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  1. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    guys WHO did B8 was the element with the ethanol LITHIUM ??? 4 MARKS :p
  2. Abdul Hanan

    How was paper went of CHEMISTRY 5070/22

    no you are wrong... the equation was to be of neutralisation that is H+ + OH- =h20
  3. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    it was 18 :( HOW WAS IT 22?? :(
  4. Abdul Hanan

    How was paper went of CHEMISTRY 5070/22

    it asked for "class" of the compound not the compound so maybe thats wrong....
  5. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    Br2 + 2At- =2Br- +At2
  6. Abdul Hanan

    How was paper went of CHEMISTRY 5070/22

    me too same CO
  7. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    I did iron what did you do ???
  8. Abdul Hanan

    How was paper went of CHEMISTRY 5070/22

    answer was "sugars" i got it wrong :/
  9. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    for conditions of the question on glucose fermentation we had to write the equation (question said so) i wrote equation and conditions i wrote :enzyme zymase,20-40 degree temp.,absence of oxygen....... i did not write about yeast... any chance i get 3/3 ?
  10. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    there's an easy way to know what thing is ester... look for CO2C......or....... COOC (same thing) and if you find it..... its an ester :p
  11. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    it's estero_O
  12. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    B is the only acid present which can react with sodium carbonate
  13. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    combustion with oxygen forms carbon dioxide and water (2 products)
  14. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    gain in electrons gives -ve charge which is reduction (this can also be said as "decrease in oxidation state") loss of electrons gives +ve charge which is oxidation (this can also be said as "increase in oxidation state")
  15. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    ok... this is a displacement reaction Zn+CuSO4=ZnSO4+Cu here zinc looses electrons so it is oxidised..... (ZnSO4 ppt. not formed as it is soluble)
  16. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    answer ? :P
  17. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    the reaction will be: CaCO3+HCL=CaCl2+H2O+CO2 carbon dioxide escapes the container.... other products remain inside leading to overall decrease in mass caco3 is marble first there are more particles so faster decrease initially then slower
  18. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    only "road tyres" seems like a vague response did you wrote what of road tyres like alloy rim breaking etc?
  19. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    railway tracks bend due to expansion and are reason of most railway accidents
  20. Abdul Hanan

    Biology; Chemistry; Physics: Post your doubts here!

    advantage: opening metal lids of bottles (i saw this in past paper) disadvantage:(railway tracks) is it okay?
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