7. J04/3/5. (a) Copper has the structure of a typical
metal. It has a lattice of positive
ions and a “sea” of mobile electrons. The lattice can accommodate ions of a different metal.
–Give a different use of copper that depends on each of
the following.
–(i) the ability of the ions in the lattice to move past
each other [1]
–
–(ii) the presence of mobile electrons [1]
–
–(iii) the ability to accommodate ions of a different
metal in the lattice [1]
8. N03/3/3 (b) A major use of zinc is to make diecasting
alloys. These contain about 4% of
aluminium and they are stronger and less malleable than pure zinc.
–(i) Give one other large scale use of zinc. [1]