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  1. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    You mean pollen not anther right? :unsure:
  2. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Nov 2006 the male gametes are more than the female as there will be more pollens than egg cells. Even in the humans millions of sperms are produced for a few amount of egg cells which is usually one Nov 2008 it is half of a flower so there will be some left in the other side that wasn't shown
  3. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Nope it should be B hydrated CoCl2 is pink and it is an exothermic reaction as forming of bonds will give energy. Steam will trick you as it will increase the temperature so the opposite reaction will have to be decrease but it doesn't depend on steam it depends if the bonds were broken or...
  4. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Yes it is it can be used but it has the same problem as H2 in transport as it is a gas. I couldn't believe it when my teacher told me too. ;)
  5. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    CO is a fuel while N is not a fuel. There was a similar question that said Oxygen instead of Nitrogen. The fuels that I know are CO CH4 H2 all hydrocarbons and some others but N2 and O2 are defenatliy not a fuel
  6. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    The one near the front of the mouth isn't a molar it is a pre-molar so it doesn't count. Molars are often bigger than pre-molars and with different shape so if you count it makes it 4
  7. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Thank you :)
  8. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    It is decreased because when decreasing the mass by half will cause the temperature to drop more as the reaction is endothermic at least that is what i understood from the examiner report :unsure:
  9. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    how is it A i'm sure it is B
  10. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    It shouldn't be increased it should be decreased as Endothermic reaction will take the energy from the surrounding and it should be 5 because half the volume of water is used
  11. Khaled Ayman

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    The answer is D why did you think it is A
  12. Khaled Ayman

    igcse math paper 2

    did you write PM or not
  13. Khaled Ayman

    igcse math paper 2

    if you saw the first one was 4y and the second was 2y so you have to multiply it bt two to give you 2.5 i realized that at the last minute. I swear
  14. Khaled Ayman

    igcse math paper 2

    Day Wednesday Time 22 15
  15. Khaled Ayman

    igcse math paper 2

    the sacle question you have to square 1/10 then divide it be the area and cube 1/10 then multiply it with the volume 408000 iw will 408...:)
  16. Khaled Ayman

    igcse math paper 2

    Shift the button under the ALPHA it will give you something like this d/dx (O) x=0. In the (O) write the formula of the line and in o the point where you want to find the gradient then equal... EX. the one that came in the exam was at x=1 so you it will be d/dx ({x/2}+{2/x}) x=1 the answer will...
  17. Khaled Ayman

    igcse math paper 2

    The gradient is equal to -1.5 Should be + or - 1... so your answer is fine. You can get the exact value of gradient by the calculator. I used it and it turned out to be -1.5
  18. Khaled Ayman

    Does anyone have Paper 4 before MONDAY

    Mine is @ 11 00 AM at KSA... Hope it is easy ;)
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