Ionic Lattices, Superconductors and Semiconductors

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Anonymous
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191151
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Ionic Lattices, Superconductors and Semiconductors
Updated:
2013-01-02 11:53:17
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Chemistry
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Description:
Advanced Higher Chemistry - Unit One - Ionic Lattices, Superconductors and Semiconductors
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  1. What is a cation?
    A positively charged ion
  2. What is an anion?
    A negatively charged ion
  3. If ions are around the same size in an ionic lattice what type of structure will they likely form?
    The caesium chloride structure
  4. If one ion is much bigger than the other in an ionic lattice what type of structure will they likely form?
    The sodium chloride structure
  5. In the caesium chloride structure what is the ratio of caesium ions to chloride ions?
    1:8
  6. In the sodium chloride structure what is the ratio of sodium ions to chloride ions?
    1:6
  7. What coordination number does the caesium chloride structure have?
    8:8
  8. What coordination number does the sodium chloride number have?
    6:6
  9. What are superconductors?
    Superconductors are a special class of materials that have zero electrical resistance at temperatures near absolute zero
  10. Why is the application of superconduction at these temperatures impractical?
    As achieving temperatures near absolute zero is difficult and costly
  11. What are some of the future applications of superconductors?
    • Frictionless transport systems
    • Power transmission
    • MRI
    • Electronics
  12. What are semiconductors?
    A covalent element such as silicon or germanium which has a higher conductivity than that of a typical non-metal but a much lower conductivity than that of a metal is described as a semiconductor
  13. The electrical conductivity of semiconductors _______ with increasing temperature?
    increases
  14. The electrical conductivity of semiconductors increases on exposure to light.  This is known as the _______ effect?
    photovoltaic
  15. What is doping?
    The deliberate addition of impurities to improve conductivity
  16. What are the main current carriers in n-type semiconductors?
    Surplus electrons
  17. What are the main current carriers in p-type semiconductors?
    Positive holes

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