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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. 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. Hard: ionic lattice is strong and rigid
  4. density is usually between that of the component metals; alloy remains malleable and ductile
  5. Alloy formation sometimes alters the chemistry such as the formation of a chemically inert oxide layer in stainless steel.
  6. Malleable and ductile: deforming the solid does not change the environment immediately surrounding each metal core

6 True/False questions

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

          

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

          

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

          

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

          

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