• 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. E

    Physics, Chemistry and Biology: Post your doubts here!

    If u look at the rest of the boiling points u can see a pattern...41 37 and then it could be 33....ignoring the first one.... The only way u can answer these kinda questions is by finding a pattern kind of....
  2. E

    Physics, Chemistry and Biology: Post your doubts here!

    This image might help for part 3...
  3. E

    Physics, Chemistry and Biology: Post your doubts here!

    so if the question said pick a redox reaction, then a or c would be correct? Thx
  4. E

    Physics, Chemistry and Biology: Post your doubts here!

    Does anyone have some questions that repeat quite often and think I should practice them? Plz post the paper and Q number plzplzplz Thx I really need help revising like hard questions from past papers.....I suck at like the basics of chemistry....organic Im ok.....but like the general like...
  5. E

    Physics, Chemistry and Biology: Post your doubts here!

    on the same paper could u help me with 7)a and b plz? I sort of understand but Im still confused....
  6. E

    Physics, Chemistry and Biology: Post your doubts here!

    Thx a lot! I understand everything except the 5b.....even the third one loses and gains electons....why is it the first one? Plz explain Thx!
  7. E

    Physics, Chemistry and Biology: Post your doubts here!

    May/June 2011 Chemistry Paper 3 Q)1 Q)2ai Q)3c Q)4aiii Q)5a Q)5b Q)5c Sry if Im being an idiot...plz help me with those questions....thx :)
  8. E

    Physics, Chemistry and Biology: Post your doubts here!

    The number of Carbon-12 atoms in 12 grams of the substance is the mole.....and the avagadros constant is the number of atoms/molecules......
  9. E

    Physics, Chemistry and Biology: Post your doubts here!

    Thx :)
  10. E

    Physics, Chemistry and Biology: Post your doubts here!

    Could someone tell me how impurities ie. carbon and silicon are removed from the iron ore? FeS? Thx
  11. E

    IGCSE Chemistry Revision Guide | According to syllabus

    The notes were really helpful thx :D
  12. E

    Physics, Chemistry and Biology: Post your doubts here!

    I think yr teacher tried to simplify this and explain it to u....90 or higher for A* is not the percentage....the percentage is taken and compared to the rest of the world, then the number is decided and if u get more than 90 its an A*...
  13. E

    Chemistry Doubts: IGCSE Paper 3

    And help me on cathodic and scrificial protection plz...thx
  14. E

    Chemistry Doubts: IGCSE Paper 3

    I need help on like the basic stuff like colors of different stuff, general equations, types of reactions, rules/why and how stuff react.....and the equilibirum etc.... Plz help Thx a lot!!!!!!
  15. E

    Physics, Chemistry and Biology: Post your doubts here!

    There are a few things u need to know about electrolysis first....whenever its molten then the metal forms at the cathode and the other at the anode But when there is aqueous solution, then there are H+ and OH- ions to consider as well....and there are like 2 exceptions u need to remember...
  16. E

    Physics, Chemistry and Biology: Post your doubts here!

    I think I explained wrong....its got to do with like moles and stuff but it should be 1:1 so yeah its 4....
  17. E

    Physics, Chemistry and Biology: Post your doubts here!

    I dont understand plz explain...what will go to the other side and what and why will it get divided? Thx :)
  18. E

    Physics, Chemistry and Biology: Post your doubts here!

    because in the molecule, ratio should be 1:1 so if one is 0.104 then it should be 0.104:0.104 so u divide to get 4....
  19. E

    Physics, Chemistry and Biology: Post your doubts here!

    0.104/0.026 = 4....so n =4
  20. E

    Physics, Chemistry and Biology: Post your doubts here!

    because the higer the pressure the more ammonia is formed as they are squashed together more....due to less space the hydrogen and nitrogen have to join up as there is no space for them to move along by themselves... :)
Top