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  1. Unknown202

    Chemistry: Post your doubts here!

    can u plz explain why not Mn2+ instead of Mno4- cuz in the question he asked for mn2+
  2. Unknown202

    Chemistry: Post your doubts here!

  3. Unknown202

    A level Biology: Post your doubts here!

    Can someone help why C and not B???
  4. Unknown202

    Chemistry: Post your doubts here!

    And plz help in question 1 Nov 2011 v11 do I hv to learn the properties?
  5. Unknown202

    Chemistry: Post your doubts here!

    Thx u soon much
  6. Unknown202

    Chemistry: Post your doubts here!

    Hmm multiply by 10?!
  7. Unknown202

    Chemistry: Post your doubts here!

    In these one why 250/25?!?!
  8. Unknown202

    Chemistry: Post your doubts here!

    The commonest form of iron(II) sulfate is the heptahydrate, FeSO4.7H2O. On heating at 90 C this loses some of its water of crystallisation to form a different hydrated form of iron(II) sulfate, FeSO4.xH2O. 3.40 g of FeSO4.xH2O was dissolved in water to form 250 cm3 of solution. A 25.0 cm3...
  9. Unknown202

    Physics: Post your doubts here!

    http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-13.html answer here
  10. Unknown202

    Physics: Post your doubts here!

    an answer is 2???not 3
  11. Unknown202

    Physics: Post your doubts here!

    and Microwaves are used to transmit television signals to and from a satellite. Which statement about microwaves is correct? A They have a longer wavelength than radio waves. B They penetrate the atmosphere without significant loss of energy. C They travel much faster than radio waves in a...
  12. Unknown202

    Physics: Post your doubts here!

    Water of depth 10m exerts a pressure equal to atmospheric pressure. An air bubble rises to the surface of a lake which is 20m deep. When the bubble reaches the surface, its volume is 6.0cm3 . What is the volume of the air bubble at the bottom of the lake? help plzzz
  13. Unknown202

    Physics: Post your doubts here!

    Guys for Igcse physics in graph can we start the graph from the number given for ex-20,30,35,40,45,50,55 can I start the graph with 20 rather than (0,0) And should the scale be>50%
  14. Unknown202

    A level Biology: Post your doubts here!

    i need a help in this question
  15. Unknown202

    A level Biology: Post your doubts here!

    this is accounting i want 9700
  16. Unknown202

    A level Biology: Post your doubts here!

    i know its a simple question but i just want to know what is added(in 2016) or removed(from 2014) from AS biology syllabus
  17. Unknown202

    Physics: Post your doubts here!

    The helium in the cylinder has a volume of 6.0 × 10–3 m3 (0.0060 m3) and is at a pressure of 2.75 × 106 Pa. (i) The pressure of helium in each balloon is 1.1 × 105 Pa. The volume of helium in an inflated balloon is 3.0 × 10–3 (0.0030 m3). The temperature of the helium does not change. Calculate...
  18. Unknown202

    Physics, Chemistry and Biology: Post your doubts here!

    I want notes on change In momentum cuz in mayjune2016 p21 question 8 he asked wht happen to the ball as it hits the wall but the speed is same someone tell me why momentum chqnged
  19. Unknown202

    Physics, Chemistry and Biology: Post your doubts here!

    guys got any useful notes about change in momentum?
  20. Unknown202

    Physics, Chemistry and Biology: Post your doubts here!

    thx soo much studyingrobot
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