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    I said solubility incrases then decreases, if I got the explanation right I should get 2 marks ? Not CE 0/3 surely
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    For the hexaqua complexes questions, there was something like cr(h20)6 3+ going to X(g) and Y(s). What was X(g). CO2?
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    (Original post by lahigueraxxx)
    what did everyone's graph look like for the hydrogen fuel cell?
    Straight horizontal line?


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    (Original post by mr.purplelambkin)
    Yaaas!

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    I got like 88. Don't know where I went wrong what did u do
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    (Original post by 26december)
    Plot a graph of concentrations and absorption rates using known concentrations of KMnO4
    Then set up colorimeter and place unknown sample and see what it's absorption rate is
    Use the absorption rate on the graph and go across until you find the concentration

    Something like that haha


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    Said something very similar
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    (Original post by Cadherin)
    So you get your 5:2 oxalate to manganate ion ratio by combining half-cell equations.

    Then you divide moles by three because it was a trimolar potassium iron oxalate compound reacting.

    Then you get mass by multiplying by Mr.

    Then you do % purity and get 94.4%.
    Good shout. How many marks of 7 do you reckon would be obtained if the divide by 3 part is missed out, to give a % purity of 35.33 (what i got)?
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    (Original post by Kay Fearn)
    What did people say for effect of increasing pressure on emf
    I said increase as would be a in increase rate of reaction - I don't think reaction was reversible so le chateliers principle would be irrelevant? May be wrong


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    (Original post by OloMed)
    For the hexaqua complexes questions, there was something like cr(h20)6 3+ going to X(g) and Y(s). What was X(g). CO2?
    [Cr(h20)3(oh)3](s)


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    Any idea how many marks I'd lose for getting delta G as -135000? I multiplied delta H by 1000 so delta H and delta S were in the same units :'(
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    (Original post by ManOfJustTin)
    Did anyone else pick sulphur for X?
    I'm such an idiot 😂😂😭

    Still such an easy paper I'm so happy
    I did I'm such an idiot!! how many marks was that question?
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    (Original post by Jonnyss)
    was the second one Na and not Na2O then?
    nah second one asked for the reaction of the element (so Na + H2O) & the first asked for the reaction of the oxide of the element (P4O10 + H2O). i think
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    (Original post by DDan123)
    What did people put down for the last question about colorimetry?


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    It was 3 marks so I put:

    MnO4- ions are purple
    Filter light so only frequencies absorbed by the sample are let through.
    The more concentrated the solution is, the less light it will let through.
    Plot calibration graph with known concentrations and their absorbances. Use line of best fit to find concentration.

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    what do you think grade boundaries for A* will be? 84 last year, I am thinking 86 this year
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    (Original post by hi-zen-berg)
    Good shout. How many marks of 7 do you reckon would be obtained if the divide by 3 part is missed out, to give a % purity of 35.33 (what i got)?
    I got an answer for 35% too


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    (Original post by lahigueraxxx)
    what did everyone's graph look like for the hydrogen fuel cell?
    I drew a straight line across? I thought there was a steady supply of reactants so
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    How many marks would I lose for forgetting to multiply the n of c204- by 10 and getting 9.44% ??
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    (Original post by hi-zen-berg)
    Good shout. How many marks of 7 do you reckon would be obtained if the divide by 3 part is missed out, to give a % purity of 35.33 (what i got)?
    5/7 with ALL correct working shown.
    -A1 for correct answer
    -M4 for dividing by 3
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    (Original post by lahigueraxxx)
    what did everyone's graph look like for the hydrogen fuel cell?
    I put a straight horizontal line because there is a continuous supply of fuel. Anyone else put this ???
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    (Original post by crillieswillies)
    Any idea how many marks I'd lose for getting delta G as -135000? I multiplied delta H by 1000 so delta H and delta S were in the same units :'(
    if you put jmol-1 and not kjmol-1 you won't loose any... did you have to do it to 3 sig figures because i didnt?!?!
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    Why is the purity 94 and not 50.7???/
 
 
 
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