IGCSE›Cambridge IGCSE Chemistry›Mind mapsUses of MetalsCambridge IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsChoosing metalsChosen for their physical propertiesKey: density, conductivity, corrosion resistance, ductilityLink property to use, do not just listAircraftAluminium has a low densityLight, so less fuel neededSteel is stronger but far denserOverhead cablesAluminium: low density and good conductivityLight cables put less stress on pylonsCopper conducts better but is denser, dearerMetal usesproperty to purposeAlCuFood containersAluminium is corrosion resistantProtective oxide layer stops further attackIron cans rust and flake into foodCopper wiringExcellent electrical conductivityHighly ductile: drawn into wiresOnly silver conducts better, but it is too dearExam tipsAircraft answer is low density, not strengthCables and wiring need both propertiesNever list a property without the reason