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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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    (Original post by Naco88)
    I put because they were less reactive.
    My mistake, didn't look at my reactivity series
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    Mean Question: 5.75 degrees celsius (2 marks)

    Apparatus Question: Digital thermometer, more accurate (2 marks)

    Trends of graph Question: Describe trend of graph, value goes up and how it stops (3 marks)

    Reversible reaction Question: Endothermic (1 mark)

    Percentage question: 82.4% (rounded up) (3 marks)

    Neutral pH question: pH = 7 (1 mark)

    Neutralisation equation: H+ + OH- = H2O (1 mark)

    *??? question???* Aluminium chloride (1 mark)

    6 mark question: 200kg, explain why using graphs (6 marks)

    subatomic particles question: 8 protons 8 neutrons (2 marks)

    Isotope question: Define an isotope, talk about neutrons and protons (3 marks)

    Electronic structure: two bonded pairs, 2 lone pairs of electrons (2 marks)

    what type of bonding? covalent bonding (1 mark)

    why do they not conduct electricity? no overall charge (1 mark)

    nano particles question: 1-100nm (1 mark) *probably wrong*
    nano particles have greater surface area (1 mark) *probably wrong*

    Cloudy solution question: precipitate sulfur formed, solid and insoluble (2 marks)

    Rate of reaction question: rate of reaction increases, more kinetic energy, frequent collisions, activation energy (4 marks)

    Change the investigation question: change concentrations of acid (1 mark)

    That's all i remember...

    (these are NOT 100% correct, I may be wrong, its just brief notes from what i remember putting)
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    7ph was there somwehere
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    The last question was about thermosetting and thermosoftening polymers and I think the answer is that thermosetting polymers don't melt when they are heated because they contain cross links, but thermosoftening polymers do as they don't contain cross links. This means that the thermosoftening polymer would be impractical to use in the frying pan handle because it would melt. ☺️
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    For the percentage by mass I put 82% will this still b right because the next number was .3 so I just rounded down
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    For the farm question I put 175 will I get zero marks
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    (Original post by Rebqqq)
    For the farm question I put 175 will I get zero marks
    No, if you have justified why, you will get marks.
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    last q: thermosetting is better as it requires more energy, due to stronger intermolecular forces and cross links, has a high melting point, whereas thermosoftening has no cross links and has weak intermolceular forces
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    (Original post by thecomputernerd)
    7ph was there somwehere
    The pH of 7 was quite early on in the paper and yes, it was the answer to the question about the pH of a neutral substance.
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    (Original post by Brewah)
    Mean Question: 5.75 degrees celsius (2 marks)

    Apparatus Question: Digital thermometer, more accurate (2 marks)

    Trends of graph Question: Describe trend of graph, value goes up and how it stops (3 marks)

    Reversible reaction Question: Endothermic (1 mark)

    Percentage question: 82.4% (rounded up) (3 marks)

    Neutral pH question: pH = 7 (1 mark)

    Neutralisation equation: H+ + OH- = H2O (1 mark)

    *??? question???* Aluminium chloride (1 mark)

    6 mark question: 200kg, explain why using graphs (6 marks)

    subatomic particles question: 8 protons 8 neutrons (2 marks)

    Isotope question: Define an isotope, talk about neutrons and protons (3 marks)

    Electronic structure: two bonded pairs, 2 lone pairs of electrons (2 marks)

    what type of bonding? covalent bonding (1 mark)

    why do they not conduct electricity? no overall charge (1 mark)

    nano particles question: 1-100nm (1 mark) *probably wrong*
    nano particles have greater surface area (1 mark) *probably wrong*

    Cloudy solution question: precipitate sulfur formed, solid and insoluble (2 marks)

    Rate of reaction question: rate of reaction increases, more kinetic energy, frequent collisions, activation energy (4 marks)

    Change the investigation question: change concentrations of acid (1 mark)

    That's all i remember...

    (these are NOT 100% correct, I may be wrong, its just brief notes from what i remember putting)

    Thanks! I will update this later. I have to be afk for 20 or so minutes.
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    (Original post by Naco88)
    Thanks! I will update this later. I have to be afk for 20 or so minutes.
    No problem hope its all correct haha, I got most the ones near the end correct too i think but I cant remember the questions.
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    I swear it wasn't aluminium chloride it was ammonium chloride
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    (Original post by jackbarry1999)
    No it's because it's more reactive
    No, it is because hydrogen is lower down in the reactivity series than magnesium is - thus making hydrogen less reactive and therefore to be attracted to the cathode over the magnesium ions
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    (Original post by noor.m)
    Okay so for the why is it cloudy question I wrote precipitate at first but then wrote about precipitation, would I still get the mark? and also, for the change question I wrote a stopwatch?
    I think u need to put because sulphur is produced as a solid and this block the view or makes it turn to cloudy
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    (Original post by Brewah)
    Mean Question: 5.75 degrees celsius (2 marks)

    Apparatus Question: Digital thermometer, more accurate (2 marks)

    Trends of graph Question: Describe trend of graph, value goes up and how it stops (3 marks)

    Reversible reaction Question: Endothermic (1 mark)

    Percentage question: 82.4% (rounded up) (3 marks)

    Neutral pH question: pH = 7 (1 mark)

    Neutralisation equation: H+ + OH- = H2O (1 mark)

    *??? question???* Aluminium chloride (1 mark)

    6 mark question: 200kg, explain why using graphs (6 marks)

    subatomic particles question: 8 protons 8 neutrons (2 marks)

    Isotope question: Define an isotope, talk about neutrons and protons (3 marks)

    Electronic structure: two bonded pairs, 2 lone pairs of electrons (2 marks)

    what type of bonding? covalent bonding (1 mark)

    why do they not conduct electricity? no overall charge (1 mark)

    nano particles question: 1-100nm (1 mark) *probably wrong*
    nano particles have greater surface area (1 mark) *probably wrong*

    Cloudy solution question: precipitate sulfur formed, solid and insoluble (2 marks)

    Rate of reaction question: rate of reaction increases, more kinetic energy, frequent collisions, activation energy (4 marks)

    Change the investigation question: change concentrations of acid (1 mark)

    That's all i remember...

    (these are NOT 100% correct, I may be wrong, its just brief notes from what i remember putting)
    I think it was ammonium chloride rather than aluminium chloride. I think the question was what salt is formed when ammonia and hydrochloric acid react together. Also, on the nanoparticle question, it asked about the size of nanoparticles in relation to atoms so I put that atoms are smaller than nanoparticles as well as that nanoparticles have a diameter of 1-100nm. I think you're right about the surface area bit though.
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    6a) Copper atoms/ions have free delocalised electrons that can flow and move throughout the structure, which can carry a charge. [2 or 3 marks]
    6c) Thermosetting get harder and do not break under heat as the cross links between chains hold them together and are strong, whereas thermosoftening polymers have weak intermolecular forces so melts easily under a small amount of energy applied (supplied by the heat from the saucepan). [2 marks]
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    For the 6ix marks i put 190 kg do i still get marks for it
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    I didn't even notice there was a question that went "after neutralisation what was the ph" LOL but I think it's 7, not 0. Because 7 is the neutral pH and just... look in your cgp book I think I'm correct
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    (Original post by hello654321)
    I swear it wasn't aluminium chloride it was ammonium chloride
    It probably was, what was the question? i cant remember haha i just remember something chloride (sounds the same)
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    (Original post by Moustafa123r)
    For the 6ix marks i put 190 kg do i still get marks for it
    Definitely. As long as you supported your answer with reasons and data from the graphs you could get 5 easily or even 6.
 
 
 
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