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  1. S

    Chemistry: Post your doubts here!

    Could you still post them?
  2. S

    Chemistry: Post your doubts here!

    What about the color of the flames? Only magnesium is yellow and sulfur is blue.. Do the rest burn with a white flame?
  3. S

    Mathematics: Post your doubts here!

    Yeah you did...but that's the p3 formula right? Are you giving p3 this year too?
  4. S

    Chemistry: Post your doubts here!

    Can someone describe the reactions in periodicity and group 2 metals with oxygen, water and chlorine? And the observations
  5. S

    Mathematics: Post your doubts here!

    Where did u get the equation 2sin^2(2a)=1-cos4a from?
  6. S

    A level Biology: Post your doubts here!

    What now I'm confused. Sucrose increases the concentration of the solute, so the solute potential should become more negative and hence lower, shouldn't it?
  7. S

    Mathematics: Post your doubts here!

    I don't get it...how is (x-2)^2 + 3 relevant?
  8. S

    A level Biology: Post your doubts here!

    Solute potentials the same as osmotic pressure if that clarifies things
  9. S

    A level Biology: Post your doubts here!

    No who told you that? Pure water has the highest water potential and lowest solute potential
  10. S

    A level Biology: Post your doubts here!

    A high solute potential has a low water potential
  11. S

    Mathematics: Post your doubts here!

    Shouldn't it be h= fg^(-1) since we're changing the position of g(x)?
  12. S

    A level Biology: Post your doubts here!

    No actually low solute potential means less solute molecules. Google it
  13. S

    Chemistry: Post your doubts here!

    To convert an alcohol into oliec acid (an acid with a double bond), why do you add dilute hcl?
  14. S

    A level Biology: Post your doubts here!

    Can the answers on xtremepapers be wrong?
  15. S

    A level Biology: Post your doubts here!

    27 is B according to the marking scheme on xtremepapers. And why doesn't unpasteurized milk spread cholera?
  16. S

    A level Biology: Post your doubts here!

    In the second one, doesnt the trachea have epithelium rather than epidermis?
  17. S

    A level Biology: Post your doubts here!

    Could someone one please answer these! Cause according to the marking scheme, tissue fluid has the same composition as blood plasma (including protei content)...but it could be wrong cause they're not the actual cie marking schemes
  18. S

    Chemistry: Post your doubts here!

    Thanks! But shouldn't it be: Mg + 0.5 O2 --> MgO?
  19. S

    Chemistry: Post your doubts here!

    But sodium nitrate is soluble.. Could you explain this question instead?
  20. S

    Chemistry: Post your doubts here!

    And in this too: Which element of the 3rd period requires the least number if moles of oxygen for the complete combustion of 1 mil of the element? A) aluminum B) magnesium C) phosphorus D) sodium
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