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OCR B (Salters) Chemistry F331 (Chemistry for Life) Thursday 23rd May Exam Discussion watch

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    Do we need to know solubility rules?


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    http://www.ocr.org.uk/Images/73469-specification.pdf just look on this, has everything you need to know for unit 1 and unit 2, and has the a2 stuff on, i'm using it to revise and its really useful
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    (Original post by AGKhan)
    Can anyone help me out this is really bugging me and I know it should be easy:

    2N2O(g) ---> 2N2(g) + O2

    Standard enthalpy change of formation for NO2 = +82.0 kJmol^-1

    Calculate enthalpy change under standard conditions for this reaction


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    imagine you listed the elements underneath. The arrow would be going clockwise from elements to 2N2O and anticlockwise from elements to 2N2 + O2. Therefore youd take anticlockwise - clockwise but as the elements are already formed its 0 - 2 (as two moles) * 82 = -164 kJmol-1
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    (Original post by baddeleyh)
    Do we need to know solubility rules?


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    what do you mean by solubility rules ?
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    Hi~
    Was wondering whether F331 had anything important from the storylines?
    Honestly I don't think I've used it at all for EL :|
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    (Original post by jiyongie)
    Hi~
    Was wondering whether F331 had anything important from the storylines?
    Honestly I don't think I've used it at all for EL :|
    Octane number and CO problems etc are useful in story lines, but they are pretty much learnt by using past papers.
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    Why can't they just have a single book for the course which is decent and has colours?
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    (Original post by krisshP)
    Octane number and CO problems etc are useful in story lines, but they are pretty much learnt by using past papers.
    Yeah, I think I'll be okay with that then. Done most of the past papers so hopefully tomorrow's exam will go well! Thanks

    Good luck to everyone tomorrow!
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    (Original post by jiyongie)
    Hi~
    Was wondering whether F331 had anything important from the storylines?
    Honestly I don't think I've used it at all for EL :|
    Same, don't think anything from storylines is particularly needed, except learn about Mendeleev and how he ordered the period table - why he swapped tellurium and iodine, and how he left gaps for future discovery of elements (p.15 and 16)


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    Has anyone got hold of the January 2013 paper?


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    (Original post by AGKhan)
    Has anyone got hold of the January 2013 paper?


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    got the mark scheme if you want that?
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    what does everybody reckon will come up in this paper? Don't feel like I'm gonna do well in this
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    (Original post by jiyongie)
    Hi~
    Was wondering whether F331 had anything important from the storylines?
    Honestly I don't think I've used it at all for EL :|
    Cracking, reforming, isomerism
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    (Original post by AGKhan)
    Has anyone got hold of the January 2013 paper?


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    F331-01Jan13[1].pdf
    F331_Jan_2013_Mark_Scheme[1].pdf

    Here you go
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    (Original post by baddeleyh)
    Do we need to know solubility rules?


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    Yes, solubility of group 2 hydroxides increases down the group. And solubility of group 2 carbonates decreases down the group
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    (Original post by Mtheodore)
    Yes, solubility of group 2 hydroxides increases down the group. And solubility of group 2 carbonates decreases down the group
    So how come it has never came up on F331 papers?
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    All I'm doing is exam papers exam papers exam papers! Until, I can afford to get at least 40 - 50 marks.

    There's this petition going around the bring back January exams. They need 100,000 signatures before it can be discussed in the house of commons. Please sign if you want it back.

    http://epetitions.direct.gov.uk/petitions/41702
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    (Original post by krisshP)
    So how come it has never came up on F331 papers?
    Im not sure, it may do because its in the book (chemical ideas 11.2)
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    (Original post by krisshP)
    So how come it has never came up on F331 papers?
    Even though it hasn't come up yet, I'm still pretty sure it's in the specification too. That means they may well ask it this time around. Either way, it's better to be safe than sorry
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    (Original post by hen4r)
    Even though it hasn't come up yet, I'm still pretty sure it's in the specification too. That means they may well ask it this time around. Either way, it's better to be safe than sorry
    Yeah, it's stuck in my head now that as you go down group 2, solubility of hydroxides increases while solubility of carbonates decreases.
 
 
 
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