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    For the advantage of ethene and steam can I say that it produces pure ethene so less is needed to be produced?
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    Thank you this has given me confidence in what i have out + ScienceFanatic
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    (Original post by srmed)
    Was the two conditions for cracking: high temperature and hot catalyst


    Posted from TSR Mobile
    it was pressure not catalyst
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    It wasn't Boron it was Neon when explaining what was wrong with the structure. It had 9 electrons, Neon has 7
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    I said for the two conditions for cracking as:

    mixed with steam
    high temps

    Would I get 2 marks?
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    (Original post by Zeeyo)
    it was pressure not catalyst
    It was not pressure, it was high temperature and hot catalyst.
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    (Original post by AshWellz)
    Is this definitely right? I thought potassium would be easier to thermally decompose as its more reactive. I put it didn't thermally decompose because it was more reactive than oxygen so it couldn't be displaced...
    In the results table, potassium didn't even lose mass (or something) so I thought that meant it didn't thermally decompose as easily...
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    (Original post by romansholiday)
    I said for the two conditions for cracking as:

    mixed with steam
    high temps

    Would I get 2 marks?
    Catalyst need to be one of them i think...You'll get the mark for temp. though.
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    (Original post by Ads.m)
    Catalyst need to be one of them i think...You'll get the mark for temp. though.
    no you got it wrong
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    Guyzz
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    (Original post by romansholiday)
    In the results table, potassium didn't even lose mass (or something) so I thought that meant it didn't thermally decompose as easily...
    Thats absolutely correct! It didn't decompose as easily as it need a higher temperature to decompose it. It did mention in the spec that potassium was one of the metals that did not decompose with a Bunsen burner, it need something with a higher temperature.
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    I think i got around 43-45, would this maybe be an A
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    For the reactivity one I put any below potassium and calcium can be easily decomposed, as it asked which one could be decomposed easily?
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    (Original post by Zeeyo)
    no you got it wrong
    Quite sure pressure has nothing to do with it smart guy.
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    What would the grade boundaries be like?
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    (Original post by Ads.m)
    Catalyst need to be one of them i think...You'll get the mark for temp. though.


    On the spec it says catalyst or mixed with steam, I'll ask my teacher tomorrow..
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    2Fe2O3+ 3C = 4Fe+ 3CO2( 2 marks)

    I think the right answer is 2Fe2O3 + 3C = 2Fe2 + 3CO2
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    (Original post by romansholiday)


    On the spec it says catalyst or mixed with steam, I'll ask my teacher tomorrow..
    It asked for two conditions. Mixing the hydrocarbon with steam at a very high temperature was one of the methods and passing the vapours over a hot catalyst was the other method.

    Two things in bold were the conditions.
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    (Original post by Ads.m)
    Thats absolutely correct! It didn't decompose as easily as it need a higher temperature to decompose it. It did mention in the spec that potassium was one of the metals that did not decompose with a Bunsen burner, it need something with a higher temperature.
    Yassss, this exam went really well for me, considering I crammed the night before, just little details I've missed out on the six marker and few other questions
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    Wouldn't it be smelting instead of thermal decomposition?
 
 
 
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