Chemistry
For Chemistry Discussions
1,617 topics in this forum
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Hey, I am kinda stuck on how to calculate the peroxide number in an titration experiment. as far as i know, i am supposed to find the amount for the sodium thiosulfate and for the iodine? its for my experiment with oils to calculate the peroxids ? how do i do? please PM me.
Last reply by Tom Hiddleston, -
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My Chemistry IA is testing the affect of cooking time on the Vitamin C content in broccoli. Working on my analysis and stuff, I feel like it's more biological than it is chemical and I'm kind of concerned. I feel like the only Chemistry that's been done in the entire IA was the titration bit with DCPIP to calculate the ascorbic acid content. Is there a way to make this more of a Chemistry IA without actually changing the practical? Or am I over thinking it and the Chemistry part of it is sufficient? Thanks guys x
Last reply by Tom Hiddleston, -
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Hey guys, I was wondering if my IA mark will be lowered due to the simplicity of the lab. I am testing how the concentration of hydrochloric acid affects its rate of reaction with magnesium. Although I came up with this by myself and the teacher somehow approved it, there are many videos online on how to do this experiment. Will any of these factors reduce the mark I get? Should I change my topic?
Last reply by Tom Hiddleston, -
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I need help coming up with an idea for my chem IA. I want to do something on pH levels in toothpaste and how that can act as a neutralizer for a specific acidic fruit juice. The only problem is that I don't know if this idea is good enough to work with and come up with a proposal.
Last reply by Tom Hiddleston, -
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Hi y'all, first post so I'm kinda nervous So I have been asked to think on my Chem IA, and I've been thinking about this: Testing and comparing the calcium content of various nutrition supplements (pills, tablets etc) and if I want/need to, put those figures in scale to daily recommended intake of calcium and therefore determine the 'most suitable' product. I'd like to hear what y'all have to say on this topic, and also tips for how to test for calcium quantifiably~
Last reply by Tom Hiddleston, -
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Hey guys, my topic for my IA is how the concentration of hydrochloric acid affects its rate of reaction with magnesium. The teacher said it was okay but I am unsure on whether or not it's appropriate since it's really simple. Should I still go ahead with my topic or will I be penalized if I do so?
Last reply by Elite X-Naut, -
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Hey guys! My chem IA is coming up, and to say the least, I'm kind of lost. I would like to do something about caffeine as a drug, but I don't know which experiment could be done on this - or if it's maybe too simple. Another possibility could be to do something on rate of reaction, as that is my strongest topic, but yet again I find it difficult to come up with a suitable experiment. Does anyone have a suggestion, which can maybe help my process a bit? Thanks in advance!
Last reply by Chemstryandbio, -
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Hey! I'm doing my IA on studying the effect of change in concentration of electrolytes in a voltaic cell. I've taken readings of different materials and shown the different amount of change for each change in concentration (0.2, 0.4...) Is this topic good enough for HL? If so, what can I include as the purpose as the one I have isn't very significant (at least that's what my teacher said) One more thing is that we have to include uncertainties for the data. I've used a simulation so there won't be any uncertainties as such but my teacher asked me to calculate the uncertainty of the Nernst equation. A part of it is (log Q).. what will be the uncertainty of this? Thanks in …
Last reply by kw0573, -
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Hey i need help on my Chem IA My research question is: What effect does the amount of ethylene, have on the time taken of climacteric fruit ripening? I am doing a database based IA. I am also doing a really dumbed down experiment to support the data that I can find online. Can someone tell me how to start this. By database can I just find articles online and then cite them? Or find other websites that explain what is happening and what affect ethylene has on fruits? I don't understand how to do a database based IA. Any good databases? Anyone?
Last reply by kw0573, -
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Im planning my chemistry (2016 syllabus) Im very interested in environmental chemistry, and since the new syllabus is going to put a lot of emphasis on personal engagement, i thought it was important to think about that. I want to investigate the effect of increasing ocean salinity on the concentration of dissolved oxygen. So my plan is to prepare different solutions of different salinity ==> here is some chemistry maths.. Then Im planning on measuring the oxygen content using a sensor. I have a hypothesis, backed up by solubility theory which i can support or reject. I can prove a trend or disprove a trend. HOWEVER, is the design of my experiment TOO simpl…
Last reply by Liv S. Sletten, -
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Hey guys So I'm about to find a topic for my chemistry IA, but I am thoroughly lost. Chemistry is not my strongest subject, but I feel comfortable and good at Rate of reaction, collision theory and equilibrium. I need some inspiration in regards to finding a topic that is at an appropriate level for getting a decent grade, but also for me to understand what I'm doing. Do you have any good ideas? My teacher says that it should relate to my everyday life, soooo.
Last reply by Liv S. Sletten, -
Hey I am now in my last year of IB taking my exams in May ^^ but I transferred from a school in Palestine to Denmark, and so I got a little confused regarding the different methods used in those places, plus my classmates studied things last year that I hadn't taken, and so it was quite messy for a while. I did my Chemistry IA about Wastewater treatment. But I have absolutely no idea how to put in my qualitative data, I have no clue how to portray anything, I tried looking online for some guides, but I just can't seem to figure out how to process the data. And my classmates were done with their IA's last year, so my Chemistry teacher says that it is my responsibility…
Last reply by asarj, -
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For my IA, I'm going to compare the effectiveness of 5 brands of antacid in curing an acidic stomach I'm getting conflicting opinions about the topic. My teacher says it sounds okay, but everyone else is saying its not rigorous enough for HL (which I'm really worried about). Do you guys think it sounds okay, and if its not is there any way I could alter the same experiment to make it complex enough(like by fitting some HL topics into it, like pH curves or buffers)? Thanks a lot!
Last reply by EmotionalEwok, -
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Hi I know most of you are worried with EE and TOK but I would appreciate it if you could help me out: The question: Which compound's molecular formula is the same as its empirical formula: A. C2H5OH B. CH3CHOOH C. C6H6 D. C8H18 I know its obviously not C or D, empirical formulae: CH and C4H9 but I dont know for the first two please help...
Last reply by Msj Chem, -
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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
Last reply by willsurvive, -
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Hope this is some good motivation for you guys http://www.ibsurvivors.com/new-blog/7biology
Last reply by ibsurvivors, -
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Here's a list of all of the definitions required in both HL and SL. I placed them all in boxes so that flashcards can be made and to make it easier to memorise. Chem definitions.doc
Last reply by Keun Yeong Kim, -
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Hi! Does any one have some good Chemistry IA topics, that might attract a good grade. Like I mean, if I were to do an IA on Kinetics (does temperature increase reaction rate), it would be super easy and I would probably get a lower mark on it, since its so easy. What experiments can I do?
Last reply by antiyoyokid, -
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I am doing an experiment where i try to see how the boiling point of water changes with concentration of the solution. Generally there should be a rise in the boiling point but when i am experimentally trying to calculate the boiling point , the value i get is lower then 100*C so can you guys help me. Experimental setup: heating the solution and measuring the temperature periodically till i get a constant temperature. If something is wrong with the setup please help
Last reply by Kunal, -
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Hey. I need help for my chemistry assignment variables for my IA. What I am doing is that for 4 oils (sunflower oil, rapeseed oil, coconut oil and olive oil ) I am testing the peroxide value difference when they are fresh and after being heated through titration. I have exactly four same size circular eggplants that I have put in each cooked oil. I made sure that the they were heated in 180 degrees celsius. However, I became very much confused to which were my variables? Controlled: 4 oils Independent: temperature of oils (180) Dependent: Peroxide value??
Last reply by batool, -
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Hiii, okay so I'm freaking out about my IA just a little at this point. I decided to do datamining and research the effect of crystal lattices on the ksp (related to solubility) values of ionic salts. So right now I have this huge table of ksps, but I'm not sure what to do with them. I started by comparing all of the fluorides with their respective crystal lattice and that was good but now I am a bit stuck. And to make it worse, I can't really find a source/website that has pictures of all the different crystal lattice types. At this point I pretty much know that the size of the ions and the intermolecular forces are what affect ksp, but how do I go about showing this in …
Last reply by tina666666, -
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For topic 4/14 what are the elements that can break the octet rule. (HL ones included please) Also can Xe have 5 or 6 electron domains? If so, how are we supposed to know which one to use. E.g XeF4 How are we supposed to know whether XeF4 has 5 or 6 electron domains? Please help
Last reply by Miami Hussain, -
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So there's a new syllabus for the May 2016 exams... We only have to do 1 option (I'm doing biochemistry). I was wondering how everyone's studying for Section A which is based off of the compulsory labs? Does anyone have any idea what kind of questions will appear?
Last reply by Msj Chem, -
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What I'm trying to ask is pretty obvious from the title, but I still want to know. I'm doing the DP next year and I want to know how much math is involved in Chemistry HL. I'm decent at math, this year I'm getting 80% in math so far. I have two options for next year, I can do Chemistry HL and SEHS SL or Biology HL and Chemistry SL. I want to do something in the medical field in the future and I just need some advice. So how much math is involved
Last reply by NiCKEL, -
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Hello, So as far as I know, group 4 IA's this year are radically different from previous years'. The IA is out of 24, but what are the cut-offs for 5, 6, and 7? Is there like some global standard, or is it just per class? Thanks.
Last reply by Msj Chem, -
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In the classic example that the 2016 curriculum gives is an electrolytic cell with CuSO4 solution and inert or copper electrodes. It explains that with copper electrodes, a slighlty different reaction takes place at the anode and there is no net reaction, but a reaction is still occurring. Since both the inert and copper electrode examples say they result in the formation of copper on the cathode, I assume that's all from Cu2+ from the solution? So it doesn't actually matter what the anode is if the goal is to cover the object? The reason I ask this is becuase I've seen questions like "in ordere to plate an X with Y, the X needs to be the...(multiple choice)" and I was …
Last reply by Msj Chem, -
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Hi, Just read an online guideline that says that chemistry IA research questions should use a chemistry-based independent variable. Unfortunately, i've just finished my IA with the title "An investigation into the neutralising properties of different antacid tablet brands" in which i take different antacid brand and determine which neutralise the most acid using a back-titration. I also explain this using the chemical equations for each base used, and i measure the initial rate of production of gas of the tablets, in order to determine which would cause the least discomfort. I'm now worried that my IA may be too "supermarket" based, and not enough in chemistry. Do …
Last reply by Msj Chem, -
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So I am an sl chemistry student and for my mock exams, I really want to do well on my exams like at least a 5. What would be the best method to do so?
Last reply by Msj Chem, -
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Which ions float through the salt bridge in a voltaic cell? I know the ions of the salt within the bridge move for sure (e.g. K+ and NO3-, but do cations formed by oxidation (e.g. Cu2+) of the electrode and anions of the compound that made the electrolyte move as well? (e.g. SO42- from a copper II sulphate solution)
Last reply by kw0573, -
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Hey guys! Today in Chemistry SL we learned that the solubility table/guidlines are not given on the data booklet for double displacement reactions. Every site or picture I researched are not specific enough to overlap a lot with each other. Is there any solubility table specific to what the IBO wants us to know? If so, what are the easiest ways to memorize the rules? The chart that we are currently using is this: http://imgur.com/imn3E3x
Last reply by Msj Chem, -
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Hey guys, Im writing an IA on a titration experiment and was wondering if you guys have any tips for IA's in general? Thanks!
Last reply by Msj Chem, -
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I'm doing my chemistry IP (previously known as IA) using a simulation, since its difficult to perform the experiment in the lab. What uncertainties could be there in this case and how to improve them?
Last reply by Msj Chem, -
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Hello guys, I have been scoring 3 and 4 in the past mock exams and i am going to write my exam in this November session How to improve my points within this month? Thank you Reply ASAP
Last reply by Msj Chem, -
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I'm looking for a workbook that has like a LOT of practice questions. Doesn't have to be IB specific, as long as the content is mostly the same and helpful. Really doesn't matter if, say, there's about a 2-pages worth of extra stuff that's beyond our level in each chapter, I'd rather have that over question's that aren't challenging enough. I already have the Pearson Bacc for heavy reviewing and our school's Oxford study guide for occasional use. EDIT: purpose? I want to be able to do the easier (for our curriculum) questions with ease so that I can focus on harder questions on test because I really want that 7. The more questions I'm exposed to the better I usually d…
Last reply by NiCKEL, -
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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?​
Last reply by Msj Chem, -
Titrations
by Guest- 3 replies
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Calculate the molar mass of a monoprotic acid anhydride if 1.25g of the acid dissolved in 50.00mL of solution needs 38.25 mL of 0.170 M sodium hydroxide for complete neutralization. answer: 192 g/mol
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Acids/Bases
by Guest- 1 reply
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Calculate the pH of a 0.30 kmol/m^3 solution of the following: a) NH4NO3 (ammonium nitrate) = 4.89 b) NaF = 8.32 c)CH3COOK = 9.11 d) Na2S =13.18 Please help! Please show you're work with details and explanations.
Last reply by Msj Chem, -
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I wanted to ask if comparitive study is acceptable for chemistry, where there is no dependent-independent relation and where a property or phenomenon is compared in different brands for example
Last reply by Msj Chem, -
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These websites are very useful if your ia is researched based and so you are using results from a past study to investigate a new topic. It is also useful if you have not come up with an approved topic yet because they show all types of different possible experiments in chemistry. It also helps if you need outside research for your topic. Membership for most of these websites is free or your school may be a member. However, not every journal is free. I don't think any study released this year is free. In spite of this, these websites can save your grade if you can't come up with an approvable or doable topic. Royal Society of Chemistry ACS Publications Wiley Online Libr…
Last reply by NOhene, -
Chem SL/HL MC Help
by Guest- 3 replies
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1) How does the pH of the mixture change as NaOH is slowly added to a solution of HCl? The pH increases and may rise above 7The pH decreases and may fall below 7The pH increases to 7 and stopsThe oh decreases to 7 and stopsThe pH remains at 7Answer: The pH increases and may rise above 7. How? 2) To 100mL of 1.0 M aqueous HCl, enough water is added to make 1.0 L of solution. During this dilution, the pH falls by about 1 pH unitfalls by about 10 unitchanges by about 9 unitsrises by about 1 unitrises by abouit 10 unitsAnswer: rises by about 1 pH unit. How, why? 3) What is the concentration of hydroxide ions in a solution of 0.350 mol/L HI? 0.350 mol/L0.175 mol/L2.86 x 10…
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At midterm in ib chemistry hl part 1 i am getting a level 4 can i boost it to level 7 before uk application are due (which are october 15, 2016)
Last reply by Isobellee, -
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for a reaction like X + Y + H2O ---> A + B what would the half equations be? How is the water factored in? EDIT: Also for AB + HC ---> AC + C + B where compound AB is copper and sulphur, and compound AC is copper (II) nitrate so it needs both reactants...how do I separate this into a half equation? I can see that C will come from HC like HC ---> C and B will come from AB like AB ---> B but I don't know how to do these weird combinations
Last reply by kw0573, -
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Hello, I am studying for my unit 4 exam on chemical bonding however when I am doing practice questions, for example: ii) Identify the number of sigma and pi bonds present in trans-but-2-ene-1,4-dioic acid. How do I find the formula for this compound, it is not in my data booklet. Where would I find the formula to this compound if it is not given in the problem or in the data booklet? This is from the Pearson HL Chemistry Textbook Review Questions. Thank You!
Last reply by Msj Chem, -
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Hello! I try to find the mechanism for the following chemical reaction: 2KI(aq)+ H2O2(aq) + H2SO4(aq) Ã K2SO4(aq) + I2(aq)+ H2O(l) The rate equation I got is as following: Rate = k * [KI] * [H2O2] * [H2SO4] I was thinking about the following:2KI+ H2SO4 Ã K2SO4 + 2HI2HI+ H2O2 Ã I2 + 2H2O But it does not fit my rate equation. Maybe you can give me a hint? I think I am doing something wrong here. Thank you in advance!
Last reply by Msj Chem, -
- 5 replies
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Based on a table of Indicators, Acids, and their colours created, how do you determine what is the strongest acid? The row headers are a selection of general acids HA1, HA2, HA... and the column headers are a selection of general indicators in their acid form, Ind.1, Ind.2... I don't need the exact answer so I didn't provide the exact question but how do you compare the strengths when the acid solution and the indicator is in the same comparing "batch"? I would compare pKa of indicators if I was just looking at indicators, but there's no numbers at play here. How do I approach the question (hopefully this is enough info)? Just a hint to get me going should be good
Last reply by kw0573, -
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I began the first part of my chemistry IA. I planned to do an experiment by replicating artificial photosynthesis on a small scale like researchers at Stanford have done. However, I would have to make the catalysts for water splitting myself. I don't have the means to do this. My teacher approved my idea, but he said it would be better if I did a research based experiment. My issue is that I cannot gain access to any studies or lab reports on artificial photosynthesis without paying around $30 for them. I'm not sure what to do about my IA and I think it's too late to change my topic. Is there anybody who could lend any advice?
Last reply by NOhene, -
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- 516 views
What's the Difference between Pre-IB , AP and IB Chemistry ? Does one have more content than the other?
Last reply by Msj Chem, -
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Good afternoon. I have a question which is quite simple. I am supposed to do my Chemistry IA on iodine clock reaction and then find the rate of reaction and other interesting things. However, I did the following reaction: KI + H2O2 + H2SO4 -> K2SO4 + I2 + H2O and I varied the concentrations of KI, H2O2 and H2SO4 Is this an iodine clock reaction? And if not, what can I do with what I have? Thank you in advance.
Last reply by Sofya, -
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What are the possible topics I can do for upcoming chemistry IA? I really have no idea which section of the syllabus to cover and which section would be the best to perform an experiment as well... I need help as soon as possible
Last reply by Msj Chem, -
- 3 replies
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Hi everyone, So for the last two years my modus operandi in Chemistry HL has been to use Richard Thornley's videos to learn the content, practice it with past paper questions and review with the Oxford revision guide - which has been fine and I can usually pull off about 85% on Paper 1 and 2. What's really thrown me off, however, is the options - Richard Thornley doesn't have much material on either of my option topics (Human Biochemistry and Environmental) and I don't absorb information as effectively from the textbook. It's putting my grade in danger due to low Paper 3 scores - does anyone have any useful resources for options B/E that are well organised and easy to r…
Last reply by Msj Chem,
