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Edexcel Chemistry Unit 1 15th May

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    Can anyone explain Jun 2010, Qn 10? Why does the MS suggest C?

    10 Which of these solutions does not contain the same total number of ions as the others?
    A 10.00 cm
    3
    of 0.100 mol dm
    −3
    NaCl(aq)
    B 20.00 cm
    3
    of 0.050 mol dm
    −3
    NaCl(aq)
    C 20.00 cm
    3
    of 0.050 mol dm
    −3
    MgCl
    (aq)
    D 13.33 cm
    3
    of 0.050 mol dm
    −3
    MgCl
    2
    2
    (aq)
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    (Original post by YellowAndBlack)
    Cheeky chirpse there hahah
    :rofl:
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    (Original post by verdikt)
    Can anyone explain Jun 2010, Qn 10? Why does the MS suggest C?

    10 Which of these solutions does not contain the same total number of ions as the others?
    A 10.00 cm
    3
    of 0.100 mol dm
    −3
    NaCl(aq)
    B 20.00 cm
    3
    of 0.050 mol dm
    −3
    NaCl(aq)
    C 20.00 cm
    3
    of 0.050 mol dm
    −3
    MgCl
    (aq)
    D 13.33 cm
    3
    of 0.050 mol dm
    −3
    MgCl
    2
    2
    (aq)
    Work out the number of moles in each and then multiply that by the number of ions in each molecule (you don't need to multiply by Avogadro's constant as it would just cancel with the others). You should see why the answer is C!
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    (Original post by TenaciousMonkey)
    Yeah, 'cause I spend my time trying to get girls from TSR by seducing them with chemistry revision :P
    You, I, and the rest of the world knew what you were thinking
    You start with chemistry ... and soon you'll be discussing biology
    COCK IN SON
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    (Original post by YellowAndBlack)
    You, I, and the rest of the world knew what you were thinking
    You start with chemistry ... and soon you'll be discussing biology
    COCK IN SON
    What can I say? You got me.
  6. Offline

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    this isnt revision.

    GOD
  7. Offline

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    (Original post by Fisheh)
    this isnt revision.

    GOD
    May be it might help :P
  8. Offline

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    Anybody hazard a guess at what experiment we may have to draw out?
  9. Offline

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    (Original post by Ricky1995)
    Anybody hazard a guess at what experiment we may have to draw out?
    Something floating in acid collecting a gas of some description, thats a favourite and also very easy to mock.
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    can sum1 help me with mechanism drawing and curly arrows
  11. Offline

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    (Original post by fifty_six)
    can sum1 help me with mechanism drawing and curly arrows
    What do you need to know in particular?
  12. Offline

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    Usually it is unit 1 chemistry that is the hardest, luckily I got away with it in my first go.

    Any way I can help you guys out?
  13. Offline

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    (Original post by TenaciousMonkey)
    What do you need to know in particular?
    Show, in full, the mechanism for this reaction in which ethene is converted to
    chloroethane.
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    (Original post by UserInvalid)
    Usually it is unit 1 chemistry that is the hardest, luckily I got away with it in my first go.

    Any way I can help you guys out?
    help is really needed ..
    impo topic
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    (Original post by fifty_six)
    help is really needed ..
    impo topic
    go ahead and ask.
  16. Offline

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    (Original post by UserInvalid)
    go ahead and ask.
    how to handle MCQs and hesses law
  17. Offline

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    (Original post by fifty_six)
    how to handle MCQs and hesses law
    I didn't get what you mean by MCQ

    but for hesses, remember you need to know the defination clearly to be able to solve it.

    it is just like solving vectors, there are two directions you can solve the question, one is always unknown and the other is known. Sometimes you will have to turn the arrow, and when you turn the arrow the, if it is exo- (negative) it becomes endo (positive), vice versa.

    Remember the definations, that is the key to solve it. And sometimes remember, they add 2 moles instead of 1 in the reaction equation, so you just simply multiply the enthalpy by two.
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    (Original post by fifty_six)
    how to handle MCQs and hesses law
    In my opinion after having done a billion multiple choice questions in the various past papers is don't look for the right answer straight away unless its blazingly obvious.

    Some of them require you to think outside of the box so look at the question and attack it logically, elimate answers that it can't possibly be and if you are left with a 50% chance between two final answers at least thats betters than a 25% with 4.
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    (Original post by HarryMWilliams)
    In my opinion after having done a billion multiple choice questions in the various past papers is don't look for the right answer straight away unless its blazingly obvious.

    Some of them require you to think outside of the box so look at the question and attack it logically, elimate answers that it can't possibly be and if you are left with a 50% chance between two final answers at least thats betters than a 25% with 4.
    thank u .. i hope this will help. what other topic i need to knw..
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    "Explain why stereoisomerism can occue in alkenes, and why hex-2-ene has stereoisomers but hex-1-ene does not." (2)

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