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    Do we need to know the structure of EDTA4- for this exam?
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    (Original post by BossmanYabz)
    Anyone know where I can find the grade boundaries for the CHEM5 specimen paper?
    It should be here: A-level-mark-converter.xlsx
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    (Original post by BossmanYabz)
    Anyone know where I can find the grade boundaries for the CHEM5 specimen paper?
    the specimen paper doesnt hqve grade boundaries :-)

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    (Original post by BerryB)
    Do we need to know the structure of EDTA4- for this exam?
    No, in past papers they have allowed you to use EDTA4- as its formula.
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    (Original post by 16dan2life)
    Most likely deltaG will remain constant
    what happens when delta g remains constant?
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    if we were asked for the colour of aqueous chromium, would it be ruby or green? cos the book says you rarely see the ruby colour?
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    you don't get full marks for a correct final answer in calculations do you?? should you aim to round to 3 sig figures during calculations?
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    (Original post by Allahu Akbar)
    It should be here: A-level-mark-converter.xlsx
    Thanks for the link, doesn't seem to work for Specimen papers though
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    (Original post by BerryB)
    Do we need to know the structure of EDTA4- for this exam?

    Doubt it - though they have asked for the structure for ethandioate....
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    (Original post by samfreak)
    the specimen paper doesnt hqve grade boundaries :-)

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    Would explain a bit lol, 77 probably a low a right?
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    (Original post by gingerandice)
    you don't get full marks for a correct final answer in calculations do you?? should you aim to round to 3 sig figures during calculations?


    Definitely.

    All through Unit 1-4 they seem to want at least 3 significant figures, can't go wrong!
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    (Original post by gooner1886)
    Doubt it - though they have asked for the structure for ethandioate....
    I think we just need to remember that it is hexadentate
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    (Original post by dizzy17)
    if we were asked for the colour of aqueous chromium, would it be ruby or green? cos the book says you rarely see the ruby colour?
    Ruby is in my book as well, but it is more commonly seen as green because the water ligands are easily substituted for others. Probably get the mark for either
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    (Original post by Allahu Akbar)
    It should be here: A-level-mark-converter.xlsx
    That's Edexcel
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    Would anyone be able to help me with ionic equations, I understand that you have to remove spectator ions then balance charges, but I have trouble identifying the spectator ions :confused:

    E.g. June 2011 4 (e) (ii)
    "Write an ionic equation in each case to show how aluminium oxide reacts with hydrochloric acid and with sodium hydroxide" - how do you know the states of the reactants and products?
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    (Original post by Emfasis)
    Would anyone be able to help me with ionic equations, I understand that you have to remove spectator ions then balance charges, but I have trouble identifying the spectator ions :confused:

    E.g. June 2011 4 (e) (ii)
    "Write an ionic equation in each case to show how aluminium oxide reacts with hydrochloric acid and with sodium hydroxide" - how do you know the states of the reactants and products?
    Well if it's ionic you know that all species are represented as ions so they're all aqueous.
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    Why are chelates more stable than normal metal-aqua ions?
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    (Original post by BerryB)
    Why are chelates more stable than normal metal-aqua ions?
    What I have attached may help.
    Attached Images
     
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    (Original post by gingerandice)
    what happens when delta g remains constant?
    if it remains constant at a positive value = reaction not feasible
    if it remains constant at a negative value = reaction is feasible
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    (Original post by Zytex)
    What I have attached may help.
    oh okay, thanks!! But why does an increase in entropy cause an increase in stability?
 
 
 
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