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Chemistry: Post your doubts here!

Discussion in 'International A And AS Level' started by XPFMember, Sep 29, 2011.

  1. teachyourself

    teachyourself

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  3. student2

    student2

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    Cn dere b H- bonds b/w Ch3CH2CH2NH2 molecules? Lyk the +ve H of 1 molecue to a -ve N of a diff molecule?
     
  4. Thought blocker

    Thought blocker

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    Yes it can have. Strong electronegative element N is present in other propanamine that can form H bonds with hydrogen present in the other propanamine.
     
  5. student2

    student2

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    ok. cn sm1 tell me if the chem P5 pprs hv a format which does nt hv planning experiments lyk b4? I dnt see ques lyk tht in recent yrs so wondering if it's chnged?
     
  6. krishnapatelzz

    krishnapatelzz

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    read syllabus .. planning is a part of the paper
     
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  7. Dharyl

    Dharyl

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    hi all, can somebody help me, i am looking for a revision book for ATP o level chemistry sylab:5070, thanks
     
  8. teachyourself

    teachyourself

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  9. Need A*

    Need A*

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    For All to use
     

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  10. drowning-in-studies

    drowning-in-studies

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    Screenshot (9).png Screenshot (10).png
    How do you find the conc of Ca2+ and Mg2+?
     
  11. drowning-in-studies

    drowning-in-studies

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    (ii) The partition coeffi cient of a particular pesticide between hexane and water is 6.0.
    A solution contains 0.0042 g of the pesticide dissolved in 25 cm3 of water. The solution is
    shaken with 25 cm3 of hexane.
    Calculate the mass of pesticide that will be dissolved in the hexane layer at equilibrium
    Ans is 0.0036g
     
  12. drowning-in-studies

    drowning-in-studies

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    Screenshot (11).png Screenshot (14).png
    How do we know where the Br attaches in 4 (b) (ii)?
     
  13. drowning-in-studies

    drowning-in-studies

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    Screenshot (15).png Screenshot (16).png
    Why is [Fe3+(aq)] = 0.2 mol dm–3 in (d)?
    And can you explain (c) (iii)?
     
  14. krishnapatelzz

    krishnapatelzz

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    this is the paper which i gave exam of :p i have solved it i will post the reply in 5 min :)
     
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  15. krishnapatelzz

    krishnapatelzz

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  16. krishnapatelzz

    krishnapatelzz

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  17. drowning-in-studies

    drowning-in-studies

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    How does the moles of Ca2+ equal to the mole of H2Y2–? Isn't the ratio from the equation 1:2?
     
  18. krishnapatelzz

    krishnapatelzz

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    not for that , because y2- ion has charge 2- and so needs only one ca2+ . note - mg2+ was removed by precipitating so only ca2+ is left . :D
     
  19. drowning-in-studies

    drowning-in-studies

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    ahh ok thanks
     
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  20. HarshuOP

    HarshuOP

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    Could anyone do 9701/52/MJ/15 Q2 part d part 1? Mass of HX. How to ? Thanks
     
  21. teachyourself

    teachyourself

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    buy a topical past paper book if it is available

    or download from here
    http://www.gceguide.com/topical-past-papers/
     

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