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    What did everyone get for the c2 6 marker about describing and explaining trends?
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    What did everyone get for finding the concentration methods question? (5 marks)
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    (Original post by mghp)
    I think it was because pure copper is too soft
    Do you think they'd accept if you said because it could be bent?
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    is anyone making an unofficial mark scheme?
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    Locked for clean-up
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    Unlocked.
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    I wrote that adding iodine to food could cause health problems


    The roots of education are bitter, however the fruit is sweet.
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    what did you put for the 2 fill in the gaps sentences talking about molecular mass and stuff..... I put grams and then hydrogen
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    Does anyone have any predictions for an A and an A* (grade boundaries) for C3?
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    I am so angry, i crossed out bauxite and said carbon, no clue why. For the coins i said too light and could bend, For food ethical- not organic. i got Pb203, messed up on iodine, other than that I liked the exam and hope an unofficial mark scheme is produced...
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    what did you write for the five marker on C3 about titration and another method?
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    Where did I go wrong for the emperical formula; I got PbO3 btw not Pb203Ok so I divided firstly the mass of the lead by the ar i think it was 207 and got like 0.015Did the same for the oxygen and got like 0.045Then I didivided 0.015 by 0.015 and got 1Then I divided 0.045 by 0.015 and got 3Would I get any marks?Where did i go wrong??
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    (Original post by rumana101)
    is anyone making an unofficial mark scheme?
    I hope so
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    Would they allow alumina​ for bauxite?
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    i was really satisfied with the 6 markers in unit 2+3 they were a whole lot better than the ones in biology for me
    it's weird cause i normally find bio harder than chem but this was easier
    think i got c grade which i'm super satisfied with cause i was getting d grades before the exam
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    (Original post by TheTruthTeller)
    Where did I go wrong for the emperical formula; I got PbO3 btw not Pb203Ok so I divided firstly the mass of the lead by the ar i think it was 207 and got like 0.015Did the same for the oxygen and got like 0.045Then I didivided 0.015 by 0.015 and got 1Then I divided 0.045 by 0.015 and got 3Would I get any marks?Where did i go wrong??
    I used your way but i got 1.5 for the oxygen i think it was, so i doubled that to make it 3 and doubled the 1 from lead to make it 2, pb203
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    what did people get for the question about disadvantages and advantages of the two methods (it was 5 marks)
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    (Original post by TheTruthTeller)
    Where did I go wrong for the emperical formula; I got PbO3 btw not Pb203Ok so I divided firstly the mass of the lead by the ar i think it was 207 and got like 0.015Did the same for the oxygen and got like 0.045Then I didivided 0.015 by 0.015 and got 1Then I divided 0.045 by 0.015 and got 3Would I get any marks?Where did i go wrong??
    I got 0.03 for the lead one after dividing by Ar so then if you divide 0.045 by that you get 1.5. So then the ratio would be 1:1.5 but you multiply everything by 2 so there's no decimals to get 2:3. I'm pretty sure you would get some marks for the right method though
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    Can someone make an unofficial mark scheme PLEASE
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    I put aluminium oxide instead of bauxite for the electrolysis question. Is that wrong?
 
 
 
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