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  1. K

    Chemistry: Post your doubts here!

    Hey guys, anyone wrote paper 52 today? How'd it go?
  2. K

    Physics: Post your doubts here!

    Hi, firstly this is a physics forum and your question is chemistry-related. Please be mindful henceforth :) As to your question, it's quite a memory based answer. You need to know that MgCl2 dissolves in water to give Mg(OH)2+HCl; Since one product is basic and the other is acidic, your best...
  3. K

    Physics: Post your doubts here!

    I know it's quite late, but I hope the explanation helps nonetheless. The spring is moving vertically up and down, with equilibrium point being in the centre. At "lowest point of its motion" the mass has MAXIMUM displacement downwards. And at maximum displacement, we know that potential energy...
  4. K

    Chemistry: Post your doubts here!

    Is the answer C? It's a very simple working, Mr=200 is extra information given to throw you off. number of molecules= Avagadro's number* number of moles=6.02*10^23 x 3*10^(-21) = 1806.
  5. K

    Chemistry: Post your doubts here!

    So the graph is characteristics for an ENDO thermic reaction which is deltaH +ve value. For the reverse reaction, energy needs to be supplied to increase the potential energy of products to the energy level of intermediate(which has a greater potential energy). So this also requires an INPUT of...
  6. K

    Chemistry: Post your doubts here!

    yeah you're actually supposed to get 1/2
  7. K

    Chemistry: Post your doubts here!

    If you draw the propene molecule, it will help. so the molecule looks something like this: CH2=CH-CH3. Now we have Br2 which is (i) Br-Br and HBr which is (ii) H-Br. In case (i) the nucleophile will attack. the double bond will break and one extra bond will be available on C1 and one more on...
  8. K

    P1 9709 AS (ZONE 4) OCT NOV 2019

    These are my answers- 1) a= -4 2) 3y+2x=14 3)y=5root(X) - 6 [ I don't remember the order here onwards so I'm just categorizing the questions according to the chapter] 4) the vector question *PB= 5i+8j-5k *PQ=4i+8j+5k * closer to Q than B * angle was something like 57.4 5) the circle question...
  9. K

    Mathematics: Post your doubts here!

    Hey guys so it's been close to 22 hours after the AS Maths exam 9709 12, I'm writing down the answers that I remember, please do recheck and let me know if something doesn't match: 1) a= -4 2) 3y+2x=14 3)y=5root(X) - 6 [ I don't remember the order here onwards so I'm just categorizing the...
  10. K

    Mathematics: Post your doubts here!

    It does, Thank You so much!
  11. K

    Chemistry: Post your doubts here!

    The question has been previously explained- https://xtremepape.rs/threads/chemistry-post-your-doubts-here.9859/post-827046 all the best :)
  12. K

    Chemistry: Post your doubts here!

    This question has been previously explained- https://xtremepape.rs/threads/chemistry-post-your-doubts-here.9859/post-998865 hope it helps :)
  13. K

    Mathematics: Post your doubts here!

    STATISTICS HELP NEEDED I got the first two parts but I am so confused about solving (iii). Can anyone help me out by providing a good explanation so that I can, too, develop that way of thinking.
  14. K

    Application booklets

    Okay, thank you so much! I appreciate the help :)
  15. K

    Is IELTS needed to given if O Level English is Given?

    Hey, I actually say otherwise. If you have an A in English O levels then you might actually be given an exemption from submitting any more English proficiency tests. Most universities in Singapore and Hong Kong, as I have been looking, have several different tests through which they assess your...
  16. K

    Application booklets

    Guys are application booklets not a thing anymore or what? I can't seem to find any!
  17. K

    Chemistry: Post your doubts here!

    Hey guys, A level electrolysis question up ahead- the question is on the right and the mark scheme on the left. According to my calculations, 1519.685 C of charge was used and therefore time = 1519.685/0.5 which is also what they said. My answer is, however, t=3039 seconds and NOT 5034...
  18. K

    A level Biology: Post your doubts here!

    Shouldn't the answer be B?
  19. K

    A level Biology: Post your doubts here!

    hey guys, endocytosis makes sense to me somewhere but when I overthink (as usual) I'm realising that in this case, the molecule doesn't necessarily "diffuse through a cell surface membrane." Help me?
  20. K

    Physics: Post your doubts here!

    Yes, as long as I don't lose these marks lol :))
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