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  1. K

    Books for A'levels

    As this is for books I can't stay without helping you as far as A-level Chemistry is concerned. "Advanced level chemistry" by Peter Cann is the best books for both AS and A2 levels. This book is also the recommended textbook for A-level by CIE. Although from the books above listed second book...
  2. K

    Chemistry Paper 2

    Do not discuss the paper guys!! 24 hours have not passed. You will have ample time to discuss your anxious but fruitless queries wait till 10.30 am tomorrow.
  3. K

    Study Material

    I forgot to comment on the new CIE-book For A-level chemistry. 1- It is a third-class book. 2-It is relevant to syllabus but does not contain which can fulfill students' demands 3- there is nothing new in it. It is very summarized specially inorganic chemistry. 4- For Application part: It is...
  4. K

    Study Material

    Listen carefully!! On A-level chemistry book selection There are many books for A-level chemistry. But you need to be familiar with the paper pattern of especially for A2 i.e paper 42. Paper 42 has troubled the student most (refer to the June 2010 paper whose percentile for A was 54-lowest in...
  5. K

    GT's for 2011 may/june!

    do you have Questions papers of JUNE 2011 session? If have please post them
  6. K

    Sylaabus

    OCR is an excellent practice ground for both AS and A2. Go to DOWNLOAD section and click on OCR and solve the papers.
  7. K

    JUNE 2011 PAPERS

    When we are supposed to get the June 2011 session papers??
  8. K

    Chemistry paper 42 may/june 11

    This P4 was not unexpected. As for organic last time Polymerization came was in June 08 and now Jun 11. Threshold will be 64.
  9. K

    Shape of Complexes

    Read my post again. It has the all the answer. By the way improve your moral character. No one has been able to provide such an explanation as I have given. So cautious next time.
  10. K

    Reaction mechanism of Acyl chlorides???

    you will NEVER be asked regarding the mechanism of acyl chloride (ethanoyl chloride). another thing is that the mechanism is addition-elimination although nucleophilic substitution is accepted. Go to the mark scheme of J10/42 Q.1 (c)(ii). In this question the mechanism is not required but if...
  11. K

    Shape of Complexes

    Listen dude! You are confusing the things. Remember that: 1- The shape of any d-orbitals do not CHANGE during the splitting. It remain same. 2- I am talkiing about the ENERGIES of d-orbitals that change. 3- Before splitting all the d-orbitals have same energies. After the splitting the dxy...
  12. K

    Shape of Complexes

    you got it right. The energy gap between t2g and eg would be larger in case of a strong ligand and small in case of a weak ligand. Good work. Now draw the splitting pattern. The shape will remain same as octahedral.
  13. K

    Shape of Complexes

    draw the splitting pattern and then think.................. you will find the answer.
  14. K

    Chem P4 HELP !!

    Don't deal 3-D shape with rotation. Here Rotation apply for i) molecules having sigma bonds only ii) molecules having pi-bonds and sigma bonds. When a sigma bond is formed the orbitals undergo maximum rotation around its axes thus producing a strong bond (single bond like H-H, C-C). Sigma...
  15. K

    Chem P4 HELP !!

    Sorry I did not write due to Electricity problem. Here is the answer. The important point here is to use the PLANE OF ATOMS and the rotation around the axes as the question requires. compound A: This resembles benzene since it only has C=C bonds and C-H bonds. Here the rotation around the...
  16. K

    Chem P4 HELP !!

    I am writting the answer...........it's lengthy......... please wait........
  17. K

    Problematic questions.........

    For Cl- and H2SO4 For the reaction between NaCl and H2SO4 the respective syllabus guideline is 9.4(f)(ii) syllabus for JUNE 2011. As for the question P4 J9 Q.2 listen carefully!! The paper 4 also contains questions from AS. These are recall questions. In part (a) of Q2 J9 the question does...
  18. K

    Chemistry paper 4 (urgent help needed!!!)

    FOR J7 This is an absorbance spectra. If a complex absorbs in a yellow region it will reflect blue. For C: it absorbs strongly in the green region therefore the it will reflect RED. For D: it absorbs in the yellow region therefore the it will reflect BLUE. Remember if green is absorbed it...
  19. K

    Shape of Complexes

    FOR SHAPES AND SPLITTING PATTERN OF d-ORBITALS This is the area of transition metals that was only asked in J7- the first paper of the new format after N6. So I think this deserves a part of question in June 2011. The question raised by maihunpagal23 is that how do we know that the shape of...
  20. K

    Shape of Complexes

    FOR SHAPES OF COMPLEXES These are recall questions. Follow the following rules. 1- Recognize the type of ligand such as monodentate (donating one electron pair/molecule such as H2O, NH3, Cl-,Br-, OH-, CN- etc), bidentate (donating two electron pairs/ molecule NH2CH2CH2NH2 2- If six...
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