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Edexcel 6BIO7/01 (International Unit 3B) ~ 7th May 2013 ~ AS Biology Watch

  • View Poll Results: Which practical do you expect? ~Biology unit 3 May 7~
    Daphnia (effect of caffeine on heart beat rate)
    13.51%
    Test for vitamin C
    16.22%
    Membrane permeability (Beetroot)
    24.32%
    Enzyme concentration
    16.22%
    Mitosis (Onion root cell)
    75.68%
    Tissue culture
    10.81%
    Tensile strength of plant fibres
    10.81%
    Mineral deficiencies
    10.81%
    Antimicrobial properties of plants
    21.62%

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    (Original post by StUdEnTIGCSE)
    OK. :dontknow:
    So the observation should have been no white precipitate formed.
    Will they mark KI wrong if I had written white precipitate formed?

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    Maybe white ppt formed and it dissolved in in HCl?

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    (Original post by StUdEnTIGCSE)
    OK. :dontknow:
    So the observation should have been no white precipitate formed.
    Will they mark KI wrong if I had written white precipitate formed?

    Posted from TSR Mobile
    No.
    They will assume that you thought that that observation was for no sulphate present. So that point you will lose but ki you will get.
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    (Original post by Relaxedexams)
    Maybe white ppt formed and it dissolved in in HCl?

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    So then sulphite could be present? I think you should say effervescence seen as sulphite ion can also be considered as sulphate iv ?
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    (Original post by Relaxedexams)
    Maybe white ppt formed and it dissolved in in HCl?

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    I added "and remains".

    (Original post by TheKingOfTSR)
    No.
    They will assume that you thought that that observation was for no sulphate present. So that point you will lose but ki you will get.
    No ECF is when you get it wrong, isn't it?

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    (Original post by Relaxedexams)
    KI

    No need to take mass of zn into consideration. Only mass of CuSO4 solution.

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    Why "no need to take mass of zn"?
    :confused:
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    (Original post by TheKingOfTSR)
    Why "no need to take mass of zn"?
    :confused:
    Because never in the past papers it was so.

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    (Original post by TheKingOfTSR)
    Why "no need to take mass of zn"?
    :confused:
    I think maybe because it has a negligible heat capacity, or because it was added in excess, I'm not really sure.


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    (Original post by StUdEnTIGCSE)
    Because never in the past papers it was so.

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    (Original post by KhawlaM)
    I think maybe because it has a negligible heat capacity, or because it was added in excess, I'm not really sure.


    Posted from TSR Mobile
    No.
    The question clearly stated : calculate the heat transferred to the mixture!
    And assume the specific heat capacity of the mixture.....
    Mixture means solid and liquid ..right?
    And the equation given was NOT mass of solution * .... it was just mass!
    Zn is used up.....it just not stay just intact...thus we must consider its mass too
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    This is the biology thread right.....
    Forgive me for discussing chemstuff
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    (Original post by TheKingOfTSR)
    No.
    The question clearly stated : calculate the heat transferred to the mixture!
    And assume the specific heat capacity of the mixture.....
    Mixture means solid and liquid ..right?
    And the equation given was NOT mass of solution * .... it was just mass!
    Zn is used up.....it just not stay just intact...thus we must consider its mass too
    That's hilarious.
    But did you get exact answers in your calculations?

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    Here is the download link to the paper! Not the marking scheme only the paper
    https://www.facebook.com/download/37...y%202013-1.pdf
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    (Original post by TheKingOfTSR)
    Why "no need to take mass of zn"?
    :confused:
    we are taking the specific heat capacity of the solution right? (well technically it is specific heat capacity of water) then the energy would be absorbed into the solution..so i guess we have to take the mass of the solution into consideration to calculate the amount of energy. gosh i hope im not wrong!!! i made such stupid mistakes on the paper
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    (Original post by TheKingOfTSR)
    Why "no need to take mass of zn"?
    :confused:
    My tutor kept telling us to only take mass of solution and never get confused by wordings of the question.

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    (Original post by StUdEnTIGCSE)
    I added "and remains".



    No ECF is when you get it wrong, isn't it?

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    I said white ppt is formed which dissolves in HCl. Wonder if ill get da mark...

    I assumed there might be carbonate or sulfite ions...:dontknow:
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    (Original post by NilFBosh)
    Here is the download link to the paper! Not the marking scheme only the paper
    https://www.facebook.com/download/37...y%202013-1.pdf
    Link doesn't work...

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    (Original post by Relaxedexams)
    I said white ppt is formed which dissolves in HCl. Wonder if ill get da mark...

    I assumed there might be carbonate or sulfite ions...:dontknow:
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    But then if what you say happens then there would have been more to the inference.

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    (Original post by StUdEnTIGCSE)
    But then if what you say happens then there would have been more to the inference.

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    Yea I suppose so. Like fizzing or something...1 mark was it?

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    Sorry. Here is the paper.
    http://www.scribd.com/doc/140420023/...al-Alternative
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    (Original post by Relaxedexams)
    Link doesn't work...

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    Here.
    http://www.scribd.com/doc/140420023/...al-Alternative
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    Pls dicuss Chem questions in the chemistry exam thread.
 
 
 
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