metal

• stainless steel


  nickel, chromium, carbon, iron
• chemical name rust


  hydrated iron(iii) oxide
• sacrificial

  • zinc more reactive
  • corrode/rust instead of iron
• brass


  cu, zinc
• alloy

  mixture of metal with other element

  alloy diff sized atom -> irregular structure -> not malleable (layers can't slide)

  • harder, stronger useful
• uses of metals

  stainless steel - hard + corrosion res -> cutlery

  aluminium - low density - aircraft

  corrode res -> food container

  E conduct, low density -> overhead cable

  • Copper - E conduct, ductile -> electrical wire