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    I wrote for Q4(a)(ii) CHEM2 June 2015:

    A high operating pressure means that there are more gas particles in a given volume. This means that particles will be more closer together and collide more often. Also, there will be a lot more particles with energy greater than or equal to the activation energy. This means that there will be more frequent successful collisions in a given time so faster rate of reaction.A higher pressure also means that particles will be colliding with each other more and more particles will be moving in a random manner so a faster rate of reaction. As more particles are moving about randomly and there are more particles in a given volume, this will increase the number of frequent successful collisions so a faster rate of reaction.

    The mark scheme says:

    M1The reaction gets to equilibrium faster / in less time
    OR
    Produces a small yield faster / in less time
    OR
    Increases the rate (of reaction / of attainment of equilibrium)

    M2 High pressure leads to one of the following
    • more particles / molecules in a given volume
    • particles / they are closer together
    • higher concentration of particles /molecules
    AND• more collisions in a given time / increased collision frequency

    Is it worth remarking for this mark? I felt I got M1 for a faster rate of reaction and M2 I obviously got. I have bolded what I feel is creditworthy.

    Thanks in advance. Ik it's 1 mark but it is 2 UMS. I am also thinking of remarking CHEM1 having got my script back as well.
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    i supose it is worth a try because it it is in the mark sceme, i think they did want something about equilibrium though. but on remarks they are a bit nicer and you might get one somewhere else aswell if not dont worry one is quite easy to make up somewhere else
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    (Original post by Amber May)
    i supose it is worth a try because it it is in the mark sceme, i think they did want something about equilibrium though. but on remarks they are a bit nicer and you might get one somewhere else aswell if not dont worry one is quite easy to make up somewhere else
    Thanks for your advice

    I got 98/100 so I'm not sure if it's worth remarking... the other mark I lost was completely wrong so no chance of that going up. The remark won't change my grades but just the average UMS and personal satisfaction! I don't think I can go down elsewhere but I will wait for advice from my teacher.

    I got 68/70 in chem1 and want to remark that as well as I am 100% sure I should have got a mark but another question could go down 1 so I'm not too sure...
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    Was it 1:1 raw : UMS?

    You should be doing OCR, 58/60 raw got 90/90 UMS (maybe even 57/60 for 90 UMS, 56 got 87 UMS) on paper 1
    Paper 2 needed 96/100 raw to get 150/150 UMS.
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    (Original post by PS4)
    Thanks for your advice

    I got 98/100 so I'm not sure if it's worth remarking... the other mark I lost was completely wrong so no chance of that going up. The remark won't change my grades but just the average UMS and personal satisfaction! I don't think I can go down elsewhere but I will wait for advice from my teacher.

    I got 68/70 in chem1 and want to remark that as well as I am 100% sure I should have got a mark but another question could go down 1 so I'm not too sure...
    ok then yeah mabey not worth it if your school are gonna charge you for it! I dont think they can take marks off you though, i think with remarks you can only go up or stay the same

    Those are good marks, what are your other subjects/ what do you want to at Uni (if at all) ?
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    (Original post by Pigster)
    Was it 1:1 raw : UMS?

    You should be doing OCR, 58/60 raw got 90/90 UMS (maybe even 57/60 for 90 UMS, 56 got 87 UMS) on paper 1
    Paper 2 needed 96/100 raw to get 150/150 UMS.
    No it was around 1 mark is 1.5 ums. I have heard that ocr chemistry is easier but my school did aqa

    What do you think of me remarking it?
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    (Original post by Amber May)
    ok then yeah mabey not worth it if your school are gonna charge you for it! I dont think they can take marks off you though, i think with remarks you can only go up or stay the same

    Those are good marks, what are your other subjects/ what do you want to at Uni (if at all) ?
    Thank you

    My other subjects are a2 maths (already completed), a2 chemistry a2 economics and a2 further maths.

    I intend to do economics at either lse ucl warwick Cambridge or Durham!

    What about yourself?

    Thanks for the advice!
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    (Original post by PS4)
    I wrote for Q4(a)(ii) CHEM2 June 2015:

    A high operating pressure means that there are more gas particles in a given volume. This means that particles will be more closer together and collide more often. Also, there will be a lot more particles with energy greater than or equal to the activation energy. This means that there will be more frequent successful collisions in a given time so faster rate of reaction.A higher pressure also means that particles will be colliding with each other more and more particles will be moving in a random manner so a faster rate of reaction. As more particles are moving about randomly and there are more particles in a given volume, this will increase the number of frequent successful collisions so a faster rate of reaction.

    The mark scheme says:

    M1The reaction gets to equilibrium faster / in less time
    OR
    Produces a small yield faster / in less time
    OR
    Increases the rate (of reaction / of attainment of equilibrium)

    M2 High pressure leads to one of the following
    • more particles / molecules in a given volume
    • particles / they are closer together
    • higher concentration of particles /molecules
    AND• more collisions in a given time / increased collision frequency

    Is it worth remarking for this mark? I felt I got M1 for a faster rate of reaction and M2 I obviously got. I have bolded what I feel is creditworthy.

    Thanks in advance. Ik it's 1 mark but it is 2 UMS. I am also thinking of remarking CHEM1 having got my script back as well.

    Hi,Do you know where I can get the official or unofficial markscheme for AS Level Chemistry Unit 2 AQA? I've tried and tried but I can't find it - Just want to see if it's worth sending my paper off for a remark or not. Thanks!
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    (Original post by cb103)
    Hi,Do you know where I can get the official or unofficial markscheme for AS Level Chemistry Unit 2 AQA? I've tried and tried but I can't find it - Just want to see if it's worth sending my paper off for a remark or not. Thanks!

    https://drive.google.com/folderview?...XBaWmdDU3FYS1k
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    Is mine worth remarking?
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    I'm only 2 raw marks far behind the A, do you think there is any chance for increase if I get it remarked?
    I'm doing AS
 
 
 
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