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  1. AbbbbY

    Biology; Chemistry; Physics: Post your doubts here!

    Even though it's been a while since I studied Bio and am rather rusty, if I recall correctly, in an absence of light the plant will respire. This will mean it will give out CO2 instead of O2 Therefore, Tube 1 should be Acidic and Tube 2 should be Neutral. Hence, Yellow and Orange. Is this...
  2. AbbbbY

    Chemistry: Post your doubts here!

    Also, guys, if you have OCRs in your PDF readers and it allows you to copy, please copy the question and put it here. So much quicker to solve that we! More questions can be solved that way and can solve even when short on time.
  3. AbbbbY

    Chemistry: Post your doubts here!

    Sorry just saw your questions. ON11 P11 Q14 B CaCO3 -> CaO + CO2 Mass of Limestone: 1000+200 = 1200m ton Mol = 1200/100 = 12 mol 1 mol = 44m ton 12 mol = 44*12 mton = 528m tonnes. I must've rounded off something in the Ar but the closest answer gets it hence B. Do it properly and...
  4. AbbbbY

    Chemistry: Post your doubts here!

    2- D! Two methods. I'll tell you the quicker one. CxHy -> xCO2 + y/2H2O 35.2/44 = 0.8 mol 14.4/18 = 0.8 mol 0.2 mol -> 0.8 mol + 0.8 mol = 1 -> 4 : 4 Next, you write up the combustion equations and balance them to see which one falls under the molar ratio. simply by looking at the ratio I...
  5. AbbbbY

    Tips to get A* in A'levels

    Depends question to question.
  6. AbbbbY

    Maths, Addmaths and Statistics: Post your doubts here!

    Naturally, the answer you have crossed out will not be treated as your answer and hence you won't gain the mark.
  7. AbbbbY

    Tips to get A* in A'levels

    Have you guys seriously never read marking schemes? -__- You'll lose one accuracy mark. For the rest, ecf will be applied. As long as your working is correct you'll lose the first mark but will gain all subsequent marks.
  8. AbbbbY

    Advice For Physics

    Full wave rectification is with 4 diodes. Diamond setup. I don't recall AC Rectification to be a part of O level Physics, though. :S
  9. AbbbbY

    Chemistry: Post your doubts here!

    ON09 Q9 - Sorry I suck at Electo. Maybe someone else can answer this for you and invariably for me. MJ12 P12 Q7 P -> <- Q + R Start: 2 mol : 0 mol : 0 mol Eq: 2-x : x/2 : x mol Total moles, 2+x/2 Moles of P and R = (2-x)+x = 2 Moles of Q: 2+(x/2)-2 = x/2 Having done such questions enough...
  10. AbbbbY

    Chemistry: Post your doubts here!

    Simple! 1 mol : 24 dm3 x mol : 3 dm3 x= 0.125 mol Next, you simply see which gas has 0.125 moles. So the answer is C/D [8g of SO2] whichever isn't the incorrectly written 8g of SO2.
  11. AbbbbY

    Guide and Tips-O Levels

    Umm I'm far, far from an Art person, but off the top of my mind, you could perhaps maintain a portfolio. In addition to that, you could help kids in NGO's and rural schools etc with artwork and get recognition for it. It's a very broad topic. Let me know what major/majors you're interested in...
  12. AbbbbY

    Environmental Management

    Had an exam so couldn't do it yesterday. Trying to locate my book. Will do ASAP.
  13. AbbbbY

    Environmental Management

    2013 Jan paper!??!
  14. AbbbbY

    Distinctions O-Levels.

    Distinction: World top/Country top/City top. In addition to that, Best across 7, 8, 9 O Levels 3, 4, 5 A Levels etc. You get a recognition for achieving the top percentile in the subject. Impact on uni apps, yes definitely!
  15. AbbbbY

    Chemistry: Post your doubts here!

    You need explanations for these or are you answering them for someone?
  16. AbbbbY

    Environmental Management

    Any valid point.
  17. AbbbbY

    Environmental Management

    They're on the last page of each of the four chapters of the book. If you want, I could take a pic and upload that
  18. AbbbbY

    Maths, Addmaths and Statistics: Post your doubts here!

    Look, (1-x) (1+x) =x^2 -1^2 So, multiply the first fraction by 1 +x, the second by 1-x and the third by nothing. This will give you x^2 -1 in the denominator. Solve the numerators and simply.
  19. AbbbbY

    IS ECONOMICS NEEDED FOR SCIENCE STUDENTS?

    I'm pretty sure you can! :) GOod luck! Here's to hoping you enjoy it as much as I did.
  20. AbbbbY

    Mathematics: Post your doubts here!

    No file attached...
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