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Exams

  1. Hi, I started doing my chemistry IA on the effect of temperature on buffering capacity. I added a pH 7 buffer to distilled water and titrated it with NaOH. I then measured the amount of NaOH taken to increase the pH of the water by a unit of 1. I tried this for temperatures between 5 and 80 degrees but there was no significant difference between the data obtained. This there any notable fault in my methodology? I have to finish gathering data for my IA within one week. Since I was going to discuss the effect of temperature on the equilibria of the buffer solution, I am in the p
  2. Hello I'm a new DP 1 student and I started looking for ideas for my EE. I decided to pursue chemistry as my subject and I have a solid topic in mind, but it's not wide enough. I'm going to investigate differents cuts of meat of different ages and I'll compare the values of protein and fats in each. What can I do else? And how can I make this a proper topic? What experiments can I execute? If you're not allowed to help me, just tell me how I can find the experiment needed... Thank you in advance.
  3. Joisshi

    Heating NaCl

    I heated NaCl (table salt) and it turned from white to blackish colored ash-like substance (yeah, great explanation) Why did it happen?
  4. I want an investigation/research that is simple to experiment practically (I don't have fancy equipment. My main piece of equipment is my bike), but also complex enough that I can explore "theoretically" (meaning I can well beyond introductory mechanics principles). Can anybody list some ideas? I know this is an open-minded question, but I just need ideas to get me started because coming up with an idea is excruciatingly difficult. Also, I'm writing my EE in Physics and it's due in less than 2 weeks Thanks.
  5. For my IA i need to test the levels of photosynthesis in plants through chromatography. Does anyone know what chemicals and material I'll need ?????
  6. Hi can anyone please try to give me some ideas for the biology HL IA? I had an idea about compost and taking the temperature of it, but I think it would take too long and require a lot of attention. I also am interested in enzymes. I love biology so much and I really enjoyed the first year of ib and I did well on the tests, but now that I'm starting to look at experiment ideas I feel so stupid and I don't understand them. Might end up dropping out. Oh well! :/
  7. My teacher told me the biology ia has to involve the variables. i.e. the investigation must be about the effect of sth on sth. That doesn't sound right to me. Isn't it supposed to be an exploration related to ANYTHING we've covered in the course? I want to do an identification of lactobacilli in yogurt by DNA profiling. Is it possible that my teacher is mistaken? What about other restrictions on the choice of topic? DNA profiling tech is unavailable in my school lab. Is it ok to use more advanced equipment in outside labs? Or would it be considered beyond our level or even academically d
  8. Guest

    Failed IB experiment

    Long story short, I did a bio extended essay, messed up the experiment, instead of isolated colonies I got a single weird blob. No data collected. Failed the experiment. Am I allowed to use external data to support my arguments?
  9. Hey guys! I am doing my extended essay in physics, and I want to do it on how the speed of a soccer ball affect its projectile motion for this experiment I will have to keep a constant speed while I kick the soccer ball. How do I keep a constant speed? Also, does doing experiments on simulation affect our grades? It would be great if you could help me out. Thanks in advance. P.S. please reply ASAP!
  10. Hello, I have to conduct an experiment for my Biology IA and I was thinking it should be about Caffeine. I am a Caffeine intolerant and I would want to make some experiment of "how to reset caffeine tolerance" and to see if its possible. Perhaps I could measure my heart/ pulse rate for 3-4 days and see if there is any difference. Now I really need to now if this idea would work for the Biology IA and I would really appreciate if any of you could suggest how I should write the research question for this experiment in this case. Now first of all, can I do this if I have human consent fo
  11. I am planning to examine the effectiveness of sunscreen in aquatic biota but I am stuck on how to do the experiment and make it quantifiable. I know that using spectrometer will help this experiment, but I do not know how to test the effectiveness of sunscreen in water condition. If you have some idea, please let me know! Thanks.
  12. Hey guys! In my TOK presentation, I am talking about how science advances and the ethical issues that come with that advancement. What can I state as a claim and counter claim [in terms of ethics and advance], when I talk about certain experiments that were undertaken in psychology to find more about how humans work? Such as the Milgram Experiment, and the blue eyes, brown eyes classroom experiment?
  13. So I'm doing my bio ia on the effect of different concentrations of sulfuric acid on seed germination. It's been nearly 3 weeks and I only have data for the control test (spraying with distilled water), and very few seeds germinated for any of the other concentrations (0.2M, 0.5M, 1M, 2M, 5M). These few seeds that have germinated won't really have any effect when I do the means for the 5 trials of each. Is it ok if I have very little variation in my data? It would be like an average of 14 out of 20 seeds for the control test and then less than 1 for every other increment. Does this reflect bad
  14. Hi! I’m currently doing my IB Chemistry EE with the topic of Anaemia I’m investigating the effects of putting iron objects in food while cooking to see if that raises its iron content. I got the idea from http://www.luckyironfish.com/ a project started a couple of years ago to treat anaemia in Cambodia. I’m having trouble with a research question for this, as I don’t quite know what to focus in on. I thought I’d try to replicate the experiment with just a piece of iron; placing iron nails in a pot of water to see if the iron content would go up, and do my EE as an eval
  15. I can't devise a good procedure for my ee experiment in biology. Research Question: How are the allometric characteristics of radishes (Raphanus raphanistrum subsp. Sativus) affected by different levels of pH? What would be a good design to experiment this idea? I will be measuring root to root ratio, root diameter vs PH, leaf length vs PH, Leaf legnth vs leaf width Please and thank you!!!
  16. So... I am really struggling with my IA experiment. I used a stupid experiment that basically included having test patches with coffee on them, and then I was to pour different percentage concentrations of vinegar on it. I was then going to see how the different concentrations of vinegar would remove the coffee stain, or rather, the effect that it would have on the different stains. I am varying the amount of acetic acid concentration in the videregar by the way. So...problem is that I want to show how the patches "lost their stains", and I need something else than my naked eye to prove t
  17. So I'm doing my EE in Biology and my research question is "To what extent does constant cold acclimation at the temperatures 18˚, 5˚, and 0˚ degrees centigrade affect the seed germination rate and subsequent total biomass yield produced in Phleum pratense L. (Timothy grass)?". The experiment was supposed to investigate the effects of seeds germinated under cold temperatures and the effect on the biomass produced in seeds after germination among different temperatures. I even had some data with around an 80% germination rate for the seeds at 10˚C. But 10 days in, and 100% of the seeds at
  18. Hi everyone My first EE draft is due in 2 weeks and I really need to start on my trials, but I have a few random questions before I start that I haven't been able to find online (that I understand lol) and was hoping someone here might have an idea? My topic is on duckweed and its ability to "remove" heavy metals (or other pollutants, chemicals etc) and maybe how that will affect the growth of another aquatic plant. If you think you might know anything about this, I would really appreciate if you could take some time to read my questions in case you might be able to answer them
  19. Hi! I am planning to do my Bio IA on how do different light intensities affect rate of photosynthesis (of a pondweed, idk specifically what species yet) IV- light intensity. I aim to place the plant away from the lamp in various distances (5, 10, 15, 20, 25 cm) DV- CO2 uptake by plant (measuring pH of water) OR counting bubbles of oxygen produced in/per one minute OR measuring oxygen produced by using a gas stringe 1. Is it necessary to have a lux-meter to measure the lux of the light intensities? Or will just stating the distance of the plant from the lamp be eno
  20. For my IA, I am trying to determine the conductance (ion flow) in different drinks such as distilled water, Gatorade, Powerade, coconut water, orange juice, Pedialyte, and a solution containing sodium chloride. I was planning on doing this by using a digital multimeter and measuring the resistance of the substance and then taking the inverse of it to get the conductance. I would determine whichever substance had the highest conductance and by doing so, would be able to find the substance with the most electrolytes. Growing up playing sports, I have always been told the importance of staying h
  21. Hello, I'm a physics student and I'm writing my EE in physics. My research question is "how does wavelength of light affect the energy output of a photovoltaic cell?" I will be comparing different types of lights such as incandescent light, fluorescent light, sunlight, and LED light. I bought a small 1W solar panel and now I need to find some ways to control the experiment. My biggest concern is controlling the intensity of all light sources. I believe since my independent variables are wavelengths of different types of light, I should keep the intensity same right? For example, I c
  22. I need help figuring out more quantitative date for my Chemistry IA experiment. I am creating fires (most likely grease in order to mimic a cooking fire) and testing the speed that they are extinguished with different masses and particle sizes of sodium bicarbonate. Is there anything else that I could test for while doing my experiment that would lend itself to more quantitative over qualitative data?
  23. I am doing my Biology IA on the effect of using your dominant and non-dominant hand on reaction times as a response to visual stimuli. If any of you has some spare time, could you do a very quick reaction time test, which will take maximum five minutes, to provide me with some more data? All you have to do is visit this website: http://www.humanbenchmark.com/tests/reactiontime You do the test twice, once with your dominant hand and once with your non-dominant hand. Every test consists of five reaction times. Once you do it, could you please post them for each hand for me? This will mean 1
  24. This is my first post ever on IBS, but here it goes: I'm doing my EE in Chemistry, however after discovering that I wouldn't be getting the chemicals for my initial proposal (he initially approved it, but the weekend before our designated week for labs he told me I couldn't do it due to them being too expensive and not useful to the school etc), I'm kinda forced to stick with an idea proposed by my supervisor. Basically it's determining whether there is a difference in the CaCO3 content of eggs laid by free range chickens compared to those laid by battery chickens. I do like the ide
  25. Hi, I really need help. I'm doing my extended essay in the Biology area and I thought the biology extended essay was a research paper with a small experiment to back up the research but turns out, the experiment is the entire essay. So I really need to pick an experiment NOW. My topic is about leaky gut and digestive issues and natural ways to treat it and help the small intestine heal itself. Some experiment topics I was thinking about doing were: The links between food processing and leaky gut disorder (but i feel like this is pretty common) Links between digestive
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