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  1. I

    Differential Equations Maths P3 HELP!!

    For diffrential equations just separate the x and y,and then integrate both sides. For iteration,you just have to make x the subject of the formula Exam solutions has some really good videos http://examsolutions.co.uk/maths-revision/syllabuses/CIE/period-1/P3/module.php Good luck :D
  2. I

    Results: CIE Oct/Nov 2012 Examination Series

    Good luck :)
  3. I

    How was Chemistry Paper 12?

    Moles -.-
  4. I

    CHEMISTRY PAPER 1

    Draw a vector diagram,the one with the least vectors gives the largest dipole :D Good luck
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    Chemistry: Post your doubts here!

    For 18.The double bond in the centre break and give 2 extra OH groups so the total wll be 3 and with Hot mno4,the double bond will break to give you a ketone and carboxylic acd.and also the other OH group will get oxidised to carboxylic,so your'e left with 3 rings For 28.You know that free...
  6. I

    Chemistry MCQ thread...

    For question 6,find out how many grams of N there are in 1g of fertiliser,this would be 15/100 which is 0.15 g of nitrogen in a gram of fertiliser.So in 14 g there would be 0.15*14 =2.1 grams. Concentration=Moles/volume. Now find moles = mass/MR =2.1/13=0.15 then conc=0.15/5 which gives...
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    Chemistry MCQ thread...

    Draw a vector diagram pointing out the dipoles eg in A it would be an arrow from C to CL and hence you draw four arrows.Do it for all four structures.The one with the least arrows give you the largest dipole
  8. I

    The Easiest A level Subject

    Are you sure you want to take 7 subjects? Most universities only require 4.I know people who thought they could do 6 subjects,and these people got all A* in o level.AS level is hard,don't underestimate it. Anyway,think about this twice and Good luck :)
  9. I

    HOW WAS CHEMISTRY PAPER 22 ?

    One colour change
  10. I

    HOW WAS CHEMISTRY PAPER 22 ?

    how many grams of zinc ethonate need to be taken for 15 mg of zinc? ai got something less than 1 i think it was 0.05 or something
  11. I

    HOW WAS CHEMISTRY PAPER 22 ?

    Do displayed optical isomers have to be in 3D
  12. I

    HOW WAS CHEMISTRY PAPER 22 ?

    It was okay,hope the grade threshold is low Are october sessions papers usually marked less harsher than may session ones ?
  13. I

    Anytime :) Are you giving any other papers? And how did your exam go today? :)

    Anytime :) Are you giving any other papers? And how did your exam go today? :)
  14. I

    How was Math Paper 62

    It wasn't that bad actually,or as compared to last year winter session,i may have messed up the premutation and combination question :(
  15. I

    Statistics 1: Post Your Doubts Here

    Variance = npq=30*0.4*0.6
  16. I

    Statistics P6 : post your doubts here!

    Q1 i) If the mean is 8.95,then Σ(x-a)/n + a = mean So 8.95= -73.2/24 + a,then just solve for a :) ii) standard deviation = sqr root ( Σ(x-a)^2/n -(Σ(x-a)/n)^2) THis can be found in the formula booklet q7 ii) P of taking a red paper clip from Box B is either to put a white clip from A into B...
  17. I

    Statistics P6 : post your doubts here!

    to find Σ(x-50) means that from all the numbers/variables you have collected,subtract 50 from each one. Lets say you have the number 51,52,53 , Σx=51+52+53 and Σ(x-50)=1+2+3 so to find Σ(x-50) just find the sum of number and subtract (50*16) because you are subtracting 50 16 times as there are...
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    Statistics 1: Post Your Doubts Here

    Q6-part 2 Draw up a normal dist curve and you need to find the area before -1 and after one Then find the probability which would be 0.3174,then multiply it by 1000 to get the number of feathers http://olevel.sourceforge.net/papers/9709/9709_s12_qp_63.pdf Q2 ii) If you take a look at the...
  19. I

    Statistics P6 : post your doubts here!

    Since the survey will definately include 1 house of style C and 1 from B,there are two houses remaining to chose from Eliminating Style C and B houses you have 7 different kinds of houses to chose from. So 1 of style B gives 2C1 1 of style C gives 3C1 and for the remaninig your'e left with...
  20. I

    Statistics P6 : post your doubts here!

    Can someone help me with 4 part III from M/J/12 variant 63 Thanks :)
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