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    (Original post by lillyholmes)
    yep! but this unofficial thing saying 4Fe at the start it isn't
    No check yourself, he wrote 2Fe2O3
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    (Original post by toms4242)
    Question 2c could also be:
    Add insulation to the beaker so less heat is lost meaning the final temperature of the water is more accurate.
    Could you have add a lid to reduce heat loss


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    (Original post by lunaticash19995)
    No check yourself, he wrote 2Fe2O3
    he changed it actually ha
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    For the balancing equation question (2 marks) I put:

    2Fe2O3 + 3CO --> 2Fe2 + 3CO2

    I know this is wrong because it's supposed to be 4Fe , but how many marks do you think this would lose?

    Apart from that I think it was definitely a much easier paper than previous years! So I'm guessing the a* grade boundary is around 51/60
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    for the distillation question would it have been okay to say
    -vaporise gases
    -pass through fractional column that is cooler at the top and hotter at the bottom
    -condenses at different temperature so can be tapped off separately
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    I think I got 24,what grade would that be
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    (Original post by Crème brûlée)
    For the balancing equation question (2 marks) I put:

    2Fe2O3 + 3CO --> 2Fe2 + 3CO2

    I know this is wrong because it's supposed to be 4Fe , but how many marks do you think this would lose?

    Apart from that I think it was definitely a much easier paper than previous years! So I'm guessing the a* grade boundary is around 51/60
    I think you would get one mark.
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    (Original post by lillyholmes)
    was the reactivity not todo with pottasium is at the top so requires more energy to decompose where as copper is closer to the bottom and had a difference of 3.1g
    that is what i said, quite a lot of people said that so we should get a mark
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    (Original post by Morgan_moloney)
    I think I got 24,what grade would that be
    Probably same as me... Lol sad times.

    I'd expect that to be a C... really at the most.
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    Thank God this paper was cake
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    (Original post by batouttahell)
    for the distillation question would it have been okay to say
    -vaporise gases
    -pass through fractional column that is cooler at the top and hotter at the bottom
    -condenses at different temperature so can be tapped off separately
    if you said that for the 6 mark, that wouldn't get you many marks because that is not what the question asked? what question was this?
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    For that question where it asks to give 2 reasons why hexane is the best fuel from Table 2, I wrote that it gives out the most energy which is correct according to the mark scheme but for the second point I wrote that the table shows it has the shortest hydrocarbon chains which means its the most flammable. Would that give me two marks?
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    (Original post by thecomputernerd)
    if you said that for the 6 mark, that wouldn't get you many marks because that is not what the question asked? what question was this?
    this was the 3 mark on distillation of ethanol and water, towards the end
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    (Original post by batouttahell)
    this was the 3 mark on distillation of ethanol and water, towards the end
    ohhhhhhh I think I said that somewhere in the paper, I can't remember what that said but I think that should get you some marks yes
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    (Original post by ScienceFantatic)
    Question 1
    Electron shell: 2,3( 1 mark)
    nucleus( 1 mark)
    ( +1), electrons( -1), neutron is uncharged( 3 marks)

    Not in form 2,8,8, has 1,8Boron has 10 electrons, the structure had 9 electrons( 3 marks)

    Question 2
    Tick box: copper oxide(1)

    20.3(2 marks)

    Digital thermometer, more precise and not subject to human error
    Beaker insulated(2)

    Carbon particles produced( particulates)Insufficient oxygen or incomplete combustion(2)

    Best fuel because it produces least smoke/ burns the most cleanly. Produces the most energy per g(2)

    Question 3
    Advantages of hydrogen
    Only product water
    Renewable
    Provides more energy
    No co2 or s02 released

    Disadvantages
    Hydrogen is explosive
    Hard to store because it is a gas
    From natural gas( methane which is a greenhouse gas)
    Engines need to be converted( 6 marks)

    Thermal decomposition(1)

    Question on potassium carbonate: doesn't fully thermally decompose, co2 not released, Bunsen burner temperature is not high enough( 3 marks)

    Reactivity question: the lower the metal on the reactivity series, the easier it is broken down(2)

    Question 4:
    Conditions for cracking: high temperatures and a hot catalyst(2)

    Fermentation question: sugar is dissolved and yeast is added to make ethanol(2)


    Ethanol question: ethene is reacted with steam at high temperatures and catalyst(2)

    Advantages and disadvantages of crude oil vs plants: Crude oil is a continuous process so faster, crude oil is more widely available, crude oil more reliable and things are set up for crude oil fractions

    Non renewable, co2( global warming), SO2

    (4 marks)

    Question 5
    metal ores are ores which contain enough of the metal to be worthwhile extracting( 1 mark)

    It is converted to steel because cast iron is brittle or to make it stronger
    Steel has more uses
    Corrosion resistant
    ( 2 marks)

    2Fe2O3+ 3C = 4Fe+ 3CO2( 2 marks)

    It is not sent to landfill because this takes up space and causes pollution
    It is not reused as it might have lost its strength and become unstable. Saves energy being used. Conserves raw materials
    3 marks)

    Question on distillation: Heat mixture between 80-99 degrees, the ethanol evaporates, cools and condenses to form pure ethanol and then raise temperature to 100 when all ethanol has evaporated to do the same to water( 3 marks).

    Question on carbon neutral: carbon dioxide is a greenhouse gas
    This takes up CO2 when it grows in photosynthesis
    The same amount is released when biofuel or oils are burned
    So no overall increase in CO2
    Continuous Carbon Cycle(3)

    Last question on hydrogenation; 60 degrees, nickel catalyst, double bonds converted into single bonds, increasing boiling point, done so that's it's a solid at room temperature for a thick, spreadable consistency (5)

    Mark somewhere for completing drawing of the alkane(1)

    Bromine goes colourless somewhere(1)

    58 marks I think
    From this mark scheme i got roughly 47, what grade is that likely to be?
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    (Original post by YAY GCSE)
    From this mark scheme i got roughly 47, what grade is that likely to be?
    A but A* if AQA feel generous and lower the grade boundaries
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    (Original post by lunaticash19995)
    A but A* if AQA feel generous and lower the grade boundaries
    Which is unlikely right? More likely they'll go up seeing as the mean score here (small sample and of course, people who come on here are probably in the % of B-A* graders anyway) is around the 45-55 mark.

    Basically, I'm shihtting it.
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    The atom described in the question about incorrect structure was referring to Neon and I think in the question the electron count was of Flourine??

    Or am I wrong?
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    And for the distillation question why is boiling the water also a marking point? The ethanol is already separated out
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    For the question about how the apparatus could be improved, you could say the fuel could burn in complete combustion meaning less waste is produced so more of the heat energy transfers into the water instead of being lost to waste products.
 
 
 
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