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    WHY does the voltmeter used to measure the p.d in an electrochemical cell have a high resistance?
    In all the diagrams, I see electron flow through the voltmeter??? confusedd
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    I have come to the point where I know all the answers from the past papers...anyone in the same situation as me, because I did this in jan paper, and only came out with a C grade
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    (Original post by examgirl)
    Please help me with this question, its so hard
    Just add up the electrons on either side of the equation. You get a 5:3 ratio. It's only confusing cause there is more than one thing being oxidised. But that is defiantly a tricky question, not many people would get that so don't sweat it too much.
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    (Original post by sikhtank27)
    I have come to the point where I know all the answers from the past papers...anyone in the same situation as me, because I did this in jan paper, and only came out with a C grade
    Same here, got the same grade too

    Wish I got it remarked as I got the paper back and apparently my examiner didnt understand the concept of error carried forward marks

    Should have got atleast a b
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    (Original post by sikhtank27)
    I have come to the point where I know all the answers from the past papers...anyone in the same situation as me, because I did this in jan paper, and only came out with a C grade
    Hey, i was wondering if you know a good way of learning transition metals, their colors and equations?
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    (Original post by sikhtank27)
    I have come to the point where I know all the answers from the past papers...anyone in the same situation as me, because I did this in jan paper, and only came out with a C grade
    Was this Jan 2013? Where did you get the mark scheme?
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    hey can someone explain the following words with relation to writing cell equations. So, when you write a cell equation by reversing the negative half equation and then adding, what is this showing? I thought this was when the cell was 'working' so would be discharging. But on June 2012, you have to write an equation for discharging and the answer shows you're supposed to reverse the positive. Which do you reverse when it says: charging, discharging, recharged, charged?
    thankyou
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    can someone please send me a link to the jan 2013 past paper and mark scheme. Im desperate! :eek:
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    (Original post by lmccormick)
    can someone please send me a link to the jan 2013 past paper and mark scheme. Im desperate! :eek:
    Here you go:
    Attached Images
  1. File Type: pdf AQA-CHEM5-W-QP-JAN13.pdf (360.2 KB, 97 views)
  2. File Type: pdf AQA-CHEM5-W-MS-JAN13.pdf (152.8 KB, 88 views)
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    (Original post by im7)
    Here you go:
    Thank you soooo much!
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    How is everyone revising last minute? Any tips?

    I'm currently making sure I know the formula of all the oxides, their oxidation states so I know how they react together in acid-base reactions, and learning all the catalyst reaction steps

    Will do some practice calculations after lunch and practice born hater after dinner
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    Someone please attach the jan 2013 markscheme please. Would really appreciate it.


    Posted from TSR Mobile
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    (Original post by bad8oy)
    Someone please attach the jan 2013 markscheme please. Would really appreciate it.


    Posted from TSR Mobile
    It's like 3 posts above yours
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    (Original post by bad8oy)
    Someone please attach the jan 2013 markscheme please. Would really appreciate it.
    They're already posted on this exact page.
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    (Original post by Electronbean)
    WHY does the voltmeter used to measure the p.d in an electrochemical cell have a high resistance?
    In all the diagrams, I see electron flow through the voltmeter??? confusedd
    It's high resistance to prevent any current from flowing in. If current flows in, potential difference will be at 0V and separate reactions will occur at each electrode.
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    Does anyone have a link for somewhere that tells us the TM complex's colours that AQA accepts? Unfortunately, I don't trust my text book all that much since it tells me that [CuCl4]2- is olive green, but apparently that isn't accepted in Mark Schemes.

    Any help would be very much appreciated.
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    (Original post by It'sMeAgain)
    Does anyone have a link for somewhere that tells us the TM complex's colours that AQA accepts? Unfortunately, I don't trust my text book all that much since it tells me that [CuCl4]2- is olive green, but apparently that isn't accepted in Mark Schemes.

    Any help would be very much appreciated.
    The best thing to do is look through the past mark schemes

    And the atual colour is yellow- green, which is basically the same so they will accept olive green (I wrote it in a paper and got the paper back, it was marked correct)
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    (Original post by It'sMeAgain)
    Does anyone have a link for somewhere that tells us the TM complex's colours that AQA accepts? Unfortunately, I don't trust my text book all that much since it tells me that [CuCl4]2- is olive green, but apparently that isn't accepted in Mark Schemes.

    Any help would be very much appreciated.
    [CuCl4] 2- is a yellow solution
    [CoCl4] 2- is a blue solution
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    (Original post by It'sMeAgain)
    Does anyone have a link for somewhere that tells us the TM complex's colours that AQA accepts? Unfortunately, I don't trust my text book all that much since it tells me that [CuCl4]2- is olive green, but apparently that isn't accepted in Mark Schemes.

    Any help would be very much appreciated.
    [CuCl4]2- Yellow solution (green is accepted)
    [CoCl4]2- Blue solution

    Are there any specific colours you require?
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    Is a reaction feasible when deltaG is positive or negative?
 
 
 
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