Jump to content


  • Content count

  • Joined

  • Last visited

Community Reputation

5 Recognised


Profile Information

  • Gender
  • Exams
    May 2016
  • Country

Recent Profile Visitors

1,644 profile views
  1. It depends on the subject. I sent in ToK for remarking yesterday and got the result today! I also sent chemistry and bio, haven't heard anything yet. My IB coordinator told me maximum 1 week. There isn't a set date when remarked grades are released, it all depends on the subject and the time you enquire upon your results.
  2. Hi, I am little confused about the topic of recombinations. Does it only occur between linked genes? If so, does that mean that recombinants can only form between crosses of linked genes? This is what I believed but then I saw a couple of videos that confused me. For example, if we have PpGg crossing with ppgg (unlinked genes) PG Pg pG pg pg PpGg Ppgg ppGg ppgg According to the videos I have seen, Ppgg and ppGg are recombinants since none of the parents have these genotypes. But why? Has any crossing over occurred here? Grateful for help!
  3. Hi, For my English written task, I wrote a review on a play. I pretended to be a writer from a newspaper during the release of the play (1500) and hence wrote it in older English. Now, another friend in another class (he is HL, I am SL) also wrote a review in older English but on a completely different play. We have not collaborated at all (we were just inspired by each others ideas) and our texts are completely different. This does not count as malpractice or anything, right? For example, we have certain students in our math class that are doing an IA on the same topic (which is allowed according to IBO) and some students in our economics class have IA's on same articles. Grateful for answers,
  4. What I did was add a specific mass of ascorbic acid powder to 500 ml of water. I calculated the concentration by finding the amount of moles of ascorbic acid and dividing by 0.5 dm^3. And this was my theoretical concentration. I then calculated the experimental and this was less. This has nothing to do with dissociation, right?
  5. I have read a lot that Vitamin C is very soluble in water. But how is that possible if it is a weak acid? Shouldn't it only partially dissociate in water? The thing is, I carried out a titration to determine concentration of Vitamin C. Theoretical value was 0.06 moldm^-3 while my experimental was 0.05. Could an error be that ascorbic acid does not fully dissociate into water?
  6. Hi, For my ToK essay I intend on using game theory as an example when discussing human sciences (economics) as one of my AoK. My question is, do you guys think this works or os game theory more mathematics?
  7. Hi, I chose title number 4: ’Without application in the world, the value of knowledge is greatly diminished.’’ Consider this claim with respect to two areas of knowledge.'' I am writing about how knowledge can have an intellectual or cultural value, and that the value of knowledge does not diminish without a practical application. One of my examples is the discovery of the Higgs boson. Till now, this discovery has not put to a practical use, but it was still so appreciated that it was awarded the nobel prize. Now, my biggest concern is counterclaims. I feel I have a lot of examples to bring up, but no counterclaims. How would you guys recommend coming up with counterclaims. What could for example a counterclaim to my comment that the discovery of the higgs particle satisfy an intellectual value be?
  8. I reckon you found that article from the IB economist (had a bunch of classmates writing about that). My advice is not to choose any article from there. Better if you look for your own. I would recommend searching for articles regarding the situation in China. You should find a plethora of them discussing the implementation of monetary/fiscal policy in the country.
  9. Yeah it should decrease and it does that from 40 degrees onwards, with a rapid decrease occuring between 60 and 80 degrees. You are right, might be an anomalous result. Problem is, our school will not give us any other opportunity to conduct the experiment. Thanks for you help! Oh dear, that's an issue. Are they only allowing you to do it during class time? Maybe you can ask your teacher/lab technicians to give you permission to do it after school or something? Yes, I will do that
  10. Yeah it should decrease and it does that from 40 degrees onwards, with a rapid decrease occuring between 60 and 80 degrees. You are right, might be an anomalous result. Problem is, our school will not give us any other opportunity to conduct the experiment. Thanks for you help!
  11. Hi, I am so sorry. I will not bother you anymore but I just have this one last question (and please anyone else that sees this post: help if you can). So I did my experiment today using vitamin C dissolved in distilled water. I heated the solution to 20, 30, 40, 50, 60, 70 and 80 degrees for the same amount of time (5 minutes) and then calculated concentration of Vitamin C through titration with iodate ions. The thing is that concentration of vitamin C increased from 20 to 40 degrees but then started decreasing. Does that make sense? Why does it increase in the beginning? Regards
  12. Hi, I am currently taking Physics Sl as my seventh subject (I have Chem and Bio Hl in my diploma). Thing is that I regret not taking physics hl and including it in my diploma as it's the subject that I mostly enjoy (I have a 7 in it). I really want to study chemistry and physics in uni in the US. Is that possible with having studied physics sl?
  13. Hi, I am mixing HCl (of known conc), KI (of known conc), distilled water, starch solution and distilled water with ascorbic acid dissolved, in a conical flask. I am then titrating this with a known conc of potassium iodate to determine the concentration of ascorbic acid in the distilled water. I am doing this with different temperatures of dissolved ascorbic acid in distilled water. I should have following reaction: 2 IO3- + 10 I- + 12 H+ --> 6 I2 + 6 H2O when iodate ions react with iodide ions during titration. My question is, am I write when thinking that the amounts of mol of I2 produced is 3*xy, where x is the concentration of iodate ions and y the volume of iodate ions added? When I2 then reacts with ascorbic acid, following equation should be established: C6H8O6 + I2 --> C6H6O6 + 2 I- + 2 H+ Once again, am I write when thinking that the concentration of ascorbic acid can be calculated by dividing 3*xy by 6 (i.e. 1/2*xy)? I just want to be sure that I am doing the right calculations when determining the concentration of ascorbic acid. Grateful for replies
  14. You don't really need e research question for the math exploration. It is not a research paper.
  15. Hi again! When I heat the lemon juice, do I need to control the temperature while doing the titration? My teacher said no as ''once you heat the juice, the vitamin C has been affected and that's enough''. Is this true? Does the same hold if I want to cool it to 5 degrees? Btw, I saw that you have, on an earlier post, written that ''Also, keep in mind that Kw changes with temperature to pH changes will not yield significant results.'' What do you mean by this? Think of vit. C like a sponge for oxygen and other oxidizing agents like iodine. The warmer you make it, the more likely it is to react irreversibly with either oxygen or iodine because the reactants will have more energy (remember the postulates of collision theory). Since oxygen is the stronger oxidizing agent, vit. C will likely react with oxygen instead of iodine. Then again, this effect may be insignificant because oxygen is not very soluble in water, especially at higher temperatures. The change in Kw with temperature: The more internal energy the solution has, the more water molecules will self ionize. This means that as the temperature increases, a neutral solution will have higher proton concentration and thus, lower pH. Only at 298 K will a neutral solution have pH 7. Since more and more protons are released into solution at higher temperatures, this may have an effect on the ionization of vit. C, which is a weak acid. Look into the common ion effect if you'd like to read more Hi again, I did the experiment today and it was a total disaster. I kept getting different results for same temperatures, and it was also hard to control temperature when heating. I thought that I, instead, will look at effect of storage at different temperatures under a period of two weeks. Do you think that would work? My teacher is really not helpful at all. Can I determine concentration of Vitamin C by using Beer Lamberts law?