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    The average GB for this exam for an A is approx 75/100 ... According to recent papers I would say that it would be max 75/100 for this one for an A

    Lower if anything...
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    About the ozone one, I said because ozone levels were really low so they though it was an error
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    (Original post by Kira Yagami)
    The average GB for this exam for an A is approx 75/100 ... According to recent papers I would say that it would be max 75/100 for this one for an A

    Lower if anything...
    Have to remember that only yr13's sat this exam though. Were there a lot of ppl resisting at your guys' centres?


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    (Original post by fudgeboy989)
    Have to remember that only yr13's sat this exam though. Were there a lot of ppl resisting at your guys' centres?


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    A few. I'm a private candidate... I know they were all retakes but still. this paper was slightly harder than previous years and the last 2 years an A was 72/74
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    for the mass of carbon dioxide, why is the 1:60 mol ratio of carbon:carbon dioxide wrong?

    also how did people tackle that mean propene and ozone structural formula equation...i spent quite a while on that one

    for the e/z isomers i dont remember them asking us to name the structures did they? i just wrote E and Z :/
    also why would the isomers of but-2-ene have different names

    for the co2 ir spec. i said that the carbon-oxygen bond absorbs a specific frequency of ir which causes its bonds to vibrate more. freq of ir absorbed is displayed on an ir spectrum. fingerprint region is region below 1500cm-1,which is specific to co2. the fingerprint region of sample ir specs can be compared with database value to identify co2.
    but then they asked about the fingerprint region, which made me doubt my answer to this question completely.

    what did everyone put for the processes in which radicals are involved. i named photochemical smog formation and ozone depletion.

    and did the very last part of the last question seem like comprehension, or was it just me?
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    (Original post by emfs)
    for the mass of carbon dioxide, why is the 1:60 mol ratio of carbon:carbon dioxide wrong?

    also how did people tackle that mean propene and ozone structural formula equation...i spent quite a while on that one

    for the e/z isomers i dont remember them asking us to name the structures did they? i just wrote E and Z :/
    also why would the isomers of but-2-ene have different names

    for the co2 ir spec. i said that the carbon-oxygen bond absorbs a specific frequency of ir which causes its bonds to vibrate more. freq of ir absorbed is displayed on an ir spectrum. fingerprint region is region below 1500cm-1,which is specific to co2. the fingerprint region of sample ir specs can be compared with database value to identify co2.
    but then they asked about the fingerprint region, which made me doubt my answer to this question completely.

    what did everyone put for the processes in which radicals are involved. i named photochemical smog formation and ozone depletion.

    and did the very last part of the last question seem like comprehension, or was it just me?
    Am I right in saying the general formula (or whatever it said) and the functional group for:

    distil was -COH and Aldehyde

    reflux was -COOH and Carboxylic acid?
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    (Original post by KINGYusuf)
    Am I right in saying the general formula (or whatever it said) and the functional group for:

    distil was -COH and Aldehyde

    reflux was -COOH and Carboxylic acid?
    thats what i put - hope so!
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    Yes - I put that too!
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    (Original post by KINGYusuf)
    Am I right in saying the general formula (or whatever it said) and the functional group for:

    distil was -COH and Aldehyde

    reflux was -COOH and Carboxylic acid?
    Is that alright if I put CxHx COH and CxHx COOH rather than just functional group?I didn't read the question carefully ,omg...
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    (Original post by AlbertoMerckx)
    I was well of the mark for this one, created an equation of C60 + 60 O2--> 60CO2 and ended up with answer of 190g xD
    That's the answer I got, it makes sense
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    (Original post by _MAT_)
    That's the answer I got, it makes sense
    Same - I'm pretty sure 190 is correct


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    Yeah i got 190 how did everyone else get 3. Something
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    (Original post by dansag)
    Yeah i got 190 how did everyone else get 3. Something
    How did you do it?
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    few I got a little worried there, especially by the conservation of mass, How could you end up with less mass then what you started with?
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    (Original post by KINGYusuf)
    How did you do it?
    U have to find the moles of c60 first which is mass/M, so 51/12(60) = 0.0708 moles. Then the molar ratio of c60 to co2 is 1:60, so multiply the moles by 60 = 4.25. Then mass = moles*M, so 4.25*44= 187.


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    What did everyone write for the polluting effect of CO2?
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    For the other radical reactions, I put formation of sulphuric acid as one, and formation of nitric acid as the other mark? The biradical (*CH2OO*) reacts with SO2/NO2 which goes onto create SO3/NO3, these go onto to form their respective acids. Would that get me the marks?
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    (Original post by KINGYusuf)
    How did you do it?
    C60 --> 60CO2

    (Since the number of carbons is equal to the number of CO2 molecules that are made)

    Work out number of moles of C60

    Mole ratio 1:60 so multiply number of moles by 60 and then divide by mr and put to 2sf
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    (Original post by KINGYusuf)
    What did everyone write for the polluting effect of CO2?
    Greenhouse gas
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    (Original post by AlbertoMerckx)
    For the other radical reactions, I put formation of sulphuric acid as one, and formation of nitric acid as the other mark? The biradical (*CH2OO*) reacts with SO2/NO2 which goes onto create SO3/NO3, these go onto to form their respective acids. Would that get me the marks?
    I just did formation of SO3 and (maybe) NO3, if that's correct I'd assume the sulphuric acid and nitric acid would also be accepted
 
 
 
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