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    (Original post by zippy103)
    what mark scheme answers ?! Where are they ?!
    Lol. PAST PAPER mark scheme
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    Can anyone predict the grade boundaries?
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    Here's the F331 June 12 MS you wanted, Krish P.
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  1. File Type: pdf F331-01Jun12.pdf (162.0 KB, 262 views)
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    (Original post by NielsBohrsDad)
    Because i sat there in that exam thinking to myself, it says energy here and radiation- should i write photon? because photons always part of the mark scheme wen i used to write energy lol!!

    What about the mass spec question
    for these Two 3 and 4,markers my answers were so muddled up hope the examiner understands lol.
    For Mass Spec I put:

    1. Sample is Vaporised and passed in through sample inlet.
    2. Bombarded with high-energy electrons, an electron is knocked off- ionises it,
    3. Accelerated by an electric field.
    4. Passes through drift region to detection by the ion detector- time measured to get to detector.
    5. Larger isotopes will take longer to reach than smaller isotopes.

    Think that should be 5 marks?


    (Original post by krisshP)
    Read post 328 in this thread for what I wrote down
    Not sure if they will allow that- depends how picky they are
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    (Original post by cheetahs56)
    For Mass Spec I put:

    1. Sample is Vaporised and passed in through sample inlet.
    2. Bombarded with high-energy electrons, an electron is knocked off- ionises it,
    3. Accelerated by an electric field.
    4. Passes through drift region to detection by the ion detector- time measured to get to detector.
    5. Larger isotopes will take longer to reach than smaller isotopes.

    Think that should be 5 marks?




    Not sure if they will allow that- depends how picky they are
    Do you name the areas for 1, 2, 3 and 5?
    Sample inlet, ionisation area, acceleration area, drift region and ion detector.

    I named them and described each one.
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    (Original post by cheetahs56)
    For Mass Spec I put:

    1. Sample is Vaporised and passed in through sample inlet.
    2. Bombarded with high-energy electrons, an electron is knocked off- ionises it,
    3. Accelerated by an electric field.
    4. Passes through drift region to detection by the ion detector- time measured to get to detector.
    5. Larger isotopes will take longer to reach than smaller isotopes.

    Think that should be 5 marks?




    Not sure if they will allow that- depends how picky they are
    What about saying defection by an electric field for mass spectroscopy
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    I've used the correct method on the energy density question but I've got the wrong answer because I miscounted the number of carbons in the skeletal formula before -.- Will i get ecf and get all 3 marks for it? I'm panicking!!
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    (Original post by cheetahs56)
    For Mass Spec I put:

    1. Sample is Vaporised and passed in through sample inlet.
    2. Bombarded with high-energy electrons, an electron is knocked off- ionises it,
    3. Accelerated by an electric field.
    4. Passes through drift region to detection by the ion detector- time measured to get to detector.
    5. Larger isotopes will take longer to reach than smaller isotopes.

    Think that should be 5 marks?




    Not sure if they will allow that- depends how picky they are
    I think i did something similar, only with mine i said after the ionisation bit- that the ions are accelerated by an electric field to ensure they all have the same kinetic energy- and because of this increased energy, it meant that only the mass could affect the time taken to reach the detector- i vaguely spoke about the detector and didnt call it an ion detector- i called it a detector lol!! then i just said it meant that lighter ions reached first.

    And also the empirical formula of cerium oxide- i really dont see where i went wrong i did 81.4/240.1(seeing as there was 2 cerium atoms in the ce2o3) and 18.6/48(3 oxygens in the ce2o3)
    and my final answer was ce506 which nobody got!!!
    Lol!!
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    (Original post by EstebanK0)
    Do you name the areas for 1, 2, 3 and 5?
    Sample inlet, ionisation area, acceleration area, drift region and ion detector.

    I named them and described each one.
    the main point of tis question is that you definitely talk about kinetic energy and mass- so therefore i reckon it would have focussed on the ion detector and the acceleration area
    i didnt really mention them i jus talked about the processes e.g the ions are then accelerated by an electric field and e.g ions are detected(lighter first)- im guessing that gets me a mark as AW(alternatively worded)?
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    anyone doing f332 on the 16th?
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    (Original post by EstebanK0)
    Here's the F331 June 12 MS you wanted, Krish P.
    That is the QP not MS
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    What did everyone get for the empirical formulae question???

    I got CeO2
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    Whoops:
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  2. File Type: pdf F331_MS_June12.pdf (238.7 KB, 429 views)
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    (Original post by EstebanK0)
    Do you name the areas for 1, 2, 3 and 5?
    Sample inlet, ionisation area, acceleration area, drift region and ion detector.

    I named them and described each one.
    Yeah I did name them Do you think I would get 5 marks for it?

    (Original post by krisshP)
    What about saying defection by an electric field for mass spectroscopy
    I didn't say that- do you reckon my points would merit 5 marks?


    (Original post by NielsBohrsDad)
    I think i did something similar, only with mine i said after the ionisation bit- that the ions are accelerated by an electric field to ensure they all have the same kinetic energy- and because of this increased energy, it meant that only the mass could affect the time taken to reach the detector- i vaguely spoke about the detector and didnt call it an ion detector- i called it a detector lol!! then i just said it meant that lighter ions reached first.

    And also the empirical formula of cerium oxide- i really dont see where i went wrong i did 81.4/240.1(seeing as there was 2 cerium atoms in the ce2o3) and 18.6/48(3 oxygens in the ce2o3)
    and my final answer was ce506 which nobody got!!!
    Lol!!
    Eek!! I didn't mention the kinetic energy but I did say that lighter ones would reach the ion detector first, do you think I would get 5 marks? Don't think the detector point you put should make you lose a mark, unless the examiner is a ****.

    For the empirical you do the percentage over the mass, that was your mistake, plus you shouldn't have used Ce2O3, you should have imagined them as 1 mole, i'm not really sure why you did that.

    It should have been:
    18.6/16= 1.16
    81.4/140.1= 0.58

    So 0.58:1.16
    1: 2

    Therfore CeO2.


    (Original post by krisshP)
    What did everyone get for the empirical formulae question???

    I got CeO2
    Same!!!
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    I wrote about how they would have the same kinetic energy and that the drift region is in a vacuum so that ions do not collide with air molecules.
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    (Original post by NielsBohrsDad)
    i dont get that though carbon dioxide dot cross diagram had 2 electron pairs shared by carbon and oxygen on either side. and the question asked about the dot cross diagram. they both hav double bonds. and it didnt ask about the structure of the giant network just the dot cross...

    also there was another question later about properties i remember what was that question?
    I have absolutely no idea what the correct answer for the bonding one was, but people did write down silicon has 4 bonding pairs with 4 oxygens, hence the single bonds.

    Oh yeah, about mendeleev and how the the properties fit into the gaps or something. This had already come up in a past paper.
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    (Original post by EstebanK0)
    I wrote about how they would have the same kinetic energy and that the drift region is in a vacuum so that ions do not collide with air molecules.
    Do you have to talk about the drift region? I don't think I talked about the drift region
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    (Original post by estebank0)
    whoops:
    thanks
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    How did everyone get their answer to the energy density one?
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    (Original post by lisarules23)
    How did everyone get their answer to the energy density one?
    1000/112 (Mr of Hydrocarbon)

    Answer x enthalpy value.
 
 
 
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