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    (Original post by StUdEnTIGCSE)
    Yes its there BUT NOT with Tollens or fehlings reagents. This might be an accepted alternative.
    But
    You could distinguish by a refluxing with acidified Potassium Di Chromate (or manganate if you take necessary precautions). Colourchange will only show up for aldehyde.
    Tollens solution or fehling is also good but out of the spec.

    Similarly distinguishing between carboxylic and aldehyde or ketone can be done by litmus.

    I dont know. where in the spec is Tollens reagent and Fehling's mentioned????
    I suppose your right. I didn't check the spec, but my tutor taught it, so I assumed it was in the spec...

    Hope we don't get something new like that
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    Carbonyl compounds are with C to O double bond as in ketone aldehyde and carboxylics acid. The Fehling's and Tollen's is in A2. Maybe Thilak would have added it.



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    (Original post by StUdEnTIGCSE)
    Carbonyl compounds are with C to O double bond as in ketone aldehyde and carboxylics acid. The Fehling's and Tollen's is in A2. Maybe Thilak would have added it. Here


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    Haha, he always teaches extra and finishes syllabus slowly
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    (Original post by StUdEnTIGCSE)
    How to investigate the solubility of simple molecules in different solvents?

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    Is this in the spec? :eek:

    How do you measure solubility? increase in volume? (very doubtful)
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    (Original post by Relaxedexams)
    Is this in the spec? :eek:

    How do you measure solubility? increase in volume? (very doubtful)
    man please help me in the questions i sent
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    (Original post by Daniel Atieh)
    pleeeeassse help me in Jun 2009 q 1 (aiv) and b(v)....didnt get AT ALL!!! http://www.edexcel.com/migrationdocu...e_20090515.pdf
    1 (a) (iv)

    White ppt is formed, the new substance is Magnesium Hydroxide. (I did this in class, not sure if its in the syllabus.)

    (b) (v)

    The sulfur in H2SO4 is reduced to Sulfur dioxide. Bromine in HBr is oxidised to Br2.
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    (Original post by Relaxedexams)
    1 (a) (iv)

    White ppt is formed, the new substance is Magnesium Hydroxide. (I did this in class, not sure if its in the syllabus.)

    (b) (v)

    The sulfur in H2SO4 is reduced to Sulfur dioxide. Bromine in HBr is oxidised to Br2.
    also for q 2 part ai - why we hv to draw the line at 3.5 mins? is it cauz at the mid?
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    (Original post by StUdEnTIGCSE)
    Carbonyl compounds are with C to O double bond as in ketone aldehyde and carboxylics acid. The Fehling's and Tollen's is in A2. Maybe Thilak would have added it.



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    In simple distillation, the 'receiving end of the flask' is the end at the conical flask right?
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    (Original post by Daniel Atieh)
    also for q 2 part ai - why we hv to draw the line at 3.5 mins? is it cauz at the mid?
    In the question, its given that Zn powder is added at exactly 3.5 mts, so the vertical line is drawn from there to get the cooling correction.
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    (Original post by Relaxedexams)
    In the question, its given that Zn powder is added at exactly 3.5 mts, so the vertical line is drawn from there to get the cooling correction.
    aha yess thx! I hv solved 4 papers! I dunno what to do nw? any suggestion?
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    (Original post by Daniel Atieh)
    aha yess thx! I hv solved 4 papers! I dunno what to do nw? any suggestion?
    Solve all the remaining papers. Go through the notes in the first post.
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    Lolz am I late??


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    (Original post by NilFBosh)
    Lolz am I late??


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    Late for what? :confused:

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    (Original post by Relaxedexams)
    Solve all the remaining papers. Go through the notes in the first post.
    Man check for me also jan 2013 q 1 aiv.....shudnt the colour be blue-blacK???
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    Is it alright to draw the graph in pencil for the actual exam?
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    Thank you so much to all of you :
    leafy9
    Relaxedexams
    Sweet Strawberry (funny name you got )
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    (Original post by kevsamuel)
    Is it alright to draw the graph in pencil for the actual exam?
    Yh its totally fine to draw in pencil. are you guys nervous??
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    (Original post by Relaxedexams)
    Late for what? :confused:

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    I missed all the conversations


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    ANY ONEEE PLZ i need help in jan 2013 q 1 aiv ---why the color is not blue-black ..
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    What are the procedures in the preparation of dry crystals of a salt?? Can someone please help me!
 
 
 
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