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  1. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Read C. It says: Dilute sulfuric acid was added to solid S in a test-tube. The mixture was heated to boiling point
  2. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Because sulphuric acid is present with solid S. The dilute nitric acid and barium chloride react with the sulphate ions.
  3. Y

    If you have any question on chem p6 im ready you guys. Don't Worry!!

    Exactly. I am resting for now. Gonna leave the rest for tomorrow.
  4. Y

    If you have any question on chem p6 im ready you guys. Don't Worry!!

    For question 7 here: http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_s10_qp_61.pdf Can we write it like this: 1. Using a mortal and a pestle, crush the large lumps to smaller lumps. 2. Add a more reactive metal to it like magnesium. 3. Heat it. 4. Displacement...
  5. Y

    If you have any question on chem p6 im ready you guys. Don't Worry!!

    Thanks.
  6. Y

    If you have any question on chem p6 im ready you guys. Don't Worry!!

    For May June 2010, Paper 61, question 7: http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_s10_qp_61.pdf Can some one explain to me why in the mark scheme it says "until goes pink"
  7. Y

    If you have any question on chem p6 im ready you guys. Don't Worry!!

    Nevermind lol brown in color.
  8. Y

    If you have any question on chem p6 im ready you guys. Don't Worry!!

    Guys, copper is always pink right?
  9. Y

    If you have any question on chem p6 im ready you guys. Don't Worry!!

    So Hydrogen burns with a pop sound when a lighted splint is brought near. Thanks.
  10. Y

    If you have any question on chem p6 im ready you guys. Don't Worry!!

    There is no organic Chemistry. By the way guys, can anyone explain to me the test for hydrogen? Do we just say pops with a lighted splint?
  11. Y

    Chemistry Paper 6 - Important notes and repeated questions.

    For titration, we are making a highly reactive metal salt that is soluble. For example, sodium chloride. The reagents will be sodium hydroxide and HCL. The base has to always be a soluble one like an alkali.
  12. Y

    Chemistry Paper 6 - Important notes and repeated questions.

    Thanks a lot! This almost covers the whole topics needed to know for Paper 6!
  13. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Yeah: Refractive index= 1/sin C C is the critical angle.
  14. Y

    Bio paper 31

    Of course that is right. Energy is the most important thing.
  15. Y

    Bio paper 31

    For the 2 enzymes I wrote the enzyme at ph 5 works best after 12 days and the one at ph8 works after 15 days the best.
  16. Y

    Bio paper 31

    Shivering. I don't mammals shiver in water. You can write shivering, if you stated that muscles contract and move their bodies frequently energy is released that warms the body. I don't think marks will be lost.
  17. Y

    Bio paper 31

    You can write: 1. Fur maintains the internal temperature. 2. Vasoconstriction 3. Regular movements in water that releases energy by aerobic respiration.
  18. Y

    90% for A*..!!!

    Dude how can that be possible? It is obvious that there is a curve. Take for example english, Bio etc. they are subjects that 80% of the time the highest grade in the whole IGCSE is between 75% to 85%. Very few or maybe Rarely somebody can score 90% on those subjects.
  19. Y

    Physics, Chemistry and Biology: Post your doubts here!

    For example in question 4 in ON11 about the Ferment. For the water jacket 8 points were stated, and the mark was 4. I wrote 5 points. Is that okay?
  20. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Oh! Good thing that I am writing a bit more points than stated.
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