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  1. S

    Chemistry: Post your doubts here!

    HELP!! What happens when you react sodium chloride with nitric acid?
  2. S

    A level Biology: Post your doubts here!

    It is related to the arrangement of the amino acids in the receptor site. That needs to be complementary
  3. S

    Mathematics: Post your doubts here!

    Can someone pleas e solve this
  4. S

    Physics: Post your doubts here!

    Isn't it mgh= (6x10^24)*(1.3x10^4)*9.81 ?
  5. S

    Chemistry: Post your doubts here!

    Yeah I don't get this either.. I think it's to do with their ionization energies but i can't be sure. Could someone please answer this
  6. S

    Physics: Post your doubts here!

    Could sb please tell me why, when generating electrical power, the electrical power output would be less than the power available from a source such as the wind or the sun. How would power be lost
  7. S

    A level Biology: Post your doubts here!

    They're used in protein synthesis. MRNA is made in the nucleus and this contains instructions for protein synthesis. It goes to the ribosomes where amino acids are rearranged to build the specific kind of protein
  8. S

    A level Biology: Post your doubts here!

    How do membrane bound proteins play a role in transporting materials in and out of the cell??
  9. S

    A level Biology: Post your doubts here!

    What organelle other than the nucleus has DNA?! Could someone please reply,!?
  10. S

    Chemistry: Post your doubts here!

    Could someone please answer these 1) discuss the use if the periodic table in the classification of elements as metals and non metals. 2) write down the two ion half equations for the reaction of the IO3 (-1) anion with the iodine ion [I (-1)] in acidic solution
  11. S

    Additional Mathematics 4037/22

    How were b and c the same? I formed two equations, one through pythagorus and the other through the distance formula...and then I dont know what the hell I did o.O how many marks was the area question for, the very last one?
  12. S

    Additional Mathematics 4037/22

    How'd u find the coordinates of C? :S and how many marks was the last question for?
  13. S

    Additional Mathematics 4037/22

    How? It was so lengthy...I was writing till after the bell rang! What were the coordinates of D btw? You can answer it tomorrow :P
  14. S

    Addmaths paper 1

    So displacement was 0
  15. S

    Addmaths paper 1

    Yeah I was getting 11/16 when I used that method..so I left it like that and plugged in calues from 0 till 10 in the x2 equation till I got the answer..th
  16. S

    Maths, Addmaths and Statistics: Post your doubts here!

    I found the gradient of the tangent, and then I divided it by -1. I used the values at that point to find the equation of the normal, and then I put in x=0 in that equation to find the y coordinate of P..so where did I go wrong? :/
  17. S

    Maths, Addmaths and Statistics: Post your doubts here!

    My gradient of the normal was really weird. It was -(1/9) or something
  18. S

    Maths, Addmaths and Statistics: Post your doubts here!

    Are u sure? Wait we had to find the gradient if the tangent first, and then the gradient of the normal. I found the y coordinate then and then formed the equation of the normal, plugged in x=0 and I got [3pi - (something)] :S did I do something wrong? There weren't any calculation errors cause I...
  19. S

    Maths, Addmaths and Statistics: Post your doubts here!

    I left it in terms of pi...they did that in red spot so I assumed we could do it
  20. S

    Addmaths paper 1

    What are the M and A marks? How many marks will they cut?
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