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    I am retaking my AS quantitative and evaluative ISA this year, and have been told the topics are enthalpy for quant and 'The preparation of an organic liquid' for evaluative. Just wondering if anyone would be able to suggest any key topics to revise, questions to look out for, questions people have remembered in the past on these topics...etc.

    Any help would be greatly appreciated guys! really want to get an A this time round!! Thanks
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    (Original post by shaz996)
    I am retaking my AS quantitative and evaluative ISA this year, and have been told the topics are enthalpy for quant and 'The preparation of an organic liquid' for evaluative. Just wondering if anyone would be able to suggest any key topics to revise, questions to look out for, questions people have remembered in the past on these topics...etc.

    Any help would be greatly appreciated guys! really want to get an A this time round!! Thanks
    Hey, I see you had no luck with a reply, but I was wondering if you had done any of them yet, and if possible can you suggest what to look out for?
    Thanks x
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    yeah the quantitiave is on enthalpy and you have to record masses of your experiment work out mass of Mg used and take temperature of HCL before and after exp and work out temp change. The experiment is adding (part 1) strip of solid Mg to HCL and part 2 is adding solid MgO to HCL. You are required to also work out the mass of solution.
    Then you do percentage error, then you have to work out heat given out ( Q= MCΔT) the M will be mass of solution , then you work out the moles of Mg ( mass/molar mass), then you work out enthalpy change of experiment : heat given out/moles. (Q/n).

    You repeat this with the next experiment using MgO. Same recording of mass temp ect and same analysis questions on heat given out, moles and enthalpy.

    Third part of Quantitative OCR AS ISA is using your enthalpy values from part 1 and part 2 to fill out an enthalpy cycle. They give you the cycle and you just have to fill in the values.

    You are then asked to work out enthalpy change of formation of MgO ( JUST FOLLOW ARROWS) .
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    I did the quantitative ISA yesterday, so if anyone knows what comes up on the evaluative ISA 2015 for OCR please let me know.
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    (Original post by madmike786)
    I did the quantitative ISA yesterday, so if anyone knows what comes up on the evaluative ISA 2015 for OCR please let me know.
    I've got my Eval. tomorrow! Would really be helpful to know what questions come up!
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    Formation of MgO , just follow the arrows, cant remember equation sorry.
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    also did the evaluative ISA if anyone wants to know whats on it.
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    (Original post by madmike786)
    also did the evaluative ISA if anyone wants to know whats on it.
    which one did you do? x
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    I want to know!! I have it tomorrow!!
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    Please someone who did the Evaluative could tell me what's in there?
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    PLEASE help me with :

    KETONE AS CHEMISTRY Evaluative

    Cheers
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    (Original post by madmike786)
    also did the evaluative ISA if anyone wants to know whats on it.
    Hey, what evaluative did you do? If preparing an organic liquid could you help me out? Thank you very much.
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    (Original post by KingThomas)
    PLEASE help me with :

    KETONE AS CHEMISTRY Evaluative

    Cheers
    I've done it. Have you done the evaluative on enthalpy?
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    (Original post by madmike786)
    also did the evaluative ISA if anyone wants to know whats on it.

    (Original post by Kautar)
    I want to know!! I have it tomorrow!!

    (Original post by Kautar)
    Please someone who did the Evaluative could tell me what's in there?

    (Original post by suzie1234)
    Hey, what evaluative did you do? If preparing an organic liquid could you help me out? Thank you very much.
    http://www.thestudentroom.co.uk/anno...p?f=130&a=1535
 
 
 
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