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7 Written questions

6 Multiple choice questions

  1. Good: electrons are delocalized and relatively free to move
  2. 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.
  3. Good: alloys usually retain a sea of mobile electrons (delocalized covalent bonds) and so remain conducting (for both HEAT and ELECTRICITY)
  4. 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.
  5. Malleable and ductile: deforming the solid does not change the environment immediately surrounding each metal core
  6. Non-conductive (insulators): ions are pinned by the rigid lattice.

6 True/False questions

  1. Substitutional Alloy (properties)density is usually between that of the component metals; alloy remains malleable and ductile

          

  2. Identification of an ionic solidNon-conductive (insulators): ions are pinned by the rigid lattice.

          

  3. Brittleness of an ionic solidBrittle: due to the repulsion of like charges caused when one layer slides across another layer.

          

  4. 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.

          

  5. Interstitial Alloy (definition)interstitial atoms do not appreciably expand the lattice and so density is often substantially increased; interstitial atoms make the lattice more rigid reducing ductility and malleability

          

  6. Water solubility of an ionic solidInsoluble: 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.