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7 Written questions

6 Multiple choice questions

  1. density is usually between that of the component metals; alloy remains malleable and ductile
  2. Hard: ionic lattice is strong and rigid
  3. Shiny, reflective, lustrous: because electrons move freely throughout the metal. Metals are shiny because of the very strong absorption of light by the delocalised bonding electrons.
  4. Alloy formation sometimes alters the chemistry such as the formation of a chemically inert oxide layer in stainless steel.
  5. Malleable and ductile: deforming the solid does not change the environment immediately surrounding each metal core
  6. 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.

6 True/False questions

  1. 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.

          

  2. 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

          

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

          

  4. Interstitial Alloy (properties)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

          

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

          

  6. Malleability and ductility of an ionic solidPoor: ionic lattices are rigid and once broken tend to cleave along an entire plane.