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  1. A

    Chemistry: Post your doubts here!

    was'nt it a reversable reaction?? with unequal mol on both sides? if that is the case then ans was increase
  2. A

    Chemistry: Post your doubts here!

    Actually in cracking reactions you can make any alkane or alkene (given that no of carbon atoms and hydrogen atoms are less or equal to the reactant (Alkane Or Alkene ) Btw I thaught only cracking of alkanes is possible.... anyidea if cracking of Alkynes or Arenes possible or not???
  3. A

    Chemistry: Post your doubts here!

    4 B .... in Al2Cl6 1 Al atom has 4 bonds thus 8 electrons .....In CH3+ = 4 electron of carbon naturally 3 electron given by H -1 due to + chage so 4+3-1 = 6 ....In Cl2O ..(just like H20) oxygen in g6 + 2 bonded electrons = 8 ....In H2ClC. C radical (1 electron un paired) means...
  4. A

    Chemistry: Post your doubts here!

    Can Anyone Tell what's the accuracy of Burette ,pippete ,meauring cylinder and Thermometer? (how many d.p would i write if i measure from each one of these?)
  5. A

    How was 9709 S1 62 ??

    I used o levels method, but yeah it was wrong considering that method was only suppose to work on discrete data i think(my teacher should have told) , and length is continious...
  6. A

    How was 9709 S1 62 ??

    was'nt the iqr 2? considering it was Raw data?
  7. A

    Chemistry: Post your doubts here!

    No ...On one double bond 2 hydrogens were attached...
  8. A

    Chemistry: Post your doubts here!

    Yes you are correct, I guess some People don't take mayjune seriously...and then retake In Oct NOv with full preparation...btw I think the Gt would be between 60-65 for P4
  9. A

    Chemistry: Post your doubts here!

    rate against time?? never heard of that ... It was Rate against concentration...
  10. A

    Mathematics: Post your doubts here!

    B Btw Check this out Friction coefficient can be as high as 21 provided you conduct the experiment in VACUM which was'nt mentioned on the paper ...BUT it did'nt specify of air Either(JK...lol)
  11. A

    Mathematics: Post your doubts here!

    I got mew 5.2 I know its wrong (beacause mew is usially between 0 to 1) can anyone point out where i went wrong? Plus How much marks can i expect for this question?
  12. A

    Mathematics: Post your doubts here!

    206,000 W
  13. A

    Chemistry: Post your doubts here!

    i am not sure about that ...but since the question asked "Chemical equation" not "ionic equation" I think h20 was compulsary.
  14. A

    Chemistry: Post your doubts here!

    all aqueous excpet h20 (l)
  15. A

    Chemistry: Post your doubts here!

    yeah this NH4+ H20<--› NH3 + H+(or h30+) (the equilibrium sign was a must)
  16. A

    Chemistry: Post your doubts here!

    Check this reaction amonia is acting as an acid even though its a gas....arhenius theory(what you leant in o levels) can t explain this Thats why In A levels They taught you Bronsted Lowery Theory of Acids..
  17. A

    Chemistry: Post your doubts here!

    no you have wrote the definition of a weak arehenius acid arhenius acid = a substance that dissolves in water to form H+ ions bronsted lowery acid = proton doner (these acids can exist in any state not only aqueous) anyways the definiton should have been A weak bronsted lowery acid is one...
  18. A

    Chemistry: Post your doubts here!

    You have to cram these graphs ...(e.g NaOH and Hcl would have first graph)
  19. A

    AS math 9709/May June/2018/ Paper 12 Hard Or Easy?

    p12
  20. A

    AS math 9709/May June/2018/ Paper 12 Hard Or Easy?

    It was tricky..btw what were the range of angles we had to find by using graphs of trig ratios (i guessed 270 <x<360 probably wrong)
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