• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. forest822

    Chemistry: Post your doubts here!

    Yes Answer is B
  2. forest822

    Chemistry: Post your doubts here!

    For 2, why C is not the answer? Usually PV=constant right?
  3. forest822

    Chemistry: Post your doubts here!

    Thanks for the solution. Btw, how do I know how to form C6H5O7Na3 ? I know the calculation part but not this.
  4. forest822

    Chemistry: Post your doubts here!

  5. forest822

    Chemistry: Post your doubts here!

    Why this is enthalpy change of hydration instead of enthalpy change of solution? Thank you !
  6. forest822

    Chemistry: Post your doubts here!

    Water is added to anhydrous aluminium chloride to make a 0.1 mol dm-3 solution. Which observations are correct? 1 The reaction is endothermic. Why this statement is incorrect?
  7. forest822

    Physics: Post your doubts here!

    Thank your for the solution. How's Hooke law is related to Young Modulus? Thank You.
  8. forest822

    Physics: Post your doubts here!

    Can anyone explain why it is not appropriate to use the Young Modulus to determine the extension when the braking force is applied? Thank You.
  9. forest822

    Mathematics: Post your doubts here!

    Can anyone explain these questions? Thank You. 1. Three of the nine cards are chosen and placed in a line, making a 3 digit number. Find how many different numbers can be made in this way if there are no repeated digits. (ANS: 60 ways) Why cannot do something like this. 9C3 x 3! 2. Find the...
  10. forest822

    Physics: Post your doubts here!

    Can anyone explain to me these questions? Thanks a lot. Paper 1: May/02/40, June/04/39, June/05/39 Why not A?, June/07/40 Why not D?, Nov/08/38
  11. forest822

    Chemistry: Post your doubts here!

    Can anyone explain this to me? Thank You.! E. Change of formation of CO2= -395kjmol^-1 E. Change of formation of H2O= -297kimol^-1 E. Change of combustion of C2H6= -1620kJmol^-1 Calculate the enthalpy of the formation of ethane. [-2(395)+3(-297)]-(-1620) = -61kJmol^-1 WHY?
  12. forest822

    Mathematics: Post your doubts here!

    Can anyone explain to me how to solve these questions? Thank You. Intergrate the following functions with respect to x. 1. x^2 cos x 2. In (x-1) 3. (In x)^2
  13. forest822

    Mathematics: Post your doubts here!

    Thank you for your explantions. May I know why WD BY DRIVING FORCE= WD by Kinetic energy + WD BY FRICTION + Gain in gpe? I can't imagine it.
  14. forest822

    Mathematics: Post your doubts here!

    Hello. Can anyone explain my doubts? Thank You. 1. A lorry of mass 15000kg climbs from bottom to the top of a straight hill, of length 1440m, at a constant speed of 15ms-1. The top of the hill is 16m above the level of the bottom of the hill. The resistance to motion is constant and equal to...
  15. forest822

    Chemistry: Post your doubts here!

    Hello. Can anyone please explain to me these questions? Thank you 1. The density of this nitrogen to be 1.2572gdm-3 at stp. Chemically, pure nitrogen has a density of 1.2505gdm-3 at stp. Which gas was present in atmospheric nitrogen to cause this discrepancy? A. Argon B. Helium C. Methane D...
  16. forest822

    Chemistry: Post your doubts here!

  17. forest822

    Chemistry: Post your doubts here!

    Can anyone explain to me these few questions? 1. The density of ice is 1.00gcm-3. What is the volume of steam produced when 1.00cm3 of ice is heated to 323 degree celcius (596K) at a pressure of one atm (101 kPa) [ 1 mol of gas occupies 24.0dm3 at 25 degree celcius (298K) and one atm. Ans...
Top