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Edexcel - Chemistry Unit 2 - 4 June 2013 Watch

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    (Original post by Goods)
    I missed up the oscilloscope and a few electricity bits but I think I did quite well. I didn't really like the 6 marker


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    oh , but im talking about the unit 1 paper lol , i messed up in it
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    (Original post by Jayqwe)
    I posted both yesterday either in this thread or another one
    can u please post t for me again , cuz i really have to go through21 pages and theirs no time ,,, please thanks
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    Someone please help
    (Original post by Katy1704)
    Hello I'm confused on question 17fii on the May 2011 paper. What apparatus is the mark scheme looking for? (If you have a page number in the edexcel textbook would be very helpful so I can see it) thank you
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    hey all, does anyone understand this:

    during the titration, the barium hydroxide was added until it was present in excess. the electrical conductivity of the titration mixture:

    A: increased steadily
    B: decreased steadily
    C: increased then decreased
    D: decreased and then increased

    The answer is D but does anyone know why??
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    (Original post by Mimi85)
    can u please post t for me again , cuz i really have to go through21 pages and theirs no time ,,, please thanks
    It's either on the page before this one, or the one before that. It would take 2 mins to find it. I worry for you if this is the attitude you take towards your revision.

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    (Original post by charlieejobson)
    hey all, does anyone understand this:

    during the titration, the barium hydroxide was added until it was present in excess. the electrical conductivity of the titration mixture:

    A: increased steadily
    B: decreased steadily
    C: increased then decreased
    D: decreased and then increased

    The answer is D but does anyone know why??
    Barium hydroxide reacts to produce something that's not soluble i guess. Therefore the number of aqueous ions decreases then as barium goes into excess the number of ions increases. The whole question would help though I can only guess not knowing the titre and samples


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    (Original post by Mimi85)
    oh , but im talking about the unit 1 paper lol , i messed up in it
    I do AQA must be different boards


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    (Original post by Katy1704)
    Someone please help
    Post the question please I can't help without something to answer


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    (Original post by Goods)
    Barium hydroxide reacts to produce something that's not soluble i guess. Therefore the number of aqueous ions decreases then as barium goes into excess the number of ions increases. The whole question would help though I can only guess not knowing the titre and samples


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    Helpp

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    the electric conductivity of a solution depends on the numbers of dissolved ions. When the barium hydroxide is added it reacts with the dissolve ions to form a solid therefore reducing the number of ions and the conductivity. When you start adding it in excess you and more ions therefore increasing the conductivity. So decrease then increase
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    Sorry guys, I need an answer to this question. Are we required to know unit 1?

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    (Original post by senz72)
    Sorry guys, I need an answer to this question. Are we required to know unit 1?

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    yes
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    (Original post by Goods)
    the electric conductivity of a solution depends on the numbers of dissolved ions. When the barium hydroxide is added it reacts with the dissolve ions to form a solid therefore reducing the number of ions and the conductivity. When you start adding it in excess you and more ions therefore increasing the conductivity. So decrease then increase
    Thank youuu

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    (Original post by Goods)
    yes
    Well I'm screwed. All of it or just a few specifics?

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    (Original post by senz72)
    Well I'm screwed. All of it or just a few specifics?

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    You need to know all the basics that are used in unit 2 questions. Like acid + metal = salt + h2 that kind of simple stuff.
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    (Original post by Goods)
    You need to know all the basics that are used in unit 2 questions. Like acid + metal = salt + h2 that kind of simple stuff.
    Thanks.



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    How is everyones revision going today?
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    (Original post by HarryMWilliams)
    How is everyones revision going today?
    No progress for me.

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    (Original post by senz72)
    No progress for me.

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    Where are you 'stuck'?
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    (Original post by HarryMWilliams)
    Where are you 'stuck'?
    Just the whole halogenoalkane mechanism business?

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