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OCR Chemistry A F322 Chains, Energy and Resources Wed 23 May 2012

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    Hello, can anyone tell me if these points would get me 3 marks for rate of hydrolysis, for example for iodine;
    -idonie has the lowest bond enthalpy
    -therefore the weakest bond
    -so less energy is required to break bonds

    Oh, and the procedure for rate of hydrolysis:
    Add AgN03, in a waterbathwith NaOh and time the reate of percipitation, i think..corect me if im wrong.

    For a fair test:
    add equal amounts of halogen alkan
    add the same chain lenghted halogenalkane
    and use a water bath so it has constant temperate....am i right?

    There's only a few weeks left so lets start asking each other questions. ))
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    (Original post by Myda)
    Yeah I'm starting to see that now! Thanks for the advice.
    You mentioned msn/fb, I wouldn't mind doing it!
    My facebook is : adam cusirinzon and my msn is : [email protected]..c ant get more simple than that lmao...send me a fb message tmos night when U wanna revise...we can use past paper questions
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    (Original post by thescientist17)
    Well for January 2012 it's 83/100 June 2011 was 76/100 though.

    Message me your msn, haven't been on it for ages but I'll add you, could do with someone to test me/ help out!
    My facebook is : adam cusirinzon and my msn is : [email protected]..c ant get more simple than that lmao...send me a fb message tmos night when U wanna revise...we can use past paper questions
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    Haha, simple is good
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    (Original post by JohnSimmons)
    Only Alkenes can have E/Z isomerisation.

    E is when groups are bonded to opposite sides of the double bond.
    Z is when they bond to the same side.

    Any question on this make sure you say CARBON CARBON double bond that CANNOT ROTATE.

    Hope this helps

    ... Also, does anyone know what kind of raw mark is needed for 100% UMS?

    Thanks
    thank you soo much
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    i can't get to any of the jan 12 papers, help anyone?
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    Hey
    Just wondering if all the fractions in fractional distillation need to be known (or known in order)?
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    (Original post by Alotties)
    Hey
    Just wondering if all the fractions in fractional distillation need to be known (or known in order)?

    I don't think you do because it's not in the specification?
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    (Original post by phoebebuffay)
    I don't think you do because it's not in the specification?
    I didn't think you needed to either but some of my class are insisting we have to s:
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    (Original post by Alotties)
    I didn't think you needed to either but some of my class are insisting we have to s:
    Ask your teacher to be sure otherwise you'd be learning uneccessary information
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    (Original post by phoebebuffay)
    Ask your teacher to be sure otherwise you'd be learning uneccessary information
    I most likely won't be seeing my teacher before the exam.
    I will try to catch him when I go in for exams but if he is teaching I won't be allowed.
    I will look at the specification again to check I think
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    Hi, does anyone know what the boundaries are on average for 90% UMS / 100% UMS?

    Thanks
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    These are some questions my teacher has emailed me, they're only for module 1 and 2 but thought they might be useful
    Attached Files
  1. File Type: rtf Alcohols, halogenoalkanes, analysis questions.rtf (1.47 MB, 1822 views)
  2. File Type: rtf Alcohols, halogenoalkanes, analysis markscheme.rtf (718.8 KB, 122 views)
  3. File Type: rtf alkanes questions.rtf (400.5 KB, 1864 views)
  4. File Type: rtf alkanes markscheme.rtf (336.0 KB, 139 views)
  5. File Type: rtf alkenes questions.rtf (606.3 KB, 2619 views)
  6. File Type: rtf alkenes markscheme.rtf (736.6 KB, 251 views)
  7. File Type: rtf spectroscopy questions.rtf (1,010.6 KB, 247 views)
  8. File Type: rtf spectroscopy answers.rtf (175.2 KB, 87 views)
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    (Original post by Alotties)
    Hey
    Just wondering if all the fractions in fractional distillation need to be known (or known in order)?
    No, you do not need to know them.
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    (Original post by breezybabe05)
    No, you do not need to know them.
    Thanks!
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    desperate for friends?
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    (Original post by dellprinter)
    desperate for friends?
    are you the guy I ignored when you added me ? and no, just being nice and helping other people out...it's called being human, you should try it sometimes
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    (Original post by ofudge)
    From what I've found, this exam is very attention to detail.
    Make sure you state where your double bond is... make sure you cover every point in the statement, and learn your definitions! Every year at least two have come up. The definitions that you need to know are:

    Enthalpy Change of Reaction: The number of moles of reactant as specified in the balanced equation react together.

    Enthalpy Change of Combustion: The enthalpy change that takes place when 1 mole of compound COMBUSTS (NOT BURNS) completely with oxygen under standard conditions, all reactants and products being in their standard states.

    The Enthalpy Change of Formation: The enthalpy change that takes place when 1 mole of compound is formed from its constituent elements in their standard state under standard conditions.

    Radical- Species with an unpaired electron
    Electrophile- Electron pair acceptor
    Nucleophile- Electron Pair Donor
    Average Bond Enthalpy- The average enthalpy change that takes place when breaking by homolytic fission 1 mole of a given type of bond of a molecule of gaseous species.
    Activation Energy- The minimum energy needed for the reaction to start by the breaking of bonds.

    Le Chatelieur Principle: The position of the equilibrium will shift to minimise the effect of any change in condition.

    Functional Group- An atom/group of atoms responsible for the chemical properties of the compound and its reactions.

    Homologous Series: Group of Organic Molecules with the same functional group and each successive member differing by CH2

    Empirical Formula: The simplest whole number ratio of atoms of each element present in a compound.

    General Formula: Simplest algebraic formula of a member of a homologous series.

    Molecular Formula: The actual number of atoms of each element present in a compound

    Structural Formula: Shows the minimal detail that shows the arrange of atoms in a molecule.

    Displayed Formula: The relative positioning of the atoms and the bonds between them.

    Skeletal Formula- Simplified organic formula shown by removing all the hydrogen atoms from alkyl chains, leaving just a carbon skeleton with associated functional groups.


    Any More i've missed be sure to add them up good luck everyone

    Nearlly all of you definitions are wrong... :confused:
    I corrected most of them.
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    (Original post by Namod)
    Nearlly all of you definitions are wrong... :confused:
    I corrected most of them.
    I know, I thought the same..
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    Hi guys

    Any ideas about what you think might come up in this paper.
    I personally think that those big questions that normally come towards the end of the paper where you have to analyse the i.r and mass spec and mr/empircal formuale and deduce the compound is going to come up, becuase it didnt come up in jan 2012.

    what do you guys think?

 
 
 
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