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    Hi! I'm getting quite confused with first ionisation energies, would neon have the highest one out of all the first 18 elecments of the periodic table? thanks
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    (Original post by C0balt)
    Link or screenshot please


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    http://www.ocr.org.uk/Images/61532-q...and-groups.pdf

    3d please
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    (Original post by Shadowfire123)
    any other question you are stuck on
    Not sure how m/e works, whats the rule for what deflects least and most. Lost mark on first question :

    Which of the following ions would be deflected least in a mass spectrometer?
    A 35Cl+
    B 35Cl2+
    C 37Cl+
    D 37Cl2+
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    (Original post by nishofficial)
    Im not completely sure, Edexcel must just be testing ability to think outside the spec and charged plate would be a more correct answer than the others
    did you do question 19 a i dont know how to work ot out
    can you show me the method please
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    (Original post by Shadowfire123)
    draw it and you ll understand
    I've tried to and I still don't get it
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    btw do they ask you how do van der Waals forces arise unit 1 or 2
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    (Original post by Shadowfire123)
    did you do question 19 a i dont know how to work ot out
    can you show me the method please
    Im just doing MCQ atm bro, havnt got that far haha
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    (Original post by bob smith 23)
    Hi I'm doing aqa chemistry as level, but there is an example in the CGP book of a shape of molecule that I don't understand: why is SO32- trigonal pyramidal?
    hold on its not trigonal pyramidal its just pyramidal with angle 107
    with 3 bonding pairs and one lone pair
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    (Original post by nishofficial)
    Im just doing MCQ atm bro, havnt got that far haha
    whats MCQ
    • Thread Starter
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    Panicking. Think I've forgotten everything :sad:
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    Calculate the number of atoms in one mole of hydrogen peroxide, H2O2. [The Avogadro constant, L = 6.0 × 1023 mol–1]
    A 1.5 × 10^23
    B 6.0 × 10^23
    C 1.2 × 10^24
    D 2.4 × 10^24

    I thought avogadros number was the number of particles in a mole but its incorrect for this. Why?
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    (Original post by Shadowfire123)
    whats MCQ
    multiple choice
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    Someone who knows there stuff to go over Hess' law? Probably hardest topic & surely benefit TSRians (especially me!)
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    (Original post by nishofficial)
    Calculate the number of atoms in one mole of hydrogen peroxide, H2O2. [The Avogadro constant, L = 6.0 × 1023 mol–1]
    A 1.5 × 10^23
    B 6.0 × 10^23
    C 1.2 × 10^24
    D 2.4 × 10^24

    I thought avogadros number was the number of particles in a mole but its incorrect for this. Why?
    IT JUST SHOW TO 1DP BRO its one atom has 6.0 time 10 to 23
    this mean as there re 2 hydrogen and 2 oxygen there are 4 atoms so time 6.0 time 10 23 by 4 which give u answer D
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    (Original post by alevels2k15)
    10 In an experiment, 1.226 g of potassium chlorate(V), KClO3, was heated.
    A mass of0.320 g of oxygen gas, O2, was collected.2KClO3(s) o 2KCl(s) + 3O2(g) Use the molar mass of KClO3 = 122.6 g mol−1 and relative atomic mass O = 16. The percentage yield of oxygen in this experiment is
    A 17.4%
    B 26.1%
    C 66.7%
    D 100%

    HELP PLEASE!
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    Ignore the top it was for someone else


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    (Original post by nishofficial)
    multiple choice
    OHH RIGHT dont waste on that

    coz i did for practise and was acomplete waste no offence do the long answer you might get a bit of knowlegde
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    I'm so tempted to break my arm or something tomorrow morning and to get my predicted grade! haahhaaha, I'm so unprepareddddd
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    (Original post by Lilieeeeeee)
    I'm so tempted to break my arm or something tomorrow morning and to get my predicted grade! haahhaaha, I'm so unprepareddddd
    lool that much effort for chemistry hahaha and good luck
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    (Original post by C0balt)
    Name:  ImageUploadedByStudent Room1432235544.983707.jpg
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    Ignore the top it was for someone else


    Posted from TSR Mobile
    your too good bro
    you know everysingle question like a boss
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    Write out the spdf notation for aluminium
    1s2 2s2 2p6 2s2 2p1
    Electron is removed from outside to inside, so third, fourth, 10th 11th and 12th and 13th are removal from s orbital

    Al2+(g)->Al3+(g)+e-


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