Hey there! Sign in to join this conversationNew here? Join for free

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%

    Offline

    1
    ReputationRep:
    I thought the pH for the neutral solution was 7 not 0 😂 0 would be very acidic...
    Offline

    1
    ReputationRep:
    For 1d on how to make the results more accurate, i put insulation to prevent heat from the environment altering the temperature of the solution because it was an endothermic reaction, is that wrong?
    Offline

    11
    ReputationRep:
    (Original post by SkyeAmber)
    What one did you all put for the one where you ticked a box? I ticked the third box which was a guess? And for the one where you had to finish the half equation near the end?
    I ticked the first. H+ makes a solution acidic and OH- makes a solution alkaline.
    Offline

    13
    ReputationRep:
    a neutral pH is 7 not 0.
    Offline

    13
    ReputationRep:
    would it be ok to say insulate the cup to prevent energy loss so the thermometer readings are accurate? *because there is no energy transfers
    Offline

    6
    ReputationRep:
    (Original post by SkyeAmber)
    What one did you all put for the one where you ticked a box? I ticked the third box which was a guess? And for the one where you had to finish the half equation near the end?
    i ticked the first box which im 99% sure is correct and for the half equation i just guessed it by writing 2's in the blank space
    Offline

    2
    ReputationRep:
    Wasn't the percentage mass one 14/17 * 100= 82.35 not just 82?
    Offline

    6
    ReputationRep:
    (Original post by epage)
    a neutral pH is 7 not 0.
    Truss me bruv, i was like why the hell did the guy write 0 ahhahaaaahaha
    Offline

    6
    ReputationRep:
    (Original post by GCSE_core)
    Wasn't the percentage mass one 14/17 * 100= 82.35 not just 82?
    init thats what i wrote
    Offline

    2
    ReputationRep:
    (Original post by Naco88)
    Poll: I accidentally set the poll to only display results when it has ended (in 7 days), I am trying to fix this.

    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.

    AQA B2 Higher - Unofficial Mark Scheme (Updated Regularly) (Should have the last 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? 0
    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.

    3. Question on Particles and Nano Particles
    Why are nano particles good catalysts?
    They have a large surface area to volume ratio.
    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?
    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.
    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.


    If you did the B2 exam on Friday, we have the mark scheme for that as well!
    http://www.thestudentroom.co.uk/show....php?t=4155717
    Sulfur doesn't dissolve in the water it is insoluble
    Offline

    1
    ReputationRep:
    Will I still get the marks if I said the answer was 82.35%? I wrote next to it to 2 d.p.
    Offline

    2
    ReputationRep:
    (Original post by imforcedtosignup)
    init thats what i wrote
    You reckon it'll still get the mark?
    Offline

    3
    ReputationRep:
    i got this too?
    Offline

    2
    ReputationRep:
    (Original post by Naco88)
    x
    The pH one is 7 not 0

    Was the one about nanoparticles in relation to atoms on this exam? I put that nanoparticles are 'of the order of a few hundred atoms' and 'bigger than atoms' because that's what it says on the spec (the first bit, anyway!)

    I put that she should keep the concentration of the acid the same and the volume of the solution the same for 4.

    And there was a question that asked for the gas that would form at the negative electrode in the second electrolysis experiment; I think the answer was hydrogen.

    What did people put for a change to the experiment to measure rate of reaction at 5 degrees? (I think that was this one, I'm so confused between C2 and 3!)
    Offline

    2
    ReputationRep:
    Does anyone know how many marks it'll be for a C out of all 3 papers combined?
    Offline

    2
    ReputationRep:
    (Original post by Frankie___)
    Will I still get the marks if I said the answer was 82.35%? I wrote next to it to 2 d.p.
    They usually say in the mark scheme like:
    '82.4%' and then on the side say, 'allow 82%/82.35241...'
    So rounding to any decimal place would be fine (I put the same )
    Offline

    7
    ReputationRep:
    (Original post by krystal16)
    For 1d on how to make the results more accurate, i put insulation to prevent heat from the environment altering the temperature of the solution because it was an endothermic reaction, is that wrong?
    I put that, accuracy is how close it is to the "true value", I gathered that if heat transfers took place, the ultimate temp. would not be close to the "true value". Everyone seems sure about on digital thermometers etc. though idk, at least someone else wrote something similar XD
    Offline

    1
    ReputationRep:
    (Original post by GCSE_core)
    Wasn't the percentage mass one 14/17 * 100= 82.35 not just 82?
    This true. Although normally the examiner will allow for rounding up or down to 82/83.

    Its best to stick with what you and I wrote. 82.35% as in some cases theyll only accept rounding to one decimal place ie. 82.4%
    Offline

    2
    ReputationRep:
    (Original post by CaptErin)
    The pH one is 7 not 0

    Was the one about nanoparticles in relation to atoms on this exam? I put that nanoparticles are 'of the order of a few hundred atoms' and 'bigger than atoms' because that's what it says on the spec (the first bit, anyway!)

    I put that she should keep the concentration of the acid the same and the volume of the solution the same for 4.

    And there was a question that asked for the gas that would form at the negative electrode in the second electrolysis experiment; I think the answer was hydrogen.

    What did people put for a change to the experiment to measure rate of reaction at 5 degrees? (I think that was this one, I'm so confused between C2 and 3!)
    THE GAS IS HYDROGEN?! Lol i totally guessed that if that's right!
    Offline

    6
    ReputationRep:
    (Original post by GCSE_core)
    You reckon it'll still get the mark?
    its 3 marks for that question

    if the odds were somehow against us, then we would still get 2 out of 3 marks, but i dont see why they wouldnt give us full marks. we had got the method right ,right calculation, and i saw a percentage question on a past paper and it had the first 2 numbers after a decimal

    Worst casescenerio : 2 out of 3 marks
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Are unpaid trial work shifts fair?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.