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  1. A

    Physics: Post your doubts here!

    neither mass nor energy is conserved separately, but that they could be traded one for the other and only the total "mass-energy" is conserved
  2. A

    Physics: Post your doubts here!

    We can answer this by thinking about the energy which is carried away by the particles (alpha or beta) and electromagnetic radiation (gamma) produced in the decay.Albert Einstein realised that we can think of energy as having mass. So if the mass of the nucleus decreases we must look around and...
  3. A

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w13_qp_21.pdf Can any please explain Q5 b
  4. A

    Chemistry: Post your doubts here!

    Anyone can give tips for titration questions
  5. A

    CHEMISTRY AS P33 PRACTICAL MAY 8 2014

    Any tips for titration questions?
  6. A

    Chemistry: Post your doubts here!

    Sorry but there is no such question in the pastpapers and this is the entire question which i have.
  7. A

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_22.pdf Can anyone please explain Q1 especially Q1 (c) i).
  8. A

    Chemistry: Post your doubts here!

    Thanks a lot for your explanation it really helped. can you please help me with this question also, I had posted it three times but there is no answer yet calculate average bond energy of C-C bond in ethane given ΔHf(C2H6) = -85 KJ/mol , ΔHat(H)gas =218 KJ/mol and ΔHat(graphite) = 715 KJ/mol
  9. A

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s13_qp_22.pdf Q5 d i) Can anyone please tell why it is ethanoic acid
  10. A

    Chemistry: Post your doubts here!

    PLEASE can anyone explain this question!!!!!. calculate average bond energy of C-C bond in ethane given ΔHf(C2H6) = -85 KJ/mol , ΔHat(H)gas =218 KJ/mol and ΔHat(graphite) = 715 KJ/mol
  11. A

    Chemistry: Post your doubts here!

    Can anyone please help me with this question calculate average bond energy of C-C bond in ethane given ΔHf(C2H6) = -85 KJ/mol , ΔHat(H)gas =218 KJ/mol and ΔHat(graphite) = 715 KJ/mol
  12. A

    Chemistry: Post your doubts here!

    Can anyone please help me with this question calculate average bond energy of C-C bond in ethane given ΔHf(C2H6) = -85 KJ/mol , ΔHat(H)gas =218 KJ/mol and ΔHat(graphite) = 715 KJ/mol
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