Chemistry
For Chemistry Discussions
1,617 topics in this forum
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- 6 replies
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Hi :-) I am a very passionate amateur chemist and I want to know if I could do all 4 options of chemistry and learn some further org chem. It's pretty like further math, where you study 4 options of math and some further geometry and algebra. I am the only HL student in my grade along with 2 SL students and I think my teacher could spend lots of time on us. So I am wondering if this is possible. Thanks
Last reply by Aquilina, -
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- 546 views
Hey Guys, Like most people in IB chemistry, I too am Junior and I was just seeking some help or advice on a research topic I am hoping to preform for my IA. So far, the research I plan on doing seems like it will be investigating the heat release of the combustion of different fuels aided by different oxidizers that will speed up the combustion or agents that will slow the combustion down. I hoping to show with this experiment how using these agents how it will either increase or decrease efficiency or completeness of combustion. And, if so, show how using one agents rather than another will allow for a greater, more efficient release of potential energy from the com…
Last reply by K.Silas, -
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Hello, First year chemistry SL student here. I am struggling a lot with this subject, so I was wondering how all of you chem geniuses study? Any useful links would be much appreciated!
Last reply by Aquilina, -
For my extended essay I carried out an experiment in which I synthesized biodiesel from canola oil, I then carried out a second lab with it to find the enthalpy of combustion of each sample of biodiesel that I made. Is this too simple? I did not really have an independent variable in this experiment is that an issue?
Last reply by chillycorndog, -
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Hi, does anyone know for 2017 may, what are the required format for chemistry sl ee and ia in: font size font type margin around the paper space within paragraph and between paragraph Thanks!
Last reply by kw0573, -
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Hi, i am an IB junior this year, and I was wondering how I could go about doing a dry ice acid-base neutralization for an IA. I have no idea how to setup an IA or even make it 10hrs long! HelP!
Last reply by kw0573, -
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Please help me with this question: Question: 25.0 cm3 of 1.00 × 10–2 mol dm–3 hydrochloric acid solution is added to 50.0 cm3 of 1.00 × 10–2 mol dm–3 aqueous ammonia solution. Calculate the concentrations of both ammonia and ammonium ions in the resulting solution and hence determine the pH of the solution. Mark scheme: initial amount of HCl = × 1.00 × 10–2 = 2.50 × 10–4 mol and initial amount of NH3 = × 1.00 × 10–2 = 5.00 × 10–4 mol; final amount of NH4+ and NH3 both = 2.50 × 10–4 mol; final [NH4+] and [NH3] both = = 3.33 × 10–3 mol dm–3; [OH–] = Kb × = Kb = 10–4.75 /1.78 × 10–5; pOH = 4.75 hence pH = 9.25; I don't quite understand …
Last reply by Msj Chem, -
- 2 replies
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Please help me with this question: Determine the pH of a solution formed from adding 50.0cm3 of 1.00moldm-3 ethanoic acid, CH3COOH(aq), to 50.0 cm3 of 0.600moldm-3 sodium hydroxide, NaOH (aq) mark scheme: (initial)[CH3COOH] = 0.500 mol dm–3 and) eqm [CH3COOH] = 0.200 mol dm–3; (initial)[CH3COO–] = 0.300 mol dm–3 and) eqm [CH3COO–] = 0.300 mol dm–3; Allow 0.02 moles and 0.03 moles instead of 0.200 and 0.300 mol dm–3. [H+] = Ka = 1.16 × 10–5 mol dm–3 / pH = pKa + log; pH = 4.94; Award [3 max] for correct final answer if no working shown. I'm not sure where that "(initial)[CH3COOH] = 0.500 mol dm–3 and) eqm [CH3COOH] = 0.200 mol d…
Last reply by kw0573, -
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The experiment I'm conducting measures the rate of reaction for varying baking soda (sodium bicarbonate) concentrations. I will be putting tarnished silverware into a bath of water and soda within a beaker that is lined with aluminum foil. I conducted this experiment, and my trials suggest an exponential trend. Now when calculating the rate of reaction, I need the equation in order to find the rate order equation. Using prior research, I can determined the equation to be 3 Ag2S(s) + 2 Al(s) + 3 H2O (l) –––> 6 Ag(s) + 3 H2S (aq) + Al2O3(s). I don't see the baking soda coming into play in this equation, despite being the changing variable (as in factor affecting the rate…
Last reply by kw0573, -
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I don't understand how to do this question. Would anyone help?
Last reply by Msj Chem, -
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Hi, I'd just like to ask if anyone knows whether ECF is completely applied throughout a Chemistry Paper 2 and/or 3. In the marking notes of the Specimen Paper 2016, the following is stated: Occasionally, a part of a question may require an answer that is required for subsequent marking points. If an error is made in the first marking point then it should be penalized. However, if the incorrect answer is used correctly in subsequent marking points then follow through marks should be awarded. When marking, indicate this by adding ECF (error carried forward) on the script. “ECF acceptable” will be displayed in the “Notes” column. …
Last reply by IB`NOT`ez, -
What would happen to the pressure of the gas if the temperature and volume of the gas is doubled
Last reply by Msj Chem, -
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Hi I am designing my chem IA on quantitative determination of acid content and doing one on acidity of vinegar and I'm not really comfortable with Chemistry IA's... And it seems like google isn't really helping me at all. So just a quick question because I just wanted to be sure, would temperature and exposure to air affect the acidity of Vinegar? Are there any other factors? Also, if I wanted to do temperature or air exposure, what would you recommend the temperature or time range should be? Thank you so much! I really appreciate your help!
Last reply by AliceF, -
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- 544 views
Hey! I'm done writing my Chemistry IA and would like a second opinion from someone who's not from my school. If anyone would be interested in reading my IA and giving my suggestions and feedback, please e-mail me at [cut]. Thanks!
Last reply by Lynn Gweeny, -
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- 444 views
I'm stuck in this two point question... can anyone help? During this experiment it is possible that not all of the magnesium would react with oxygen. State one may that the reaction could be helped to completion and how the final mass would be affected if the reaction did not complete. I'm sure you're all familiar with the experiment (heating magnesium in a crucible and lifting the lid to get air/oxygen in to react with air) so please help! Due tomorrow
Last reply by joanapt, -
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Hi everyone!! My IB chem SL teacher already approved my research question given I could figure out enough chemicals to use that we have in stock/can order. I'm using boric acid, hydrochloric acid, acetic acid, ascorbic acid, phenol, ammonia (aqueous solution), water, hexane, and toulene. All the solutions/acids will be at 0.1 M. Anyway my research question is "Do molecules of the same bond angles exhibit a consistent boiling point trend?" which of course I will change so the wording's clearer, etc. Does that sound workable? I'm quite excited about the experiment and I'd love to keep it if possible.
Last reply by Susannah, -
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1. When going down the group 17 why does the boiling point increase ? what does it mean by polarizability 2. When water evaporates is the Van Der Waals forces being broken down or just the hydrogen bonds ?
Last reply by Msj Chem, -
- 1 reply
- 458 views
My teacher said our topics were supposed to be handed in late september, and I did so, but my idea was rejected, and done so again after I submitted a different idea. The IA 1st draft is due Nov.28 and I have an experiment now, but I still feel like I should ask for her approval but I feel like she'd be upset at me for holding it off so long and she won't approve my topic or do so as a last ditch effort to get me to pass something in. What should I do?
Last reply by kw0573, -
- 4 replies
- 891 views
Hi, Could someone please help me with this question: Which statement is correct about the electrolysis of molten PbI2 1) Chemical Energy is converted into electrical energy 2) Pb2+ ions are oxidized at the negative electrode (cathode) 3) I2 is produced at the positive electrode (anode) 4) Ions are produced at both electrodes Why is the answer 3) ????? Thanks
Last reply by Msj Chem, -
- 0 replies
- 457 views
Our teacher just introuced us to the internal assessment and I am currently doing a brainstorm to decide my topic. So far I have identified my favourite topics/chapters which was equilibrium, acids and bases and organic chemistry. Equilibrium is probably my all around favourite. I did my EE in chem within chemical kinetics so I dont want to do that again. Suggestions or ideas for experiments or topics would be highly appreciated
Last reply by Svinsern, -
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Hi everyone, This might sound very retarded and I know I messed up a bit. I got my IBDP in May 2016 with a 35/45 with a 3/3 for TOK+EE. My 2 best subjects were Bio and chem HL throughout the 2 years as I had continuous 7s. Unfortunately I had a surgery a few months before the final exams which cost me 2 months of classes missing out on time to do my IAs, EE and I also missed a lot of the portion for the exams. My 2 best subjects ended up having the worst grades in my finals. (I know i hate my luck) I got a 5 in bio (missed a 6 by 1) and Got a 4 in chem (I WAS HORRIFIED). I'm applying for medschool so even though my 35 is way above the avg ib score I needed better sco…
Last reply by ChocolateDrop, -
Hello, Our school is offering us the Pearson textbook for chemistry, which I have heard is for the old syllabus... I have read on different threads that there is a new syllabus for chemistry starting 2016, and was wondering whether using this textbook mentioned above is still fine? Do I need to buy the new Pearson chemistry textbook for the new syllabus, or can I stick with the current one? Thanks!
Last reply by ChocolateDrop, -
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- 487 views
Is this good, or too simple lmao i feel like everyone has done something like this though
Last reply by abelkoontz, -
- 6 replies
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A compound consisting of carbon, hydrogen and oxygen has a mass of 40.85g. Analysis shows that the compound contains 10.90g of carbon and 0.90g of hydrogen. What is the percentage compositions of the compound?
Last reply by azara, -
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- 583 views
I want my IA topic to be about unsaturated fats. Currently I have decided that I want to do the following: Calculating the percentage of unsaturated fats in different oils. Independent variable would be the different oils and dependent would be the percentage of unsaturated fats. Would this be okay? Or should I do something like unsaturated fats and the rate of evaporation. Where different percentages of unsaturated fats (different oils) will be taken the rate of evaporation will be seen? If i do, do the rate of evaporation, how would I calculate the rate? I also read that cooking oils takes long to evaporate so what oils would I use?
Last reply by kw0573, -
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hi for my chem IA i am doing "the effect of salt on rate of which ice melts" and my personal engagement is my interest and curiosity about why in colder countries, the distribute salt on icy road, so the story is i have asked the teacher about this idea and she said it was an "ok" experiment which i plan on changing the concentration of NaCl on different solutions and measure the rate of which the ice melts every 30 seconds for up to a minute. the topics i would be covering would include stoichiometry, intermolecular forces and how NaCl disrupts the equilibrium...etc prior to the choosing of this experiment i have given her many ideas however she said "n…
Last reply by kw0573, -
- 1 reply
- 995 views
I really need help on deciding the research question on which I will right my IA on. I am thinking about doing an experiment on submerging the apple into solutions with different acidity and determining the browning of the apple but I don't think it will work though cuz I really want to have a quantitative data.
Last reply by kw0573, -
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What are we supposed to include in the personal engagement? Is it only about my personal interest about the topic that I chose?
Last reply by kw0573, -
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- 668 views
So I want to do an IA on organic chemistry, because it's really interesting to me! I have an idea of what I want to do, but I don't know how to make it "analytical" as my teacher has said? My idea is to figure out the reason why benzyl salicylate has an uncertain smell, and why it can only be smelled by some people. Should I do a survey with people from my school? Or dig deeper and try and discover the reason why some people can't smell it? Also I want to know if this idea is even feasible? Thank you.
Last reply by kw0573, -
- 2 replies
- 636 views
Hello there. I would like to see an example of a complete IA that scored good marks. Thank you
Last reply by ilike carrot, -
- 3 replies
- 380 views
Last reply by mushroom, -
- 1 reply
- 446 views
What is the difference between fluorescent and incandescent spectrums? They're both continuous...but what's the difference???
Last reply by Msj Chem, -
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- 523 views
This is for my chemistry IA but every method I found on google seems to require equipment that my school laboratory does not have (eg. Gas chromatography–mass spectrometry). Does any of you know of better/simpler ways to measure aldehyde content in a liquid sample using equipment that would be commonly available in a school laboratory? Thanks!
Last reply by kw0573, -
- 3 replies
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Okay, my chapter 2 exam is coming up now... I am just wondering what to expect most on the test, because I heard that there are some concepts in the new IB curriculum that are less important than others. So far, I have learned: Atom Theory(model theories), Nuclear Reaction, Geologic Dating (Decay), Electromagnetic Spectrum, Continuous Spectrum, Rydberg Calculations, Electron Configuration, Calculation (Wavelength, Period, Frequency), and Ionization Energy. I have heard that there is more focus on the concept-based subjects which requires explaining, but I want some reassurance. How should I prepare? Thanks everyone!
Last reply by Msj Chem, -
- 2 replies
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Hey, I'll be writing my IB retakes in a few days and I'm kinda behind already and I'm retaking them cause i only got a 4 in my May boards due to a mitigating circumstance. Guess Im a bit late to prep already but I wanna increase my score by atleast a point or two. I wan wondering if the study guide along with a few past papers would be enough to assure me a 5 or low 6. Mainly I'm not sure of which option to chose for paper 3. I did materials in the May paper but only got around 22/45 in Paper 3. I am retaking bio as well and so many of the option B topics seems similar. I wanted to know which is a more scoring section and would be able to get me enough marks t…
Last reply by Msj Chem, -
- 2 replies
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Hey, I've had trouble thinking of a chemistry IA topic that I could do an experiment on, I recently thought of a research question: how does the addition of unpaired electrons in an atom affect its paramagnetic strength relative to its weight? Is this a suitable topic for a HL chemistry IA topic?
Last reply by kw0573, -
Does ethyl ethanoate dissolve in water and do they form hydrogen bonds (intra // inter ) ?
Last reply by FChaosi_, -
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Hey guys, So we've just started our chem IAs and my IA is on how temperature effects the dissolved oxygen concentration in a sample of water from a lake in my city. I just wanted to ask if that is too simple a chem SL internal assessment topic. A reply would be greatly appreciated.
Last reply by Amina13, -
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- 383 views
HELP! I have a lab due tomorrow and I don't really understand how to do an error propagation. If someone could help me that would be fantastic. I have to do a propagation on how much CaCO3 is in eggshells.
Last reply by hgp999, -
- 4 replies
- 900 views
Help me with these questions please! There are quite alot... I'll really appreciate your help! 3. Ans: B How do I know oxygen is the heaviest? Is it because it becomes diatomic? 4. Ans: C No idea about this one 7. Ans: C... I thought this was B since noble gases do not have ions. Why is it C? 18. Ans: A No idea... I know increase in entropy would be increase in gas molecules... but what is this question 27. Ans: B How do I know? (I'm new to acid and base...started recently) 29. Ans: C How do I know...? Thank You
Last reply by Msj Chem, -
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- 542 views
hello everyone, So just last week we started our Internal Assessments for both Biology and chemistry and i just wanted to run some of my ideas through here if anyone could help me. So for biology i have decided to do chromatography on chlorophyll in plants. I was thinking comparing the chlorophylls in aquatic plants and land plants and then also putting them through a spectrophotometer. Can anyone suggest anything better or is this good enough for the IA. For the chemistry i'm seriously stuck. I need to talk to my teacher but first i thought i would come here to ask if anyone could suggest a topic for me (doesn't have to be specific). Currently i've thou…
Last reply by Elie, -
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- 733 views
A student wished to determine whether fats or sugars had the higher energy content. Small samples of stearic acid, C18H36O2(s) (a fatty acid) or sucrose, C12H22O11(s) (a sugar) were burned and the data collected as shown below. Sucrose Stearic Acid Mass of sample 1.55 g 1.17 g Calorimeter constant (heat capacity) 8.57 kJ/°C 8.57 kJ/°C Initial temperature of calorimeter 24.30°C 26.40°C Fi…
Last reply by FChaosi_, -
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I-(aq) + HSO4-(aq) -> I2(aq) + SO2(g) How do you solve this? I just learned this, but if they are both - charge on the left, how can one be oxidized and the other reduced if they are both 0 oxidation states on the right? WHAT AM I MISSING? They should be 0 on both sides right.. can someone solve this and explain it? I don't really get it. tHANKS
Last reply by Msj Chem, -
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- 620 views
I'm thinking of doing my IA on the effects of ripeness on the concentration of vitamin C of a fruit (apple, banana, orange etc) Is this topic suitable for HL chem?
Last reply by fairyflaunt, -
- 8 replies
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Hi guys, I am a student in Year 12, just finished my term 1 of year 12 I have got a chemistry exam for the first time but the result is really horrible( probably 30~40%, the school average is about 60% and this exam is 35% of semester 1 grade) I really worry about keep doing chemistry HL and the unit I took was just stoichiometry which is easier than other units(I heard that) For people experienced chemistry HL, do you guys think I need to change subjects? I am not that passionate about chemistry but I could not confirm my career so I am going to take 2 sciences better than 2 social sciences(likely to go science…
Last reply by Avik, -
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- 572 views
I can't seem to remember them well and have this information stay in my mind for prolonged periods of time!
Last reply by kw0573, -
- 5 replies
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Hello! I am an IB Year 1 student, and I am aiming to pursue either Mechanical or Electrical Engineering. As of now my subjects are HL Math, Physics, Chemistry and SL Spanish ab initio, Economics, and English LangLit. I was wondering if it is possible to either drop chemistry and replace it with computer science HL, or make chemistry an SL subject, and make Economics an HL subject. How would this affect my application for top universities? Would they prefer HL chemistry for what I want to do? Or is it perfectly fine if I make it SL, or change it with Computer Science HL? Another question would be, IF it is perfectly fine to take computer science i…
Last reply by kw0573, -
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I have some questions from paper 1. 1. the first one is about first order reaction. I thought the answer was D, but the mark scheme says it is C. I thought C was for second order reactions... anyone can explain why the answer is C? 2. I don't quite understand conjugate acid-base pairs. I thought they have difference of 1 H atom. The answer is D, everything's correct. Please help by explaining... 3. I thought those results are precise, close to each other, and accurate, close to actual value... isn't it? which value should we consider when determining precision and accuracy? answer is B 4. I have no idea how to get the answer for this one.…
Last reply by allthebest, -
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Hey guys I need some help in deciding my chem ee. I was planning on doing water analysis, and I was going to determine the concentrations of different ions present in samples of water taken from where I live. My teacher said that it is a good topic because I'll get enough data to ananlyze. But I was wondering if I should just stick to one ion, or if I should do more than 1 ion. Any suggestions from anyone who's done an EE in chemistry? Any advice will be appreciated. Thanks! (The only reason I'm including this here is that I'm sure you chemistry guys can help me out better)
Last reply by kw0573, -
URGENT
by Guest Ahned- 0 replies
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How to calculate the amount of iron in an unknown aspirin solution when I have the absorbance of light value of Iron and the aspirin solution with iron??
