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    (Original post by TeachChemistry)
    the weakest oxidising agent would be the strongest reducing agent and be the one with the most negative electrode potential

    The negative sign tells you the half equation doesn't want to go from left to right as written
    But if it's the strongest reducing agent then it goes from left to right ?

    Oh never mind, I got it thanks !
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    (Original post by AqsaMx)
    Attachment 541559Attachment 541559541561

    Anyone know how to work out the final species?
    V2+
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    (Original post by TeachChemistry)
    V2+
    Okay thank you !
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    Okay just did Jan f325 and got 80! However, the last question and the electrode potentials were confusing. Can someone help me understand how to answer question 7d. Here is a link:
    http://www.ocr.org.uk/Images/144762-...d-elements.pdf
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    (Original post by ToLiveInADream)
    Okay just did Jan f325 and got 80! However, the last question and the electrode potentials were confusing. Can someone help me understand how to answer question 7d. Here is a link:
    http://www.ocr.org.uk/Images/144762-...d-elements.pdf
    7d? Very tricky.
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    Anyone tried the Edexcel papers? Printed Jan 2016 Unit 4 and Unit 5. Which are more useful for our spec?
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    (Original post by Ss0)
    where can i find hard NMR questions? or if i can find any stretch and challenge chemistry questions in general?

    http://webspectra.chem.ucla.edu//

    http://www.chem.ucalgary.ca/courses/...opy/index.html

    http://www-usr.rider.edu/~grushow/nm..._fs_start.html

    http://www.chem.ucalgary.ca/courses/...isp/index.html

    There's more online if you look. I have used the first three and they're good. You just need to be careful not to go on the problems with additional spectra
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    When drawing optical isomers, does it matter you order the groups around the chiral centre???
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    Does anyone please have last years papers and mark schemes please???
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    (Original post by AqsaMx)
    When drawing optical isomers, does it matter you order the groups around the chiral centre???
    I don't really get your question sorry… If you're asking if the chiral carbon has to be in the middle then yes. IF you're asking about the way in which you draw the 3D lines connecting the 4 groups to central chiral carbon then the examiners generally accept two versions, the most common being the usual tetrahedral shape
    //
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    (Original post by nicoleemmak)
    Does anyone please have last years papers and mark schemes please???
    I have the mark schemes but not the actual papers :s
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    (Original post by ToLiveInADream)
    Okay just did Jan f325 and got 80! However, the last question and the electrode potentials were confusing. Can someone help me understand how to answer question 7d. Here is a link:
    http://www.ocr.org.uk/Images/144762-...d-elements.pdf
    Smh
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    anyone else enjoy the long acid and base questions on how to make a buffer and how it acts as one?
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    (Original post by itsConnor_)
    Anyone tried the Edexcel papers? Printed Jan 2016 Unit 4 and Unit 5. Which are more useful for our spec?
    I find AQA better than edexcel but even then I'd focus on legacy papers more than AQA.
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    (Original post by Hunnybeebee)
    anyone else enjoy the long acid and base questions on how to make a buffer and how it acts as one?
    They make me purr.
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    (Original post by AqsaMx)
    When drawing optical isomers, does it matter you order the groups around the chiral centre???
    I don't think it does, as long as the optical isomer you draw of it is essentially a mirror image of the one you drew originally
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    (Original post by Hunnybeebee)
    anyone else enjoy the long acid and base questions on how to make a buffer and how it acts as one?
    Omg yes

    So simple
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    So photosynthesis is an endothermic reaction and negative change in entropy. How is the reaction possible?
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    (Original post by thad33)
    So photosynthesis is an endothermic reaction and negative change in entropy. How is the reaction possible?
    Temperature is low enough for reaction to be feasible?

    Ignore that, I am daft

    Something to do with activation perhaps, but photosynthesis isn't one straightforward, simple reaction, there are numerous, numerous steps in involved so I'm guessing the answer is somewhere in there.
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    (Original post by Serine Soul)
    Temperature is low enough for reaction to be feasible?

    Ignore that, I am daft

    Something to do with activation perhaps, but photosynthesis isn't one straightforward, simple reaction, there are numerous, numerous steps in involved so I'm guessing the answer is somewhere in there.
    Yeah, plants are cool as ****
 
 
 
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