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Marazm

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  • Exams
    May 2014
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    Poland

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  1. Hello everyone, I have some problems with my geography IA. The research question of my fieldwork report is: Does the quality of public transport matter on the amount of traffic jams in the downtown of Szczecin? I colected the data by preparing a questionnaire, in which, first of all, I asked people about their sex, age group, place of living, number of people at home. Then I went into frequency of usage of public transportation, their most frequently used mean of transport (private car, bus, tram), assessment of public transport, its pros and cons, proposals of changes (all questions are closed questions with prepared answers). Then I asked about 3 most often travelled lines, Starting and Ending point of the journey, and level of crowding during that journey (descriptive scale from 0 to 9). Last questions were type of ticket possessed and usage of car. My question is: How can I apply various statistical tools for the Written Analysis, Quality and treatment of the collected data? Which statistical tools would be correct? How can I recognize the trends? Firstly I thought about calculation of the mean, for both sexes and for each age group, how the assessment is changing with frequency of usage, how does the level of crowding matter on evaluation or which pros and cons particularly mattered on the mark given. Also I am planning to show which lines are most frequently chosen, and on which lines the level of crowding is the highest. But isn't it too less? Relying only on the mean is too weak for me, however I cannot find anything better. I thought about calculation of standard deviation for the set of marks obtained, but nether do I know how to interpret the outcome, nor how to use in the report. Moreover, the normal distribution function looks quite strange. I thought about probability, e.g. conditional probability or Bayes' Theorem, do you like such an idea? And of course, I am going to evluate the amount of cars in the city by counting them at a particular place in the rush hours.
  2. Chronicle of The Death Foretold! Women! I wrote WA concerning these two things but as it was said I had to narrow it very much. And my conclusion is: it's going to be your misery. WA in "Laguage A: Literature", even "Language A: Literature" in itself is very difficult and strenuous thing. For a scientific mind (like me0 it is a(n) (un)necessary evil. It is even more sad if you know that there is an easier course for studying mother tongue, called "Laguage A: Literature and Language" (check in Lit.&Lang. subforum what's the difference between these two), but such curriculum for your tongue (Polish) hasn't been finished yet! Coming back to your WA - as it was said you have to narrow the topic. Bear in mind that you have only 1,500 words count and you can't exceed it. For example, before writing you can read some works about matriarchy, I strongly encourage you to read "Love, Sexuality and Matriarchy" by Erich Fromm and also "Myth, Religion and Mother Right" by Johann Jakob Bachofen. After reading these two books I noticed some strange facts in the "Chronicle...", which were "uncompromised" before. If you still need help, please PM me.
  3. Hello everyone! I have problem with my Design project in IB Chemistry HL. My research question is: how does the concentration affect the value of experimentally determined enthalpy? I have collected the necessary data, I've created a graph of temperature change versus concentration - it shown the positive linear correlation. After that I have plotted the graph of enthalpy change versus number of moles. As we know, enthalpy is amount of heat changed per mole of a substance. It does not change with the number of moles, it is a constant. Thus, the graph should look in the form y=c, where c=const. Now my question is: How to calculate the uncertainty of that graph? Should I use the equation used in physics that applies for linear graphs: (gradient of f(max)-gradient of f(min)/2? Or should i use sth else? Any ideas? Are we, as the students of IB Chemistry, supposed to calculate the uncertainties of graphs? I've seen a Design Lab Report from chemistry in which the author did not calculate the line of best fit. Neitherless, he got almost maximum points, by the teacher and moderator.
  4. I have a question concerning my lab report. i do not know where shall I indicate that sth is used as a constant, and the value of that constant. Now I am writing a Lab Report concerning determination of power of the kettle. The gradient of my graph is equal to m=P*c^-1*m^-1, where "P" is power, "m" is mass, and "c" is specific heat capacity. "c" is used as a constant in my calculations. It is worth noticing, that I do not need to use that constant in collecting, processing, and presenting the data (table with independent variables with corresponding dependent vars). I use constant only in calculating the gradient and determining power, that is, it takes place in the Conclusion section. So my question is: where shall I put and write the meaning of constant with its value? Thx in advance for help
  5. Oh I have forgotten to add that I will prepare samples with different molar concentrations, but all of them will have the volume of 50 cm^3. Could you elaborate on why things will go wrong if mass of water changes? Comment on temperature change: it should not be a controlled variable as it will change as a result of using sample with different molar concentration.
  6. Hey guys! during the upcoming week I will conduct my Design experiment. We start on tomorrow on Monday. I have chosen topic connected with energetics and enthalpy change. i am investigating one factor that affects the experimentally determined enthalpy - in this case it is concentration of one of reactants. I've sent the Design recipe to my teacher a week ago, today she gave me a feedback in which she suggested slightly changing the title and some sentences. In general, she said I know what to do and how to conduct an experiment. But my biggest problem is with the equation and identifying the variables. as we know the equation for enthalpy change is ΔH=Q/n. I have converted it into ΔH=(cmΔT)/(CV). But what next? I know that my variables are: -independent - molar concentration and number of moles -dependent - enthalpy, temperature change and heat evolved -controlled - specific heat capacity and volume. My question is what would be the gradient? Is mass a dependent or controlled variable?
  7. @sof****, you are now in pre-IB and you take exams in May 2014, while i'm in IB1 and take them in the same year ? O_o. I think you should recheck your exam date Anyway, my set is: Maths HL Chemistry HL Physics HL English B HL Geography SL Polish A1 SL and... if you are really curious about the boundaries of human stamina, this is the set for you Math HL - I heard a theory that getting 100% from exam is not technically possible, you don't have even that much time. Do manage your time well, when you read the qeustion you should already know the technique of obtaining an answer, even know an answer Chemistry HL - my fav subject. Sometimes is hard, generally when you have to explain sth. But then you have chemguide.co.uk which is very useful. My opinion should change after the extension of bondings and learning organic chemistry, as older students from my school say. Physics HL - rather easy, but not as interesting as Chemistry. Opinion may change as in Chemistry English B HL - Heard a theory from a teacher that for Lang B HL is easier than SL, because of additional two hours. there is more time to explain something much more thoroughly. Even considering a fact that you have books on HL... Geography SL - harder than Economics, probably easier than History. Core is quite big... and Field Work Polish A1 SL - Polish examiners are strict... Me and my coleague often think that we went to the wrong classroom: "How about you Marek? I'm asking because for me it is HL..."
  8. In this experiment I am supposed to count the concetration of vitamin C in tested sample. Vitamin C (ascorbic acid) has the formula C6H8O6, and can be oxidized to dehydroascorbic acid C6H6O6, using iodine. Oxidizer comes from potassium iodate and potassium iodide, which react with each other in presence of hydrochloric acid. KIO3 + 5KI +6HCl → 3I2 + 3H2O + 6KCl Iodine reacts with ascorbic acid as shown below: C6H8O6 + I2 → 2HI + C6H6O6 Due to this reaction, formed iodine is immediately reduced to iodide as long there is any ascorbic acid present. When ascorbic acid has ran out, the remaining iodine reacts with starch indicator. In order to make that reaction happen, linear triiodide complex is formed: I2 + I- → I3- The triiodide slips into starch, forming starch-iodine complex which has an intense black-blue colour: 2 I3- + 2C6H10O5 → 2 C6H8O5 +6HI Method: Pipette 5 cm3 of the tested sample into a conical flask and add about 100 cm3 of distilled water, 5 cm3 of 0.6M potassium iodide (KI), 5 cm3 of 1M hydrochloric acid (HCl) and about 1 cm3 of 5% starch indicator solution. Titrate the sample with the 0.002M potassium iodate solution (KIO3). The endpoint of the titration is the first permanent trace of dark blue colour due to the starch-iodine complex. Repeat the titration three times. Now my problem: I have counted, that the whole amount of iodine is 0.001503 moles. I assumed that density of starch is 1g/cm, so the amount of starch in 1 cm3 of 5% starch indicator is 0.05 g. Using proportions I have calculated the amount of triiodide, which was 0.000309 moles. As i know the reaction no. 2, I've also calculated the amount of iodide, that was made from the reaction no. 1 - also 0.000309 moles. Having this data obtained I was able to calculate the concentration of ascorbic acid. now it is 0.54% (not over 3%). It sould be 0.012% Now the problem is: What am I doing wrong? Or the other question: I was using commercial juice, not ascorbic acid dissolved in water, so there were also some other substances present. Could they affect the readings? Please, write if sth is unclear, I will explain it more deeply.
  9. No, no. I agree with the sentence. In fact, the headmistess convinced me that what I've done was a collusion. I like her explanation and I know that every expert in IB will state the same about my act. But anyway thx for an offer.
  10. I was wrong, my chemistry teacher was connoisseur in my case. She said that, yeah, I was unlucky. Because I wanted to help somebody, and this person had unclear intentions. What's more, as I sent him the digital version of lab it may be interpreted as a collusion, despite the facts (written above). A day after she gave an opinion I was posted to the headmaster. She wanted me to clearly describe what happened. After giving my testimony, I asked if it was a collusion. Yeah, it was, again, in spite of the facts. Why? Because while you send your work via internet, you actually get get rid of your copyrights (which is forbidden by the IB). If you send sth to the Internet, it's usually impossible to remove it from the Network. And somebody may use your work in the future, somebody who lives on the other continet, but anticheat system will recognize the plagiarism. But as these lab reports were very first, trial, and they weren't intended to be sent to moderation, IBO would not be introduced to the case. And thus, IB laws weren't used, but school laws. However, in case of plagiarism, student has 1 from the work, lowered grade from bahavior, reprimand from the headmaster in presence of parents, and he writes the work again. In case of collusion, student isn't given a chance to write the work again. Now I get zero points from Lab report. Headmaster said, that this particular law is not fair, because, to some extent it wasn't my fault. And secondly, why the "bad student" (my colleague) has that chance, and "unlucky one" (me) not. The law is going to be changed, and now I have that chance. The IB-coordinator who was present during interrogation said also, that it is difficult to write sth new on the very narrow topic which is Hooke's law, so I should not start writing a lab, because he is going to speak with my physics teacher. Maybe I will be given another task. So actually, it could turn out to be worse. The fact that this was a trial lab helped me very much. However, now my really good Lab Report has turned into a "**** of paper". Of course, I have real chance to write even better lab, which would be again "the first and trial Lab", but may be difficult to gain again 6 points for Design and 5 for Conclusion. However, I have also real chance to gain more than 3 pts for DCP.
  11. Thx for all your replies. After few days i actually know nothing. I wasn't interrogated yet (and I am not sure if I would ever be). My colleague gave me some information: -as the work was not intended to be sent for moderation, the results of such plagiarism are negligible -court of justice is rather going to rely on in-school constitution (there is nothing about drop-out or post in the student's briefcase), not the IB (but I still don't know if the court has been introduced to the case) -I should not worry about myself
  12. My social life is in school and during CAS. On CAS I do sport dance, so I spend not 1 hour a week on Action, but about 5 or sometimes even more (but on CAS I only count one). I don't party hard, because i don't like parties where alcohol is a catalyzer (=without it fun doesn't take place). The second thing is that I like dancing but only strict dancing (that's why I've chosen sport dance). I just don't like "club dancing". So, as you can see, I am not bookworm, I have some free time, which I spend mainly on dancing to prepare for tournaments, and to have fun.
  13. Hello everyone! I will clearly describe my case. There are two people involved: me and my colleague. I attend Physics HL, my colleague attends SL. We are tutored by two different teachers. I was given a task to investigate Hooke' law, and write a Lab Report from that experiment. This was my very first LR. Deadline: two weeks after conduction of research. I wrote a work and gave it to submission. SL group had the same task, but given later. My work was already checked before the deadline of SL. My Lab Report was the best in the group. After "moderation" I started boasting myself: "F*** yeah, 14 on 18 points!". My colleague asked me if I could borrow him my LR, because his deadline was in 1 day, and he didn't knew how particular sections should look like. I proposed him that I would scan my checked LR with adnotations from teacher, so he would not to commit my errors, which would result in better work. He said: "no, no, just send me doc file". I agreed. But after two weeks, he told me that his teacher had doubts if his work was actually made by him. "So, in case of emergency, you helped me". OK, I responded. But on the Physics lesson, my teacher said that a malpractice occured, and people involved should be aware of that. I told, that i helped my mate in preparation of his LR. Teacher responded: "Yeah, ok, you might have helped him. But I'm not sure if you know that he copied your work". Then she showed our works. It was obvious - he copied whole paragraphs, predicted graph in Design was mine. He didn't even change symbols. He committed the same mistake - data was processed using the first value from the table, not from the graph. It was obvious that he commited plagiarism. Later that day, he was sorry, he said it was idiotic, etc. He stated that he will avow every accusation so I will be clear. Yeah, I was sad, angry, it did hurt, but I forgave him. Now let's proceed to the "main body". "School's court of justice" is going to be made up on Monday. I think that I will be interrogated. I want to tell the truth. It's ironic in some way - I often lie to my parents, but I want to be honest during the trial. My question is: Did I commit a collusion or any kind of malpractice? Collusion is permission given by one student to another student to copy his work. I didn't give him any kind of that permission. In fact, he copied my work without my knowledge. So why did I send him my LR? -it was already checked, so it was clear it was mine -it is in the database -I am aware of the existence of anticheat systems - I am registered on www.turnitin.com -I trusted him, that he would use it only as a model Having read first four facts do you any hole, which would provide an incentive to commit plagiarism? In my opinion, it is a perfect system, so I didn't even suspect that he would do such stupid thing. But the question is the same: Am I involved in an act of colussion?
  14. My university requires 2 experimental sciences HL so I had to choose. Chemistry was a must - I love it, because it is really logical science for me. Then I had to distinguish Bio or PhysX, both on HL (I am not a masochist to take all three experimentals). I know I am able to learn Bio well, but it would take a looot of effort to get good grade. And PhysX is a description of the world by mathematical equations (take a look at my Math level, it corresponds to my love towards it). So the verdict was easy to predict.
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