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OCR Salters Chemistry F335 12th June 2013 Exam revision thread Watch

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    (Original post by totw)
    Hi, I have the January 2013 paper, but I don't have the mark scheme :/
    Could someone post on here please, be really grateful
    Here it is.
    Attached Images
  1. File Type: pdf F335_Jan_2013_MS_FINAL.pdf (159.7 KB, 237 views)
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    (Original post by totw)
    Hi, I have the January 2013 paper, but I don't have the mark scheme :/
    Could someone post on here please, be really grateful
    Hi can you post the paper?
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    (Original post by martynsteel)
    Not entirely sure if it's on the syllabus but the dehydration of two carboxylic acids forms an acid anhydride
    Do you know if the acid anhydride formed in this way is always cyclic?
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    (Original post by Jlane5000)
    Do you know if the acid anhydride formed in this way is always cyclic?
    I'll assume no but if this type of question comes up draw out the anhydride group then start adding on the rest of the carbons and hydrogens
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    (Original post by Tristian Fox)
    Here it is.
    Thanks


    This was posted from The Student Room's iPhone/iPad App
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    (Original post by LRC4321)
    Hi can you post the paper?
    I can't sorry, I got it in paper form not a PDF file, so I've scribbled all over it :/ also my printer/scanner has broken down so I can't scan it in even if you wanted the scribbled version sorry


    This was posted from The Student Room's iPhone/iPad App
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    Hi,

    On page 50 of the A2 official revision guide, it says that increasing the total pressure may change the rate of reaction. Why will it not always change the rate?

    Thanks!
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    (Original post by Harantony)
    Hi,

    On page 50 of the A2 official revision guide, it says that increasing the total pressure may change the rate of reaction. Why will it not always change the rate?

    Thanks!
    The reactants would have to be in the gas phase for pressure to have an effect, I think.

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    (Original post by LRC4321)
    Hi can you post the paper?
    I've got a copy.
    Attached Images
  2. File Type: pdf F335-01Jan13.pdf (262.8 KB, 106 views)
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    (Original post by martynsteel)
    I'll assume no but if this type of question comes up draw out the anhydride group then start adding on the rest of the carbons and hydrogens
    Cheers
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    (Original post by Tristian Fox)
    I've got a copy.
    Thank you very much!!
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    (Original post by suncake)
    The reactants would have to be in the gas phase for pressure to have an effect, I think.

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    I believe that it's to do with the fact of whether the equilibrium position changes as if there are an equal number of moles on both sides of an equation then the equilibrium position won't change and nor will the rate
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    Can someone help?
    On question 5(f) the June 2012 paper the question is:

    A particular slat has an ENDOTHERMIC enthalpy change of solution.
    State how the solubility of this salt would change, if at all, as temperature is increased.
    Explain your answer in terms of entropy changes. [4]

    I got it the other way round, but I thought if the enthalpy change of solution is positive then the salt cannot dissolve??

    Thank u!
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    To make a polyamide is it:

    -Carboxylic acid + Amine
    -Acyl chloride + Amine
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    (Original post by hannah1994)
    To make a polyamide is it:

    -Carboxylic acid + Amine
    -Acyl chloride + Amine
    Acyl Chloride is used to make a secondary amide in a laboratory while a Carboxylic acid is used in biological systems to make peptide (secondary amide) bonds in proteins.
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    Ive tried but i cant do these Q's can someone explain how to go about answering the followin please:

    June 12
    http://www.ocr.org.uk/Images/131296-...-by-design.pdf

    Q1 (f) (i) and (ii) and (iii), Q2 (e),(g) (iv).



    Thanks
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    (Original post by martynsteel)
    I believe that it's to do with the fact of whether the equilibrium position changes as if there are an equal number of moles on both sides of an equation then the equilibrium position won't change and nor will the rate
    But either way if you increase the pressure, the particles will be closer together so have a greater chance of colliding over the activation energy and therefore increase the rate of both the forwards and backwards reactions. I understand that the position of the equilibrium won't change but I would think that the rate changes.


    (Original post by suncake)
    The reactants would have to be in the gas phase for pressure to have an effect, I think.

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    Ahh thank you! I searched your idea and Chemguide confirmed it.
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    (Original post by Harantony)
    Ahh thank you! I searched your idea and Chemguide confirmed it.
    Yay, I actually know something for this exam! :ahee:

    Has anyone actually read Chemical Storylines in its entirety? I skimmed through AI before and realised I had never even looked at it until now... I know the revision guide picks out bits of it, but might they be evil and chuck some obscure storylines questions into the paper?

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    (Original post by suncake)
    Yay, I actually know something for this exam! :ahee:

    Has anyone actually read Chemical Storylines in its entirety? I skimmed through AI before and realised I had never even looked at it until now... I know the revision guide picks out bits of it, but might they be evil and chuck some obscure storylines questions into the paper?

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    I've read the F335 sections, and tbh, they really seem to waffle and go into a lot of detail about some concepts; that I don't think we'll really need. Most of the content is repeated regardless, so I wouldn't worry

    I really don't get the point of the storylines textbook tbh. I heard only a minority of schools base their lessons around that textbook and not the actual content, so there doesn't seem to be much point about that textbook :/
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    Do you need to know mechanisms for like Friedel Crafts? Like curly arrows for chloromethane and AlCl3?
 
 
 
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