silicon dioxide, (aka) silica, (most commonly found in nature as) quartz
  2. 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
  3. different forms of crystal structure for the same solid material
  4. a regular, repeating array of atoms or ions

5 True/False questions

  1. allotropesdifferent structural modifications of an element; bonding is different


  2. Si (type)metallic solid


  3. unit cell


  4. SiC (type)Network solid (3-D)


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


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