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    (Original post by nicoleemmak)
    When you drew the structure of the fragment peaks did you have to put + signs???
    yep i think u do, i got 1 h2c=chch2+ and other one i forgot.
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    (Original post by Saywhatyoumean)
    Also I got -281 for the enthalpy question I think I did something wrong :/


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    I got that too
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    (Original post by cyborgom)
    yep i think u do, i got 1 h2c=chch2+ and other one i forgot.
    was it not ch3chch2+?
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    Carbon was like 32percent or whatever. Divide that buy 100 x 150 = 48
    48/12 = 4
    And I got overall mr as 136.9
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    What was the mass of excess magnesium ?

    I got 0.302 something like that

    25% + mass of magnesium no?


    But my mates said it was 25% + mass of the other metal which gave the mass of excess magnesium
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    (Original post by mattyk5)
    was it not ch3chch2+?
    im not sure....:confused::confused::confused:
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    i thought it was quite a fair paper just didnt like the petrol question ...and didnt get to finish the last 2 mark question as ran out of time but other than that thought it was quite good did anyone else run out of time ?
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    (Original post by leobrave)
    Carbon was like 32percent or whatever. Divide that buy 100 x 150 = 48
    48/12 = 4
    And I got overall mr as 136.9
    i think they said less than 150
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    (Original post by cyborgom)
    im not sure....:confused::confused::confused:
    no sorry youre right, i just got confused. I got the same as you
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    (Original post by leobrave)
    Carbon was like 32percent or whatever. Divide that buy 100 x 150 = 48
    48/12 = 4
    And I got overall mr as 136.9
    You work out the molecular formula straight away which was c3h7br , I'm pretty sure that's what I got
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    (Original post by mercuryman)
    What was the mass of excess magnesium ?

    I got 0.302 something like that

    25% + mass of magnesium no?


    But my mates said it was 25% + mass of the other metal which gave the mass of excess magnesium
    yh i did 25% of the mass and then add it on. So i got like 0.31 (2 decimal place because it said it had a 2dp weighing scale or something)
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    (Original post by mattyk5)
    no sorry youre right, i just got confused. I got the same as you
    thank god
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    But which mass ???

    that's what I'm baffed about lol

    Surely it was mass of mg right?
    (Original post by mattyk5)
    yh i did 25% of the mass and then add it on
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    (Original post by mercuryman)
    But which mass ???

    that's what I'm baffed about lol

    Surely it was mass of mg right?
    yes mass of Mg
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    (Original post by mercuryman)
    What was the mass of excess magnesium ?

    I got 0.302 something like that

    25% + mass of magnesium no?


    But my mates said it was 25% + mass of the other metal which gave the mass of excess magnesium
    Would you not have done moles of the other thing x125 then worked out the mass from that
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    (Original post by mattyk5)
    was it not ch3chch2+?
    I FORGOT THE +!!!!! NOOOOO...think i will still get 2/3 marks?
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    What do we think the boundary for an A grade will be?
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    (Original post by bakedbeans247)
    I FORGOT THE +!!!!! NOOOOO...think i will still get 2/3 marks?
    yh i think you lose one mark for the "+"
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    I worked out 25%of the moles of mg, then added it to original moles of mg and then worked out the mass of it.
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    (Original post by bakedbeans247)
    I FORGOT THE +!!!!! NOOOOO...think i will still get 2/3 marks?
    I'm pretty sure I've seen this in a mark scheme, so 2/3 I'd say for sure.
 
 
 
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