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OCR AS - Chemistry Unit F322 - Chains, energy and resource - REVISION! watch

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    grade boundaries for A?
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    Quick question, would you lose marks for writing Ea instead of activation energy?
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    (Original post by touran22)
    thats what i thought the overall equation was...can some one please clarify!

    and yes The rate or formation of ozone = The rate of decomposition <----- this statement is for o3+o--->2o2
    Markscheme accepts:

    O3 + O ---> 2O2
    2O3 ---> 3O2
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    How do you draw the skeletal formula for E/Z isomers? and how do you know how to change what?
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    someone plz help with this 1 mark question. JUNE 2010 F322 PAPER

    how do u do 6 c (i). i know it must be easy as it is only 1 mark but i don't get it.

    http://www.ocr.org.uk/download/pp_10...n_gce_f322.pdf
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    (Original post by Flint_09)
    someone plz help with this 1 mark question. JUNE 2010 F322 PAPER

    how do u do 6 c (i). i know it must be easy as it is only 1 mark but i don't get it.

    http://www.ocr.org.uk/download/pp_10...n_gce_f322.pdf
    (2.5 x 10^5) x 4 (as there are 4 moles of NO) x -909kJmol^-1
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    GUYS!!!???? can i use the term Ea in answers instead of writing activation energy? or will they deduct marks?
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    (Original post by EternalDoom)
    Quick question, would you lose marks for writing Ea instead of activation energy?
    NOO
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    (Original post by croag)
    FML, done no revision. What's the likelihood of me getting at least 70% (gotta get this to get an A) if I start now?
    Depends on what u already know mate
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    Hey guys... what do u think might come up?
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    Do you have to draw dots on your radicals or not

    also, when do you draw these dots

    some mark schemes take away marks for drawing dots on radicals, some penalise you for not drawing them

    what!
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    I don't understand why people are saying past papers don't prepare you for the exam??? :/
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    (Original post by EternalDoom)
    Markscheme accepts:

    O3 + O ---> 2O2
    2O3 ---> 3O2
    How do you draw the skeletal formula for E/Z isomers? and how do you know how to change what?
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    (Original post by bagelbe)
    I don't understand why people are saying past papers don't prepare you for the exam??? :/
    THEY DO

    but examiners always come up with rubbish random questions
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    (Original post by sixthformer)
    THEY DO

    but examiners always come up with rubbish random questions
    Yeah, I blame OCR because they always seem to take a bit from the book that is really small part of it and then write a 6 mark question on it >
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    (Original post by lucy1234)
    grade boundaries for A?
    Varies between papers, but I'd say between 75-80%?
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    (Original post by sixthformer)
    THEY DO

    but examiners always come up with rubbish random questions
    Salaam bro could you help me please

    How do you draw the skeletal formula for E/Z isomers? and how do you know how to change what?
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    (Original post by High VOLTAGE)
    How do you draw the skeletal formula for E/Z isomers? and how do you know how to change what?


    First would be (E / Trans) pent-2-ene
    Second would ( Z / Cis) Pent-2-ene

    way i remember is that Z isomers have a bucket shape, and E is just normal skeletal formula
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    (Original post by bagelbe)
    I don't understand why people are saying past papers don't prepare you for the exam??? :/

    (Original post by High VOLTAGE)
    How do you draw the skeletal formula for E/Z isomers? and how do you know how to change what?

    (Original post by bagelbe)
    Yeah, I blame OCR because they always seem to take a bit from the book that is really small part of it and then write a 6 mark question on it &gt;

    (Original post by bagelbe)
    Varies between papers, but I'd say between 75-80%?

    (Original post by High VOLTAGE)
    Salaam bro could you help me please

    How do you draw the skeletal formula for E/Z isomers? and how do you know how to change what?
    Do you have to draw dots on your radicals or not

    also, when do you draw these dots

    some mark schemes take away marks for drawing dots on radicals, some penalise you for not drawing them

    what!
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    (Original post by EternalDoom)


    First would be (E / Trans) pent-2-ene
    Second would ( Z / Cis) Pent-2-ene

    way i remember is that Z isomers have a bucket shape, and E is just normal skeletal formula
    THANK YOU !
    and do you draw the bucket and then just extend however many carbons you need from there?
 
 
 
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