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  1. girlworld_club

    How to tell if an element is unstable?

    like in a multiple choice question in hsc you're given a list of elements.
  2. girlworld_club

    what are the stages for natural selection to occur?

    thank you
  3. girlworld_club

    How much forms of sampling techniques are there for "Research methadology" module?

    Re: How much forms of sampling techniques are there for "Research methadology" module just wondering what textbook you follow. Heinmann cafs has listed about 8-9
  4. girlworld_club

    How much forms of sampling techniques are there for "Research methadology" module?

    different textbooks highlight different ones.
  5. girlworld_club

    What would you change about the HSC and why?

    2 unit students should not be ranked against 3 unit students (for mathematics). There should be a seperate exam for each!
  6. girlworld_club

    What is a case study in cafs?

    Thank you. i have a question, which of the following is a raw form of data, that is unaltered when collected? cast study, questionnaire, literature review or structured interview?
  7. girlworld_club

    What is a case study in cafs?

    Can someone provide a general outline, + advantages and disadvantages. Thank you. I do not understand this methadology.
  8. girlworld_club

    help please. differentiation.

    break up the 8 from the whole fraction and times each term by 1/8 instead.
  9. girlworld_club

    Best textbooks for subjects 2013

    Chemistry: Jacaranda or conquering chemestry. Biology: Biology in focus Maths: cambridge
  10. girlworld_club

    Water concentration affecting pH??

    The higher the water concentration, the more CO2 that can dissolve in the water. As stated by Rifipi, the amount of c02 that can dissolve in water is proportional to the amount of water. Thus you get more carbonic acid forming. Through the reaction between c02 + h20 <--> H2c03. H2c03 dissociates...
  11. girlworld_club

    Chemistry Questions

    also what is the reaction between sodium hydroxide + hydronium ion ?
  12. girlworld_club

    Chemistry Questions

    A 250ml sample of 0.10 mol/L HCL is addded to 250ml of 0.025mol/L NaOH. Calculate the final pH of the mixture.
  13. girlworld_club

    HSC 2012-2015 Chemistry Marathon (archive)

    re: HSC Chemistry Marathon Archive Saying that Water released H+ ions due to self-ionisation. Shouldn't it also produce a comparable amount of OH- as well?
  14. girlworld_club

    Chemistry Questions

    Curious... what would happen to the PH of the salt solution if an aqueous salt solution of NaOH is distilled with 500g of water. Would it increase, decrease or remain the same?
  15. girlworld_club

    Chemistry books for self study

    conquering chemistry preliminary is the best, jacaranda for HSC.
  16. girlworld_club

    Integrate these for me please

    1/ (x+4) = (x+ 4)^ -1 = (x + 4) ^1 / 1 + c = (x+4) + c (i think). i do 2 unit, btw.
  17. girlworld_club

    Chemistry Questions

    Re: Does anyone have detailed notes on these two experiments. also are these question part of acidic environment, because i saw them in a half yearly paper? (a) At what time was the equilibrium achieved? (b) State the equilibrium concentration for ammonia. (c) What is the equilibrium...
  18. girlworld_club

    Chemistry Questions

    What is the OH-(aq) concentration (mol L-1) in a 0.0800 mol L-1 nitric acid solution? (A) 0 (B) 1.25 x 10-13 (C) 8.00 x 10-12 (D) 1.00 x 10-7
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