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    (Original post by Zoeyyy)
    It was okay I guess.
    In the energy transferred question, was the mass 50 or 55? 😳
    Yes I have the same doubt. It was mentioned specific heat capacity of the "mixture"?
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    What was the answer for the question where they asked why sodium iodide cannot be used to make iodobutane?? (or something to that effect)

    Also what was the answer to the very last question..why the above process is not used to produce...something...can't remember what!!!
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    (Original post by StUdEnTIGCSE)
    Yes I have the same doubt. It was mentioned specific heat capacity of the "mixture"?
    50
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    (Original post by Munchee)
    What was the answer for the question where they asked why sodium iodide cannot be used to make iodobutane?? (or something to that effect)

    Also what was the answer to the very last question..why the above process is not used to produce...something...can't remember what!!!
    Hydrogen Iodide has enough reducing power to reduce Concentrated Sulfuric acid so yield would be lower.
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    (Original post by sahashuvo)
    Hydrogen Iodide has enough reducing power to reduce Concentrated Sulfuric acid so yield would be lower.
    A reverse argument is also possible right?

    Since all the HI is oxidised to I2 by conc. Sulfuric acid.

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    What were your answers to the following questions?

    Enthlapy in KJ/mol of CuSO4

    %error and max temp difference

    When HCL was added to KI-observation

    Using the same equipment,and a stop clock explain how the accuracy of the experiment could be increased by recording a more accurate temperature difference,considering the same volume of 1 mol/dm^3 CuSO4 and 5g Zinc(4marks)

    1-chlorobutane was produced from butan-1-ol by reacting it with PCl5.The products were HCl and POCL(maybe)

    explain why 1-chlorobutane cannot be produced industrially by this reaction
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    What was the answer to the first question? the formula of the first solid?
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    What did you write for the observation that you would look for to know that there is no more iodine?


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    (Original post by awesomesoccerfan)
    What were your answers to the following questions?

    Enthlapy in KJ/mol of CuSO4

    %error and max temp difference

    When HCL was added to KI-observation

    Using the same equipment,and a stop clock explain how the accuracy of the experiment could be increased by recording a more accurate temperature difference,considering the same volume of 1 mol/dm^3 CuSO4 and 5g Zinc(4marks)

    1-chlorobutane was produced from butan-1-ol by reacting it with PCl5.The products were HCl and POCL(maybe)

    explain why 1-chlorobutane cannot be produced industrially by this reaction
    My enthalpy was around 914 kj and for my error i did 0.5/ my temp diff which was around 46. My error was 1.08%
    hope that helps
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    (Original post by KhawlaM)
    What did you write for the observation that you would look for to know that there is no more iodine?


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    You check and make sure that there is no shiny bluish black solid is visible.
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    (Original post by examman123)
    You check and make sure that there is no shiny bluish black solid is visible.
    Oh, I wrote that the brown color of the solution will disappear.


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    (Original post by rockstar101)
    My enthalpy was around 914 kj and for my error i did 0.5/ my temp diff which was around 46. My error was 1.08%
    hope that helps
    My enthalpy was -194KJ/mol my error was 2.2% and temp diff was 47'C
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    (Original post by KhawlaM)
    What did you write for the observation that you would look for to know that there is no more iodine?


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    Not no more iodine the question was very less iodine or something if not what's the use of the thiosulfate solution?
    Iodine dissolves in the organic solvent giving a violet purple colour. So that colour should fade away.
    right?

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    (Original post by StUdEnTIGCSE)
    Not no more iodine the question was very less iodine or something if not what's the use of the thiosulfate solution?
    Iodine dissolves in the organic solvent giving a violet purple colour. So that colour should fade away.
    right?

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    You are probably right. I forgot about the organic solvent, so I wrote instead that the brown color will disappear :s


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    (Original post by awesomesoccerfan)
    My enthalpy was -194KJ/mol my error was 2.2% and temp diff was 47'C
    OK our entalpy was the same and also temp diff. I just used 0.5 for my error not 1 maybe that y. Do u know if we r to use 1 or 0.5. And dw ull do great
    btw pls gimmie a rep?
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    (Original post by rockstar101)
    OK our entalpy was the same and also temp diff. I just used 0.5 for my error not 1 maybe that y. Do u know if we r to use 1 or 0.5. And dw ull do great
    btw pls gimmie a rep?
    Error x2
    Therefore error is 1.

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    (Original post by StUdEnTIGCSE)
    Not no more iodine the question was very less iodine or something if not what's the use of the thiosulfate solution?
    Iodine dissolves in the organic solvent giving a violet purple colour. So that colour should fade away.
    right?

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    How many marks was that? Damn I said black solid disappears. Totally forgot iodine forms a purple solution with non polar solvents

    Maybe they will mark both since all iodine will not dissolve?

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    (Original post by awesomesoccerfan)
    My enthalpy was -194KJ/mol my error was 2.2% and temp diff was 47'C
    Yep. That is what I got. % error = 2.15? And you rounded it to 2.2?

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    what were the observations for that iodobutane one and do you think they would give the marks for writing the equation of phosphorus with iodine without balancing
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    (Original post by wbrian)
    what were the observations for that iodobutane one and do you think they would give the marks for writing the equation of phosphorus with iodine without balancing
    Black solid formed.
    Yellow solid formed.

    1 mark for balancing usually.

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