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AS OCR chemistry B (SALTERS) F331 on the 15th may 2012

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    Could someone tell me what disadvantages of biofuels and hydrogen the mark scheme accepts?? Thanks
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    (Original post by dirrane)
    That was Beautifully put together mate
    haha thanks, good luck!!
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    (Original post by sunny_veggies)
    Could someone tell me what disadvantages of biofuels and hydrogen the mark scheme accepts?? Thanks
    Disadvantages of biofuels: Take up a lot of space that could be used for crops, reduces biodiversity, CO2 emissions in manufacture

    Hydrogen - highly flammable, needs to kept under high pressure
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    (Original post by bertiejess)



    Disadvantages of biofuels: Take up a lot of space that could be used for crops, reduces biodiversity, CO2 emissions in manufacture

    Hydrogen - highly flammable, needs to kept under high pressure
    Thankyou sooo much, Good luck!!
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    (Original post by Salmonidae)
    Yes that stuff is in either F332 or you're on the wrong thread for your exam sylabus, will not find anything on that in F331
    oh thank god im terrible at it
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    Guys remember to be able to spell the word heterogeneous catalyst
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    Reforming = Cycloalkane and Hydrogen
    Craking = Alkane and Alkene
    Isomerisation = Branched chain.

    Is that all correct?
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    conditions and reagents, thats f332 right?
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    (Original post by vicky8761)
    conditions and reagents, thats f332 right?
    Yes, HERE is the spec.
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    Do we have to wait till midnight again?
    mann i cant wait that long, cos i got an exam at 9 in the blooody morning
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    (Original post by dirrane)
    Do we have to wait till midnight again?
    mann i cant wait that long, cos i got an exam at 9 in the blooody morning
    No we don't, not on OCR
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    (Original post by Salmonidae)
    Reforming = Cycloalkane and Hydrogen
    Craking = Alkane and Alkene
    Isomerisation = Branched chain.

    Is that all correct?
    yes

    reforming produces cycloalkanes and arenes and hydydrogen

    isomerisation creates branched chain isomers by heating straight chain alkanes with a platinum catalyst on inert aluminium oxide.

    2 forms of cracking- thermal and catalytic cracking

    thermal- high temp 100 celsius and high pressure makes mostly alkenes

    catalytic- makes mostly motor fuels and aromatic hydrocarbons. uses a zeolite catalyst at a slight pressure and 450 celsuis
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    (Original post by Salmonidae)
    No we don't, not on OCR
    yeahhhhhhhhhhhh thank you
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    Electron configurations are in F331 right?
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    what is the formula of a cycloalkene? as in cn...
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    (Original post by randomfatguy)
    Electron configurations are in F331 right?
    Yes they are

    (Original post by dongonaeatu)
    what is the formula of a cycloalkene? as in cn...
    Simply CnH2n, if you think about it ever carbon is bonded to another two carbons so only has space for 2 hydrogens
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    (Original post by Salmonidae)
    Yes they are



    Simply CnH2n, if you think about it ever carbon is bonded to another two carbons so only has space for 2 hydrogens
    no that is wrong
    it is cnh2n-2

    cyclopentene is c5h8
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    Good luck everyone, i am getting ready now and off to school
    hope it is an easy paper
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    (Original post by dirrane)
    Good luck everyone, i am getting ready now and off to school
    hope it is an easy paper
    good luck and god bless
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    (Original post by dirrane)
    Good luck everyone, i am getting ready now and off to school
    hope it is an easy paper
    You too, just hopped on the train on me phone and revision cards

    GOOD LUCK EVERYONE - NAIL THIS CHEMISTRY

    Personally i hate the subject but its crunch time!

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