• 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. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    It has to be in Group I for its second ionisation energy to be higher. Ca2+ : H+ = 1:2. Use n=cv to find the moles of H+, then use c=n/v and mole ratios to find the conc. of Ca2+.
  2. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Voltage is the energy needed to drive charge through. Energy gets used up as a current flows through a wire, so D is ruled out. A is ruled out because the voltage drop can't be smooth because the wire is of varying resistance. The gradient of the V/x graph = current, because x is proportional to...
  3. h4rriet

    As physics p1 MCQS YEARLY ONLY.

    Ammonium compounds release ammonia when reacted with an alkali. Compound D is ammonium nitrate.
  4. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Is the answer D? Write the balanced equations for the combustion of 1 mole of all those compounds. For example, CH4+2O2->CO2+2H2O. 1 mole required 2 moles, so 10 moles (you can take the volume to be the number of moles) will require 20. 70-20=on the graph. Plus the volume of CO2.
  5. h4rriet

    As physics p1 MCQS YEARLY ONLY.

    All you have to do is write down the balanced equations for the combustion of Mg, Al and S and then simplify them so that the mole ratio of Mg/Al/S to O2 is 1:x.
  6. h4rriet

    PAPER 1 MAY/JUNE 2013 PHYSICS DOUBTS HERE

    Impulse. Which is also delta momentum.
  7. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    Year/variant what?
  8. h4rriet

    PAPER 1 MAY/JUNE 2013 PHYSICS DOUBTS HERE

    M/J/09: 9. I=m(v-u). Give the velocities signs. 10. 11. Pressure increases as depth increases. Since the area is the same (p=F/A), the force too increases like that. 13. 1.2F=0.2 x 900. 15. 18. p=densityxgxh. h=the difference in height between the two tubes.
  9. h4rriet

    Physics: Post your doubts here!

    27. What I meant was that Work Done on a point charge equals to the voltage x the charge. The charge for all the four is the same. 25. In tube X, the fundamental frequency will be 1/4 lambda. In tube Y, it'll be 1/2 lambda. f - 1/4, so x - 1/2.
  10. h4rriet

    Physics: Post your doubts here!

    25. f - 1/2 lambda. So 1 lambda (2 loops) - x. 27. W=Vq, which is the same for all the charges. 35. E=I(r+R), so I=E/(r+R).
  11. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    10. 2H2O <-> 2H2 + O2 I = 100(H2) 0(H2) 0(O2) C = -2x(2H2O) +2x(2H2) +x(O2) E = 80(2H2O) x=1o, so the equilibrium concentration of H2=20, and of O2=10. 39. To dehydrate an alcohol, the C of the C-OH has to be attached to a C attached to an H. The C which it is attached to is attached to 4...
  12. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    4. Use (bonds broken - bonds formed). 8. You have to draw a Hess cycle: 11. You have to draw an ICE chart, i.e. initial concentrations, change in concentrations and equilibrium concentration. Then work out the final concentrations and from that work out the Kc. 13. The number of electrons lost...
  13. h4rriet

    PAPER 1 MAY/JUNE 2013 PHYSICS DOUBTS HERE

    Find the deceleration using a=F/m, and then choose a suvat equation to work out the final velocity.
  14. h4rriet

    PAPER 1 MAY/JUNE 2013 PHYSICS DOUBTS HERE

    Pressure=rho x g x h. Rho=given, g=given, h=vertical height=5. Work it out and add to that the atmospheric pressure.
  15. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    AgX is formed when there are X- ions. X- ions are released when the C-X bond is broken. C-Br and C-I are weaker than C-Cl so they will be broken more easily and AgBr and AgI will be formed faster than AgCl. Option 1 is included because there are two C-Cl bonds so there will be more Cl- ions...
  16. h4rriet

    AS Physics P1 MCQs Preparation Thread.

    13. The gravitational pull is the same everywhere on Earth because the mass is the same and so is g. 25. 1/4 lambda in tube X is f. 1/4 lambda is tube Y will be x. Cross multiply to get x=2. 31. Not B because a wire is not a magnet, not C because there is always motion, not D because it's the...
  17. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    The 2 compounds are an aldehyde and a ketone. You use Fehling's reagent to distinguish between a ketone and an aldehyde.
  18. h4rriet

    Physics: Post your doubts here!

    10. F=4ma. a=F/4m. F(Y)=3m x F/4m = 3F/4. 22. F on each spring = W/3. F=kx. k=F/x=W/3x. x=F/k=W/W/3x=3x. 30. Average current=100+20=120/2=60. Q=It=60x8=480.
  19. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    30. 30+30=60-18(water)=42. 22/42 x 100 = 52%.
  20. h4rriet

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    1. You have to construct a balanced equation for the reaction given. 2. 100 g of fertiliser contains 15 g of N, so 14 g will be in x grams of fertiliser. c=n/v=x/5. 6. m=density x volume =1 gram. n=m/Mr=1/18=0.055555. Now use pV=nRT, taking care of the units. 15. Write a balanced equation for...
Top