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    (Original post by Desouza123)
    Yeah thats probably right
    what do you think about adding a water bath?
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    I added 29cm3 and 25cm3 for the later question on C3 instead of 30 and 25- do you think that this would be ok?
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    (Original post by AyoubFayez)
    Can somebody please post a C3 mark scheme? That test was so dodgy!
    Yeah it was, first few pages were easy but then it became a bit difficult
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    (Original post by Blueyy__)
    thought that was concentration (x-axis) and temperature going up (y-axis)
    She already had 25cm^2 in the beaker.
    She added 50cm^2 total into the beaker also. (This is not the peak, as she added excess. Basically on the end of the xaxis).
    OVERALL temp change was 10.

    So (25+50) x 4.2 x 10 =
    3150 J
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    http://www.thestudentroom.co.uk/show....php?t=3327275 --OFFICIAL P2 & P3 THREAD--
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    Can you send me them too please - I want to make an unofficial mark scheme
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    (Original post by Rit101)
    I swear 50cm was on the bottom of the grapgh
    Yeah I got 50cm + 25 too.
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    (Original post by Blueyy__)
    but the volume was still 55? not 30 (or 29)
    What did the qustion ASKK? Was it the total volume of the volume of HCL??
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    (Original post by LoganF)
    Yeah I got 50cm + 25 too.
    She already had 25cm^2 in the beaker.
    She added 50cm^2 total into the beaker also. (This is not the peak, as she added excess. Basically on the end of the xaxis).
    OVERALL temp change was 10.

    So (25+50) x 4.2 x 10 =
    3150 J
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    (Original post by Turtlebunny)
    Silver nitrate, sodium carbonate and it was an insoluble base
    I wrote potassium carbonate instead of sodium carbonate?
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    (Original post by Positivedani)
    What did the qustion ASKK? Was it the total volume of the volume of HCL??
    The question didnt state anything. You needed to know how much the total volume of the liquids in the beaker
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    Someone please do a unit 3 mark scheme!
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    (Original post by mediaya)
    Serious you mean you are doing C1 C2 C3 and B1 B2 B3 and P1 2 and 3 ������in a year

    Posted from TSR Mobile
    yep, im doing that too and unit 2 and 3 are on the same day for each science
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    (Original post by ambarellarose)
    I wrote potassium carbonate instead of sodium carbonate?
    That's fine.
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    (Original post by Rit101)
    The question didnt state anything. You needed to know how much the total volume of the liquids in the beaker
    AQaa are wrong there as some people could interpretate that to mean the volume of HCL whilst others will add the HCL to the sodium hydroxide
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    (Original post by Blueyy__)
    but the volume was still 55? not 30 (or 29)
    It really confused me I read 29 as the temp where the highest volume was produced. I thought that was what it meant :/
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    C2 I wrote silver nitrate solutions and and sodium carbonate solution and base ( insoluble) for the last one, can someone pls tell me if that is right?


    Posted from TSR Mobile
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    there was an question about how 50cm3 of dilute hcl will be the same as 25cm3 of hcl in terms of temperature change
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    (Original post by neil20143)
    I made a prediction list of what I think will come in C2 if it'll help!:
    -Diamond & Graphite
    -Nanoparticles
    -Thermosetting & Thermosoftening polymers
    -Catalysts
    -Electroplating? (not sure about this one :/ )
    -Salts
    -Empirical Formula (hasn't come up very recently so it's very likely)
    -Simple Molecules (Why is Carbon Dioxide a gas at room temperature or something like this)




    Is that the salts and electrolysis questions? For this I made a little mind map, colour coded each section so that I could differentiate each bit! That helped me understand what links with what. Then I just had to memorize it If that's your main problem
    Wow, amazing prediction.
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    (Original post by tman24)
    there was an question about how 50cm3 of dilute hcl will be the same as 25cm3 of hcl in terms of temperature change
    it was the sodium hydroxide not hcl
    hard question that was
 
 
 
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