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  1. N

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

    okkay
  2. N

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

    http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_s06_qp_1.pdf whats the concept behind question 35? the answer is C
  3. N

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

    why isnt hydrogen part of the composition of clean air?
  4. N

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

    .32
  5. N

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

    guys u know the q abt the galvanised roof?the answer in the mark scheme shows that zinc is also included in the composititon, but in the previous discussion we had, we said the opposite :s oct nov 2004
  6. N

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

    hahah blonde jokes :P
  7. N

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

    ah yes yes yes now i get it. Its not the water that has an effect on the acid, but the acid that has an effect on the water.... wow im stupid
  8. N

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

    wait guys water has an effect on the pH of the acid. 2003 mayjune chem : 21 Water is added to a test-tube containing dilute sulphuric acid of pH 4. What could be the pH of the resulting solution? A 8 B 6 C 4 D 2 answer is B!
  9. N

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

    f forget it , its wrong in the mark scheme..
  10. N

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

    okay wait, if u get x2y3 what does this mean? It means y has a valency of 2 and x has a valency of 3, no? No its not contradicting, im also saying that 2 atoms of x form and 3 for y.
  11. N

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

    listen if ur confused, understand that the valency of y is 2, and the valency of x is 3. U swap them u get x2y3. This swapping helps u understand how many atoms are present for each element. therefore there are 2 atoms of x and 3 of y. read this slowly sentence by sentence and ull get it
  12. N

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

    array bayya where did those brackets come from?
  13. N

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

  14. N

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

    i dont think that 3 and 2 mean the valencies of the elements. Think abt it 2 atoms of X were deposited then there obviously has to be two atoms of X in the formula... here my weird analogy :s
  15. N

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

    according to the mark scheme (which i got from freeexampapers.com) the answer is A. Isnt it supposed to be C? This question is from the 2000 may june paper Chemistry
  16. N

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

    guys just a quick question for chem 31 the question abt the oxidant needed for ethanol ---> ethanoic acid conversion it cud be potassium manganate or dichromate. Was it necessary to mention the oxidation number?
  17. N

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

    the one where you had to draw the structural formualae?
  18. N

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

    aiaiayay i frgot the question abt the coffee beans one ..i do hope chromatography is also right cuz i wrote that.
  19. N

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

    because thats just it. You have to know wen metals like sodium, potassium and calcium react with cold water a hydroxide plus hydrogen gas is formed. Magnesium and metals down cant react with cold water but instead steam to give an oxide and hydrogen
  20. N

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

    condensation, cuz heat is given off g to l
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