5.5 explain the uses of aluminium and iron, in terms of their properties

5.5 •aluminium 

      

use	most important property
•aeroplane bodies	•high strength-to-weight ratio
•saucepans	•good conductor of heat
•overhead power cables	•good conductor of electricity
•food cans	•non-toxic
•window frames	•resists corrosion

      •iron  

use	most important property
•car bodies	•strong (wishstands collisions)
•iron nails	•strong
•ships	•strong
•girders	•strong
•bridges	•strong

      •aluminium alloys are stronger so are often used instead

      •pure iron is soft and so corrodes easily

                    •cast iron is brittle and is used for cooking pans

      •aluminium oxide sticks to the metal, preventing any further reactions

      •it is much less dense than air