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Exams

Found 1,935 results

  1. Hi there, I'm really struggling with topic 1 stoichiometry and I really need help! Will you please help me with the following 3 questions? 1. 5.0dm3 of 2.00mol dm-3 sodium carbonate solution, Na2CO3 (aq)was added to a volumetric flask and the volume was made up to 500 cm3 with water. What is the concentration in mol dm-3, of the solution? 2. How many grams of sodium azide, are needed to produce 68.1dm3 of N2 (g) at STP? Molar V at STP = 22.7 dm 3 mol-1 ; Mr(NaN3) = 65.0 2NaN3 (s) → 3N2 (g) + 2Na (s) 3. 2.478g of white phosphorous was used to make phosphine according to the equation: P4 +3OH- +3H2O ---- PH3 +3H2PO a) Calculate amount in mol of white phosphorus used b) This phosphorus was reacted with 100.cm3 of 5.00 moldm-3 of aqueous sodium hydroxide. Deduce, showing your working, which was the limiting reagent. c) Determine excess amount in mol of the other reagent d) Determine the volume of phosphine, measured in cm2 at STP that was produced. For #3, I'm stuck after the first a), and I have no clue how to start off with number 1 and 2. Is #1 a question related to titration or concentration? For question 2, do I use the volume of gas law with the volume ratio to solve the question? Thank you, please help me!!
  2. Hi, I am having a lot of trouble when it comes to choosing my real life situatuion. I don´t even know how real the real life situaution has to be. Allow me to explain, my teacher told us that it has to be real, as in it can happen in real life, but that doesn´t mean it IS really happening. The more I try to explain it it gets even more confusing, what I am trying to say is that I don´t know whether the real life situation has to be an example of something that actually exists or if it can be about a situation the could hypothetically happen. Because I want my RLS to be related to memory and how memory changes with time, and how little details start to blur and also how we might be convinced that something actually happened when it never did. But I can´t think of a real life situation and I still don´t know if I can make it up or If I have to use an actual RLS. If anyone could help me I will be eternally grateful to you.
  3. I've been struggling with my chem ia topic - every idea I have turns out to be too hard to pursue with my current knowledge and skills or I just have no idea how to come up with an actual method to measure something. My teacher isn't too helpful either - she isn't too keen to give me any tips or help me develop my ideas into a valid research question. Lately, I've been thinking about investigating how does the presence of different metal ions affect the rate of hydrolysis of esters. Is it a good idea, should I take it seriously and look into it? And what method could I use?
  4. hello everyone. I am trying to choose which subjects to have in a HL. I know that I have to take HL physics, that one is sorted and decided. but i am wondering if I should have math HL. the career counselor of my school tells me that I am capable of doing it, but my credits would decrease as it is a really tough subject and that is the important stuff. but I also know that I might need to have the knowledge for what is thought in math HL. i really do not know whether is better to have a 6-7's on math SL or to take it HL and to have 4-5's but I would know more content. help please. i need togive them in 3 days. if it's helpful, these are the subjects I've chosen English SL French SL Economics HL Physics HL Math HL or SL? Chemistry HL (I was told to chose 4 HL to have a back up plan, one will be dropped afterwards) thank you
  5. Hello, I need help deciding what topics to pursue. The topic I really want to do is how do the different isomers of butanol affect the yield of carboxylic acid in primary alcohol oxidation. I am planning to do some reflux experiments with this. Unfortunately, I thought this topic was well researched but it seems perhaps the mechanism has ok research but not the compound. So I am having research problems, but I can probably generate more theory since I essentially will talk about elements of molecular geometry that affect its oxidation. I have abundant ideas of further research topics for this if I down this route (ex. what if I use phenol or what if its the same formula but different pattern of bonds?). Currently, the research I have may suffice, but I will have to piece the research together (for example I have research talking about butanol as a compound, then combustion data..etc) to develop it to be adequate. The other topic I feel uncomfortable with, but A LOT of research is written about it. It involves seeing the efficiency of hydrogen production when using a strong base or strong acid. If I go down this route, I will be conducting experiments of electrolysis. I have found abundant research for base electrolytes, but it feels kind of answered and I just have a faint idea of how I am going to discuss this in theory. I would love to hear your opinions and thanks too!
  6. Hi, I was just wondering if anyone has good structures of writing paragraphs for both HL English papers?
  7. mylaaah19

    ESS IA

    Hello, I have a question. What counts and what doesn't count in the word count for ESS IA? I know that the maximum word count is 2250
  8. Hi everyone, So, I am a junior currently taking IB music SL. My situation is unique because I am the only person taking this course, and mostly am doing Independant study during my school's orchestra period. So I have no proper instruction or resources beside my old, outdated, textbooks. Besides my background in music and frequent practice on my instruments, i want more ways to practice and prepare for my exam at the end of the year. Any online resources or tips or anything that I can use to apply my knowledge would be helpful! Thank you for any responses in advance!
  9. Guysss!!! I am a DP1 student and took SSST Serbian as a subject. The problem is that nobody in my school has a slight idea how everything should work, therefore no idea whether my booklist is okay or not(by the IB recommended list it is). But I have no idea how anything should work and if you are/were or know anyone that did it. Pls pls pls answer. #ibstruggles
  10. Psychology IA Statistics Help (Tversky and Kahneman 1974) I chose to do my IA on the Tversky and Kahneman 1974 experiment on the anchoring bias. Basically, it was an independent samples design. In condition A, the participants were asked to estimate a numerical expression in ascending order 1 X 2 x 3 x 4 x 5 x 6 x 7 x 8. In condition B, it was presented in descending order 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1. I already ran the experiment, but my problem is with getting the statistics. As it is independent measures, my teacher said to use the Mann-Whitney test. However, when I input my data, I get this notification: The sum of ranks for samples A and B combined does not equal [n(n+1)]/2. Please check your data entries. Do you have any suggestions for what to do? What test to use instead?? Or do I stick with the test and create ranges (that's what my teacher suggested)? Any help is appreciated. If you want to see the original experiment https://msu.edu/~ema/803/Ch11-JDM/2/TverskyKahneman73.pdf (Study 6: Extrapolation) *Btw the actual value was 40,320
  11. My IA for macroeconomics is about inflation but the solution that the article states is redenomination, which is not in the topic of economics. Is it alright if I evaluate redenomination in a macroeconomics IA?
  12. Hey, I am desperately in need of help on how I should write up the report for my biology IA. I did "How does the PH of the provided plant nutrition affect the germination of pea seeds?" Any ideas on how I should write it up?
  13. Gia

    Math IA

    I have decided to have my Math IA revolve around the probability behind the prisoner's dilemma. I need help deciding on three simple maths and one sophisticated math to explain the game (besides a tree diagram and expected prison sentences). I am afraid that I won't have much numbers/math to work with. Thank you in advance.
  14. Hey! I was wondering if anyone has the Prescribed List of Authors (PLA) and the Prescribed List of Translations (PLT) for English A: Language and Literature? Our English teacher left the school very suddenly, and we currently have no English teacher to turn to for any resources as of yet (I'm in DP 2)! I was hoping to get a head start on figuring out the subject myself, and it would be very helpful if I could get these two documents. I've been trying to find them online, but I can't seem to locate the files. Also, if you have any tips to learning English A: Lang & Lit, or just general tips for the IOC, FOA, Written Task or tests in general they will be more than appreciated!
  15. Hello, I am about to begin my IB next week and I Just wanted to know. I make art youtube videos, which means my face is not in the video. I know that Youtube videos counts as cas and I make the art videos, to teach people how I do my arts. But will it count as cas even though gave around 5 views only? And will they accept it even though I don't put my face in it? The type of video my make:
  16. I am going into my first year of IB. I had planned to take exercise science and art, but my school just let me know that this is not available. I must choose either bio and art, or psychology and exercise science. (We are on A day B day schedule so I must choose one of theses pairings) Which of these pairs has a higher course load? And which is harder content in general? Also, if there are any opinions not based on these questions I most definitely want to know that too! I am interested in all of these classes pretty equally, and just making sure I choose a pairing that will not be completely overwhelming. Thank you!!
  17. I moved to Psychology HL from Mathematics HL at the start of grade 12, and right now I have to catch up one year of Psychology HL, which the topics cover biological approach, cognitive approach, and sociocultural approach. I can self-study myself but I really don't get how we do the exams.. Do I really have to study everything? Or is there an efficient method of studying these topics? Like I heard something about the Learning Outcomes that can help with the exam questions, but I really don't understand it. Can someone please explain? Thank you!
  18. Hello everyone, I need help to chose a question for my HL History IA. I was thinking about doing the battle of la Drang for the topic. It would go something like to what extent was the battle of la Drang a victory for US forces? Is this a good question? If you have ideas on how to improve the question I'm all ears Thank you for your help
  19. Hello! I'm doing my extended essay on plant growth, but I only have 3 trials from my experimenting. I was told that theres hardly any statistical analysis that i can do without more than 5 trials, aside from calculating the mean, and I have no idea where to go with my data. I was planning on a lab based EE from primary data, but I'm not sure if thats possible anymore seeing as I dont have enough trials for in depth statistical analysis. Should I run more trials, or should I change direction with my EE and use my primary data to support secondary data, turning it into a research based essay instead of experimental?? Please help!! - Thanks, Cherry
  20. Want to share the title of your extended essay? Or perhaps need help choosing one? This is the place. Psychology - The Psychology of Road Rage: A discussion of psychological explanations of road rage and policy implications.
  21. Hello, My name is Taha, I'm 17 years old, and currently in 12th grade. I'm looking for someone to help me with my Extended Essay. I've decided to focus my essay on quantum locking: including superconductors (YBCO), the Meissner Effect. I have access to the materials needed to experiment with this topic (materials from quantumlevitation.com). Some ideas I had in mind was to discuss the Meissner Effect in superconductors when cooled down to a critical temperature with liquid nitrogen. I was inspired to this topic when watching a talk on TED.com about quantum locking and quantum levitation (video here: https://www.youtube.com/watch?v=PXHczjOg06w) This aim of this project is to study the properties of quantum levitation and locking and provide ways to improve the efficiency and speed of current transportation systems (high-speed trains, levitating cars, and hoverboards), and the idea of creating bearings with negligible friction. I will need help in formulating a research question that would be appropriate to the Extended Essay guidelines and know what is the best structure for my essay. Let me know if you can help me. Thanks,
  22. Hello All, As you know by the title, I need EE help. Basically, I chose to do a biology EE cause it is my passion. At the beginning of our topic selection, I met with my advisor and told her that I wanted to do something with E.coli. Over the next several meetings I had with her, I decided upon studying how the different pH's of different foods inhibit E.coli growth. Long story short, on the LAST day of school my advisor tells me that I can no longer choose a topic that has to do with bacteria or else I will not score well. Apparently, IBO changed their guidelines that effected my class and when I asked my advisor about it she said: "yea, they can do that and we have to oblige". So I took about 1 day or so thinking about another topic I could do and landed on studying how different elements such as Nitrogen, Potassium, and Phosphorus inhibit the growth of a lima bean plant. So I got my materials and everything I needed to conduct my experiment and for the life of me, I have not been able to grow any seeds. All of the seeds which I have tried germinating or planting have died/failed/rot. That was 2 months ago. I have kept trying since then but to no avail. My rough draft of the EE is due on the first day of school 8/12/2019 and I do not know what to do. I have emailed my advisor multiple times and each time she has told me to either change my watering habits (which I have, I water once a day, and keep them in the sunniest part of my patio so they get the most sun), or to restart my seeds, or even keep trying. She even said she is baffled as to how I have not been able to grow such an easy plant. And now I am on the brink of a total mental breakdown and do not know what to do. My advisor told me I need some sort of data represented in my EE and if I have none, it will not be good. Can someone explain to me what would happen if my experiment for my EE does not go well? I would really appreciate it. Furthermore, I am in Florida, and all of the gardening departments of every store and independent gardening markets have stopped selling seeds as the season is coming to a close, which is making me even more frustrated now that I have no way of obtaining seeds. Someone, please help. Thank You.
  23. Hello, all who have clicked on this post I would like to simply ask you one question about my ee, specifically whether you guys think its tooo simple or not. So, for my extended essay, I've chosen to do physics (o god), and the sub-topic of astrophysics (double o god), I have come up with an idea for my ee, which is Investigating how the Luminosity, Mass and Surface Temperature of Main Sequence stars are interconnected. Is this too simple for an ee, or do you guys believe it has the potential to be a good if not decent ee? Oh, and the essay will be a database EE, (creating an experiment, and fitting data to come with some conclusion) (I won't go over the specifics such as research question and experiment that I will do since I fear plagiarism.) As a side note I do want to study astrophysics in university, I know that writing an astrophysics ee in ib is suicidal, but I wanna do it because i believe its a good challenge. So taking all that into consideration, what do you all think? Thank you, - a stranger of the internet
  24. My exams are next year and I'm looking at Universities. I currently study: FRENCH B HL ENGLISH LANG AND LIT HL ECONOMICS HL NATURE OF SCIENCE SL MATHS STUDIES SL GERMAN SL I want to study French at university and am thinking about going to study in France. However, I am not sure if I would be taught in English as an International student or taught in French with other natives... I also want to study German alongside the french; does anyone know any good universities to study two languages in France???? This summer, I also would like to go visit some universities there in France, would they allow me to look around or would I need to wait for an Open Day?
  25. Hey, im new here and I need some help. I asked my supervisor for it but... let's say he wasn't in the mood for that, I want to begin my EE but I'm not sure if my topic fits in the categories of the guide. Please, any recommendations, criticism or approvals are welcomed. The research question is " How far the jew idiosincrasy is reflected on the language used in the graphic novel Maus". I think this fits in category 2 but please help, i'm very lost :'c
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