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  1. B

    Post your chemistry questions here.

    There are many tests for phospate ions, one is making the solution alkali and adding barium ions, adding magnesium ions and ammonium ions, and the last is adding ammonium molybdate, (NH_{4})_{2}MoO_{4}, and ascorbic acid (the only purpose for this acid is to provide hydrogen ions), and the...
  2. B

    Exam mechanics question

    hahahaha aiight cool, anyway best of luck with things :D
  3. B

    Exam mechanics question

    yeh exactly but first of all to begin with a speed higher than the terminal velocity you must be shot out or something but she jumped for the plane, aka initial velocity equals zero and yes obviously I get that that's what people above you explained, I didn't read the question fully and I...
  4. B

    Exam mechanics question

    Ok first I going to clarify what terminal velocity is, you have 2 forces acting on you when in mid air, air resistance and gravity, now you are always acclerating downwards due to gravity, however when the air resistance is equal to the gravity you acceleration becomes zero and you have reached...
  5. B

    Exam mechanics question

    Like Khorne said it is when the acceleration is equal to zero, therefore you cannot gain any more speed to go faster, and obviously you can travel at that speed but it's the maximum speed reachable
  6. B

    Is citric acid triprotic ??

    lol that doesn't really have anything to do with whether it is triprotic or not, it just means the citric ionises more than acetic when in solution. The triprotic just means it is able to produce 3 hydrogen ions per molecule which you could talk about
  7. B

    Is citric acid triprotic ??

    Lol yeh it is and what the hell, which paper is that?? Btw it's a propanol alcohol and 3 hydrogens are replaced with 3 carboxylate fuctional groups, those carboxylate groups are what produce the hydrogen ions
  8. B

    Biopol

    Lol yeh biopol is a copolymer between poly-3-hydroxybutyrate and poly-3-valerate, and I am sure it is 3hydroxybutyrate, I did an assignment on it. If you want it just let me know
  9. B

    Board of studies, fail ?

    thats's aiight :D best of luck with the rest of your exams :D
  10. B

    Board of studies, fail ?

    That's good n lol it's aiight
  11. B

    Board of studies, fail ?

    Nah that should be fine but just in your equation, the salt on the product side, there is meant to be 3 sodium attached to the negative ion. Be careful because in the exam the marker may be picky and had a bad day lol
  12. B

    Board of studies, fail ?

    The equation for the reaction of citric acid with sodium hydoxide is: C_{6}H_{8}O_{7}_{(aq)}+3NaOH_{(aq)}\rightarrow 3H_{2}O_{(l)}+Na_{3}C_{6}H_{5}O_{7}_{(aq)} The molar ratio of citric acid : NaOH ---> water : salt, can therefore be seen as: 1 : 3 ---> 3 : 1 now number of moles of NaOH = CxV...
  13. B

    Titration help!!

    Lol aiight just putting it out there nah they have to ask something about it, but maybe not a big question like that and it wouldn't hurt to know the stuff
  14. B

    Titration help!!

    That is generally true however if the titration for the first one is close to the others then it should be included, the difference must be within 0.1 from memory, and then you discard the rest
  15. B

    Titration help!!

    It must first be washed with distilled water to remove any dirt and unwanted substances. It must then be washed out with the solution you will put into the burette as this will remove the distilled water remaining in the it, this must be done as if some distilled water remains then the solution...
  16. B

    The difference between a base and an alkali?

    Bases react with acids to form salt and water. Bases include insoluble metal oxides and insoluble metal hydoxides. Alkalis are group 1 and group 2 soluble hydroxides. These soluble hydroxides are NaOH, LiOH, KOH, Ca(OH)2, Sr(OH)2, Ba(OH)2 and the only other alkali (which we need to know) is the...
  17. B

    Which Chemistry Option scales the best?

    Not sure how this will work, but most schools do Industrial chemistry, so there will be a lot of people competing in that option so you might need to get higher marks to stay in the top band
  18. B

    Proof for a modulus, inequality induction =D

    Lol I'm not trying to beat a dead horse here but I'm just saying this was the question 8 hahahahaha may have not been exactly but they just changed it a little with the beta and alpha
  19. B

    HSC students' maths paper 'cruel and difficult' (SMH)

    Re: Bogans Complain about Maths Ext.1 Test to Newspaper hahahahahahahahahahahahaha everyone will have to resit it :p
  20. B

    HSC students' maths paper 'cruel and difficult' (SMH)

    Re: Bogans Complain about Maths Ext.1 Test to Newspaper Lol.
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