IB Chemistry SL

Revision Notes

4.1.17 Alloys & their Properties

Alloys

  • Alloys are mixtures of metals, where the metals are mixed together physically but are not chemically combined
  • They can also be made from metals mixed with nonmetals such as carbon
  • Ions of the different metals are spread throughout the lattice and are bound together by the delocalized electrons
  • It is possible to form alloys because of the non-directional nature of the metallic bonds

Particle diagram – mixture of elements in alloy, IGCSE & GCSE Chemistry revision notes

In a metallic lattice the regular structure of metal cations (shown by Element Y) is disrupted by the presence of another element (Element X)

  • Alloys have distinct properties due to the different packing of the cations in the lattice
  • Alloys often have properties that can be very different to the metals they contain, for example they can have greater strength, hardness or resistance to corrosion or extreme temperatures
  • Alloys contain atoms of different sizes, which distorts the regular arrangements of cations
  • This makes it more difficult for the layers to slide over each other, so they are usually much harder than the pure metal
  • Below is a table of some common alloys and their uses:

Common alloys and their uses table

Common alloys and their uses, downloadable IB Chemistry revision notes

Exam Tip

You don’t need to learn the specific alloys, but you should be able to use examples you know to explain why alloys have the properties they do compared to pure metals

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