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Exams

Found 88 results

  1. ibsurvivingnew

    Biology IA

    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 ?????
  2. This lab has been submitted and graded by IBO. It received a perfect score in all categories. Research Question: How does changing the angle of incidence of light affect the power output of a solar panel? Includes calculations, graphs, steps to linearize data, and a conclusion to an inconclusive lab. Good example for when you don't get your predicted results from the lab.
  3. Hi! I am writing my EE in biology and I would really appreciate getting some advice from people who have done it in the past. What was hard for you in the process? How did you solve it? Is there anything that you think would have been helpfull to know earlier in the process? General advice and so on would be really helpfull for me both regarding the writing of the essay and the lab. Thank you
  4. Guest

    Empirical formula lab

    When processing data, which values should I calculate the average from? Masses or moles of Mg and O, or ratio? Help!!
  5. Jennita

    Chemistry IA Help!!

    hey, so I recently started brainstorming on what I can do for my chemistry IA. I am doing HL chemistry and I am going into the final year of IB. I have somewhat of a basis on what I want to do. I want to do titration, having the acid be hydrochloric acid and using various basic solutions. For the basic solutions, I want to create solutions from some antacids and compare how each antacid works by seeing how much of each is needed for the pH of the acid to reach and maintain a neutral pH. I'm not sure if this is going to work because this idea is still in the works. Any ideas or tips on how I can improve??
  6. cassandra8462

    Hess's Law Lab limitations???

    Hey guys, I'm doing a lab in my SL Chemistry class called the Heat of Reaction/ Hess's Law lab. Basically we used a polystyrene cup as our calorimeter, and performed three reactions. Calculations were made to determine molar enthalpy. The target reaction was reaction 3 (-54.3 kJ/mol) , and reaction 1 and 2 were used to calculate the molar enthalpy of the target reaction (-50.8 kJ/mol). We then compared the values. What are some limitations of this lab? I'm really stuck. Thanks in advance! (below I have posted the entire procedure) Pour 200 mL of water into a polystyrene cup and record the temperature. Measure out 4 grams of sodium hydroxide pellets and record the mass. Pour the sodium hydroxide into the water and stir until dissolved. Record the temperature of the solution. Discard. Pour 200 mL of 0.50M hydrogen chloride solution into a polystyrene cup and record the temperature. Measure out 4 grams of sodium hydroxide pellets and record the mass. Pour the sodium hydroxide into the hydrogen chloride and stir until dissolved. Record the temperature of the solution. Discard. Measure 100 mL of 1.0M hydrogen chloride solution into a polystyrene cup. Measure 100 mL of 1.0M sodium hydroxide solution into a 250 mL beaker. Record the temperature of both solutions. Pour the sodium hydroxide into the hydrogen chloride. Record the temperature of the solution. Discard.
  7. Hello, My individual investigation for biology is due next week. My topic was quickly approved by my teacher, but I missed the optional draft due date due to the fact that I was having trouble processing my data. My lab is about exercise physiology, and more specifically, the effect of resting time during running on muscle fatigue, meausred by how long it took test subjects to run a lap around a track after resting for different amounts of times between trials. When researching my topic, I found that a lot of what I was testing was outside of the basic ATP cellular respiration taught in IB bio SL. In my lab background info, I talk about ATP creation in muscles, which has to do with creatine phosphate, etc. So after all that rambling my question is, is this okay?? I'm freaking out cause my teacher has not even seen my report and will not look at it until its handed in because I missed the optional draft due date If anyone would also be willing to look at my lab, that'd also be great Thanks!
  8. I did a practical on radial hydraulic jumps and I need to explain the theory behind it. I know how to calculate the pressure using pressure=phg formula but I don't know how to relate the water pressure and the velocity of water. I searched for some equations but they are way to complicated and I don't understand which one to use since they seem irrelevant to my situation. Could you please tell me an equation that simply relates the water pressure and its velocity? Also mention what each variable in the equation refers to. Thanks
  9. crycry

    Experiment on Solar Panels

    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 can't have one tiny LED light and 1 240V incandescent light because they produce different amount of light that will be used by the solar panel. Is there a way I could figure out the intensity of each light? Or is the intensity irrelevant in my experiment? I have no idea. I would greatly appreciate if you can give me some advise as to what I could try. Thank you
  10. Vicky Palami

    Biology IA topic question

    Hey guys, so a few weeks ago I came up with the topic for my Biology SL IA: "the effect of salinity on the amount of oxygen produced by photosynthesis of elodea", but I don't know if it is an acceptable topic, given that one of the prescribed labs was about photosynthesis. In it, we didn't use salinity as a factor, only light and CO2, but I'm not sure if I should do something that is not related to photosynthesis at all, or if my topic is alright given that we didn't try that factor in the prescribed lab. Also, spanish is my first language so I'm writing my IA in spanish, but while looking for information in english I found two prezis from 5 or 6 years ago by IB students that made a very similar experiment, so I'm scared that the IB moderators will think that I plagiarized those people (the prezis only had the data and not the complete lab report so maybe I'm good to go but I would like to hear someone else's opinion). Thank you.
  11. IBdoingnothing

    Error bars IA

    hey guys, so apparently my data consists of both, the x and y uncertainties, and this is becoming a problem as my MS word only has the y error bar. The type of graph I need to make is the line graph. Anyone knows a good app for displaying both error bars, or to overcome this Y only error bar problem of MS word? Worst case scenario, am I allowed to draw the graph on paper and scan it for my IA?
  12. poweroverwhelming

    Lab Help Needed

    Hi everyone, So I'm doing a lab on the mass relationships between the reaction: 2AL(s) + 3CuCl2 * 2H2O (aq) ---> 3Cu(s) + 2AlCl3(aq) + 2H2O(g) Basically, I found my raw data, which is the mass of beakers with the CuCl2 * 2H2O solution, as well as the beaker mass, and the beaker mass with the solid Copper inside after the reaction has taken place. Now the aim of the lab is to pretty much find the percentage yield however, in my IB Chem HL Guidelines that my school provides, I'm told to create a graph of the processed data. No idea what to show though. I've converted all my masses to moles, so I've got that, but what can I really show on a graph with regards to percentage yield? I can't just copy-paste my data into the graph because I'll have to refer to it in my conclusion so I have to actually come up with something. I've searched all over the internet and I've yet to find anything remotely helpful so I'd really appreciate it if someone did. Cheers.
  13. Please help me. I really like this subject but my teacher don't explain me how to do a lab.
  14. Hey, I am doing a lab on the effects of temperature on the enzymatic affects of Catalase, and I am trying to find a way to analyze my data. I have means of the reaction rate for each of the temperatures (10, 20, 30, 40 ,50), but I am confused on how create some analysis on them. If you could give me some tips that would be great!
  15. IBdubai

    Chemistry IA help

    Hello there, I just wanted to ask if my IA idea is ok and if I'm good to do the experiment. My teacher doesn't know the approval process and doesnt know what to approve and what to decline. My topic is: Measuring the Amount of Acid in Vinegar by Titration with an Indicator Solution. And any other information you think would be helpful is also appreciated Thank you in advance
  16. Hi IB Survivors! I need feedback on my IA RQ: "What is the physical workout influence on respiratory system?" . Is it appropirate and can I go with it? I wanted to measure how different intenses influence amount of breath in's , and different kind of sports. Looking for feedback Take Care
  17. I'm doing a lab and I'm a bit confused by the significant digits in the final processed data. For example, suppose I was determining the heat lost by a system and the data in the first trial was: ​ m: 0.500 kg c: any constant, let's say 0.800 temp. initial: 25.0 temp. final: 21.0​​ ​​ Q = (0.500) * (0.800) * (25.0-21.0) Q = (0.500) * (0.800) * (4.0) Q = 1.6 ​​ My final answer has 2 significant figures according to the calculation shown above but, my raw data all had 3 significant figures. I've heard people say that keep the same amount of significant figures as the raw data. So what would I do in this case?​
  18. Recently my chemistry teacher pulled up a grade sheet and wrote down the grades of our labs that we did since DP1. My grades were usually a 2 or 3 from the beginning because she was strict. She even marked us for plagiarism once because we were expected to look for online sources to write a good introduction. Seriously, a lab of thousand over words every single time and she gives us a regular 3, she rarely thinks that it deserves a 5 so it can be overwhelmingly stressful. I always kept in mind with my chemistry teacher's comments and applied to my biology lab report I could easily get a 5 or sometimes a 7. Well she did say that if she's strict we can do better. I understand... I'm just worried if the IB takes my overall lab results from my class and this will just pull down my grades for my overall exam. I forgot how the lab results affect my overall results so it would be great if I got a note about this. :/
  19. xxxxxchxx

    can someone help me

    can someone help me to fill up a quick survey for my biology ia please it is only 6 short questions<3 thxxxxxx https://www.surveymonkey.com/r/WSFX83D
  20. Does anyone have any suggestions on interesting lab ideas for a biology IA? (Preferably nothing having to do with insects or nutrition)
  21. Hi all, I am wondering if anyone has a fool-proof formula for writing a lab report hypothesis? I have seen different opinions from everywhere, but I am trying to create a detailed and proper hypothesis, that follows whatever the correct format is. thanks!
  22. Don't remember the exact grades achieved on this lab, however they were all almost full marks.
  23. So we have a lab on the heat of neutralization of NaOH and HCl given: mass of NaOH = 48.01 g Volume of NaOH = 1000.00 mL Amount of HCl = 83.3 mL of 12.0 M of HCl in 1000.00 mL solution And we found the initial temperature, final temperature Temp initial = 21.5 degrees C Temp final = 25.0 degrees C And we have to find the heat of neutralization using this equation: ΔHθneutralization = (-specific heat capacity of liquid water x mass (acid solution + base solution) x change in temp) / mole of limiting base or acid And I should be getting an enthalpy of around -58 -ish but I'm wayyy off. Help please!! P.S. I'm not that great at writing chem labs... :/
  24. Why does the dissociation constant change with temperature?
  25. Tests the effect of adding NH4Cl (a salt) to various liquids, such as distilled water and acetic acid, on the temperature change of these liquids. This is a full lab report including an objective, variables table, hypothesis, materials, procedures, qualitative and quantitative data, sample calculations, graph, conclusion, further investigation topics, and works cited. The lab was written for a 10th grade (year 11) Pre-IB chemistry course and received a 97%. The course was taught by the same teacher that teaches IB Chemistry SL and HL 1.
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