OCR Chemistry A 2016 unofficial mark scheme 27/05/16

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    It was a decent paper next one will be hard though. I have a few questions:

    1. My calculator gave me 3.97x10^22 instead of 3.98 will i lose a mark?

    2. I said use a higher resolution top pan balance to reduce percentage error which it actually does?

    3. I said heat again until mass does not change. is this enough detail?

    4. I got 3.33 for the conc. of KI will they accept this?

    5. I USED 3+ INSTEAD OF +3, DO THEY MARK DOWN FOR THIS?

    sorry for the questions but a bit worried.
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    (Original post by BenAtkinson)
    Im guessing 12 marker on EF, mass spec and IR aswell.. Also I think they'll do a hydrolysis mechanism and a big question on ionisation trends. Boltzmann distribution also will come up Im pretty sure
    This has to be a joke. For anyone out their concerned there will NOT be any 12 markers. The highest mark question on any of the 4 depth/breadth specimen/practise papers is 6 marks.
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    I said to use a higher resolution scale so hopefully
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    Kc was 0.160
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    Name:  ImageUploadedByStudent Room1464422297.686474.jpg
Views: 325
Size:  63.6 KBhow did you all do part c
    I did 0.15/(45/1000) and got 3.33
    Would that be right

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    (Original post by laney1999)
    Can you upload pics of he paper with these answers filled in?
    if you go on @ChemistryAlevel twitter theres the paper with the answers filled in that i think a teacher did
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    (Original post by medicapplicant)
    Name:  ImageUploadedByStudent Room1464422297.686474.jpg
Views: 325
Size:  63.6 KBhow did you all do part c
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    Exactly the same way it was done on this paper, except the guy has condensed his working and put it under the equation
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    (Original post by jn998)
    This has to be a joke. For anyone out their concerned there will NOT be any 12 markers. The highest mark question on any of the 4 depth/breadth specimen/practise papers is 6 marks.
    The questions might require a similar amount of detail as the old spec longer questions to get the same amount of marks as the new six markers
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    Grade Boundary predictions?

    I think-

    A- 53
    B-47
    C-40
    D-34
    E-28

    What do you guys think?
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    Do you think for the isotopes question you will lose a mark for not mentioning electrons? I just said same number of protons for similarity and different number of neutrons for difference 😬 I did think about writing electrons but I decided not to for some reason
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    (Original post by KulawiT)
    It was a decent paper next one will be hard though. I have a few questions:

    1. My calculator gave me 3.97x10^22 instead of 3.98 will i lose a mark?

    2. I said use a higher resolution top pan balance to reduce percentage error which it actually does?

    3. I said heat again until mass does not change. is this enough detail?

    4. I got 3.33 for the conc. of KI will they accept this?

    5. I USED 3+ INSTEAD OF +3, DO THEY MARK DOWN FOR THIS?

    sorry for the questions but a bit worried.
    I did all of these except the first, you may possibly drop at the most 1 mark for the first one but that's it, all of the others I'm sure will be fine
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    The unofficial mark scheme for the electron configuration of bromine atom is wrong , 4S2 comes before 3D10
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    (Original post by HarrisonGCSE)
    Got 57 which is either a high b or a low a. On last years boundaries that would be an A but on one of the tougher yars that would be a high b. We will have to wait and see! Btw, for the q regarding how you could decrease the % error, could U say that you could use a measuring device with a greater precision i.e less than 0.005. It is technically correct but would OCR accept this?
    If enough people mention it, they will likely accept it as an answer
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    (Original post by jn998)
    This has to be a joke. For anyone out their concerned there will NOT be any 12 markers. The highest mark question on any of the 4 depth/breadth specimen/practise papers is 6 marks.

    You really think that?.. OCR love to throw in the high 10-12 markers on working out unknown compounds. Just because they're not on the specimen papers. If you look at the majority of the f322 papers, you will find one. Thanks.
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    (Original post by BenAtkinson)
    You really think that?.. OCR love to throw in the high 10-12 markers on working out unknown compounds. Just because they're not on the specimen papers. If you look at the majority of the f322 papers, you will find one. Thanks.
    It's a new course, the questions will not be the same as before. The practise and specimen papers are designed to give students a feel for what the papers will be like. There would be no point putting in a question that students were not prepared for as they would just have to drop boundaries
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    On a lot of the past papers with these types of questions they accept both. The mark scheme usually has a note next to the answer saying accept 3d10 4s2 OR 4s2 3d10
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    (Original post by ineedA)
    The unofficial mark scheme for the electron configuration of bromine atom is wrong , 4S2 comes before 3D10
    They also accept it with 4S2 before 3D10
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    (Original post by medicapplicant)
    Name:  ImageUploadedByStudent Room1464422297.686474.jpg
Views: 325
Size:  63.6 KBhow did you all do part c
    I did 0.15/(45/1000) and got 3.33
    Would that be right

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    I got 3.33 too but I am not sure if thay would be accepted
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    For the last q, would it be 2NaOH as you had to remove 2 Br atoms?????
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    (Original post by banterboy098)
    so 44 would be a high c?
    not sure, work it out as a percentage and compare it to previous years for a rough idea
 
 
 
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