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OCR Chemistry A Exam Thread (Breadth - May 27 2016 and Depth - June 10 2016) Watch

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    Found that really hard
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    (Original post by kiwifruit99)
    Found that really hard
    Me Too :/

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    I found it quite easy - except the very last question
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    Best chemistry exam ive hever done 😃😃 absolutely buzzing but i think grade boundaries will be high around 90%
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    Anyone get 29. Something for the enthalpy change of reaction? I think it might be 58 ,


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    That was the hardest test Ive ever done. How are people saying they liked it? wtf?
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    (Original post by A Sajid)
    If Kc constant comes up im just going to walk out the exam I swear.
    hahahahahahaha lol at your life
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    (Original post by A Sajid)
    That was the hardest test Ive ever done. How are people saying they liked it? wtf?
    It was easy, in chemistry they just serveeverything on a plate, the question are work the number of electrons, protons, neutrons in this ? Etc.. What type of reaction is this, how many volumes of gas produced, use the 2 formulas, so easy, anyone can do it


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    I got -58.5 kJ mol-1 I think
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    Was everyone else doing the same test as me then? 😂 i thought it was easy
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    (Original post by Fish40)
    It was easy, in chemistry they just serveeverything on a plate, the question are work the number of electrons, protons, neutrons in this ? Etc.. What type of reaction is this, how many volumes of gas produced, use the 2 formulas, so easy, anyone can do it


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    If anyone could do it, it would be a mickey mouse a-level..?
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    (Original post by connorhill)
    hahahahahahaha lol at your life
    Ive had enough of this sh. Im just gonna trap. Allow A levels. I aint made for this.
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    (Original post by Jitesh)
    I got -58.5 kJ mol-1 I think
    I'm an idiot, didn't write a minus, so you divided your q by 0.075 mol and not 0.150mol, why?


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    (Original post by Fish40)
    Anyone get 29. Something for the enthalpy change of reaction? I think it might be 58 ,


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    100cm3 I think you had to use (100g)
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    (Original post by Jitesh)
    I got -58.5 kJ mol-1 I think
    How were you meant to work out that qs? I've only ever dkne parctise questions were i worked out the moles for water.
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    (Original post by Jitesh)
    100cm3 I think you had to use (100g)
    Yes I had that, but divided my q=4.736 KJ or something by 0.150


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    (Original post by Nettled)
    How were you meant to work out that qs? I've only ever dkne parctise questions were i worked out the moles for water.
    Not 100% sure but it was something like q=100x4.18x10.5

    It said one of the things was in excess

    Then divide q by 1000 then the mols of something

    Not sure if it's right btw
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    What did they mean by use a different symbol for oxygen and what did we have to do
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    For the enthalpy change of reaction one i got confused - mainly regarding how many moles i had to divide the energy released by. For combustion u take the moles of the thing being combusted, for neutrilisation u take the moles of water, and for formation u take the compound. What on earth do u take for reaction?
 
 
 
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