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  1. L

    Computer studies ! Post your doubts here =)

    Hmm, okay. There's many answers in the marking scheme. Here are some of them: 1. File management. 2. Handling interrupts. 3. Providing a user interface. 4. Networking 5. Memory management. And you're welcome. :)
  2. L

    AS Chemistry P2 Prep.

    Wow... you are right. Good thinking. :)
  3. L

    Computer studies ! Post your doubts here =)

    May 2011 P12. I didn't give Paper 3 as I did the project.
  4. L

    Computer studies ! Post your doubts here =)

    Do at least 3-4 years of past papers, 2011 backwards. The thing is, there are many questions which may be different, but are of the same nature and some even repeats, like name 3 processes an OS does. I think that has come in at least 5 papers and it's an easy 3-mark question. :P Also, attempt...
  5. L

    Chemistry: Post your doubts here!

    They arise due to the lack of rotation around the C=C bond.
  6. L

    Computer studies ! Post your doubts here =)

    I prepared by studying from those booklets, studying from my teacher's notes, practicing algorithms and finally doing about 8 years of past papers. Paper went very well and got an A* by the grace of Allah. BTW, if you are not sure if something is in the syllabus, check the 2012 syllabus out. :P...
  7. L

    Chemistry: Post your doubts here!

    WA. Please give this a read, it helped me quite a bit. Also, let me try to explain with an example, CH4. The central atom is C and it is surrounded by 4 hydrogens. First find the number of electrons being shared. In this case, it is 4 from carbon and 1 from each hydrogen, totaling up to 8...
  8. L

    Computer studies ! Post your doubts here =)

    Maybe. :P But his definition was also right, just the error part isn't always true so I don't think it should be in the definition. :P
  9. L

    Computer studies ! Post your doubts here =)

    But interrupts don't happen all the time which is what your definition is implying. Here are some examples: Certain commands in programming codes generate software interrupts to, for example, create a new process or request something from the OS. A system timer could send an interrupt after a...
  10. L

    AS Chemistry P2 Prep.

    Yep. Elimination or dehydration is the name of the reaction.
  11. L

    Computer studies ! Post your doubts here =)

    But it doesn't necessary mean an error has occurred.
  12. L

    hey ppl help chem doubt

    1. Nope. Alkenes can be oxidized by KMnO4 though. 2. Yes. But if you want an aldehyde, you have to use K2Cr2O7 and heat + distill off the product immediately. KMnO4 will directly give you an acid. 3. Yes, but if they ask you a reagent which reduces the C=O bond, you have to quote either NaBH4 in...
  13. L

    Chemistry: Post your doubts here!

    Because a carboxylic acid can react with more than on -OH group. BTW, it said in the marking scheme that monoesters were allowed, so even if you didn't have 2 esters but correctly did 1 then I think they marked it right.
  14. L

    Chemistry: Post your doubts here!

    LiAlH4 in dry ether OR NaBH4 in water.
  15. L

    AS Chemistry P2 Prep.

    I think you are assuming ROH is NaOH. It's not, ROH is the alcohol. If 0.04 reacted with NaOH, it means the remaining 0.06 moles reacted with the alcohol.
  16. L

    Yep. :)

    Yep. :)
  17. L

    maths p32 answers

    Did you do the parts of the questions in order? As long as you did that, I think you should be OK.
  18. L

    statistics paper 6

    Q7 First read the question carefully. You want 6 people, with at least 4 men and 1 women in each part of the question. (i) At least 4M and 1W, so the following combinations are possible: 4M, 2W 5M, 1W That's (10C4 * 9C2) + (10C5 * 9C1) = 9828. (ii) Let Albert be X and Tracey be Y (treat them...
  19. L

    Chemistry: Post your doubts here!

    You are getting confused between 2 different reactions. In nucleophilic substitution, this happens: - KCN in an ethanoic solution is added to a a halogenoalkane. - It happens with heat under reflux and the resulting compound contains an extra carbon atom. Like this: CH3CH2Br + CN- -> CH3CH2CN...
  20. L

    What to do in Chemistry?? :(

    Well, how is your preparation so far? Have you actually done any past papers? If so, approximately how many marks are you getting in a paper? You don't have to do every past paper there is, just do the ones from like 2011-2007 to get a gist of how the questions are. Also, make sure you know your...
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