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  1. Alex10

    Chemistry Paper 51

    If solubility increases with temperature doesn't it mean the forward reaction is endothermic? So delta H would be positive?
  2. Alex10

    How was Mathematics Paper 32 2015

    dx/dt = xe^-t / (k - e^-t)
  3. Alex10

    Bio P4: How was it?

    Agreed.
  4. Alex10

    Chemistry p41: How'd it go peeps?

    Wouldn't it be less compact because there are more branching points?
  5. Alex10

    Chemistry p41: How'd it go peeps?

    It was alright, not too bad.
  6. Alex10

    Chemistry and Biology P4 guesses?

    Calculate the number of moles of acid left, so 0.0025-0.001 = 0.0015 (due to 1:1 mole ratio) and find its concentration by 0.0015/0.002 which gives 0.075 moldm^-3. One mole of NaOH reacts to form one mole of sodium ethanoate, so the concentration of the salt is 0.001/0.002 = 0.05 moldm^-3...
  7. Alex10

    Biology paper 51 anyone?

    It wasn't too bad
  8. Alex10

    Biology P5 - Tips on Electrophoresis and Chromatography anyone?

    Electrophoresis: make sure to include a buffer soluation in your agarose gel plate and that the samples are near the cathode. The sequence of fragments from the ANODE to cathode is shortest to longest. Standardise the pH of the buffer, the voltage applied and the time. Chromatography: Include...
  9. Alex10

    Psychology (9698) May/June 2014 Past Papers and Mark Schemes

    Here you go
  10. Alex10

    AAAA

    AAAA
    • Alex10
    • Profile post comment
  11. Alex10

    Chemistry p32

    Use C1 x V1 = C2 x V2 So for experiment 1: 0.23 x 50 = C2 x 130
  12. Alex10

    How was biology p32 (no discussion)

    What stages of mitosis did you guys label in Fig. 2.1?
  13. Alex10

    How was biology p32 (no discussion)

    I got 17s for 20% as well!
  14. Alex10

    biology practical

    Paper 32 will probably involve investigating the effect of something on the activity of an enzyme that coagulates milk.
  15. Alex10

    AS Psychology- Doubts, Tips, Guesses and Leaks

    I'm just going over the studies again, making sure I know the exact procedures and data collection methods etc. Then I will look at all the issues of ethnocentrism, generalisations, ethics and all that and memorise points about the advantages and problems psychologists have when using these.
  16. Alex10

    AS Psychology- Doubts, Tips, Guesses and Leaks

    Haha a 'snapchat' study eh? Does that mean it disappeared in 10 seconds? ;) I got a question about longitudinal studies and strengths and weaknesses of the social approach.
  17. Alex10

    Mechanics 1 P42 2014; Discussion!

    So I have a question. For #6, I got the correct deceleration, however is stupidly forgot to take the weight of the particle into account when finding R. So I got R=13.5 instead of 15.5N. Consequently I used this for my resolving of the Tension, which I got as 15.59N instead of 17.59N. How many...
  18. Alex10

    AS Psychology- Doubts, Tips, Guesses and Leaks

    Wait, what were your section B questions? I think I may have done the 11 paper, sorry :D
  19. Alex10

    AS Psychology- Doubts, Tips, Guesses and Leaks

    Oh okay, I did the same. Yeah some short answered questions were a bit surprising, but I couldn't have asked for better Section B questions.
  20. Alex10

    AS Psychology- Doubts, Tips, Guesses and Leaks

    Which variant did you do?
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