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    thats the book I use and it doesnt say that :/ page 207 shows the colours, it says pink solution then blue precipitate then beige in air.
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    (Original post by Dr00n)
    yeah i get all that but what does the hydrogen electrode actually look like when you draw it out?
    Ignore the poverty-ness
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    (Original post by needtosucceed=))
    thats the book I use and it doesnt say that :/ page 207 shows the colours, it says pink solution then blue precipitate then beige in air.
    Eh guess my revision guide is lame >.> I'll be referring to the book now *two days before the exam* ;_;
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    I reask:
    Anyone can work out the number of moles of O2 in:
    Jan 2011: 7(a)(i)?

    LOL 2 days from exam and no one can do it?
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    (Original post by eggfriedrice)
    A question guys;
    If you're asked to sketch a concentration against time graph, will the bottom end of the end touch the x axis or just tend towards it?
    I would probably tend towards it personally, and not actually touch it.
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    (Original post by eggfriedrice)
    A question guys;
    If you're asked to sketch a concentration against time graph, will the bottom end of the end touch the x axis or just tend towards it?
    It will NEVER touch.
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    (Original post by Theafricanlegend)
    You posted it on a forum so yes, you probably did expect a reply and you got one.
    Oh how I'd love to be the one that knocks you out! Why come onto this thread and post rude comments when this is designed so people can help each other out for when they get stuck. We don't need the people like you posting as you're clearly too arrogant to even consider being nice.

    Bet you're not as good at Maths, that's where I'm going to specialise, also I hope I never have you as my doctor if you become one as you're insensitive and wouldn't want to be in control of my life.


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    (Original post by eggfriedrice)
    A question guys;
    If you're asked to sketch a concentration against time graph, will the bottom end of the end touch the x axis or just tend towards it?
    Well it will never touch because there is an asymptote when y = 0 so it just tends towards 0 but never reaches it I believe.


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    (Original post by MathsNerd1)
    Oh how I'd love to be the one that knocks you out! Why come onto this thread and post rude comments when this is designed so people can help each other out for when they get stuck. We don't need the people like you posting as you're clearly too arrogant to even consider being nice.

    Bet you're not as good at Maths, that's where I'm going to specialise, also I hope I never have you as my doctor if you become one as you're insensitive and wouldn't want to be in control of my life.


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    A lot of medicine applicants are incredibly arrogant *sigh* at least the ones I know are.
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    (Original post by JP.)
    Is Cr (VI) orange and Cr (III) yellow? If so do we need to know this, it's cropped up in the really old papers before but I'm confused. I always thought Cr (III) was green
    People ask this all the time. I'm going to say no, and I'll make my case.

    1. The syllabus does not say we should learn the coloured ions. Only the precipitate reaction and the ligand substitution observations (the chemicals are all explicitly stated by name)

    2. There has never been a single question where you needed to know the colours, to get all the marks, since the first paper in 2010.

    Now you might feel it helps you to learn them, perhaps to almost foresee the answer to a question or make a good guess, quite a few teachers tell their students to as well. But I've just stated the facts.
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    Namod, why don't you screenshot the question or give us a link, people are busy revising obviously.
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    (Original post by MathsNerd1)
    Well it will never touch because there is an asymptote when y = 0 so it just tends towards 0 but never reaches it I believe.


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    I think it never touches because you can't ever fully react, not 100% sure
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    (Original post by Pride)
    Namod, why don't you screenshot the question or give us a link, people are busy revising obviously.
    By posting this you could have just found it but anyways:
    http://www.ocr.org.uk/Images/65361-q...d-elements.pdf
    Anyone can work out the number of moles of O2 in:
    Jan 2011: 7(a)(i)?
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    (Original post by Pride)
    People ask this all the time. I'm going to say no, and I'll make my case.

    1. The syllabus does not say we should learn the coloured ions. Only the precipitate reaction and the ligand substitution observations (the chemicals are all explicitly stated by name)

    2. There has never been a single question where you needed to know the colours, to get all the marks, since the first paper in 2010.

    Now you might feel it helps you to learn them, perhaps to almost foresee the answer to a question or make a good guess, quite a few teachers tell their students to as well. But I've just stated the facts.
    I think learning the colours of the ions if you have the time wouldn't be a bad idea.

    For example in the last question of the Jan 2013 one (the horrible one). It said V^n+ was purple and you had to work out n+. However, if you had learnt the colours you would have known n was 2+ and of course you could work backwords. It wouldn't really secure extra points because you need the working, but it could help in some ways.
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    (Original post by eggfriedrice)
    I think learning the colours of the ions if you have the time wouldn't be a bad idea.

    For example in the last question of the Jan 2013 one (the horrible one). It said V^n+ was purple and you had to work out n+. However, if you had learnt the colours you would have known n was 2+ and of course you could work backwords. It wouldn't really secure extra points because you need the working, but it could help in some ways.
    It would be a bad idea as you don't need to learn them and you can spend more time learning stuff that you aren't fully good with
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    (Original post by chignesh10)
    It would be a bad idea as you don't need to learn them and you can spend more time learning stuff that you aren't fully good with
    Hence I said if you have the time.
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    (Original post by DudeBoy)
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    Ignore the poverty-ness
    are you sure, i see in a lot of places i've seen a thing H2 gas chamber with a wire of Pt as an electrode.

    Ill go with yours if your sure its right
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    (Original post by eggfriedrice)
    Hence I said if you have the time.
    Hence I am sorry :P

    how are you feeling for this exam?
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    (Original post by Namod)
    By posting this you could have just found it but anyways:
    http://www.ocr.org.uk/Images/65361-q...d-elements.pdf
    Anyone can work out the number of moles of O2 in:
    Jan 2011: 7(a)(i)?
    number of moles of sodium thio = 0.001 x 0.00246dm^3 = 2.46x10^-5 mol

    half that for no. of moles of I2. Double that back up for no. of moles of Mn(OH)3, divide by 4 for no. of moles of O2, I get 6.15x10^-6 mol of O2.

    m = n x Mr = 6.15 x 10^-6 x 32 = 1.968 x 10-4 g = 0.1968mg

    DOC = 0.1968mg / 0.025dm^3 = 7.872
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    (Original post by Dr00n)
    are you sure, i see in a lot of places i've seen a thing H2 gas chamber with a wire of Pt as an electrode.

    Ill go with yours if your sure its right
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