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OCR Chemistry F322~ 4th June 2013~ AS Chemistry Watch

  • View Poll Results: How did you find the exam
    Hard A= 72
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    It was okay A= 76
    99
    35.87%
    Easy A= 79
    75
    27.17%
    Very Easy A=82
    60
    21.74%

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    (Original post by Jacksgap)
    OH okay... THANK YOU... very much

    Hope u do well in the exam this time...
    its alright thanks! you too!
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    (Original post by Sum786)
    Can someone please explain carbon capture?
    Inject into the porous rocks of old mines.
    Inject, deep into the ocean.
    React with metal oxides to form stable carbonates.
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    (Original post by cab1094)
    Has anyone made any predictions of what is likely to appear on the paper? Especially for the longer marker questions?

    I think there might be Ethanol production by comparing Hydration of Ethene Vs Fermentiation
    and it's Atom economy and percentage yield, rate of reaction, products, batch processes etc..could come up.. if it didn;t come up in Jan
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    Do we need to know about nucleophilic substitution reactions involving ammonia?


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    (Original post by Jacksgap)

    I think there might be Ethanol production by comparing Hydration of Ethene Vs Fermentiation
    and it's Atom economy and percentage yield, rate of reaction, products, batch processes etc..could come up.. if it didn;t come up in Jan
    batch processes?
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    (Original post by Smko)
    Think you'll get the marks. It asked for equation so your fine


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    Thankyou are there any other type of questions that a certain formula should be shown ? thanks again
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    On question 1iv, where you had to draw compound B, I drew the hydrogen, do I lose the mark?

    http://www.ocr.org.uk/Images/65360-q...-resources.pdf


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    (Original post by Jacksgap)

    I think there might be Ethanol production by comparing Hydration of Ethene Vs Fermentiation
    and it's Atom economy and percentage yield, rate of reaction, products, batch processes etc..could come up.. if it didn;t come up in Jan
    do you know the advantages and disadvantages for fermentation and hydration?
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    (Original post by ReginaPhalange29)
    Do we need to know about nucleophilic substitution reactions involving ammonia?


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    I don't think we have to learn the mechanism, but they could give us a mechanism and get us to add stuff like dipoles and curly arrows by "applying our knowledge" - think that came up once.
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    (Original post by needtosucceed=))
    the mark scheme normally says accept molecular formula, or don't accept it..was there anything on the right hand side box saying what to accept? I generally use structural formula unless otherwise stated, especially because it clearly shows the functional groups present. just an 'o' on the end could represent an alcohol, ketone etc.
    Thanks i know now to use the structural formula this is what the marke scheme said
    IGNORE any state symbols
    ALLOW CH3COH in equation but not for the structure
    ALLOW equations with molecular formulae but not the
    product mark
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    (Original post by mia_hilton)
    Thanks i know now to use the structural formula this is what the marke scheme said
    IGNORE any state symbols
    ALLOW CH3COH in equation but not for the structure
    ALLOW equations with molecular formulae but not the
    product mark
    ah you'd lose one mark for the product then, you'd have to use structural formula for it
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    (Original post by coco_madem0iselle)
    I don't think we have to learn the mechanism, but they could give us a mechanism and get us to add stuff like dipoles and curly arrows by "applying our knowledge" - think that came up once.
    Oh thanks


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    (Original post by Smko)
    Think you'll get the marks. It asked for equation so your fine


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    thankyou
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    The only exam that will bring a smile to my face next week

    If biology was as straightforward as chemistry......
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    (Original post by Jimmy20002012)
    On question 1iv, where you had to draw compound B, I drew the hydrogen, do I lose the mark?

    http://www.ocr.org.uk/Images/65360-q...-resources.pdf


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    it probably depends on the examiner. I think its best to be consistent when drawing - you didn't draw any of the other hydrogens so probably best to not draw it.
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    (Original post by needtosucceed=))
    it probably depends on the examiner. I think its best to be consistent when drawing - you didn't draw any of the other hydrogens so probably best to not draw it.
    Okay, this is probably a stupid question, but there is no such thing a CH3 in a cyclohexane is there?


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    (Original post by Jimmy20002012)
    Okay, this is probably a stupid question, but there is no such thing a CH3 in a cyclohexane is there?


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    you can draw a methyl group coming off any of the carbons, so it would be methylcyclohexane
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    (Original post by needtosucceed=))
    you can draw a methyl group coming off any of the carbons, so it would be methylcyclohexane
    yh if u were to draw a skeletal structure then a line would come off from any one side o the cyclhexane
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    (Original post by Jacksgap)
    yh if u were to draw a skeletal structure then a line would come off from any one side o the cyclhexane
    yep
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    (Original post by niceguy95)
    The only exam that will bring a smile to my face next week

    If biology was as straightforward as chemistry......

    Spoiler:
    Show
    exam for chem is in 3 days eeekk!!


    sorry wha exam board do u do for bio?
 
 
 
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