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    (Original post by Super199)
    Anyone care to help me with the following.

    Give the structure and name of every haloalkane that could be produced by the reaction of methane with chlorine.
    I can't provide the structure but you can google the names though

    Free Radical Substitution can produce different types of halogenoalkanes.

    In the case of the chlorination of methane, 4 types of halogenoalkanes can be produced

    Chloromethane, Dichloromethane, Trichloromethane and Tetrachloromethane

    You can produce these when there is an excess of chlorine in free radical substitution
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    (Original post by zhang-liao)
    I can't provide the structure but you can google the names though

    Free Radical Substitution can produce different types of halogenoalkanes.

    In the case of the chlorination of methane, 4 types of halogenoalkanes can be produced

    Chloromethane, Dichloromethane, Trichloromethane and Tetrachloromethane

    You can produce these when there is an excess of chlorine in free radical substitution
    Although the structure of these is very simple: Chloromethane is a Carbon bonded to 3 Hydrogens and 1 Chlorine. Dichloromethane is a Carbon bonded to 2 Hydrogens and 2 Chlorines. Trichloromethane is a Carbon bonded to 1 Hydrogen and 3 Chlorines. Tetrachloromethane is a Carbon bonded to 4 Chlorines.
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    (Original post by l1lvink)
    Although the structure of these is very simple: Chloromethane is a Carbon bonded to 3 Hydrogens and 1 Chlorine. Dichloromethane is a Carbon bonded to 2 Hydrogens and 2 Chlorines. Trichloromethane is a Carbon bonded to 1 Hydrogen and 3 Chlorines. Tetrachloromethane is a Carbon bonded to 4 Chlorines.
    Yep. the most stable of which is tetracholoromethane

    Was there any thing else in particular you stuck on?
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    how did it go? like is this the evaluative for collecting gas volumes?? how'd ya find it?
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    (Original post by thechemistress)
    I'm OCR chemistry
    has anybody done the gas volumes eval paper yet? is it hard? :/
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    Heyy, anyone doing edexcel?
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    nope ocr a :/ anybody done the qual or eval???
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    How would you answer this?

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    (Original post by O9tharakanc)
    Hey I do ocr biology as well how are you finding it? What are your methods of revising I am quite nervous at the mo cause we haven't finished at least 1 unit yet

    I do aqa biology and ocr chemistry js
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    (Original post by Puresha)
    Heyy, anyone doing edexcel?
    Yep, I'm doing Edexcel
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    (Original post by SFarooq)
    How would you answer this?

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    Ok, the Atomic Mass of Boron is 10.8. Using that information, calculate the percentage abundance of Boron-10

    Now, if the rule says

    (Mr of Isotope A x Abundance of Isotope A) + (Mr of Isotope B x Abundance of Isotope B) / 100 = Atomic Mass

    You've got the value of the atomic mass of Boron and two isotopes right?

    (10 x X) + (11 x Y) /100 = 10.8

    10.8 would mean Boron 11 is more abundant since the atomic mass value is closer to 11 than 10 right?

    It's quite difficult to explain but if the value is 10.5, there's a 50:50 ratio

    So if 10.8 there'd be a 20:80 ratio to an extent

    Work it out

    (10 x 20) + (11 x 80) / 100 = 10.8

    Hope I explained it well enough.
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    (Original post by zhang-liao)
    Ok, the Atomic Mass of Boron is 10.8. Using that information, calculate the percentage abundance of Boron-10

    Now, if the rule says

    (Mr of Isotope A x Abundance of Isotope A) + (Mr of Isotope B x Abundance of Isotope B) / 100 = Atomic Mass

    You've got the value of the atomic mass of Boron and two isotopes right?

    (10 x X) + (11 x Y) /100 = 10.8

    10.8 would mean Boron 11 is more abundant since the atomic mass value is closer to 11 than 10 right?

    It's quite difficult to explain but if the value is 10.5, there's a 50:50 ratio

    So if 10.8 there'd be a 20:80 ratio to an extent

    Work it out

    (10 x 20) + (11 x 80) / 100 = 10.8

    Hope I explained it well enough.
    Thank you!

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    (Original post by SFarooq)
    Thank you!

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    You're welcome
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    (Original post by zhang-liao)
    Yep, I'm doing Edexcel
    omg help a sister out im dying
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    (Original post by Puresha)
    omg help a sister out im dying
    What's you finding difficult?
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    (Original post by zhang-liao)
    What's you finding difficult?
    I messaged you
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    Anyone have the Elements from the sea end of module test for OCR salters?

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    (Original post by Isabella~)
    Anyone have the Elements from the sea end of module test for OCR salters?

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    Nope, we haven't even started that topic yet!
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    (Original post by Nidfeo)
    Nope, we haven't even started that topic yet!
    Really? What topic are you on??

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    Got a U in my recent mock and we did the 2014 paper. Need help with how much AS chemistry revision I should do everyday in order to get an A.I'm also getting confused by nomenclature and isomers, can anyone help me with this?
 
 
 
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