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  1. F

    Physics, Chemistry and Biology: Post your doubts here!

    but Cl2 bleaches litmus paper.. is it the same for universal indicator?
  2. F

    Physics, Chemistry and Biology: Post your doubts here!

    the Q says they are 'ions' in a solution therefore they have to be soluble otherwise they would be a precipitate. so you just need to determine which compounds are soluble and which are insolube
  3. F

    Physics, Chemistry and Biology: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w09_qp_11.pdf why is 13 D?
  4. F

    Physics, Chemistry and Biology: Post your doubts here!

    is the O-level syllabus the same as IGCSE?
  5. F

    Physics, Chemistry and Biology: Post your doubts here!

    when the say ions in solutions they mean they are soluble. so the answers B as all nitrates are soluble plus barium sulphate and silver chloride arent soluble.
  6. F

    Physics, Chemistry and Biology: Post your doubts here!

    im sorry i dont understand :confused:
  7. F

    Physics, Chemistry and Biology: Post your doubts here!

    from the really old paper about some energy diagram is the answer endothermic or exothermic? and also for the hydrogen q., from the paper in 1990's? Electricity from a power station passes through overhead cables to a substation and then to a school where it is used to electrolyse...
  8. F

    Physics, Chemistry and Biology: Post your doubts here!

    An excess of copper(II) oxide is added to dilute sulfuric acid to make crystals of hydrated copper(II) sulfate. The processes listed may be used to obtain crystals of hydrated copper(II) sulfate. 1 concentrate the resulting solution 2 filter 3 heat the crystals 4 wash the crystals Which...
  9. F

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Electricity from a power station passes through overhead cables to a substation and then to a school where it is used to electrolyse concentrated hydrochloric acid using inert electrodes. Which substances are used for the overhead cables and for the electrodes? overhead cables...
  10. F

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    An excess of copper(II) oxide is added to dilute sulfuric acid to make crystals of hydrated copper(II) sulfate. The processes listed may be used to obtain crystals of hydrated copper(II) sulfate. 1 concentrate the resulting solution 2 filter 3 heat the crystals 4 wash the crystals Which...
  11. F

    Biology paper 12 discussion

    im done with paper 12.. please add me as well
  12. F

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

    1998 may/june Q15
  13. F

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

    why does the ms say A? :s
  14. F

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

    you have to read the Q properly it says 'what is the result of this'. so it means the because energy is lost at every organism a food chain will be limited to 5 or less organisms. i read it in the examiner report.
  15. F

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

    could you please explain why the answers A? which process can convert molecules to new substances by removing hydrogen atom? A)Displacement B)fermentation C)Neutralisation D)oxidation
  16. F

    Economics help

    http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Economics%20(0455)/0455_s09_qp_1.pdf Q8.. why is it C?
  17. F

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

    anyone has answers for 1993-2004 bio
  18. F

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

    anyone has answers for 1993-2004 bio
  19. F

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

    like.. in a reaaction there has to gain and loss of electron for it to be called a redox reaction.
  20. F

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

    but isnt redox reaction for reduction followed by oxidation in terms of electron transfer?
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