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7 Written questions

6 Multiple choice questions

  1. Soluble: the charged ions interact with the dipoles on the water molecules.
  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. density is usually between that of the component metals; alloy remains malleable and ductile
  5. 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. formed between atoms of different radius, where the smaller atoms fill the interstitial spaces between the larger atoms

6 True/False questions

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

          

  2. 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.

          

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

          

  4. Identification of an ionic solidUnable to conduct electricity as a solid; soluble in water; aqueous solution conducts electricity

          

  5. 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

          

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