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    How does everyone feel about the calculations questions?

    They like to include these often in the context of titrations for example and finding the mol of substances (e.g with Avogadro's Constant)
    The quantitative assessment that I did earlier in the year gave me a lot of practice in this!
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    Can somebody throw a tonne of questions at me? I need to improve to an A or higher and I got a C in my mock :-|


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    (Original post by MathsNerd1)
    Can somebody throw a tonne of questions at me? I need to improve to an A or higher and I got a C in my mock :-|


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    Try the Specimen papers
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    (Original post by yodawg321)
    Try the Specimen papers
    Where are they?


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    who's prepared for this ?
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    (Original post by Kloe95)
    Hi there!
    so basically as Al has 13 electrons I.e. the atomic mass is 13, the order of sub shells is 1s2, 2s2, 2p6, 3s2, 3p1.
    As the first ionisation energy is removing the electron from the outside shell, IE 1 is not from an 's' sub shell, however the next 2 electrons removed are (from the 3s sub-shell) and that corresponds to IE's 2 and 3. Then the next shell they will be removed from is the 2p, so the next 6 IE's will not be removing electrons from s sub shells, which relates to IE's 4,5,6,7,8,9. After this they are once again removed from an s sub shell (2s2) so this is IE's 10 and 11, leaving you with 2,3 10 and 11
    This helped ! God bless you
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    (Original post by MathsNerd1)
    Where are they?


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    http://www.ocr.org.uk/Images/70644-u...s-specimen.pdf
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    Thanks!


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    Anyone want to test eachother? Lets see how we compare to eachother?
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    (Original post by MathsNerd1)
    Thanks!


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    They are normally more challenging than the real papers ( I think) , wish there was more of them :/
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    (Original post by yodawg321)
    They are normally more challenging than the real papers ( I think) , wish there was more of them :/
    Is there only that one as I've been able to answer the questions mainly in my head :-/
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    (Original post by MathsNerd1)
    Is there only that one as I've been able to answer the questions mainly in my head :-/
    No more , Tbh ran out of things to do. Completed all past papers twice, made notes twice. Now just going through the exam questions in the book.

    hows your revision?
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    (Original post by hassanakhtaruk)
    I'm going to predict we will get a big marker on covalent structures like diamond and graphite and a question on why ionic compounds conduct electricity when in a liquid state and not in a solid state...
    totally agree
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    (Original post by MathsNerd1)
    Anyone want to test eachother? Lets see how we compare to eachother?
    Lets start questions
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    (Original post by MathsNerd1)
    Anyone want to test eachother? Lets see how we compare to eachother?
    Yeah we can test each other if you're still willing.
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    (Original post by yodawg321)
    Lets start questions
    Beat me to it
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    I've got one to start: Define the term: First Ionisation Energy
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    (Original post by yodawg321)
    No more , Tbh ran out of things to do. Completed all past papers twice, made notes twice.
    Haha good for you! I've done four papers and only started flash cards today...
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    (Original post by niniesta96)
    I've got one to start: Define the term: First Ionisation Energy
    Amount of energy needed to remove an electron from each atom in one mole in a gaseous state.

    (Doubt this will come up because it came up in Jan)

    Q) Define Mole
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    I'm up for any questions. Explain the properties of NaCl and F2 and why the melting point is much higher in the former than the latter.


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