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  1. Umar Zain

    how was chemistry paper 22

    I see. O & N do form pi bonds. And C too. But don't confuse double bond with pi bond
  2. Umar Zain

    how was chemistry paper 22

    What? Nonono. I'm taking a two years course. We did learn about pi bond in AS. Is the question asking about pi bond or double bond, again?
  3. Umar Zain

    how was chemistry paper 22

    Again is the question asking about pi bond or double bond? Double bond is not necessarily pi bond
  4. Umar Zain

    Paper variants

    So easy...wow! But the GT spoil the challenge, thrill and fun.
  5. Umar Zain

    how was chemistry paper 22

    It reacts/hydrolyse to from hydrated ions...but still ions
  6. Umar Zain

    how was chemistry paper 22

    We still have MCQ and Practical to go. That's why I'm discussing(not arguing). The free ions of Al & Be chlorides conduct electricity
  7. Umar Zain

    how was chemistry paper 22

    That is true. Therefore only Group IV elements can form pi bonds. Carbon for example has electron configuration of 1s2.2s2.2p2. The 2s2.2p2 orbital will hybridize into 1s.1p(x).1p(y).1p(z) or sp3. the p(z) hybridized orbital from two adjacent C atoms are parallel to each other. Hence form a pi...
  8. Umar Zain

    how was chemistry paper 22

    Wait wait. I'm very sure it's Al/Be...but not sure for H
  9. Umar Zain

    Paper variants

    Easily? If I get 80% for AS and 98%(which is impossible) for A2, on average I will get 89%.
  10. Umar Zain

    how was chemistry paper 22

    Al & Be reacts with water to form hydrated ions. Not sure if HCl is covalent.
  11. Umar Zain

    how was chemistry paper 22

    Humm...is the question asking about double bond or pi bond? Only Group IV elements can form pi bonds due to sp3 hybridization
  12. Umar Zain

    how was chemistry paper 22

    I think you should also mention why it is the biggest. Due to most number of electrons/electron shells.
  13. Umar Zain

    how was chemistry paper 22

    Only Group IV elements like C which has 4 valence electrons can form pi bond through sp3 hybridization.
  14. Umar Zain

    Paper variants

    Physics only. I'm aiming for an A*. Hoping to get into Imperial College. In theory, I can still get that if I get very high marks for MCQ and practical but the chances are thin.
  15. Umar Zain

    AS Physics (9702) Paper 22 Answers and Discussion

    I thought we are suppose to discuss instead of criticizing here. What you mean is that they won't accept that answer because it does not answer the question based on equilibrium of forces. So if I answer "The rod exert a horizontal force on A, there would be an equal but opposite force (normal...
  16. Umar Zain

    Paper variants

    Physics, Chemistry, Maths, Further Maths
  17. Umar Zain

    Paper variants

    I am taking the May/June 2013 session. In case I have to repeat, should I repeat on October/November 2013 (which is harder) or May/June 2014 (which I need to take the repeat papers together with A2 papers). I'm taking 4 subjects.
  18. Umar Zain

    Paper variants

    Why are there many variants for a paper? e.g. Physic 21/22/23 To who/where does each variant belongs to? Which is more difficult among the variants (1/2/3/...)? Is October/November session always harder than May/June session? Is it allowed to repeat only one particular subject?
  19. Umar Zain

    AS Physics (9702) Paper 22 Answers and Discussion

    For the momentum graphs, must we show all calculations?
  20. Umar Zain

    AS Physics (9702) Paper 22 Answers and Discussion

    For the moment: perpendicular distance = 0 m...so moment = 0 Nm
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