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  1. Mahnoorfatima

    A level Biology: Post your doubts here!

    There's this question where we have to investigate the solution surrounding the seeds(which conntains enzymes) if they hydrolysed thhe sucrose solution or not. We perform benedicts on it. The second part,which i dont get, says describe hpw u could modify this procedure to investigate the effect...
  2. Mahnoorfatima

    A level Biology: Post your doubts here!

    I don't get how are we supposed to calculate the percentage concentrations, like forexample we have to do simple dilution and in the first thing we take 20cm^3 of sucrose solution and 0cm3 of H2O and at the beginning it';s mentioned that the sucrose provided is 4 % so we'll say this 20cm3 is 4%...
  3. Mahnoorfatima

    A level Biology: Post your doubts here!

    Plan is always layers. When they ask you to draw 2 or 3 cells, forexample, then u draw it on high power and obviously the individual cells.
  4. Mahnoorfatima

    AS Physics (9702) Last Minute Revision Notes

    Oh No problem! But I've got a severe prob in potentiometers! Like in question 6 part b. I don't get this question AT ALL!https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9702_w14_qp_23.pdf
  5. Mahnoorfatima

    AS Physics (9702) Last Minute Revision Notes

    No notes for electricity? :/ I needeed those the most! Anyway thankyou! :)
  6. Mahnoorfatima

    Physics: Post your doubts here!

    http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s08_qp_2.pdf Question 4 part b and c anyone? PLEASE!
  7. Mahnoorfatima

    Physics: Post your doubts here!

    And for bii, how did you know that we have to use a potential divider formula? :/
  8. Mahnoorfatima

    Physics: Post your doubts here!

    Sorry to bother you time and again, but could you check question 2, in ai, It's mentioned that the speed before the brakes are applied so shouldn't we use the distance 29.3? Whereas in the MS 12.8 is used? 12.8 is the distance after the brakes are applied, no? And for the same question ii, we're...
  9. Mahnoorfatima

    Physics: Post your doubts here!

    http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s09_qp_2.pdf 1st variant question 5 part b?? 2nd variant question 5 part c? How are we supposed to know such type of answers? :/ AND question 7 part a? SOMEONE, PLEASE.
  10. Mahnoorfatima

    Physics: Post your doubts here!

    http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w08_qp_2.pdf Question 6 part bi, the ER says that describe what will be seen as a result of diffraction of water waves. What do I write in that? And bii? question 7 a?and bii? And 8 c as well...
  11. Mahnoorfatima

    Chemistry: Post your doubts here!

    Then what is 0.1??
  12. Mahnoorfatima

    Chemistry: Post your doubts here!

    If someone has any Tips or notes for calulations please post them ASAP!
  13. Mahnoorfatima

    Chemistry: Post your doubts here!

    Is the MAX error of a single burette reading o.05 or 0.1?
  14. Mahnoorfatima

    Chemistry: Post your doubts here!

    Okay so only 3 elements in P3 react with H2O i.e Na,Mg and Cl. Na would float on H2O,and catch fire. An exotherminc reaction will occur. Na+H20- NaOH+H2 Ph is 14 Mg's reaction will be slow, bubbles of H2 will form after a long time. But it's reaction with steam will be faster. PH is 9 Cl2 will...
  15. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_s08_qp_2.pdf For question 5, part cii, can we write the structural formula of the p.alcohol as HOCH2CH2OH? In MS its written as HOH2CCHO? What's the diff? Will my ans be considered wrong?
  16. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w08_qp_2.pdf How do I draw the hess cycle in Question 2 part cii?
  17. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w05_qp_2.pdf In question 5 part f, shouldn't the aldehyde change into OO-C-R as the reaction of Tollen's reagent woth aldehyde yeilds: CH3CHO+(Ag(NH3)2)+----> CH3COO- ?? Anyone?
  18. Mahnoorfatima

    Chemistry: Post your doubts here!

    i mean alkenes. Stupid autocorrect.
  19. Mahnoorfatima

    Chemistry: Post your doubts here!

    Can someone please explain how alkanes are polymerised. I forgot. :/. And what are the conditions. For eg polymerisation of C3H6 and showing 2 repeat units. Plus do we need to know how cracking occurs like long chain hydrocarbons and short chain hydrocarbon formation?
  20. Mahnoorfatima

    A level Biology: Post your doubts here!

    No. there's this question where its says why there's difference in pressures in the ventricles but not the atria so in the MS it's written that there's greater sesistance in systemic circulation..
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