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Recent content by Henry Smith

  1. H

    Physics, Chemistry and Biology: Post your doubts here!

    Hi Raven,I've corrected what you pointed out, just missing the word "height". Actually, PbCl2 is insoluble that is why the precipitate deposits on the bottom of the test tube, lead nitrate ran out so further tubes should have the same height of solids in them. The number entry was measured by...
  2. H

    Physics, Chemistry and Biology: Post your doubts here!

    Hi Raven, Could you please check this p61_may_2012 for me as well, point out the mistakes and I will amend them. Thanks in advance! Another paper for you Maria! Link to the paper : https://www.yousendit.com/download/UVJnY05xZy9ubVZESjlVag
  3. H

    Physics, Chemistry and Biology: Post your doubts here!

    The two commercial methods of reducing ZnO to Zn appear to be Thermal, in the presence of C: 2 ZnO + C → 2 Zn + CO2 and electrowinning: ZnO + H2SO4 → ZnSO4 + H2O (followed by electrolysis on the ZnSO4) Today over 90% zinc is produced hydrometallurgically in electrolytic plants. Check this...
  4. H

    Physics, Chemistry and Biology: Post your doubts here!

    It's my pleasure Maria, just do it for fun, I'll step into bio and physics. I have done some AS chemistry papers as well, will find some time to upload. Please my corrected version of the previous paper bellow that Raven has pointed out some mistakes early on...
  5. H

    Physics, Chemistry and Biology: Post your doubts here!

    Hi Raven, For Q.1c, actually acidic fumes react with water vapour and rain water on the way down , you still get mark if you mention water, more information can be found at http://www.umac.org/ocp/HowisAcidRainFormed/info.html For Q.4b : I know that in the MS they says transition metals all...
  6. H

    Physics, Chemistry and Biology: Post your doubts here!

    Hi guys, Please help me to check out my answers for Paper 3 chemistry May/June 2012 and give me your feedback so I can improve my answers in the coming papers. My worked paper can be grabbed from : https://www.yousendit.com/download/UVJpSkhVNkduSlFVV01UQw Cheers
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