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

    2
    ReputationRep:
    (Original post by CCGI)
    For the two control variables I put to keep the volume the same in each repeat and keep the concentrations the same because they also quicken the rate of reaction, would that be correct?
    I put that too so hopefully
    Offline

    2
    ReputationRep:
    For how to make the reaction more accurate I said add a lid so less energy is lost to the surrounding instead of use a digital thermometer, is that wrong.

    Someone pls reply! I'm so worried
    Offline

    1
    ReputationRep:
    (Original post by maymunah12345)
    What If you wrote data logger instead of digital thermometer!!!!!!
    I said data logger too!
    Offline

    0
    ReputationRep:
    (Original post by Ben34bow)
    How did everyone get 200kg for the 6 mark question? I got 250kg - I did 500 + 200 + 50 = 750, and then divided it by 3. I know I will probably get some marks for it, but I just wondered what everyone else did. :confused:
    I just looked at the graphs A, B, C on the left and saw that 200kg was the best, so I said why- highest profit, highest crop yield...
    Not sure what you've done, but you might still get a couple of marks?
    Offline

    1
    ReputationRep:
    i put keep the volume of the solution the same, but my other point was keep the beaker the same.... and then added on 'and the paper' i mean like the type?..
    Offline

    2
    ReputationRep:
    for the cloudy solution one, if I wrote a precipitation formed instead of specifying sulfur, do you think I could get a mark?
    Offline

    6
    ReputationRep:
    1d- use a lid/ insulation to prevent heat loss to surroundings
    Offline

    11
    ReputationRep:
    (Original post by lily628)
    for the cloudy solution one, if I wrote a precipitation formed instead of specifying sulfur, do you think I could get a mark?
    I mentioned sulphur and that it is an insoluble solid. However i accidentally said insoluble sulphur particulates were formed. I meant to say insoluble sulphur precipitate! Would i get the marks?
    Offline

    2
    ReputationRep:
    i said use a digital thermometer as it is more sensitive, this was correct in all my past papers that i had done/. My tip : LEARN MARK SCHEME AND SPECIFICATION ANSWERS!
    Offline

    6
    ReputationRep:
    (Original post by lily628)
    for the cloudy solution one, if I wrote a precipitation formed instead of specifying sulfur, do you think I could get a mark?
    I think it was two marks so I think you'd get one
    Offline

    1
    ReputationRep:
    A* wpuld be around 52-55 because last year was harder than this but it was 50
    Offline

    1
    ReputationRep:
    (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!
    would it be possible to write the marks for the questions?
    Offline

    12
    ReputationRep:
    For the 5c question I thought they were asking what could she do with it at 5c
    I said change concentration of sodium thiosulphate to investigate effect of concentration on rate of reaction
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by molpuffin)
    would it be possible to write the marks for the questions?
    No sorry, I can't remember them and getting them wrong could confuse or worry people.
    Offline

    10
    ReputationRep:
    How many marks was the question about changing the method so that the temperature would be 5 degrees?
    Offline

    0
    ReputationRep:
    what did people get for the question about comparing size of nanotubes and an atom ?
    Offline

    10
    ReputationRep:
    (Original post by survivors2000)
    what did people get for the question about comparing size of nanotubes and an atom ?
    I put that it was far smaller than an atom and then wrote 1 nm = 10-9 m
    Offline

    0
    ReputationRep:
    (Original post by dee08)
    For how to make the reaction more accurate I said add a lid so less energy is lost to the surrounding instead of use a digital thermometer, is that wrong.

    Someone pls reply! I'm so worried
    i wrote that aswell i think its right cause it said a change made so it can lid and using digital thermometers or any other stuff
    Offline

    0
    ReputationRep:
    (Original post by Redcoats)
    I put that it was far smaller than an atom and then wrote 1 nm = 10-9 m
    yah i wrote the same that is smaller because its 1-100 nanometers
    Offline

    2
    ReputationRep:
    (Original post by survivors2000)
    what did people get for the question about comparing size of nanotubes and an atom ?
    I said that nanoparticles (of the element) were much smaller compared to an atom (of the same element) as these nanoparticles are measured in nanometres.

    I wonder how many marks this would get...
 
 
 
  • 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
    What's your favourite Christmas sweets?
  • 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.