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7 Written questions

6 Multiple choice questions

  1. Poor: ionic lattices are rigid and once broken tend to cleave along an entire plane.
  2. Malleable and ductile: deforming the solid does not change the environment immediately surrounding each metal core
  3. formed between atoms of comparable radius, where one atom substitutes for the other in the lattice
  4. 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.
  5. Very Low: due to the strong Coulombic interactions of positive and negative ions arranged in a regular three-dimensional array.
  6. Metallic mixtures

6 True/False questions

  1. Hardness of an ionic solidHard: ionic lattice is strong and rigid

          

  2. 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

          

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

          

  4. Water solubility of an ionic solidSoluble: the charged ions interact with the dipoles on the water molecules.

          

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

          

  6. Conductivity of alloysGood: alloys usually retain a sea of mobile electrons (delocalized covalent bonds) and so remain conducting (for both HEAT and ELECTRICITY)

          

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