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    I -did- do products - reactants.

    and got -339.
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    (Original post by Supersplodge)
    you have been given values for enthalpy change of FORMATION so its products - reactants = +339 kjmol-1
    Ah that's where I went wrong, I did reactants - products
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    Pretty sure i got that right...11 marks though?! 11? What for? My guess is as follows;

    1.) What's a complex ion
    2.) What's a Ligand
    3.) Bonding (Dative covalent)
    4.) Example structure, plus diagram
    5.) Bond angle
    6.) What's Ligand Substitution
    7.) Example
    8.) Balanced
    9.) Colour 1
    10.) Colour 2
    11.) Structure depends on variable oxidation state...

    A bit shady...not sure about the 11th...
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    i got -1519 - (- 1858) = +339

    The last question was great imo, the biochemistry paper was even better
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    (Original post by HawkAhriman)
    I -did- do products - reactants.

    and got -339.
    You must have got confused with the negatives then...because it was something like;

    -1519 - (2 x -292) = 339
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    I also did a reaction for color change because I was running out of ideas for marks.
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    Oh yeah, the one about Magnesium Nitrate and Oxide? What was the answer to that? I think it was 'Why is the lattice enthalpy of Magnesium oxide far more exothermic than Magnesium Nitrate?'

    I put that the nitrate ion was larger and so had a lower charge density than oxygen. This meant that the attraction between the nitrate and magnesium would be weaker.
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    I'm pretty sure it was positive! Thermal decomposition requires heating so I guess more energy has to be put in. Also my Hess cycle was def right.

    If I put 109 for bond angle instead of 109.5 would they allow it? Got 80% Cu and koh was not in excess. 76.9% purity or something. Only thing I couldn't do on transition was to draw dxy and dx2-y2 although I have looked it up now! I got one of them right by luck. Grade boundaries have gotta be high because it was the easiest t+p I've seen!
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    (Original post by seany_1214)
    I also did a reaction for color change because I was running out of ideas for marks.
    Oh, see i used my example of Ligand substitution for the colour ones...

    [Cu(H_2O)_6] + 4NH_3  ----> [Cu(NH_3)_4(H_2O)_2] + 4H_2O

    going from pale blue to light blue precipitate with a dark blue solution.
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    (Original post by Nazmoth)
    I'm pretty sure it was positive! Thermal decomposition requires heating so I guess more energy has to be put in. Also my Hess cycle was def right.

    If I put 109 for bond angle instead of 109.5 would they allow it? Got 80% Cu and koh was not in excess. 76.9% purity or something. Only thing I couldn't do on transition was to draw dxy and dx2-y2 although I have looked it up now! I got one of them right by luck. Grade boundaries have gotta be high because it was the easiest t+p I've seen!
    are you kidding?
    it was harder than every past paper i've done. And almost everyone i talked to found it hard. I think grade boundries will be low
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    Yeah, it was a very difficult paper. Some very odd questions.
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    I thought t+p was about average, but transition elements was harder than usual... I thought the questions were laid out differently compared with past papers
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    (Original post by jseldis)
    Oh, see i used my example of Ligand substitution for the colour ones...

    [Cu(H_2O)_6] + 4NH_3  ----> [Cu(NH_3)_4(H_2O)_2] + 4H_2O

    going from pale blue to light blue precipitate with a dark blue solution.
    Same, though I used the reaction with cl, going from pale blue to yellow...hopefull they'll give marks for these equations.
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    (Original post by atoms4peace)
    are you kidding?
    it was harder than every past paper i've done. And almost everyone i talked to found it hard. I think grade boundries will be low
    Maybe it was just effective revsision. I started yesterday and did 5 t+p papers and 5 trans papers untill 2 in morning... Then got up at 6 and had 3 red bulls. I literally learnt whole thing in 8 hours. I'm pleased I did now as it was all fresh in my brain.! I reckon def got A!
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    (Original post by Nazmoth)
    Maybe it was just effective revsision. I started yesterday and did 5 t+p papers and 5 trans papers untill 2 in morning... Then got up at 6 and had 3 red bulls. I literally learnt whole thing in 8 hours. I'm pleased I did now as it was all fresh in my brain.! I reckon def got A!
    Good for you
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    (Original post by Nazmoth)
    I'm pretty sure it was positive! Thermal decomposition requires heating so I guess more energy has to be put in. Also my Hess cycle was def right.

    If I put 109 for bond angle instead of 109.5 would they allow it? Got 80% Cu and koh was not in excess. 76.9% purity or something. Only thing I couldn't do on transition was to draw dxy and dx2-y2 although I have looked it up now! I got one of them right by luck. Grade boundaries have gotta be high because it was the easiest t+p I've seen!
    Grade boundries will vary depending on the option module. Seeing as though 'Transition Elements' paper was quite hard, I'm sure they stay around 78% for A, 69% for B and so on....
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    (Original post by Andy Conda)
    Grade boundries will vary depending on the option module. Seeing as though 'Transition Elements' paper was quite hard, I'm sure they stay around 78% for A, 69% for B and so on....
    Nice! I thought they would ussualy be 84% + cus these short ones are sooo much easier than organic! I will def get A!
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    does anyone remember what they put for the electrode potential answer. I got somthing like 0.37 i think. because you swap equation around so that reducing agent gets reduced etc anti clockwise rule basically, so i got 0.37
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    (Original post by asos89)
    does anyone remember what they put for the electrode potential answer. I got somthing like 0.37 i think. because you swap equation around so that reducing agent gets reduced etc anti clockwise rule basically, so i got 0.37
    what what what?
    i dont remember that question? was this on trends and patterns?
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    (Original post by asos89)
    does anyone remember what they put for the electrode potential answer. I got somthing like 0.37 i think. because you swap equation around so that reducing agent gets reduced etc anti clockwise rule basically, so i got 0.37
    Same here i got that!
 
 
 
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