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  1. Q

    Unit 3B Chemistry :) How was the exams? Comment here :P

    its not correct, its the mass of the solution.
  2. Q

    Unit 3B Chemistry :) How was the exams? Comment here :P

    its obviously 50g coz its the mass of the solution, the solid doesn't matter. For how do you know if iodine is still present, I put pink colour because iodine is pink in alcoholic solvent right?
  3. Q

    AFTER 24 hr .. P1 discussion here !

    wasnt the range x>= -2.5 and not equal to 0?
  4. Q

    Mathematics: Post your doubts here!

    :P your welcome
  5. Q

    Mathematics: Post your doubts here!

    OK so (x-(2x^-1))^6 It asks you for decending powers of x so you want x^6 to be your first term So then its x^6 + 6C1(((x)^5)((-2x)^1)) +6C2(((x)^4)((-2x^-1)^2)) that simplifies to x^6 -12x^4 + 60x^2 ii) so (1+x^2)(x-2x^-1)^6 = (1+x^2)(x^6-12x^4+60x^2......) You only want the powers of 4 so...
  6. Q

    Mathematics: Post your doubts here!

    Yes, It says on the formula sheet That |r|<1 for a sum to infinity. And a convergent series is a series which converges to 1 value and thus is the sum to infinity series. Are we supposed to know r for an oscillating divergent and divergent series too? I guess for oscillating divergent r < -1 or...
  7. Q

    Mathematics: Post your doubts here!

    u1 = a = 1 u2 = ar = (1/3)tan^2(theta) a = 1 therefore 1/3tan^2(theta) = r For a convergent series abs(r) < 1 or -1< r<1 but the limits define are 0<theta<pi/2 So for r must be greater than 0 and less than 1 because our limits say we can't have a negative value for theta. so 1/3(tan(theta))^2 <...
  8. Q

    Mathematics: Post your doubts here!

    Good point, that would be a quicker method.
  9. Q

    Mathematics: Post your doubts here!

    The range for those two functions is going to be the exact same, the only thing that is changing is the period. -2sin(x) means the graph will be flipped and the amplitude will be twice. 3+ means the graph will be translated +3 in the y direction so the range for both is 1=<f(x)<=5
  10. Q

    Mathematics: Post your doubts here!

    Just go to your calculator table function and type in: f(x) = 3 − 4(cos(x))^2 type in your limits and step. So start = 0 end = pi step = pi/4 Now you can immediatly see the highest and lowest value's of f(x) i.e. your range so it is: -1=<f(x)<=3 OR Since you know that the max value of...
  11. Q

    OMG CHEMISTRY UNIT 1 PAPER!!!!!!!!!!!!

    Did you guys not do Phys unit 2 last year? june/may
  12. Q

    OMG CHEMISTRY UNIT 1 PAPER!!!!!!!!!!!!

    Cheers
  13. Q

    OMG CHEMISTRY UNIT 1 PAPER!!!!!!!!!!!!

    This is the answer (up)
  14. Q

    OMG CHEMISTRY UNIT 1 PAPER!!!!!!!!!!!!

    Too bad I haven't done physics unit 2 yet :S
  15. Q

    OMG CHEMISTRY UNIT 1 PAPER!!!!!!!!!!!!

    Lol it was only 1 mark so who cares :D I just did an arrow going down, never seen this shit before
  16. Q

    OMG CHEMISTRY UNIT 1 PAPER!!!!!!!!!!!!

    Yeh i did small molecular or whatever, coz i remember a question coming up before on white phosphorus vs silicon and silicon has the giant molecular structure
  17. Q

    Prediction of Grade Thresholds for May-June 2012!

    Why are you looking at winter, its summer
  18. Q

    Coordinated science paper 6 discussion

    Yeh we did a different paper then that would be 7pm GMT
  19. Q

    Coordinated science paper 6 discussion

    oh right ok, when at what time gmt did you do, I did mine at 13:30 GMT
  20. Q

    Coordinated science paper 6 discussion

    The question was about a green solid in suspension which had been filtered out to make a filtrate and a residue. For the last question I remember it saying you had to use question b iii) in your answer which was about the filtrate being tested for ammonia and failing. The question asked you to...
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