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7 Written questions

6 Multiple choice questions

  1. Unable to conduct electricity as a solid; soluble in water; aqueous solution conducts electricity
  2. Insoluble: ionic compounds tend not to dissolve in nonpolar solvents because the attractions between ions are much more favorable than the attractions among the separated ions and nonpolar solvent molecules.
  3. Very Low: due to the strong Coulombic interactions of positive and negative ions arranged in a regular three-dimensional array.
  4. Poor: ionic lattices are rigid and once broken tend to cleave along an entire plane.
  5. Brittle: due to the repulsion of like charges caused when one layer slides across another layer.
  6. Non-conductive (insulators): ions are pinned by the rigid lattice.

6 True/False questions

  1. Substitutional Alloy (properties)formed between atoms of comparable radius, where one atom substitutes for the other in the lattice


  2. Interstitial Alloy (properties)formed between atoms of different radius, where the smaller atoms fill the interstitial spaces between the larger atoms


  3. Conductivity of alloysNon-conductive (insulators): ions are pinned by the rigid lattice.


  4. Conductivity of a metallic solidGood: electrons are delocalized and relatively free to move


  5. Optical properties of metals (list and reason)When light falls on a metal it is almost totally absorbed since the bonding electrons can jump up to a broad band of energy levels allowing energy changes corresponding to the full range of frequencies in the visible region of the spectrum.

    These currents immediately re-emit the light out of the metal thus providing a strong reflection if the metal surface is smooth.


  6. AlloysMetallic mixtures


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