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5 Written Questions

5 Matching Questions

  1. polymorphs
  2. Pb (type)
  3. unit cell
  4. Silica (description of structure)
  5. Si (unit cell)
  1. a
  2. b metallic solid
  3. c has more polymorphs than almost any other structure
  4. d 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.
  5. e different forms of crystal structure for the same solid material

5 Multiple Choice Questions

  1. Graphenes (layers) are weakly held together by LDFs. As far as LDFs go they are strong because graphene layers are flat and large.
  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. tetrahedral network
  4. molecular solid
  5. different structural modifications of an element; bonding is different

5 True/False Questions

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


  2. SiO₂ (type)molecular solid


  3. Graphite (type)2-D network solid


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


  5. Si (type)metallic solid


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