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

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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?
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?
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.
Original post by manisha98
What did you get for the enthalpy change of combustion calculations?


41.smthn
Original post by pondsteps
41.smthn


no i meant the calcucaltion with kjmol-1 and stuff
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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djmans
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did you guys find a thread for tomorrows physics unit 3
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
Original post by manisha98
no i meant the calcucaltion with kjmol-1 and stuff

Which one ? the page after the graph ?
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
Original post by CPSohan
Which one ? the page after the graph ?


calculating the enthalpy change . what did u get
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
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?
Original post by pondsteps
calculating the enthalpy change . what did u get

I forgot this. :s-smilie:
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
Original post by CPSohan
I forgot this. :s-smilie:


oh lol. but did u use the mass of alcohol to calculate the enthalpy change?
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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