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    • Thread Starter

    [FONT=Comic Sans MS]I think its a good idea if we use this thread to post past paper difficulties we've bee having.

    I'll start off--2004 Paper there is a question about the name of the addition polymer of 'tetrafluroethene'? any luck?

    and also the question on Steel Manufacture? :rolleyes:

    Polytetrafluoroethene i.e. Teflon
    • Thread Starter

    (Original post by Narin)
    Polytetrafluoroethene i.e. Teflon

    (Original post by Divine89)
    and also the question on Steel Manufacture? :rolleyes:
    Oo, *tries to recall* it's a 9 step process if I remember:

    1) Pour molten iron into converter
    2) Add scrap iron to reduce thermal shock
    3) Non metal impurities converted to non metal oxides by passing oxygen through
    4) These are examples of redox reactions ^^
    5) Carbon oxidised to carbon dioxide and comes off as a gas
    6) Other non metals (mainly silicon) form oxides
    7) These oxides are acidic and removed by neutralising them with limestone
    8) **** is produced which floats on top and can be removed
    9) Other elements then added to iron to produce steel alloys
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