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2016 AQA Chemistry C2 - Unofficial Mark Scheme 2016 Watch

  • View Poll Results: How many marks do you think you got out of 60?
    0 - 10 marks
    1.86%
    11 - 20 marks
    2.26%
    21 - 30 marks
    10.23%
    31 - 40 marks
    19.52%
    41 - 50 marks
    36.25%
    51 - 60 marks
    29.88%

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    The forward reaction is exothermic so the backwards reaction is ............
    Endothermic
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    3. How does the size of nanoparticles compare to the size of regular particles?
    Much, much smaller (1-100nm across).
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    (Original post by jackbarry1999)
    Better to use nano particles instead of powder as a catalyst because of nanotubes have larger surface area to volume ratio
    same that's what i wrote. but i also said that if you break it up its surface area increases therefore an increase in rate of reaction
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    In the Electrolysis question what was the gas that was produced at the negative electrode is is Oxygen or Hydrogen?
    I wrote Oxygen then crossed it out and wrote Hydrogen is it right?
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    (Original post by Help Me...)
    In the Electrolysis question what was the gas that was produced at the negative electrode is is Oxygen or Hydrogen?
    I wrote Oxygen then crossed it out and wrote Hydrogen is it right?
    Yes, hydrogen would form at the negative electrode.
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    (Original post by Oasis61)
    I wrote it doesn't have any delocalised electrons?? Would that get any marks

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    I'm not sure I wrote about ions because it's quite familiar that water has ions but idk whether the mark scheme will accept it? It could do though
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    (Original post by Meegan543210)
    I'm not sure I wrote about ions because it's quite familiar that water has ions but idk whether the mark scheme will accept it? It could do though
    It was ions because water does not have free electrons but in mineral water the ions of calcium, magnesium, sodium etc can carry the charge but they are not present in pure water.
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    (Original post by Zhundo)
    They could do the experiment at 5 degrees Celsius by putting the conical flask in a water bath heated at 5 degrees Celsius.
    I wrote that lol
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    (Original post by Zhundo)
    It was ions because water does not have free electrons but in mineral water the ions of calcium, magnesium, sodium etc can carry the charge but they are not present in pure water.
    Yeah I thought so that's what I wrote
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    (Original post by livileesmith)
    I put place a lid on beaker to reduce heat loss for the apparatus/more accurate question... Opinions?
    I wrote this as well. I wasn't sure if it was right but a few people on here have done the same and they say it is a correct answer

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    (Original post by TheAce1)
    Am I the only one that didnt find it that easy? Im a triple student and I found C3 easier
    Same. I made a few stupid mistakes on here which I could have easily avoided. I found c3 slightly easier, especially the last 5 marker.

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    (Original post by dee08)
    Same. I made a few stupid mistakes on here which I could have easily avoided. I found c3 slightly easier, especially the last 5 marker.

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    Triple science is mandatory at my school FeelsBadMan
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    (Original post by Naco88)
    Notice: I would like to apologise on my own behalf about getting a question on PH wrong. I put 0 instead of 7. I typed this on my phone so there was bound to be a mistake however I have now checked everything else and it all seems right.
    Hello. Welcome to my AQA Chemistry C2 Unofficial mark scheme! Due to the success of my other mark scheme for AQA Biology which got 40k views I will happily do another and look forward to seeing how you guys found the exam.

    This mark scheme is made completely by people who have done the exam so is written purely from knowledge. We will try and get the questions in the right order however putting marks next to each is very hard so please do not request this. If you remember a question we forgot then feel free to comment it below or contact me on twitter (@NacoRBLX) and I will be sure to add it.
    This mark scheme is not official and was made purely from what we saw in the exam.
    It does not contain all answers.

    AQA C2 Higher - Unofficial Mark Scheme (Updated Regularly) (Should have a few questions of foundation)

    Note: Not all the questions are complete
    1. Question on Temperature Change
    a) 5.75 (do not include the anomaly)
    b)
    c)
    d) How could you change the apparatus to get more accurate results? Use a digital thermometer. It is more accurate.
    2. Question on Fertilisers
    What is the PH after being neutralized? 7
    Percentage by mass: 14+1+1+1 = 17 (14/17) x 100 = 82%
    6 Mark Question about a farmer using ammonium nitrate on his crops. The best value to use was around 200kg because the lowest possible amount went into nearby lakes and it produced the maximum profit. Values between 200kg and 300kg would all probably be accepted. The examinors want to see that you can compare values on all graphs and find one which suits them all. Doing this should get you most of the marks.
    3. Question on Particles and Nano Particles
    Why are nano particles good catalysts? They have a large surface area to volume ratio.
    Put the dots/crosses in the diagram to resemble electrons. Put 2 dots/crosses in the overlapping bits and 6 outside of it. There should be 8 in the outer shell of oxygen so getting them in the wrong places but drawing 8 dots/crosses should get you 1 mark out of 2.
    Attachment 550689
    4. Reaction experiment (cross under flask)
    Why did the liquid go cloudy? Sulfur was produced (see equation) which dissolved in the water.
    What should she keep the same? The amounts of each substance used. The person looking at the cross.
    How could she do it with a temperature of 5 degrees? Cool the liquid
    5. Question on electrolysis (Magnesium Chloride)
    Why do the molecules need to be melted or dissolved in water?
    The particles need to be able to move so they can get to the electrodes. This also separates them.
    Why does magnesium form at the negative electrode?
    It is M2+ so it will be attracted to the negative electrode. It will then gain 2 electrons and therefore no longer be an ion.
    In experiment 2, magnesium did not form at the negative electrode, why?
    The magnesium chloride was dissolved in water so hydrogen atoms are present. These are less reactive than magnesium so will form.
    6. Question on materials
    How does copper conduct electricity? It has free electrons in its structure which can flow through when a current is applied.
    Why is diamond very hard to break? Diamond is hard because it has lots of strong covalent bonds which are hard to break.
    Why would you use thermosetting polymers in pan handles? They are strong and heat resistant. They have a high melting point.
    Predicted grade boundaries will come soon.
    Note: The question parts may not be in the right order.
    This is a mix of my answers and those of the community but they are not guaranteed to be correct.

    Grade Boundary Predictions

    These are completely my predictions, we have decided that it was a fairly
    easy paper so our boundaries are fairly high.

    A* - 49 marks

    A - 42 marks

    B - 32 marks

    C - 25 marks


    Keep an ion this mark scheme. Hopefully it will get a good reaction... All the good jokes argon...
    Oh god the puns... I'm starting to sound like a CGP textbook...

    If you did the B2 exam on Friday, we have the mark scheme for that as well!
    For 1d you could also put a lid on the flask to reduce energy lost as heat and for another thing to keep the same (for a fair test) the concentration of HCl.

    Oh and why the magnesium had to be melted/dissolved is so the ions could move and carry and electric current (it's the electrolyte)
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    (Original post by Zhundo)
    3. How does the size of nanoparticles compare to the size of regular particles?
    Much, much smaller (1-100nm across).
    I thought it said how does it compare to the size of an atom, in which case the nano particles are bigger as they contain roughly a few hundred atoms
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    (Original post by th19dbjb)
    Then u stupid. "Ammonium chloride" was written on that page and it was basic copying.



    U grade for you, matey
    I know I know I am such a cow -.-
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    for 1d- if you said use an insulating beaker to help reduce heat loss would you get the marks or is that wrong?
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    (Original post by ellie12*)
    for 1d- if you said use an insulating beaker to help reduce heat loss would you get the marks or is that wrong?
    correct
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    (Original post by Lily_howes127)
    I thought it said how does it compare to the size of an atom, in which case the nano particles are bigger as they contain roughly a few hundred atoms
    I can't remember, but they usually ask in comparison to regular particles. In this case I think they asked in relation to regular particles of the catalyst. I'm really not sure though because I can't remember haha
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    How did you find it @ahhn9? Was it better than your biology exam as you were really upset about it? I am sure you have done extremely well! Have you revised for textiles yet?
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    (Original post by Zhundo)
    3. How does the size of nanoparticles compare to the size of regular particles?
    Much, much smaller (1-100nm across).
    **** I put 1-100nm has the mark gone


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