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7 Written questions

6 Multiple choice questions

  1. 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.
  2. formed between atoms of comparable radius, where one atom substitutes for the other in the lattice
  3. Alloy formation sometimes alters the chemistry such as the formation of a chemically inert oxide layer in stainless steel.
  4. 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. formed between atoms of different radius, where the smaller atoms fill the interstitial spaces between the larger atoms
  6. 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.

6 True/False questions

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


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


  3. Vapor pressure an of ionic solidHard: ionic lattice is strong and rigid


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


  5. Conductivity of a metallic solidNon-conductive (insulators): ions are pinned by the rigid lattice.


  6. Malleability and ductility of a metallic solidMalleable and ductile: deforming the solid does not change the environment immediately surrounding each metal core


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