Did anyone take AS CIE Chemistry exam today?

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    I hope that the grade boundaries for chemistry will be lower <about an avg. of 40> for paper 22....
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    (Original post by Hirusha Madushan)
    I sat for variant 22.
    nice. how was your exam?
    and what was your answer to that optical question waaay at the end-about two isomers being formed and why?
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    (Original post by SamihaTahsin)
    nice. how was your exam?
    and what was your answer to that optical question waaay at the end-about two isomers being formed and why?
    Because of planar carbonyl group.so there's an equal chance of nucleophile attacking either side..
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    (Original post by Paranoid_Glitch)
    Oh shoot. I just lost another mark. How did you arrive at selenium if i could ask?
    I just thought that if sulfur has 8 atoms per molecule, then so will selenium as it is directly below it. Not 100% sure, though.
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    (Original post by Hirusha Madushan)
    I hope that the grade boundaries for chemistry will be lower <about an avg. of 40> for paper 22....
    same here, last years june 15 22's grade boundary was 45 which was actually quite lower than expected cause that paper was so easy. but this year there was syllabus change, plus there were 5 questions, some of those were not so easy. so i am guessing it will be lower than 45 this time.

    Fingers crossed! best of luck
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    (Original post by Hirusha Madushan)
    I hope that the grade boundaries for chemistry will be lower <about an avg. of 40> for paper 22....
    Hopefully. fingers crossed.
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    (Original post by Paranoid_Glitch)
    Oh shoot. I just lost another mark. How did you arrive at selenium if i could ask?
    It said DEFG are consecutive elements in period 4, so if Ga was D then Se had to be G
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    (Original post by SamihaTahsin)
    same here, last years june 15 22's grade boundary was 45 which was actually quite lower than expected cause that paper was so easy. but this year there was syllabus change, plus there were 5 questions, some of those were not so easy. so i am guessing it will be lower than 45 this time.

    Fingers crossed! best of luck
    Thanks a lot!!!..
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    (Original post by Hirusha Madushan)
    Because of planar carbonyl group.so there's an equal chance of nucleophile attacking either side..
    oh my god thanks a bunch man, i wrote that!

    ok so do u remember the answer to the question where they ask about how to oxidize the alcohol to ensure we get aldehyde not carboxylic acid?
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    (Original post by SamihaTahsin)
    oh my god thanks a bunch man, i wrote that!

    ok so do u remember the answer to the question where they ask about how to oxidize the alcohol to ensure we get aldehyde not carboxylic acid?
    The product should be distilled immediately before the product undergoes further oxidation..
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    (Original post by Hirusha Madushan)
    The product should be distilled immediately before the product undergoes further oxidation..
    i mentioned about fractional distillation cause aldehyde's bp is lower so it distills off more quickly. plus i also mentioned "without reflux"cause reflux ensure the full oxidation instead, right? hope i get some marks here
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    (Original post by SamihaTahsin)
    i mentioned about fractional distillation cause aldehyde's bp is lower so it distills off more quickly. plus i also mentioned "without reflux"cause reflux ensure the full oxidation instead, right? hope i get some marks here
    Your answer is correct..
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    (Original post by Hirusha Madushan)
    Your answer is correct..
    thank you so much for promptly answering my questions! means a lot, i was dying out of frustration here.

    btw i took the exam from bangladesh, where are u from?
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    (Original post by SamihaTahsin)
    thank you so much for promptly answering my questions! means a lot, i was dying out of frustration here.

    btw i took the exam from bangladesh, where are u from?
    From Srl Lanka
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    (Original post by Hirusha Madushan)
    From Srl Lanka
    so what other subjects did u take? and i am guessing you are in zone 4
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    (Original post by olmomiau;[url="tel:64579499")
    64579499[/url]]For the paper 21, question 1, the part where you had to draw the paths of a proton and a neutron in an electric field, did you draw the proton deflected upwards? I did that, but also thought that due to the the mass of the proton being nearly 2000 times the mass of the electron, its deflection could be too small to be seen. What did you put?
    Also, on question 2, for the reactions of the period 4 compound, did you use the letter they gave in the question or the actual symbol of each element?
    Yes the proton will be deflected upwards and it's smaller than the electron's. I used the actual symbol of the element, but apparently I didn't read the question so I got sulfur and aluminium as the answers. I thought it was period 3. I lost the 7 marks. Stupid I know, what did you get? That was the only question I messed up in along with the first question in the second page about the successive ionization energies, I got it wrong, realized my mistake, I was like 'I'll change it in a bit'. But I did not, so I just lost 2 marks. I'm pretty sure of all of my other answers. So I guess I lost 9 marks only in total.
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    (Original post by Paranoid_Glitch;[url="tel:64580631")
    64580631[/url]]For the MgO acid question what did people write. I wrote that it would react to form a salt hence using up the MgO but seems there is more to it?What do you think?
    I wrote that MgO is alkaline, hence it would react with the acid and a salt will be formed. I also mentioned that it's a neutralisation reaction.
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    (Original post by maria.x)
    Yes the proton will be deflected upwards and it's smaller than the electron's. I used the actual symbol of the element, but apparently I didn't read the question so I got sulfur and aluminium as the answers. I thought it was period 3. I lost the 7 marks. Stupid I know, what did you get? That was the only question I messed up in along with the first question in the second page about the successive ionization energies, I got it wrong, realized my mistake, I was like 'I'll change it in a bit'. But I did not, so I just lost 2 marks. I'm pretty sure of all of my other answers. So I guess I lost 9 marks only in total.
    In question 2, if you got everything else right then you only lose 2 marks as it is error carried forward.
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    (Original post by maria.x)
    Yes the proton will be deflected upwards and it's smaller than the electron's. I used the actual symbol of the element, but apparently I didn't read the question so I got sulfur and aluminium as the answers. I thought it was period 3. I lost the 7 marks. Stupid I know, what did you get? That was the only question I messed up in along with the first question in the second page about the successive ionization energies, I got it wrong, realized my mistake, I was like 'I'll change it in a bit'. But I did not, so I just lost 2 marks. I'm pretty sure of all of my other answers. So I guess I lost 9 marks only in total.
    I got the elements just below aluminium and sulfur (gallium and selenium)
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    (Original post by olmomiau;[url="tel:64582595")
    64582595[/url]]In question 2, if you got everything else right then you only lose 2 marks as it is error carried forward.
    How can you be so sure? :eek: I've only seen ecf in moles. I mean, If I wrote Al2O3+6HCl=2AlCl3 + 3H2O that's not the right answer, so I'll just get a 0. Simple as that.
 
 
 
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