Chemistry
For Chemistry Discussions
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My teacher told me that an IB study guide would be very helpful going through Chemistry and I started looking online for a book. But, when I look on Half.com, there are two books for IB Chemistry, a course companion made in 2010, and a study guide made in 2007. I was wondering which is the better one to get in order to study for the IB exam and assist with explaining concepts. I am not sure what the differences are between the course companion and the study guide, so I need to know which one is better to buy. If it helps, I'm taking SL Chemistry and the teacher is very good but there are a few topics where I need to refresh on from Chemistry I (Sophomore Year).
Last reply by kirann, -
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This thread could be used for the new syllabus IA from 2016 onwards. Please note that I cannot help individual students with their IA. The choice of topic should be your own work so please do not ask for suggestions for your IA. The following information is taken from the May 2015 subject report (I'm sure it is copyrighted to the IB, but I see no harm in sharing it with IB students). Research question: Encourage students to choose a research question that has a degree of challenge, is of interest to them and one where they do not know at the outset what the outcome will be.A good research question will probably try to determine a trend or relationship. Students shou…
Last reply by IBsciencewhiz, -
Hey people, I've been away for a while. The good thing is that I'm back and I'm willing to help any Chemistry student with their problems or doubts. I'll be glad to help you with questions regarding lab reports, designs, theory or even on how to approach the actual paper. I hope to be useful. Thanks in advance. Regards
Last reply by IBchemistry, -
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Here are the links to my website and YouTube channel. I have a full range of videos for both SL and HL topics including options A, B, C and D. Website: http://www.msjchem.com/ YouTube channel: https://www.youtube.com/user/mikesugiyamajones Option A: Option B: Option C:
Last reply by Tragic Survival Chances, -
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With the first exams for the new syllabus coming in May 2016, you could ask questions and post resources for the option topics here. For option B, I have a complete set of videos for SL and HL. I will be working on videos for option C next. Option B SL: http://www.msjchem.com/sl-option-b.html Option B HL: http://www.msjchem.com/hl-option-b.html Option C SL (almost finished SL, now working on HL) http://www.msjchem.com/sl-option-c.html Option C HL http://www.msjchem.com/hl-option-c.html
Last reply by IB`NOT`ez, -
Anyways.. What are your option material? I'm hopefully taking option B (Medicines and Drugs) and C (Human Biochemistry) alone. Anyone ever done both/one of them? What are yours and what do you think of them?!
Last reply by Award Winning Boss, -
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Hey im just going over some past papers and I just have a few questions I can't answer... Ill just post them here and if someone could help itd be awesome. 2. Which sample has the greatest mass? A. 6.02 x 10^23 molecules of hydrogen B. 5.0 mol of neon atoms C. 1.2 x 10^24 atoms of silver D. 1.7 x 10^2 g of iron 4. Which sample of nitrogen gas, N2, contains the greatest number of nitrogen molecules? A. 1.4 g N2 B. 1.4 dm^3 of N2 at 1.01 x 10^5 Pa and 273 K C. 1.4 x 10^23 N2 molecules D. 1.4 mol N2 My teacher didn't give me a markscheme so im trying to make one...
Last reply by harmless, -
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The answer is "reducing agent." So here's what I have so far: ClO3- --> ClO2 ClO3: Cl +5; O -2 ClO2: Cl +4; O -2 I understand Cl is being reduced and nothing is being oxidized. My teacher taught me that if something is being reduced than you need an oxidizing agent? So my brain is telling me that since I have something being reduced, I would need an oxidizing agent. Why is it reducing agent? (I really hate redox
Last reply by EmmaJR, -
Hi. My daughter used to be in an IB school up to gr 9. She chose commerce stream at gr 9, which means she didn't learn Chemistry from gr 9. She moved to a local school (non IB school) in gr 10, and learn Chemistry here, which covers: - atomic structure - atomic theory - quantum mechanics - electron configuration - periodic table - chemical equation (balancing the equation) - compound naming convention - Chemistry Basic Law (Lavoisier, Proust, Dalton, GAy Lussac, and Avogadro Law) - Relative atomic mass She is intending to pursue pharmaceutical science. I have checked that some of the universities that we intend to go…
Last reply by Jennysput, -
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I am doing my chemistry ia about investigate how the different amounts of salt added to a solution alter the mpemba effect concept and this is my research question "How does changing the salinity of water (0%,5%,10%,15%,20%) by adding different masses of NaCl, affect the Mpemba effect, measured by the rate of temperature change of hot and cold water, respectively?" Can you suggest relevant random errors and systematic errors because I can't think of any ?
Last reply by Janahoss006, -
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5 dm3 of carbon monoxide, CO(g), and 2 dm3 of oxygen, O2(g), at the same temperature and pressure are mixed together. Assuming complete reaction according to the equation given, what is the maximum volume of carbon dioxide, CO2(g), in dm3, that can be formed? 2CO(g) + O2(g) → 2CO2(g) The answer is 4, but I don't know how to get there, can someone please explain this. Am I supposed to change the dm3 to moles?
Last reply by IB_taking_over, -
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Hello, I was having a few questions about my chemistry database IA. I am investigating the effect of halogenation on boiling point in alkanes. My research questions are as follows: As the carbon chain length increases the boiling point increases. How does halogenation affect the boiling point and the factors that contribute to boiling point. Which of the factors mentioned above are most affected by changing the halogen attached to the alkane I drew up graphs of surface area vs boiling point, molar mass vs boiling point and polarizability vs boiling point for alkanes, fluoroalkanes, chloroalkanes and bromoalkanes all the way …
Last reply by AnnaHoffman, -
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"An unknown compound, X, of molecular formula C4H8O2, has the following IR, H NMR and MS spectra. Deduce the structure of X using the information given and any other additional information from sections 26–28 of the data booklet. For each spectrum, assign as much spectroscopic information as possible, based on the structure of X." About this question. I'm easily able to find things like the IHD and the wavelengths given in the spectrum that's presented. I found out there is a carbonyl group and a C - H bond. I was wondering if someone knew how to deduce relative integration numbers either from this question or from a H NMR spectrum. I can see that there are …
Last reply by xAnnixx, -
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"Compound Y is a hydrocarbon and has a molar mass of 86.20 g mol–1. Upon combustion, Y produces 1.75 g CO and 0.836 g H2O. Deduce the molecular formula for Y." This is a question I tried solving yesterday, related to Stoichiometry. It's simple enough and I understand the general way to solve this. After calculating both n(C) and n(H), I tried calculating n(C)/n(H). My problem is that this resulted in something like this: 0.0398/0.0928 = 199/464 (=0.4288...) The solutions that are available to me say it's more like 3/7. Now, my question is probably more related to math and calculators than chemistry itself. I can't seem to get this approximation of 3/7 wi…
Last reply by xAnnixx, -
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I am trying to figure out how much I need to expand some of the sections, and i was wondering if the works cited and title page count.
Last reply by AlexSails, -
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I constantly see diagrams showing molecules in a 2d plane but using 3d markers like the dotted lines, the wedge, etc. Should I know this for the exam? Or are the Lewis structures enough?
Last reply by Carlito_21, -
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I am currently in the experimental stage of my chemistry IA (sl) and it is a redox titration where the indicator is KMnO4 (0.01 M), the acid H2SO4 (1 M), and my independent variable is different boiling times of spinach. I am trying to test how much iron is in the spinach water after different periods of boiling, but am having trouble determining when the endpoint is. Every time the solution turns pink, it goes back to clear around one to two minutes later. Does anyone have any advice as to how I can determine the endpoint? Or maybe I should change my indicator to a more potent solution? Any help will be very much appreciated!
Last reply by Greasygoose, -
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Does anyone have any tips on how to revise for HL chemistry? Are there any good websites i could use? Thank u
Last reply by AnnaHoffman, -
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Option A: Materials Option B: Human biochemistry Option C : Energy Option D : Medicinal Chemistry Which one do you think is easier? Option A or C? they have the same extension and I have to prepared it by my own in English (I'm spanish)
Last reply by paulamya, -
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1 Butane lighters work by the release and combustion of pressurized butane: 2CH,(g) + 130, (g) 800, (g) + 10H,00) Determine the limiting reagent in the following reactions: 1- 8.72 g of C4H10 and 28.8 g of O2
Last reply by Biya, -
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Hello everyone, I am currently writting up my IA for chemistry but I have to a realisation that my data is really not helpful and I don't know what conclusion I can draw from it. My teacher made me redo my experiment twice because to him it wasn't possible (even tough I was following a method that I had seen online and on previous IAs). Anyway, He made me make 0.00004 M solutions of magnesium carbonate, calcium carbonate, and strontium carbonate, these are supposed to act as bases as they are found in antacids for stomach burns. (The concentration is very low because of the solubility of the compounds I used). I then put in a pH probe in 25ml of one of the solutions …
Last reply by octavea2323, -
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Hey, can anyone please help me with my chemistry IA- evaluation and conclusion. My research question is to find which type of food have the greatest energy content? I already did the experiment usinf 5 foods but I am confused how to evaluate this? Please help!
Last reply by 69_Sea_Men_Demon_69, -
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In this lab I had several problems: * Concentration of CuSO4 was 0.2 M. *No major changes in temperature. Min: 28 Max: 34 *Huge percentage error of 207.38% *We had to increase the amount of CuSO4 and Zn to be able to read the temperature because the thermometer couldn´t reach it. * We used an old polyestirene cup and a normal thermal cup's lid. *Lab instructions told me to use 25 ml of 1.0 M of CuSO4 and 6 grams of zinc, but I used 75ml of 0.2M of CuSO4 and 18 grams of zinc. *The graph I plotted with the data I got from the experiment is awful. Also, I was asked to trace a perpendicular line from when the zinc was added and a tangent line from the maximum point and using …
Last reply by anabelito234, -
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Hi, we have been asked to come up with a topic for our group IV i.a., i came up with the following but i'm unsure if its too simple for a whole written report Food Calorimetry, determining calories in certain samples of foods and comparing them to label seeing if it falls within the range and if its accurate. Thanks for any help!!!!
Last reply by AnnaHoffman, -
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Like both but can only choose 1. I’m not really sure how to decide. Ive already chosen chem but feel like physics is more suitable as I’m taking hl maths and also I do not like organic chem. from what I’ve heard both are equally challenging subjects. What made you decide to choose one over the other? Btw I’m not pursuing a science degree in the future thanks
Last reply by Gazuar, -
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I have a very neglectful teacher for chemistry and an even more neglectful IB coordinator. So what would happen is I would come up with a RQ he will the ones he doesn't like and after a few tries I find a RQ he likes then the next day I buy the materials for the lab 5 to 6 hours later he reveals that he doesn't like it anymore and I need need to find a new RQ and to do it over again. I am pretty sure this is natural if it happened once. However, he would keep doing this to me for a good 3 weeks maybe I am not just dedicated but I gave up after that. I wasted too much money on materials and too much time was wasted I can't keep up with my other classes. So I decided…
Last reply by The_Dude, -
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Halogenoalkanes can undergo SN1 and SN2 reactions with aqueous sodium hydroxide. Which halogenoalkane will react fastest with a 0.1 mol dm–3 solution of aqueous sodium hydroxide? A. 2-chloro-2-methylpropane B. 2-iodo-2-methylpropane C. 1-chlorobutane D. 1-iodobutane The answer is B but I'm unsure how. Thank you!
Last reply by CharliePalmer, -
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If I'm using a simulation for my physics ia, how do I do uncertainties? There are no uncertainties in the simulation.
Last reply by Anonymous1234567, -
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Please help me! I am supposed to design my chemistry IA, but I honestly have NO IDEA on how to even start. Chemistry is my worst subject and I have a lot of trouble in understanding it. I always try so hard on my IA's but I always end up making B's. I have to decide on one factor that affects the rate of a reaction to investigate in my design lab IA and this lab is supposed to be easily reproducible. Here's my IA guidelines: Aspect 1 includes: Formulating a focused problem/research question and identifies the relevant variables. Aspect 2: Designs a method for the effective control of the variables. Aspect 3: Develops a method that allows for the collection of suffic…
Last reply by Chemismykryptonite, -
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So this thread can be used by anyone who feels overwhelmed abt the upcoming exams…I am also a student like you all and i take HL chemistry…i got a 3 on my mock exam which means i have to study harder to raise my grade to a 5 if i want to get to UNI…so that bits abt me i am so stressed rn if anyone has any tips for the preparation of the last exam…please share some
Last reply by allydimmy-62, -
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I was thinking about doing my Chem SL IA on the decomposition of hydrogen peroxide catalyzed by catalase found in a potato. I was going to change the particle size of the potato and determine its effect on the rate of decomposition I am a bit concerned if the method I am using is okay. I asked my teacher if I could use a gas syringe to measure the gas produced, but they said the gas syringes they have are not great and have a lot of uncertainty. An alternative was to add soap to the hydrogen peroxide and measure the time it takes for the bubbles to reach a certain height. Or could I somehow use a eudiometer to measure gas produced? Is this an appropriate method?…
Last reply by nomzy98, -
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Okay so I am in HL Chem and I am worried my IA idea might be too simple or obvious. Basically I want to test if the temperature of water affects the rate of the Acid Base reaction between Sodium Bicarbonate and Citric Acid in bath bombs. I would make the bombs myself to standardize the amount of everything that goes in and test a bunch of different times in water at different temperatures. Then I time the reaction to see how long it takes in each different temperature of water. My one concern is that it seems a bit too obvious that the temperature will affect the rate and I worry that it's just to simplistic for an HL student. Some ideas I had to make it more complicated …
Last reply by AnnaCamach, -
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Does anyone a rough percentage of the question-share of topics in the IB chem exam? Or which are the most tested topics? Anything I should study extra hard for? Thank you!
Last reply by chaddeus, -
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I am doing chemistry at HL but my IA is on electrolysis and I've just been told by my teacher that it is SL and can't be done at HL. Then she told me it didn't matter. I'm really confused. Should my IA be on an HL topic area or can I do an SL topic? Will i lose marks if it is SL and I'm doing HL?
Last reply by Tobyd, -
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I currently have a textbook by John Green and Sadru Damji and its making chemistry HL Hell! I'm only halfway through year one but i'm going to fail with this book. Could someone please recommend another textbook that they find favorable. Any opinions on these two books: Chemistry for the IB Diploma by Christopher Talbot and Richard Harwood or Higher Level Chemistry (Pearson Baccalaureate)
Last reply by IBsciencewhiz, -
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I'm an IB student who's working on the chemistry and biology IAs right now, and I'm still struggling with choosing a good topic. I have an idea for chemistry, but it comes from one of the required practicals I did in school, and I'm not sure if that is discouraged by the IB. Is it fine to take a practical done in school and adapt it for the IAs? Please let me know what you think, any advice will surely help!
Last reply by Mary123, -
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Hey does anyone know how to get different pH levels of sulfuric acid? Right now I'm using a pH meter and adding drops of 1M sulfuric acid (but literally the pH drops so fast so its hard to get a nice range like 3, 4, 5, etc) , does anyone have any tips on what to do? Im trying to imitate acid rain and see how different concentrations of this effect my plants
Last reply by iwannapassyuh, -
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Hello, I am writing this because I'm not sure if this is a good idea for my IA or not. I want either measure the effect of caffeine on pepsin activity, or effect of temperature on pepsin activity (or maybe effect of temperature on the effectiveness of antacids in inhibiting pepsin activity?)
Last reply by faten, -
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I would like to do an IA on the effect of antacids on neutralizing stomach acid, using diluted HCl, but I've been told it's siding more towards Chemistry. Are there any ways that I could make this more of a biology related IA, and how can I do so? Someone told me to involve an enzyme, like pepsin, but I'm not sure of what to do with it. Thanks!
Last reply by nini124, -
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Hi So I'm just doing my chemistry IA and I'm trying to calculate my uncertainties and I was wondering if I need to use the unmeasured uncertainties from my experiment for a the final uncertainties. For example, adding the uncertainty of measuring a chemical from a measuring cylinder while the final answer is something weighed in grams. Would I need to include that and if so, how?
Last reply by am4lie, -
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Ok so the question asks, 'calculate the no. of moles of iron in 0.982g of Fe(NH4)2(SO4)2.XH2O its from a past IB exam paper. If possible, explain what to do instead of just stating the answer. Merci.
Last reply by Lilpeepforever, -
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Hello I am a DP student who does chemistry HL I've been dying trying to think of a good experiment for my IA but all I managed to come up with was testing temperature on the Iodine clock reaction but then I realised this experiment is too simple and has no real world application that I can personally link too so I need help to know weather if this is good enough for an HL chem IA
Last reply by faten, -
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How do I use a spectrophotometer to determine tannins in a substance? (this is for a practice IA topic)
Last reply by potato_papa55, -
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Hello everyone, I ran out of time for my Chemistry Internal Assessment and was advised to do the IA without any kind of experimentation. I would have to search data through the internet yet I don't know how to do it as I don't have any kind of experience in making this kind of work. If you could advise me as to what kind of topics I can look at or where I can find clear guidelines I would forever be in your debt:) Thank you.
Last reply by Jognsba, -
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Hi, I am on my sophomore year and have to choose my Ib subjects by September. I would like to study engineering but I am not sure if I should take chemistry in Ib or not. I am currently planning to take: Maths HL, Physics HL, Visual Arts HL, English SL, Spanish SL and business management SL. I am not sure if chemistry is required, and I don't like the course enough to take it on Ib. Should I take chemistry? I am planning to study civil/ mechanical engineering. Thank you.
Last reply by Jognsba, -
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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?
Last reply by sahiba, -
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My Chemistry teacher has been very good about posting IA resources for us, so I thought that I'd share them here. Possible IA Chem Real Labs 1. Stoichiometry – investigating eggshell(Type of egg/Age of chicken) 2. Stoichiometry – investigating anti acid tablets 3. Kinetics – Effect of Conc/Type/Temp of acid on rate 4. Effect of Temp on Vapour Pressure 5. Effect of Acid/Ph on eggshell/teeth 6. Effect of Conc on E of a cell 7. Effect of Current/Time on electroplating of zinc on iron nails. 8. Effect of time on decomposition of Hydrogen peroxide 9. Effect of Temp on Conductivity of Water/solution 10. Enthalpy of combustion of alcohols 11. I…
Last reply by EllaMilo, -
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Hi everyone, I'm currently searching for chemistry ia ideas. My initial idea had to do with caffeine extraction from tea by titration, however I'm really confused about the method. I've mostly found procedures involving chloroform, which I will however not be able to use for my lab. I also came across a method that uses iodometric back titration, but there doesn't seem to be much info about it online... Does anyone have experience with this method, or has done their ia on a similar topic? I'm really interested in it but I'm concerned that it's way too complicated (i'm in chemistry sl and we haven't done any practicals during ib year 1 due to covid, so i'm looking for some…
Last reply by nv_xx, -
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Hey! I present my exams on November 2022, and I was wondering what good topics could there be for chemistry. I’d like redox reactions, for example the oxidative properties of a fruit or something like that. Also, maybe something related with acid deposition. Thanks! I really have no idea of what to do.
Last reply by asapyoon, -
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Hello everyone! My chemistry IA involves increasing temperature of a reaction in a closed system. I need to find out the concentration of the reactants while doing so, but in a real life experiment, it is impossible to constantly check for the concentration of the reactants while heating without affecting the reaction. So, I decided to go with a simulation, but can't find any website where I can perform my own experiment. Could you please suggest some?
Last reply by sanya_mishraaaaaaa,
