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    What do you guys think the grade boundaries will be if A was 63 in Jan 2016?
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    (Original post by I <3 WORK)
    Hey thanks so much for this! Can I just ask, you know for the MCQ about Maxwell Distribution curve, wasn't the question about what would happen if temperature increased? Because in that case the peak would move down and right. Also for the ionic equation of Ag+I- did it say that you have to include state symbols?
    For the maxwell one i am very sure it said decreased. Yes that was an error in the answer. As i said before cannot guarantee what's right.
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    (Original post by Electrify)
    The question about group 2 solubilities clearly said ascended, not descended. So it should be hydroxides decrease, sulfates increase.
    Sorry about that. yeah you are right
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    (Original post by anujsr)
    For the maxwell one i am very sure it said decreased. Yes that was an error in the answer. As i said before cannot guarantee what's right.
    What about the reaction to form butylamine - I'm pretty sure Ammonium Iodide is formed not HI?
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    (Original post by I <3 WORK)
    What about the reaction to form butylamine - I'm pretty sure Ammonium Iodide is formed not HI?
    I remember it saying that it was butylamine or something FURTHER reacts. Remember. first it forms RNH2 then R2NH and then R3N. so R2NH was the answer needed. the quartinary salt would have been formed if they said that it was R2NH finally. R is the carbon chain. SO HI and the second amine forms.
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    (Original post by anujsr)
    I remember it saying that it was butylamine or something FURTHER reacts. Remember. first it forms RNH2 then R2NH and then R3N. so R2NH was the answer needed. the quartinary salt would have been formed if they said that it was R2NH finally. R is the carbon chain
    No I mean as in the first part of the question was like it reacts with ammonia to form butylamine and you had to write the reaction, so Ammonium Iodide will be another product.

    Basically like this:

    1-Iodobutane + 2NH3 --> butylamine + NH4I
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    (Original post by I <3 WORK)
    No I mean as in the first part of the question was like it reacts with ammonia to form butylamine and you had to write the reaction, so Ammonium Iodide will be another product.

    Basically like this:

    1-Iodobutane + 2NH3 --> butylamine + NH4I
    I am not really sure and was quite tired after the exam. So maybe you might be right. However, what's done is done, you can't change it now.
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    We can all agree this was a **** paper?

    Posted from TSR Mobile
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    The solvents are not used because there r solvents available now that can dissolve both polar and non polar substances as they have the properties of both atleast thats what i wrote. The paper was messed up might loose around 10 12 marks i really hope the grade boundaries r like june 15 or atleast anything lower than january 16.
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    (Original post by Tayyabshabbirtsr)
    The solvents are not used because there r solvents available now that can dissolve both polar and non polar substances as they have the properties of both atleast thats what i wrote. The paper was messed up might loose around 10 12 marks i really hope the grade boundaries r like june 15 or atleast anything lower than january 16.
    No they are not used because they cause ozone depletion, which they produce free radicals
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    (Original post by Sandy_Vega30)
    Molecular ion peak is 3.
    IR spectra produced belonged to propanone.
    Mass of Iodine 114.2g.
    Percentage Uncertainty: 1%
    Sodium Sulfate moles : 0.33 (not sure of the answer).
    Structure of Cl2O7 : Google it. Its on wikipedia.

    Paper was not that bad. What was the White solid produced at step 3? I wrote BaO.
    no it wasn't BaO
    in the question it was written that when the Barium nitrate is heated, a solid forms. then that solid melts and BaO, NO2 and O2 are produced. so that white solid was anhydrous barium nitrate
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    (Original post by Hamadtype-)
    No they are not used because they cause ozone depletion, which they produce free radicals
    they cause cancer too
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    (Original post by ToxicPhantom007)
    they cause cancer too
    Are they toxic?

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    (Original post by AlvlVictim)
    Are they toxic?

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    yes
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    (Original post by Hamadtype-)
    No they are not used because they cause ozone depletion, which they produce free radicals
    Damn that was so simple another mark gone:/
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    I did soooooooooo welllllllll i love chemistry!!!!!!!!! In the start of the year i was sh***ing my self about chemistry now im in safe zone!!!!!!!!!!
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    (Original post by Hamadtype-)
    yes
    I wrote its toxic

    Posted from TSR Mobile
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    Well no longer used because of better solvents should be reason enough(Though I admit kinda flimsy).There's bound to be multiple answers for that question.
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    (Original post by notsoclueless)
    I wrote that it was trigonal with an angle of 107 degrees

    and dammit ~.~ it's supposed to be pyramidal knew i messed up somewhere
    i wrote trigonal planner angle 120
    second one did the question ask to name it
    i didnot name it i put the angle 104.5
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    how hard was the exam
    section a was very tricky
    i felt i had enough time at the end to revise
 
 
 
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