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    (Original post by robyn2000)
    Do you think there will be follow through marks?
    Wdym
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    (Original post by Grogan_OG)
    What do you think the grade boundaries will be like?
    Last year was high af for paper 1...51 for A and 61 for a*
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    (Original post by Vanilla Cupcake)
    first part they gave you the energy per gram (16000) so multiply that by 2 (mass of fuel) to get 32000J (energy released)

    then it said the energy released = mass x specific heat capacity x temp change
    so 32000 = 100 (mass of water) x 4.2 x temp change
    divide by 100 and 4.2 to get 76.2

    Posted from TSR Mobile
    I got that except I left mine to 2 decimal places 76.19
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    (Original post by rahah7)
    Wdym
    Marks for using your first answer to answer the second question? Method marks?
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    (Original post by robyn2000)
    Marks for using your first answer to answer the second question? Method marks?
    Yh I think it will defo have that unfortunately 😭
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    -best metal was A as its least dense so better fuel economy and strongest
    - evaluating the metals as about price, strength and fuel economy due to bieng lightweight or heavy due to density
    - was aluminium as it did not corrode in dry air or damo coniditons only in acidic as it builds an oxide layer#
    - the rate of reaction was 1.5- 1.47
    - amount of grams was either 120 or 60
    - for balancing one of them you only do 2h20 and 4al+302 ---->2alo3
    -32000
    -76.2
    -71.2


    -chromatography shows impure and also mp as 171-173 is too low. to make it you crush,boil,solvent, then get the substance
    - for clean air 6 marker they are same as respiration/photosytnehsis etc counteract each other and nitrogen inert aswell as same as taken and given out.

    -displayed formula is 2 cs with 4fs and brackets with line though them and an n on the side
    - c8h18
    - goretex better as its breathable so the wearer does not get clammy skin and get cold.
    - too small to settle for colloid
    - solvent evaporate and oil is oxidised

    anything more to add or any other questions?
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    http://www.thestudentroom.co.uk/show...1#post65636231
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    (Original post by Grogan_OG)
    What do you think the grade boundaries will be like?
    you tell me
 
 
 
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