Metals

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  • Created by: beth
  • Created on: 31-12-12 15:32
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  • METALS
    • RECYCLING
      • ADVANTAGES
        • Only uses a SMALL FRACTION of the ENERGY needed to mine/ extract a new metal
        • SAVES MONEY
        • REDUCES LANDFILL
      • DISADVANTAGES
        • MINING and EXTRACTING takes a lot of ENERGY
        • FOSSIL SUELS are running out so its important to CONSERVE them
        • Burning fossil fuels comtributes to ACID RAIN, GLOBAL DIMMING and CLIMATE CHANGE
    • PROPERTIES OF METALS
      • TRANSITION METALS are GOOD CONDUCTORS of HEAT  and ELECTRICITY. They can also be BENT/ HAMMERED into shape. They are useful as STRUCTUAL MATERIALS
      • COPPER
        • Good CONDUCTOR of ELECTRICITY
        • HARD and STRONG but can be BENT
        • DOESN'T REACT with WATER
      • ALUMINIUM
        • CORROSION RESISTANT
        • LOW DENSITY metal
        • PURE aluminium ISN'T strong but forms HARD, STRONG ALLOYS
      • TITANIUM
        • CORROSION RESISTANT
        • LOW DENSITY metal
        • Very STRONG
    • ALLOYS
      • A mixture of two or more ELEMENTS where at least one METAL is an ALLOY
      • ALLOYS are used because PURE ELEMENTS aren't always right for certain jobs
      • IRON from a BLAST FURNACE is around 96% IRON and 4% IMPURITIES (i.e. CARBON
        • Because the ARRANGEMENT of the iron ATOMS is REGULAR, the slide over each other, making the iron SOFT and EASILT SHAPED. This is TOO BENDY for most uses
      • Iron is changed into STEEL ( an ALLOY), which is formed by adding small amounts of CARBON (and sometimes other metals) to the iron
      • STEEL
        • Low carbon steel (0.1% carbon) - Easily shaped- used for car bodies
        • High carbon steel (1.5%carbon)- Very hard, inflexible- Used for blades/ bridges
        • Stainless Steel (Chromium and Nickel)- Corrosion resistant- used for cutlery/ sinks

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