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  1. M

    Chemistry: Post your doubts here!

    First you since you asked only one question. For questions like this it's best to do some working as you read the question so that you have everything laid out in front of you. We know there's a white powder than contains both magnesium oxide and aluminium oxide. We also know that 100/1000 x 2 =...
  2. M

    Chemistry: Post your doubts here!

    I will get back to both of you soon.
  3. M

    How was Biology Paper 42 MAY/JUNE 2017?

    You called it mann!!! Haha nice. I saw those files too but are they legit for sure?
  4. M

    Chemistry: Post your doubts here!

    For Q32, we know that the first statement is true simply because of the existence of ONA at the end as well as the entire sulphate group. It's used as a detergent too so it makes sense some of it must be soluble, or so I think. 2 is correct because alkyl chains are hydrophobic, so while they...
  5. M

    Chemistry: Post your doubts here!

    Yeah more than enough bud don't worry about it. :D
  6. M

    Chemistry: Post your doubts here!

    Haha your original message said i) but anyway, in ii): Compound C as we established is 2,3-dihydroxy-propanoic acid, HOCH2CH(OH)COOH. Compound E is an alkanal/ethanal after oxidization, so it's ethanoic acid, CH3COOH. C: HOCH2CH(OH)COOH E: CH3COOH Now when C reacts with E, BOTH of it's...
  7. M

    Chemistry: Post your doubts here!

    First of all let's identify what C and D are. I assume you got that, but for the sake of clarity, I'll explain it again. For D, we reduced an aldehyde, an ethanal, so we get an alcohol, ethanol. For C, we first reacted C with HCN to get propanenitrile, which upon reacting with sulphuric acid...
  8. M

    Chemistry: Post your doubts here!

    No problem! Feel free to ask more via pm or on here. :D
  9. M

    Chemistry: Post your doubts here!

    Test is for ammonia gas so gas is ammonia. You can confirm this from the qualitative analysis notes too for p3, which you should have on your fingertips for all papers, not just p3. If ammonia has released then cation must be ammonium ion, NH4+. Finally, since during test we got rid of the...
  10. M

    Physics: Post your doubts here!

    No problem at all, feel free to pm and ask more or if you want just post them here, I'd love to help. :D
  11. M

    Physics: Post your doubts here!

    Let's just apply each equation and see where it leads us. 1. m1u1 + m2u2 = m1v1 + m2v2 Take m1 as given mass m and m2 as given mass 4m Take u1 as given velocity +u, take u2 as stationary = velocity is 0 mu + 0 = mv1 + 4mv2 mu = mv1 + 4mv2 mu = m(v1 + 4v2) u = v1 + 4v2 We are trying to...
  12. M

    A level Biology: Post your doubts here!

    They aren't asking what is happening AT stage D, they are asking what happens AFTER stage D, leading up to stage E.
  13. M

    A level Biology: Post your doubts here!

    Ohh no it IS prophase. What they meant in the mark scheme is that the examiner is supposed to "ignore prophase at D", this means that they acknowledge that it is prophase, but they will ignore any mention of it in your answer because the quesiton is asking what happens to chromosomes BETWEEN...
  14. M

    Chemistry: Post your doubts here!

    No problem at all, feel free to ask more questions. :)
  15. M

    Chemistry: Post your doubts here!

    Very, very interesting. CIE can be weird at times. But yes the equation in the answer mirrors what our book quotes for SiCl4, and yeah I noticed you mentioned SiCl4 before. It's the "non-metal" and "tetrachloride" part which they want us to think about here.
  16. M

    Chemistry: Post your doubts here!

    Interesting. However, I have a question. Our CIE syllabus mentions in section 9.2 that the only chlorides we need to be familiar with are of sodium to phosphorus, not up to sulfur. And there's no mention of it in the Nitrogen and sulfur section (section 13) either. So on what grounds is this...
  17. M

    Chemistry: Post your doubts here!

    Yeah youre right about the typo, it seems that way. However, the reason isn't the size. Van der Waals' depend on the number of electrons per unit forming them. Nitrogen exists as a diatomic gas so even though it seems that neon should have greater Van der Waals' based on what I said, because it...
  18. M

    However, this thread, first page, last post, and the rest of the thread too I think you'll find...

    However, this thread, first page, last post, and the rest of the thread too I think you'll find useful for Paper 2: https://www.xtremepapers.com/community/threads/how-was-biology-paper-22-may-june-2017.46530/ I hope I helped. :)
  19. M

    Paper 2 was relatively easy I can't seem to recall much of what came due to sleep deprivation in...

    Paper 2 was relatively easy I can't seem to recall much of what came due to sleep deprivation in those days and the fact that paper 4 had us worried so much that paper 2 seemed to go somewhere in the back of my mind. I wish you asked me earlier then and there I would have been able to narrate to...
  20. M

    Other than it was a weird paper with difficult questions, you can go through this thread...

    Other than it was a weird paper with difficult questions, you can go through this thread.: https://www.xtremepapers.com/community/threads/how-was-biology-paper-42-may-june-2017.46605/ Go through all of it carefully to extract as much info as you can.
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