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    (Original post by Glavien)
    How would you name this?

    Attachment 543061


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    N - ethyl n propyl butanamine ??
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    Guys if i did bad in my EMPA can i still get an A* overall if my AS grade is a super high A and I do well in A2 units?
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    (Original post by Aimen.)
    Q#11 (d)
    Right. Ill take a look later (just getting ready atm ) then ill answer you.

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    (Original post by jessyoung)
    Guys if i did bad in my EMPA can i still get an A* overall if my AS grade is a super high A and I do well in A2 units?
    What exam board is this? AQA have stopped EMPA right?

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    (Original post by kiiten)
    What exam board is this? AQA have stopped EMPA right?

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    Yeah
    New spec haven't got empa anymore


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    (Original post by Aimen.)
    Q#11 (d)
    :/ im really sorry but im not sure how to answer this. Im doing AS AQA chem. Ive done equilibrium and in relation to what you originally asked if you remove the product as its being produced the position of equilibrium will shift so more is being produced. But this question is asking about titrations and the container is sealed.

    Maybe someone else might be able to help or you could look at the markscheme. Sorry

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    (Original post by Bloom77)
    Yeah
    New spec haven't got empa anymore
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    Yeah AQA but I'm the last year to do it
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    Can someone explain the final parts of this question? Where it says "Give the formula of the complex cobalt compound Z that you would expect.."
    Attachment 543935
    Thank you!

    (A2 AQA chem)
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    (Original post by Louiseelg0rt)
    Can someone explain the final parts of this question? Where it says "Give the formula of the complex cobalt compound Z that you would expect.."
    Attachment 543935
    Thank you!

    (A2 AQA chem)
    Can't open the attachment for some reason!
    Which paper was it from?
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    (Original post by kiiten)
    :/ im really sorry but im not sure how to answer this. Im doing AS AQA chem. Ive done equilibrium and in relation to what you originally asked if you remove the product as its being produced the position of equilibrium will shift so more is being produced. But this question is asking about titrations and the container is sealed.

    Maybe someone else might be able to help or you could look at the markscheme. Sorry

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    Hey, that's totally okay, I got it anyway!
    But thanks for trying x
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    (Original post by haj101)
    Can't open the attachment for some reason!
    Which paper was it from?
    Sorry I'm not sure what I did with that attachment haha

    It was the final question on the unit 5 June 2013 paper
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    (Original post by Louiseelg0rt)
    Sorry I'm not sure what I did with that attachment haha

    It was the final question on the unit 5 June 2013 paper
    Okay so you first have to calculate the moles of Cobalt in cobalt chloride:

    50/1000 X 0.203= 0.01015 moles

    Then we are given the information that AgCl is produced from reacting Z with silver nitrate so we can find out the moles of AgCl....
    4.22/143.4 = 0.0294

    The ratio is 0.01015:0.0294

    we can divide each value by 0.01015 to get us:

    2.9 : 1
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    (Original post by haj101)
    Okay so you first have to calculate the moles of Cobalt in cobalt chloride:

    50/1000 X 0.203= 0.01015 moles

    Then we are given the information that AgCl is produced from reacting Z with silver nitrate so we can find out the moles of AgCl....
    4.22/143.4 = 0.0294

    The ratio is 0.01015:0.0294

    we can divide each value by 0.01015 to get us:

    2.9 : 1
    Thanks! I got that bit, do you know how to go about the bit after that?
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    (Original post by Louiseelg0rt)
    Thanks! I got that bit, do you know how to go about the bit after that?
    I'm not too sure about the last bit im afraid sorry about that!
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    http://www.thestudentroom.co.uk/atta...hmentid=544235
    Hey im not sure on some Unit 4 Qs. 6b ( why is there permamnent dipole dipole interactions...is it due to the polar alcohol bond) and 6c ( the wrong answer c seems feasible to me but why is that fragments without H are unlikely)Thanks in advance TeachChemistry
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    (Original post by ayvaak)
    http://www.thestudentroom.co.uk/atta...hmentid=544235
    Hey im not sure on some Unit 4 Qs. 6b ( why is there permamnent dipole dipole interactions...is it due to the polar alcohol bond) and 6c ( the wrong answer c seems feasible to me but why is that fragments without H are unlikely)Thanks in advance TeachChemistry
    6b: C-O bond polar
    6c: If you draw out the structural formula you will not be able to break bonds anywhere to give fragment C.
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    Chemistry unit 5

    January 2010

    Question 3h

    Is it okay to say:

    Electrolysis of water to obtain hydrogen uses fossil fuels so not carbon neutral






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    I don't understand why the answer is B, I thought because since 1 mol of chromium(III) sulphate has 392g, hence the standard would also contain 392g since it also should have a 1moldm3 concentration ?
    Attached Images
     
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    (Original post by PlayerBB)
    I don't understand why the answer is B, I thought because since 1 mol of chromium(III) sulphate has 392g, hence the standard would also contain 392g since it also should have a 1moldm3 concentration ?
    You want 1M of the ion.
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    (Original post by Bloom77)
    Chemistry unit 5

    January 2010

    Question 3h

    Is it okay to say:

    Electrolysis of water to obtain hydrogen uses fossil fuels so not carbon neutral






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    Yeah
 
 
 
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