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    (Original post by emma_1111)
    Was h2so4 the box we had to tick and what was the colour of cr(h20)6 2+
    I said HCl and blue
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    (Original post by emma_1111)
    Was h2so4 the box we had to tick and what was the colour of cr(h20)6 2+
    Yes it was and its blue
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    (Original post by vinchy)
    Purity 50.7 anyone?
    I got that! It's wrong though unfortunately
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    (Original post by emma_1111)
    Was h2so4 the box we had to tick and what was the colour of cr(h20)6 2+
    Yeah i put h2so4 and i think it was blue?
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    (Original post by Suits101)
    I think you could have phosphorus or sulphur for X.
    Not sulphur as the question said these questions are about period 3 elements from Na-P and S comes after P
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    (Original post by emma_1111)
    Was h2so4 the box we had to tick and what was the colour of cr(h20)6 2+
    Not sure I just ticked H2SO4 and blue
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    half equations and full equations for hydrogen oxygen fuel cell in alkaline conditions?
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    (Original post by Suits101)
    I think you could have phosphorus or sulphur for X.
    No you could only have phosphorus as it stars in the question from na to phosphorous
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    (Original post by Suits101)
    I think you could have phosphorus or sulphur for X.
    Said explicitly from Na to P so Sulfur is wrong


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    Completely ****ed up the born haber cycle, honestly no idea how or why I got +1910 or something Stupid mistakes
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    How many marks was the question from a green solid to a green solution? I did excess Nh3 instead of oh-, I also did ammonia for the questions before, BALLS
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    (Original post by Johnny98)
    Enthalpy for lattice dissociation was 2328? And did we have to work out enthalpy of solution, this was negative answer wasn't it?
    Same as my awnser
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    (Original post by LKS1997)
    Not sulphur as the question said these questions are about period 3 elements from Na-P and S comes after P
    O yes!

    I put phosphorus anyway
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    (Original post by vinchy)
    Purity 50.7 anyone?
    Yep that's what i got, ive heard people saying around 90% purity tho
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    That was a lil sneaky of AQA that they specified Na-P, thankfully I actually managed to read the question for once otherwise would've got it wrong
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    I got 74.3% for purity but if that's incorrect I can't work out where I've gone wrong..
    I think it was 26.4cm3 KMnO4 at 0.02moldm-3 which is 5.28x10-4 moles
    Then ratio 2:5 is 1.32x10-3 moles of C2O4 in 25cm3 and 0.0132 moles in 250cm3
    0.0132 / 3 is 4.4x10-3 then I multiplied by Mr for mass of 2.16g?
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    (Original post by 1010marina)
    94.4% purity anyone?
    Yaaas!

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    X = Phosphorus
    Y = Sodium
    Z = Al2O3
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    (Original post by lahigueraxxx)
    I got that! It's wrong though unfortunately
    how many do i lose
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    What was enthalpies of dissociation I think question 3?
 
 
 
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