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Edexcel IAL Chemistry (WCH06/01) Chemistry Laboratory Skills II - 10th May 2016 watch

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    (Original post by CPSohan)
    -1st and 2nd were not valid , 3rd and 4th were valid.
    - Test for presence of Iodine , which came today in exam , is actually the test for halo-alkane. Hot NaOH(aq.)+ dil.HNO3+ AgNO3 -------------------------------> yellow precipitate forms, showing the presence of I-
    do u remember what they were?? the suggestions?
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    I wrote fractionating column

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    Yellow ppt and your method is correct

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    What did you get for the enthalpy change of combustion calculations?
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    (Original post by wima3109)
    atleast 30 would be okay....
    I share your sentiments

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    (Original post by pondsteps)
    great! but all i wrote was add NaOH then nitric acid the silver nitrate and yellow ppt forms.. is it correct??
    Yes.
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    (Original post by manisha98)
    What did you get for the enthalpy change of combustion calculations?
    41.smthn
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    (Original post by pondsteps)
    41.smthn
    no i meant the calcucaltion with kjmol-1 and stuff
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    (Original post by pondsteps)
    do u remember what they were?? the suggestions?
    Yeah I do, first and second were mass and temperature uncertainties . Third and fourth were heat loss and incomplete combustion.
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    did you guys find a thread for tomorrows physics unit 3
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    (Original post by manisha98)
    no i meant the calcucaltion with kjmol-1 and stuff
    oh it was 418 smthn like that..any one got like me
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    (Original post by manisha98)
    no i meant the calcucaltion with kjmol-1 and stuff
    Which one ? the page after the graph ?
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    (Original post by CPSohan)
    Yeah I do, first and second were mass and temperature uncertainties . Third and fourth were heat loss and incomplete combustion.
    no i guess the first was both mass and temp uncertanities put as one point
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    (Original post by CPSohan)
    Which one ? the page after the graph ?
    calculating the enthalpy change . what did u get
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    (Original post by pondsteps)
    no i guess the first was both mass and temp uncertanities put as one point
    No. Then what were the rest 3 points tell
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    (Original post by pondsteps)
    oh it was 418 smthn like that..any one got like me
    i got 400smth but for the previous question the one above it what did u get?
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    (Original post by pondsteps)
    calculating the enthalpy change . what did u get
    I forgot this.
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    (Original post by manisha98)
    i got 400smth but for the previous question the one above it what did u get?
    tbh i dont remember it was a long number
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    (Original post by CPSohan)
    I forgot this.
    oh lol. but did u use the mass of alcohol to calculate the enthalpy change?
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    (Original post by pondsteps)
    tbh i dont remember it was a long number
    Did you not forget to put a negative sign on there ? :P
 
 
 
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