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    Unofficial mark scheme??
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    (Original post by Palette)
    I got bile question wrong... for pH decrease I wrote bile neutralises the milk (since milk is slightly acidic) instead of writing bile neutralises fatty acids.

    I got 400 magnification too.

    705+224= 929.

    705/929= 0.7588--> 0.76
    224/929= 0.2411---> 0.24

    0.76:0.24= 19:6

    I think I was the only person in the entire country to get that answer. There'll be a wide margin of error (whatever you call it) due to rounding issues.
    I think I rambled on about something to neutralisation but then realised the pH was actually getting lower whereas if it was neutralising it, it would get higher. So i said pH got lower because fatty acids were produced and they are acidic... I don't even know haha!

    Wow didn't think about doing that- just put 705 and 224 in a fraction which didn't simplify so got confused and rounded to 3:1. 19:6 sounds good and i suppose 3:1 is close to the simplified ratio of that, if it had been 18:6..
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    what did everyone get for the first question on c2 about reaction rates
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    well I think I flopped
    I mean some questions were alright to answer but the rest I just my mind went all blank and don't even get me stated on C2! But hopefully the grade boundaries are low this year
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    (Original post by Hannzz98)
    What did everyone put for the ions test?


    Posted from TSR Mobile
    Iron (II) Sulphate
    Sodium Iodide
    Iron (III) Bromide
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    (Original post by Bubblebex1)
    So did I because before electrolysis aluminium oxide is separated from its ore "bauxite" so in electrolysis the solution is aluminium oxide
    you may not get a mark for that either, i think they wanted "alumina"
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    I put iron2+ sulfate

    Sodium+chloride-

    FE3++H2SO43-
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    (Original post by souless_lol)
    well I think I flopped
    I mean some questions were alright to answer but the rest I just my mind went all blank and don't even get me stated on C2! But hopefully the grade boundaries are low this year
    I think the denizens of TSR are generally of the upper ability, so as I said before, equilibrium should be nearly reached by the counteracting effect of the lower ability people on the grade boundaries.
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    (Original post by bananabrain12345)
    for the cryolite I put bauxite but it is aluminium oxide according to the revision guide
    some say bauxite some say aluminium oxide some say alumina , they could allow all
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    for the first question on c3 were they asking for the actual names of the elements of the symbols?
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    I am hoping for 1 mark on that question
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    For the ions question did we have to put the actual ion symbol eg fe2+ or could we write iron
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    (Original post by Amy Hickman)
    For improvements to the experiment i put stir it ?? Is that acceptable or?
    :c yep thats 2/2
    although if you stir none it is still a fair comparison between concentrations
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    Elements
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    (Original post by Terrydaktal)
    some say bauxite some say aluminium oxide some say alumina , they could allow all
    Wikipedia says aluminium oxide (alumina) in molten cryolite, but I think people are taught to remember that name the ore of aluminium is bauxite, so yes, they'll accept all three, otherwise I'll make them accept all three
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    How did you guys find the exams today ?????
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    (Original post by RotomGuy)
    Iron (II) Sulphate
    Sodium Iodide
    Iron (III) Bromide
    I think I got that! 😊


    Posted from TSR Mobile
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    Do you guys know if there's a thread for next weeks physics exams?


    Posted from TSR Mobile
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    (Original post by Nomes24)
    I think I rambled on about something to neutralisation but then realised the pH was actually getting lower whereas if it was neutralising it, it would get higher. So i said pH got lower because fatty acids were produced and they are acidic... I don't even know haha!

    Wow didn't think about doing that- just put 705 and 224 in a fraction which didn't simplify so got confused and rounded to 3:1. 19:6 sounds good and i suppose 3:1 is close to the simplified ratio of that, if it had been 18:6..
    They'll have to accept both 3.14:1 and 3:1 as the ambiguity between theoretical and actual results is their fault.
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    (Original post by Maths4ever!)
    Elements
    yeah but could you put K-for potassium etc
 
 
 
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