• 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. S

    Paper 5 question!

    http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w11_qp_51.pdf plz tell me what scale to take an the x-axis!! i cant figure it out..!
  2. S

    P5 chemistry..help

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w11_qp_51.pdf plz tell me what scale to take an the x-axis!! i cant figure it out..!
  3. S

    Chemistry: Post your doubts here!

    umm so if formation of bonds is exothermic.shouldnt the minus signs multiply to become positive?
  4. S

    Chemistry: Post your doubts here!

    is there a formula for calculatiing enthalpy change of rxn using bond energies?
  5. S

    Chemistry: Post your doubts here!

    EXACTLY. i"ve posted this question so many times in different threads here but no one has answered it yet..i hope someone does soon because im really confused!
  6. S

    Physics / Chemistry / Bio P5 help

    sppendix of marking scheme? :S
  7. S

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w11_qp_21.pdf Q3d...isnt the formula of calculating enthalpy change..Enthalpy change of products - enthalpy change of reactants...?? ms is doing the opposite..
  8. S

    Chemistry: Post your doubts here!

    syllabus states: b) explain qualitatively in terms of intermolecular forces and molecular size: (i) the conditions necessary for a gas to approach ideal behaviour (ii) the limitations of ideality at very high pressures and very low temperatures ans to i is high temp and low pressure...what...
  9. S

    AS Chemistry P2 Prep.

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w11_qp_21.pdf Q3d...isnt the formula of calculating enthalpy change..Enthalpy change of products - enthalpy change of reactants...?? ms is doing the opposite..
  10. S

    AS Chemistry P2 Prep.

    are you sure? isnt elimination the removal of water? :O
  11. S

    AS Chemistry P2 Prep.

    guys..can we have some chem discussion now? :P please answer my question that i"ve posted above!!
  12. S

    AS Chemistry P2 Prep.

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w11_qp_21.pdf Q3d...isnt the formula of calculating enthalpy change..Enthalpy change of products - enthalpy change of reactants...?? ms is doing the opposite..
  13. S

    Physics / Chemistry / Bio P5 help

    reasons for anomalies..dont understand that. :(
  14. S

    AS Chemistry P2 Prep.

    in preparation of alkenes ..when alcohols or alkyl halides are converted into alkenes..the rxn is an elimination reaction??
  15. S

    Physics / Chemistry / Bio P5 help

    can we have a false origin in our graphs?
  16. S

    AS Chemistry P2 Prep.

    yeah but i cant seem to get the answer..could you do the working please?
  17. S

    Chemistry: Post your doubts here!

    when 50cm^3 of a hydrocarbon Y is burnt it reacts with exactly 300 cm^3 of oxygen to form 200 cm^3 of C02. water is also formed. deduce the equation for this reaction. answer: C4H8 + 6O2 → 4CO2 + 4H2O..please tell the how to work this one out..its frm chemistry coursebook.
  18. S

    AS Chemistry P2 Prep.

    BOTH oxidation n reduction occur.
  19. S

    AS Chemistry P2 Prep.

    when 50cm^3 of a hydrocarbon Y is burnt it reacts with exactly 300 cm^3 of oxygen to form 200 cm^3 of C02. water is also formed. deduce the equation for this reaction. answer: C4H8 + 6O2 → 4CO2 + 4H2O..please tell the how to work this one out..its frm chemistry coursebook.
  20. S

    AS Chemistry P2 Prep.

    yesh i was considering outer electrons only..thanks :)
Top