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    (Original post by Holly.Hodgson99)
    For the question about how to reduce heat loss, I put add a lid so that less heat is lost to the surroundings. Is that right??
    I don't see why that wouldn't be right
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    1b was a nucleus, so was only protons and neutrons


    Posted from TSR Mobile
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    (Original post by JamesHope890)
    From this mark scheme, I got 52 i think. Is that likely to be an A*?

    Also, on the Coursework, I got 40/50. If I get A* on each of C1,2 and 3, how likely am I to get an A* overall?

    Thanks
    I think it might be around 52 for an A*.
    If you get an A* on each of the three exams I think you are pretty likely to get an A* overall.
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    (Original post by Redcoats)
    WOW! Those are great marks! I mentioned the same thing right at the end just for arguments sake after actually providing the correct answer, but I don't think it will be mark-worthy because it does not necessarily answer the question. I may be wrong though!
    Thank you, im just hoping that it doesnt come back to haunt me that one mark, but never the less im happy with the outcome, on the contrary to chemistry and talking biology, I dont see why so many have complained about the 'independant company'. I do business studies and an independent company isnt mentioned anywhere. I thought the answer was pretty blatant and thats its just a company unrelated to the original company, and wont produce bias reaults. Nor did i find the paper too hard, with many issues surrounding the teenagers drinking, i dont understand why there was a problem. For the most part of that paper i felt like they were being easy witht the questions. Hoping for around similar marks in both papers at around 55/6/7 , hoping thats an a*. And im much hoping evryone else achieves the grade they want aswell. Dont forget that a CAU mark can pull you up a grade
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    (Original post by ScienceFantatic)
    I did say that but I'm not sure if it's a mark
    Can only hope that it is, i guess its showing your knowledge of the topic and understanding
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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, 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
    Nice one, think I did well
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    (Original post by DJB2K)
    I don't see why that wouldn't be right
    What heat loss question???
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    (Original post by redsoules)
    Given the premise that "most of the people who use TSR are in the % of students that get >B grades " and that most of the people here today are saying how well they've done in this test, I'd say we can conclude that a high amount of people posting here now will get very good grades. This is because they will have something like 45+ marks so the average here today would be around 45-50 marks = A*. The boundaries are going to be very very high if this is the case nationwide.
    If this is the case nationally then the grade boundaries will be very high but as you just said, people who come to this site are not underachievers and are students who get good grades so it's hard to predict the grade boundaries.
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    (Original post by Redcoats)
    What heat loss question???
    The one about what changes could you make to the apparatus to get a better reflection of the energy content of each fuel, something along those lines.
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    (Original post by DJB2K)
    The one about what changes could you make to the apparatus to get a better reflection of the energy content of each fuel, something along those lines.
    Ah I see. I just wrote use a digital thermometer for more accurate results, which is correct on the unofficial mark scheme.
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    I don't think steel is corrosion resistant
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    (Original post by InneRs)
    I don't think steel is corrosion resistant
    Stainless Steel is
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    is this for the foiundation too?
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    (Original post by ScienceFantatic)
    Was that definitely question 5?
    Nah the 5 marks imo are:

    1. Reacted with Hydrogen
    2. At 60 degrees celc.
    3. With a Nickel catalyst
    4. It makes it easier to spread in products like margerine
    5. Have a longer shelf life.

    At least that's what I got.
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    (Original post by InneRs)
    I don't think steel is corrosion resistant
    It is
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    omg woops i did protons=5 electrons=5 and neutron=6
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    Can someone confirm if this is the whole paper? I think a few marks are missing
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    (Original post by srmed)
    Was the two conditions for cracking: high temperature and hot catalyst


    Posted from TSR Mobile
    or pourrons pot and vaporurs passed over it
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    For the first question i did protons=5 electrons=5 and neutron=6 instead of +1 -1 and 0 ....will that still count as a mark?
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    i don't think all of these are correct
 
 
 
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