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    May 2010
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  1. Dzeb

    How do you study best for biology?

    The mind map thing sounds to be really helpful. There's no point in memorizing textbook, especially for HL =]
  2. Dzeb

    chemistry ee: buffer solution

    Yeah, that's what I thought. However, hemoglobin is involved in CO2 transportation as well so be careful not to mix or forget anything, j-laurel. And in case you choose to pursue this idea, make sure you know gas exchange topic CORE, AHL and option, even if you do not do biology. And even though giving exact topic ideas is cheating, I do not really think that it is essential. I remember how difficult it was to come up with the topic for EE. It is now much easier when all the topics are covered. If I had the same knowledge that I have now, my EE topic would be different or even in a different subject.
  3. Dzeb

    Economics most recent syllabus

    I graduated a month ago and we used the 2003 syllabus which was still valid. However, during the last year our teacher was saying that the syllabus is about to change. I haven't heard about any changes though. Your teacher or DPC should know better =]
  4. Dzeb

    chemistry ee: buffer solution

    Sandwich, students start to write their EE's in the first year of IB with about half of the syllabus covered only. Some of the topics that are not yet covered can give great ideas so I don't think that giving directions on certain topics is cheating. J-laurel, ff you're doing biology, check gas exchange topic (it might be in AHL part or even in option Further Human Physiology). You will see that blood pH is regulated by CO2, HCO3- and H2CO3. I don't remember exact equations, but these work as a buffer. It might give you an idea. Also, pH indicators work as buffers as well. And they have a certain range in which they work. Refer to the data booklet, this might be another idea.
  5. Dzeb

    Filling in CAS forms

    Actually, I remember that at the end of IB we filled some sort of 'final CAS evaluation' which had IB signs and everything. I suppose that this is the only one that is filled by every student.
  6. Yes. Syllabi are reviewed every 4 or 5 years so you should follow year 2009 =]
  7. Dzeb

    What if

    Yeah, no worries dude. Just make sure you have sufficient hours by the deadline. Maybe CAS coordinator's comment won't be very bright in that case, but it will still be a diploma. BTW, IB wouldn't give you more time to complete CAS. You get rewarded for what you do - if you don't manage to meet the requirements, you don't get rewarded =] pretty simple
  8. Dzeb

    Chemistry Kinetics Lab HELP

    Sorry for repeating myself, but I don't want any of you to do work for nothing. A change in conductivity is instant and you cannot measure the rate of this change. You will be able to measure the change in conductivity with the change in concentration. However, this will give you the degree of dissociation or smth, but not the rate of reaction.
  9. Dzeb

    Medidal School

    Take Maths SL, especially if you are aiming for Cambridge. There are universities that will not accept you with math studies. Maths SL is really manageable, so there's no point to go below.
  10. Since you did not measure the rate of photosynthesis, your data is pretty straighforward. If you put wavelength on x axis and the time taken for leaves to rise, you should get a curve similar to this: http://grow.ars-informatica.ca/images/photosynthesis.jpg
  11. Dzeb

    Chemistry Kinetics Lab HELP

    However, I don't believe that measuring conductivity will give you good results. To see the rate of reaction you would have to measure the rate of change of conductivity. I have tried to do a similar thing with pH but such changes are too quick to be measured. The most precise and used method is to collect gases that are being released. For example, HCl + MgCO3 > MgCL + H2O + CO2 - you can measure the change in CO2 concentration which will give you the rate of reaction. Any method that can measure a change in the concentration of products or reactants will do.
  12. Dzeb

    Chem IA literature value

    I suppose you're using the calorimeter to measure the enthalpy change. You can 'calibrate' your calorimeter. Mix 50ml of hot and 50ml of cold water (measure the temperatures). Then there will be three heat measures: Hot water losing heat Cold water receiving heat Calorimeter receiving heat. The sum of all three must be equal to 0 (1st law of thermodynamics - energy can not disappear nor be created). Thus, you will get the specific heat of the calorimeter. Add it to your calculations and your experiment will be very precise =]
  13. Well, don't forget that conclusion is the summary of all your work. I haven't done this assignment, but type II assignments are very similar in nature. Go through your work and summarize what have you shown or proven. And then, do not forget to analyze all weaknesses and limitations, this is crucial. For example, if you model a function for a given range of data, does your model function work with data out of the given range? The main point of type II assignments is to understand the limitations of mathematics.
  14. Dzeb

    Bio HL Paper 3 (TZ 2)

    Well, I was also expecting the ear or the eye in option E. However, it was rather easy. I am glad that there was only one question that asked to outline a particular example (of rhythmical behaviour) because these are questions that require you to have crammed the book. In option H I was also surprised that there were no (or one, can not recall now) questions about the absorption of food or liver, these make up a huge part of the option. But you can not say that Bohr shift was unexpected. The Gas Exchange topic was really huge and deep and I was pretty sure that there will be questions about it (I was hoping for more). The only thing you have to know about Bohr shift is that pH changes the saturation of hemoglobin, the rest of the question was simply explaining the saturation and how does it affect muscles. I agree that it was very different than some previous papers, but it was reasonable.
  15. Dzeb

    may 2011 exams

    Guys, at least let us finish this year's session... =] However, I can give you all a good advice. Do as much internals as you can this year and do them good. And make sure you do not work during the summer until September. The two months will not save you if you're in trouble but they will definitely boost you for the next year, which is easier than first

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