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OCR Salters Chemistry B F332 Advance Notice Jan 2011 Understanding Our Changing Atmos Watch

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    Oh I see, thanks. I haven't cone across any questions involving PPM so I hope it's that easy!
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    Two questions.

    In what ways are PPM by mass different to PPB by volume?

    Why can CO2 not react with OH radicals?
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    (Original post by AGM)
    I thought Vacuum Filtration would be tested in next Wednesday's glorious test.
    Oh right!

    What about Froth Flotation?!!!
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    (Original post by Darthdevidem)
    Oh right!

    What about Froth Flotation?!!!
    Things like froth floatation and vacuum filtration were part of the legacy syllabus topic on metal ores etc. They won't come up in this exam.

    -- If anything, they more likely to come up in the F334 exam on the 26th, but it is unlikely.
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    (Original post by jpurkis1)
    Things like froth floatation and vacuum filtration were part of the legacy syllabus topic on metal ores etc. They won't come up in this exam.

    -- If anything, they more likely to come up in the F334 exam on the 26th, but it is unlikely.
    Do you know anything else that was in the past syllabus but won't be coming up now?! Thanks!!
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    (Original post by Jcornwell)
    Extremely last notice...still, better late then never.

    http://www.4shared.com/document/-csn...JUN_10_QP.html

    It should work. I found it whilst at school and the filtering system here prevents me from opening it. Good luck everyone for the exam tomorrow.

    p.s.
    sorry if the link doesn't work.
    thats the normal ocr a f322 exam not the ocr salters b f332.

    at least its nice of u that u tried!
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    Froth flotation is the only thing that has been taken out to the best of my knowledge.
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    (Original post by patrick93)

    Got an E, really don'tknow how though :/
    nor do i. thought i'd done so well.
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    Good luck for tommorow guys, let's hope the advanced notice isn't a *****.
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    Is the exam morning or afternoon? Ive lost my exam timetable
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    (Original post by Will170393)
    Is the exam morning or afternoon? Ive lost my exam timetable
    afternoon, PM. i've lost mine too. but have it saved on my phone's calender
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    If anyone is interested why NO2 decreases but NO doesn't increase for the second part of the graph jump to page 17 of this: http://www.inl.gov/technicalpublicat...ts/4655304.pdf

    "Photolytically-produced •NO3 and •NO2 radicals are reported to add to aromatic rings in the gas phase, resulting in nitrated aromatic products.[1,2,3] These addition reactions may be direct, or mediated by hydroxyl (•OH) radicals.[4,5] In the mediated mechanism, the initial addition reaction of the highly reactive •OH radical produces a hydroxylated cyclohexadienyl radical, which may then add •NOx as shown in equation 1.[1] The addition product eliminates water to form a stable nitrated aromatic product."

    Also has a very nice and clear diagram


    Good thing is, it's not something we should know anyway So 99% it won't come up! But if anyone is just naturally curious (like me, I hate unsolved problems) go hop on and have a look ^.^
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    Solid paper!

    What did you guys put for "What research went behind realizing the ozone layer was depleting and why was evidence revoked"?!?!?!
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    Since when were there 7 mark questions. That's pissed me off. Personally I think the paper was ok but they were a little hars with the questions e.g. the one about the testing of the atmosphere to see ozone levels were falling from the chemical storylines,
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    All the answers to the last 7 marker question was in the article. Thought it was a good paper
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    What did you put for:

    a source of propene?

    reagents and conditions for converting propene to propan-2-ol?

    reagents and conditions for converting propane to 2-chloropropane?
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    (Original post by russdood93)
    What did you put for:

    a source of propene?

    reagents and conditions for converting propene to propan-2-ol?

    reagents and conditions for converting propane to 2-chloropropane?
    1. Cracking of alkanes

    2. Water and phosphoric acid catalyst and heat at high temeprature and pressure

    3. HCL, sulphuric acid concentrated, heat under reflux (I think this is wrong)
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    (Original post by Darthdevidem)
    1. Cracking of alkanes

    2. Water and phosphoric acid catalyst and heat at high temeprature and pressure

    3. HCL, sulphuric acid concentrated, heat under reflux (I think this is wrong)
    For 1. I would've said crude oil
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    (Original post by Darthdevidem)
    1. Cracking of alkanes

    2. Water and phosphoric acid catalyst and heat at high temeprature and pressure

    3. HCL, sulphuric acid concentrated, heat under reflux (I think this is wrong)
    i put HCL, room temp and pressure and heat under reflux ><
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    what did people get for the question about equilibria?
 
 
 
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