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    (Original post by Eddiz7)
    2Fe2O3+ 3C = 4Fe+ 3CO2( 2 marks)

    I think the right answer is 2Fe2O3 + 3C = 2Fe2 + 3CO2
    I did this too, like I wrote Fe with a little 2 on the end and balanced from there, wtf
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    (Original post by Eddiz7)
    2Fe2O3+ 3C = 4Fe+ 3CO2( 2 marks)

    I think the right answer is 2Fe2O3 + 3C = 2Fe2 + 3CO2
    I wrote this too but i think it's wrong lol (

    also that exam wasn't bad so i think the grade boundaries are as follows

    Grade boundaries leaked for #aqachemistry
    A*-60
    A-59
    B-58
    C-57

    hopefuly not lolololol #sarcasm
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    (Original post by Eddiz7)
    2Fe2O3+ 3C = 4Fe+ 3CO2( 2 marks)

    I think the right answer is 2Fe2O3 + 3C = 2Fe2 + 3CO2
    Unfortunately i did what you did too and its not right as iron is not a covalently bonded molecule. The answer given in the unofficial mark scheme is the correct one although you may get 1 mark as the whole thing was two marks.
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    (Original post by Abdullah7861)
    Wouldn't it be smelting instead of thermal decomposition?
    Nope, the metal carbonate is broken down by heating therefore thermal decomposition.
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    (Original post by Dizgurl)
    What would the grade boundaries be like?
    very high as people found the test easy
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    was it just in the nucleus for question 1?
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    For the more accurate temperature one, I said to use a polystyrene cup because less heat will escape, making it more accurate...is this right pls
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    (Original post by pussymagnet)
    was it just in the nucleus for question 1?
    yes mr pussy
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    (Original post by pussymagnet)
    was it just in the nucleus for question 1?
    Yes.
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    can someone ****ing explain why its boron?
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    (Original post by Ads.m)
    Nope, the metal carbonate is broken down by heating therefore thermal decomposition.
    ohh i understand now
    thanks
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    according to this mark scheme i got 42 marks which is an A
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    (Original post by onychair)
    You get best look with onychair, and look fantastic in your group.
    was there a question on neon anywhere? with the 9 electrons when it should of been 10 because this **** markscheme dosent say it
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    (Original post by dh12345)
    can someone ****ing explain why its boron?
    The first question where it asked you to complete the electronic structure was boron (2, 3) and the question after where it asked to explain why figure 2 wasn't correct is the neon atom.
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    (Original post by Ads.m)
    Yes.
    so it was just neutrons and protons you had to talk about?
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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 sure if it was in the nucleus or just the atom overall

    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, reacted with hydrogen, 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)

    Took me a while to make so any rep would be much appreciated
    At the lowest I've got 52/60. What grade do you think that is?
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    (Original post by ScienceFantatic)
    Which question?
    The question with the multi choice after the thermal decomposition
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    For the question about how more energy could be produced from the hydrocarbons and 100cm of water-I said heat it for longer than two minutes so the particles collide
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    (Original post by B3ASTy)
    I missed the first question somehow and many others did too... HOW?!?!
    i didnt see it at all??????????
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    (Original post by WaeAM)
    It wasn't Boron it was Neon when explaining what was wrong with the structure. It had 9 electrons, Neon has 7
    yeah but neon has 10 it said it was in the same row as lithium
 
 
 
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