c15 using rescources

• rusting is the corrosion of iron
• for rusting to take place oxygen and water are required
• rust is orange brown colour
• rust's chemical name is Iron III oxide Fe(OH)3
• Iron III hydroxide is permeable to air and water so Iron continues to corrode under layer of rust
• preventing rusting

  • protective barrier (paint, plastic, tin, oil)
  • galvanising (zinc layer protects iron )
  • stainless steel (contains chromium to protect steel)
• metals are soft because all the layers of atoms can slide over each other
• alloys are a mixture of different metals
• different sized atoms are mixed with metals to make it harder since the layers can't slide over each other as easily
• making metals harder is the main point of alloying
• alloying can be used to give metals additional qualities like resistance to corrosion
• bronze

  • COMPOSITION: copper + tin
  • USE: sculptures, boats
• brass

  • COMPOSITION: copper + zinc
  • USE: instruments, coins
• carbon steel

  • COMPOSITION: iron + carbon
  • USE: building materials, tools, cars
• stainless steel

  • COMPOSITION: iron + nickel + chromium
  • USE: cookware, reaction vessels
• aluminium alloys

  • COMPOSITION: aluminium + copper (over 100+ combinations)
  • USE: planes, armour plating on tanks
• amalgam

  • COMPOSITION: mercury + silver
  • USE: dentistry - fillings
• solder

  • COMPOSITION: lead + antimony
  • USE: joining electrical wires
• gold alloy

  • COMPOSITION: gold + copper
  • USE: jewellery