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Edexcel IAL Chemistry Unit 3 WCH03 May June 2016 Discussion Watch

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    Did any of you also find the test hard compared to previous years?
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    What was the test for iodine?

    First I put down dilute hno3, then agn03 gives yellow ppt
    But I changed it to add h2so4, purple fumes
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    and -1225 for graph
    For iodine ATOM it was add conc. H2SO4 and result was rotten egg smell from H2S
    I got carbonate ion wrong,As a result the equation was wrong.
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    (Original post by Blazyy)
    What was the test for iodine?

    First I put down dilute hno3, then agn03 gives yellow ppt
    But I changed it to add h2so4, purple fumes
    I put add warm sodium hydroxide, then add dilute nitric acid and agno3 to give yellow ppt.
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    (Original post by OnTheHorizon)
    -418 Kj/mol
    and 41%
    how come its -418

    I did 400g for the water?? and 1.65g for the hydrocarbon

    and did all workout and i got -393
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    (Original post by don't cry-craft)
    Did any of you also find the test hard compared to previous years?
    It was not extremely harder, but the overall thing was different for sure. They have changed the 'design' of the exam.

    I can't be sure about the 41% answer, why do we divide by the larger number and not the 800? Can someone explain? I also did 41% but it's annoying me.
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    (Original post by OnTheHorizon)
    and -1225 for graph
    For iodine ATOM it was add conc. H2SO4 and result was rotten egg smell from H2S
    I got carbonate ion wrong,As a result the equation was wrong.
    I know I'm so annoyed about the carbonate one. That's like 3 marks
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    (Original post by don't cry-craft)
    Did any of you also find the test hard compared to previous years?
    Yeah it was very different,The usual fill in the blanks was not there and the long paragraph question about alcohols was not there
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    (Original post by don't cry-craft)
    Did any of you also find the test hard compared to previous years?
    yh it was a completely different paper which i didnt expect. I hate my luck.
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    (Original post by Electrify)
    It was not extremely harder, but the overall thing was different for sure. They have changed the 'design' of the exam.

    I can't be sure about the 41% answer, why do we divide by the larger number and not the 800? Can someone explain? I also did 41% but it's annoying me.
    Yeah I agree, it was definitely different which took me by surprise.
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    (Original post by Hamadtype-)
    how come its -418

    I did 400g for the water?? and 1.65g for the hydrocarbon

    and did all workout and i got -393
    I got the moles by 1.65/Molar mass of CH3OH and then enthalpy change by energy/moles
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    (Original post by Electrify)
    It was not extremely harder, but the overall thing was different for sure. They have changed the 'design' of the exam.

    I can't be sure about the 41% answer, why do we divide by the larger number and not the 800? Can someone explain? I also did 41% but it's annoying me.
    because the equation is the error/result * 100
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    Do you think the grade boundaries this year will be lower or not?
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    (Original post by OnTheHorizon)
    I got the moles by 1.65/Molar mass of CH3OH and then enthalpy change by energy/moles
    Yeah thats what I did, but got like -393
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    I would say A would be at 32,That's my guess.
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    (Original post by OnTheHorizon)
    I would say A would be at 32,That's my guess.
    32/50?!

    Then I'm pretty sure I would get an A.
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    (Original post by OnTheHorizon)
    I would say A would be at 32,That's my guess.
    Naa mate, last year 31 was A and paper was easier, so I think 29 is A
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    (Original post by Hamadtype-)
    Yeah thats what I did, but got like -393
    How so?
    1.65/32=Ans 1
    Change=Energy/Ans 1=Ans 2
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    What did you guys wrtie in that question in which we had to convert G TO F?
    I wrote that reagent = potassium hydroxide
    Condition = alcoholic
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    Last year it was 33/50 for an A, and I felt last year's paper was easier than today's.
 
 
 
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