Chemistry
For Chemistry Discussions
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Hi, I'm stuck on what idea to do for my chemistry IA, so I'm wondering whether you guys could help . I'm thinking of doing an acid-base/equilibrium IA, but I have no idea where I want to go from there. This can change though if there are any better ideas!
Last reply by Amberrose248, -
- 3 replies
- 2k views
Hi guys, Please help! So I have a few topics in mind but I don't know if they are suitable for IAs They are : 1.Determine the ph and concentration of acetic acid in Silver Swan vinegar using acid-base titration.(I don't know the independent variable though. also can I just look for concentration or ph for the IA instead of both?) 2.Does the concentration of Monosodium Glutamate affect waters boiling point? Thank you very much!!!!!!
Last reply by kw0573, -
Chemistry IA
by Guest Ahned- 1 reply
- 437 views
How can FeCl3 be used in determining the synthesised Aspirin purity?
Last reply by kw0573, -
Chemistry IA
by Guest Ahned- 1 reply
- 533 views
What makes a certain Catalyst better than the others? For instance, what makes sulfuric acid a better catalyst when synthesizing acetylsalicylic acid than other catalysts?
Last reply by kw0573, -
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- 500 views
Hey My Chemistry outline was due last week and we had to find a topic or a question to investigate by then i found a question but my teacher told me its most likely not going to work and she also told me i could maybe investigate milk that has been sitting outside for a while and normal milk but i don't understand what she meant by that can i continue with my question and what would my hypothesis be? please help. This is my question... Compare the PH levels of whole,Skimmed and powdered MIlk Over time in a room temperature Environment and analyse the effect of the components of milk in a correspondent to its shell life?
Last reply by Msj Chem, -
Chemistry IA
by Rik- 2 replies
- 775 views
Hey guys! I'm kinda confused about IAs. My teachers all told me that IAs should have a hard topic to discuss. It shouldn't be something easily found on the internet either. As much as possible, they told me I have to do an IA that hasn't been done before. So I searched for a few Chemistry IAs to get some inspiration.. But then most of the samples I found had pretty simple procedures. Is that because their just samples? Or can I actually have a simple and plain topic? P.S. My HLs are Math, Chemistry and Biology and if anyone can give me tips on how to write these IAs, that would be really helpful! Thanks
Last reply by Msj Chem, -
- 1 reply
- 503 views
I don't really know if this topic would fit into chemistry. If so, then how would i investigate it, and what would I investigate. Suggestions or improvements? sidenote: Doing chem for EE, and also don't have a topic for that, so could this be more suitable for an EE?
Last reply by kw0573, -
Chemistry IA
by GGy- 1 reply
- 518 views
I'm in my second IB year and I'm still looking for a chemistry topic to do my IA about. Do I have to make up my own topic or can I just get it online? Also, does it matter if it was done before?
Last reply by Msj Chem, -
- 2 replies
- 438 views
I'm in IB1 and looking for a tutor, not regular for now, probably regular next year. I'm doing HL chemistry and want to excel at it, +my teacher barely knows how to balance a simple equasion Can you guys recommend anyone? preferably not too expensive Thanks, Antonia
Last reply by IB`NOT`ez, -
- 3 replies
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Hey Everyone, Just wanted to check whether we are required to know the Haber and Contact processes for the new IB Chem syllabus Thanks!
Last reply by IB`NOT`ez, -
- 1 reply
- 441 views
I'm doing my IA on decreasing the amount of water in fruits by dehydration and measure does it affects the energy released when undergo combustion. I need some help is this experiment achievable and as the water decrease the energy also decrease right?
Last reply by kw0573, -
- 0 replies
- 502 views
Help! My chem ee topic is as follows: esterification of a ester? What all methods can i include....tips...samples......procedure........methodology...etc. TYSM
Last reply by Jith1999, -
- 3 replies
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esters is one of the most common topic for a chemistry IA, The thing i am interested in this is the hydrolysis of esters, means the cleavage of chemical bonds by the addition of water. any ideas how to modify this ????
Last reply by mrwengchemistry, -
- 3 replies
- 864 views
So right now I have on idea for it and its to investigate the decomposition of Vitamin C under different thermal conditions. Apparently this is like one of the most popular choices and my teacher said if I want a good mark then I would have to put a unique twist into it. Any ideas, suggestions, or even different research topics/questions will be so greatly appreciated. Thanks!
Last reply by Monica Tujur, -
- 0 replies
- 516 views
Ok, so I'm doing my chemistry IA and I'm not really sure the level I need? I'm feeling like I have a really generic question at the moment. my question at the moment is 'How does increasing temperature affect the equilibrium constant in an esterification reaction?'. As far as I can tell its been done probably a lot before, but I've already done quite a bit of work on it and would like any suggestions on how to complicate it, or make it more unique? I was basically just hoping to get any advice/feedback. Thanks!
Last reply by Thisnotgood, -
- 1 reply
- 491 views
The answer is B; Can you fully explain the question and how it is solved, thanks!
Last reply by kw0573, -
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- 445 views
As the title says, I was wondering if my IA is appropriate. My research question would be something along the lines of: How does temperature affect the rate of reaction between sodium bicarbonate and acetic acid. My process for this would be measuring the gas produced via a gas pressure sensor (I believe these measure volume of gas produced as well, if I'm wrong please correct me - although I think I can calculate volume with just pressure as well). Once I have a rate, I can further my analysis by graphing the activation energy. However, I have a few worries. 1. Is this lab too simple? 2. Should I rephrase my question so it relates to activation energy? 3. …
Last reply by Avenoir, -
- 2 replies
- 11.5k views
Hi, I'm really confused as to how the rate of reaction can be measured from an absorbance vs time graph. I've thought about the following methods: -Half life concentration -Initial Rates method -Beer Lambert Law to determine concentration (?) For the first one, I can't measure half life concentration as the graph is one of absorbance vs time. I'm also not sure how to do Initial Rates method with LoggerPro as supposedly I take the slope at T roughly equaling 0.1s, however it gives me a super tiny negative value like 0.05*10 to the power of -0.05. Then I thought about using the Beer Lambert Law to determine the initial concentration based on isolati…
Last reply by IB`NOT`ez, -
- 3 replies
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Hello! So I know this question seems a bit early as I've only been in the IB for about a week now. So I'm taking HL Chemistry and so far my teacher / other students / the internet has managed to scare me about it hahah. The thing is, I really love the sciences, physics is my absolute passion so even though I know that HL Physics is hard I am willing to work for it, and the same goes for Maths as I need it to get into uni in the UK. Science has always been my thing (I got an A*A* in the IGCSE coordinated science in case that's relevant) but I'm starting to feel like I might not be able to make it in HL Chemistry as I rly took it because I'm "good" at it, and not …
Last reply by IB`NOT`ez, -
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I attached the questions in the images below. I think the answers are wrong. Are they correct or am I correct? My answers: 1. B 2 2. A A:1, B:1 3. A A:1, B:1 The answer from the pdf: 1. D 2. D 3. B I'm confused because of their answers since it's different from what I learned. Please help me clarify Thank you in advance
Last reply by kw0573, -
- 2 replies
- 528 views
I don't quite understand how to find the rate constant when the information given is as follows: Composition by volume of mixture / cm3 Initial rate Experiment 1.00 mol dm–3 CH3COCH3(aq) Water 1.00 mol dm–3 H+(aq) 5.00 × 10–3 mol dm–3 I2 in KI / mol dm–3 s–1 1 10.0 60.0 10.0 20.0 4.9…
Last reply by allthebest, -
- 2 replies
- 723 views
Hi, I'm currently doing an Chemistry IA and I'm wondering if it is okay to replicate the procedure of other's experiment (I found on it on Youtube)
Last reply by HCl227, -
- 3 replies
- 478 views
Hello! I've been working on my EE lately and it's on the effect of different gases like Carbon monoxide, Carbon Diooxide, Air, Oxygen, nitrogen on the absorbance properties of a hemoglobin solution. I plan to buy lyophilised hemoglobin online. I've also read the safety concerts about the EE and that it doesn't allow bodily fluids. Will my EE topic be red flagged even though lyophilised hemoglobin has almost 0 risk of infecting someone? Hemoglobin: http://www.sigmaaldrich.com/catalog/product/sigma/h7379?lang=en®ion=US EE guide/safety book. https://www.asparis.org/uploaded/Upper_School/key_documents/EEGuide.pdf
Last reply by kw0573, -
- 3 replies
- 2.2k views
So, I have somewhat an idea of what id like to do involving my chemistry IA but I'm in need of an opinion and or suggestions. My idea is an experiment testing the affects of Carbonic acid (due to ocean acidification) on shelled organisms and others that use calcium carbonate. Perhaps testing at which concentration it is harmful? or even the effects of acidity on shells? I dont have a specific or elaborate idea and am struggling to think of one all i know is that this topic is important to me and the world itself. All suggestions welcome please!
Last reply by blackblob, -
- 4 replies
- 694 views
For the reaction (delta)G = -RTlnK, assuming we use R = 8.314 JK and in order to find (delta)G in kjmol, do we need to divide whatever we get by 1000? Also, does the following equation work for the reaction of P4O10 with water? P4O10 + 2H2O -> 4HPO3 Additionally, in the Ideal Gas Law pV=nRT to determine Volume in cm3 under STP conditions: P = 1.01 x 10^5 Pa K = 298 R = 8.314 Is the above correct to find Volume in cm3 without multiplying or dividing more stuff?
Last reply by IB`NOT`ez, -
- 4 replies
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I'm having a lot of trouble with calculating activation energy from gradient = -Ea/R Linked to this post is the graph for temperature & ln k. The question is: Determine the activation energy, Ea , correct to three significant figures and state its units. [3] Taking the 2nd and 3rd points (from the very top) for gradient, I calculated (-6.20-(-6.70))/(3.22-3.30) = -Ea/8.314 However in the mark scheme, the gradient is supposed to be what I have calculated, multiplied by a 10^3 (thousand). Where did this thousand come from -- I see there's a 10^-3 on the x-axis, but I'm at a loss as to how I can arrive at the gradi…
Last reply by Msj Chem, -
- 1 reply
- 536 views
So I used 1 Mole of HCl, which came in a bottle. I used 20 mL of that. I made 0.75 moles of it by using 15 ml of HCl and 5 ml of water etc till 0.25 moles How do I work out the concentration of it? in mol.dm-3 I did mol/vol which was 1/0.02 = 50?!?!? im so confused please help
Last reply by mrwengchemistry, -
- 1 reply
- 579 views
I want my IA to be on fats, especially unsaturated fats i dont know how to proceed, i want to compare the unsaturated fats with the rate of evaporation as it is easy to find using logger pro, this wont be enough as this will fetch me very less marks any ideas, that i can include please show up.
Last reply by mrwengchemistry, -
- 5 replies
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I'm really confused as to why there are two different kJ/mol values in Section 12 of the Data Booklet (see pic attached) Usually I use the kJ/mol values from the first section and it comes out correct, but so what's the second one for? The 3rd section are entropy values right? Also, this is probably a really dumb question, but I still get confused from time to time with questions asking enthalpy changes. What I think is correct: Bond enthalpy = Reactants - Products Enthalpy change of formation = Products - Reactants Combustion = Reactants - Products Enthalpy change = Products - reactants (?) Would really appreciate any clarificati…
Last reply by kw0573, -
- 4 replies
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Hi, For months now, I still can't deduce the answer to this question and with a reexamination coming soon, I'd really appreciate any help anyone can provide. The question, which is from the 2016 Chemistry Specimen Paper, and is attached as an image to this post. The answer is 22.10cm^3, but I can't derive the answer from anywhere. With the question asking to "calculate", I've done a manner of different things from averaging the titre values, doing M1V1 = M2V2, just subtracting the second titre from the first titre -- but I still don't understand how the answer is derived. The markscheme says something like (hate the new mark scheme format so much as it…
Last reply by IB`NOT`ez, -
- 1 reply
- 707 views
I'm just on my second week of IB and I'm stressing over what I'd do for my IA in Chem, Physics and Math. Any ideas?
Last reply by mrwengchemistry, -
- 6 replies
- 1.4k views
For part (c) I got 335 J K^- mol^- which is correct according to the mark scheme, however when I tried to see if I get the same answer when using the standard entropy values (products minus reactants) provided in the table I get 70.8 J K^-1 mol^- which is a completely different answer, why is that so?
Last reply by kw0573, -
- 4 replies
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This question about the Born Haber Cycle is rather confusing, hoping someone can help. ii) Use the data in the following table and from the data booklet to construct the Born-Haber cycle for sodium chloride, NaCl, and determine the lattice enthalpy of NaCl(s). Na(s) + Cl2(g) → NaCl(g) ∆H = –411 kJ mol–1 <---- (I'm assuming this is the enthalpy change for formation) Na(s) → Na(g) ∆H = +108 kJ mol–1 <------ (I'm assuming this is the atomization for Na value) (Note: There is no other information from earlier in this question; this is all that's given) So after using the data booklet, I got the ∆H(ionization energy) for Na, which …
Last reply by IB`NOT`ez, -
- 3 replies
- 498 views
Is the entropy of the system the same as the entropy of the reaction?
Last reply by Msj Chem, -
- 3 replies
- 606 views
Can someone please explain the question and how you find the solution, the question and answer are below attached below: Thanks!
Last reply by kw0573, -
- 2 replies
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I am a second year IB student, and it's time I start working on my IAs. I need to choose a topic for my Chemistry (SL) IA, but I can't seem to find any that may interest. Out of all the topics, I like Rates of Reaction the best. So can anyone please suggest some topics for the IA related to Rates of Reactions? Thank you!
Last reply by mrwengchemistry, -
- 5 replies
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1. Curve X on the graph below shows the volume of oxygen formed during the catalytic decomposition of a 1.0 mol dm–3 solution of hydrogen peroxide. 2H2O2(aq) → O2(g) + 2H2O(l) Which change would produce the curve Y? (picture attached) A. Adding water B. Adding some 0.1 mol dm–3 hydrogen peroxide solution C. Using a different catalyst D. Lowering the temperature Why is the answer B? I thought it was A since if we put more water, concentration of hydrogen peroxide will decrease? and if we add more hydrogen peroxide, shouldn't the rate increase since there are more of th…
Last reply by allthebest, -
- 2 replies
- 477 views
I am fully aware that that the spontaneity of a reaction when both the signs of the enthalpy change and the change in entropy of the system are equal is dependent on the temperature whether it's high or low, how am I supposed to know what's considered a high temperature and a low temperature. Is there a universal standard? or will it be significantly high or significantly low in the exam for me to distinguish. Thanks!
Last reply by Msj Chem, -
- 1 reply
- 579 views
Can someone help me? I'm trying to find the theoretical value of the solubility of NaOH in 10 ˚C . I can't find it anywhere though :/
Last reply by Msj Chem, -
- 2 replies
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I am having difficulties while answering these question. 1. The equilibrium between nitrogen dioxide, NO2, and dinitrogen tetroxide, N2O4, is shown below. 2NO2(g) (reversible sign) N2O4(g) Kc = 0.01 What happens when the volume of a mixture at equilibrium is decreased at a constant temperature? I. The value of Kc increases II. More N2O4 is formed III. The ratio of [NO2]/[N2O4] decreases A. I and II only B. I and III only C. II and III only D. I, II and III The answer is C. Please help me by …
Last reply by allthebest, -
- 2 replies
- 630 views
So for my chem IA, I determined if varying temperatures affect the solubility of NaOH. I've written up my report but I didn't add any calculation for the errors or anything like that. Will I lose marks on that? If so, how much marks will be taken off?
Last reply by mrwengchemistry, -
- 5 replies
- 2.9k views
These questions are from the Spanish Chemistry HL 2016 paper one exam, I would appreciate it if you could help me understand them: This question translates to: Which is correct for an isolated system in equilibrium? First column is Gibbs free energy and second is Entropy. Maxima = Maximum Minima = Minimum ------------------------------- The issue I have with this problem is that I only know the relationship between Gibbs free energy and equilibrium, I wasn't taught equilibrium's relationship with entropy however. This question translates to: Which are the signs of changes in entropy associated with reaction The first column is the …
Last reply by kw0573, -
- 8 replies
- 1.4k views
Hey there! This year being my final year of IB, I'm going to be taking HL Organic Chemistry and always hear that Organic Chemistry is the hardest topic out of all the 11 topics, so for all of you who have taken organic chemistry or maybe have even taught it, what topics should I revise and focus on before the beginning of the school year so I can excel at Organic chemistry? Thanks!
Last reply by mrwengchemistry, -
- 8 replies
- 6k views
Hey I am really stuck for my Chem IA. I am doing vitamin c content in lemon juice and how it is affected by temperature and the thing is I have no idea how to calculate what the vitamin C content is in the juice. I have done the experiment whereby I titrated it all with an iodine solution and starch indicator and so on, I just don't know how to get the number which tells me what the vitamin c content is so I can compare between the heated samples. Right now all I have is some numbers saying how much iodine solution was needed to titrate it until a blue colour appeared, which does not really help. So if anyone knows please tell me!!!
Last reply by IB_taking_over, -
- 4 replies
- 3.2k views
Basically, when fingerprints are deposited in the crime scene, they have lots of oils and amino acids deposited on them. All these substances are polar. So that means they will respond to microwav.Many crime scenes are exposed to heat, because of gunshots, explosions or arson related incidents. In my IA, I will analyse the fingerprint before it has been exposed to heat and also after it has been exposed to heat. Then, I will see the difference in the fingerprint investigation due to thermal exposure. Results will be useful in forensic investigations.My RQ, therefore, will be - “Do the fingerprint residual amino acids alter in structure upon thermal exposure, causing a dif…
Last reply by Daksh, -
IA
by allthebest- 3 replies
- 900 views
As the syllabus changed, the IA criteria also changed. My teacher focuses on the personal engagement and says that it should be actual usefulness in daily life, not just doing chemical experiments. It is really difficult for me to connect, therefore coming up with a topic is stressful. Is it true that the IA should be connected to us personally? Thanks
Last reply by kw0573, -
- 1 reply
- 947 views
Ok so as the title implies, I am confused as to exactly what defines a chemistry IA. Recently my Teacher has got me started thinking about EE topics, but because my EE plans are mostly for bio, i decided to reserve the EE Chem ideas for my IA instead. What I am thinking of doing is measuring glutamate concentration in tomatoes after drying, HOWEVER I also know this sounds very biology. I have asked many chem/bio and chem/physics students about the defining lines of chemistry and the most I have gotten is "if you titrate it its chemistry :P" but obviously this is not the case. So I checked on the official chemistry IA website, and I found somebody doing and IA o…
Last reply by mrwengchemistry, -
- 6 replies
- 6.4k views
So my chem IA is about the ideal gas law, PV=nRT. While I needed to keep 'n' value constant, I failed to do so due to limited school equipment. As a result, neither increasing nor decreasing trend couldn't be found in the data collected. You know what I mean? so like for example, as the temperature increases, pressure should increase, right? but some part of the data agrees with the theory, while others do not, like this: Volume Pressure 10 100 20 93 30 95 40 101 50 96 (this data is fabricated to illustrate what I mean ) Is it okay to have completely scre…
Last reply by Flowing_Away, -
- 2 replies
- 658 views
I don't quite get how to make a rate equation/expression by seeing the mechanisms/ steps The overall reaction is given, and the step 1 and step 2 with slow and fast are given. I know that the rate expression should be made from the slow step (rate-determining step). But sometimes the reactants in the rate-determining step is not the same with the reactants in the overall reaction. Also, I'm quite confused with the order. Should I just follow like if the rate-determining step is P+Q --> X, then rate= [P][Q] because there is 1 P and 1 Q even though the overall reaction is 2P + Q --> R + S?? Please help me clarify... If you don't get what I'm saying…
Last reply by Professional student, -
- 1 reply
- 435 views
Hi, I'm doing my extended essay on Chemistry and what I'm worried about is my research question. I've changed it several times already and I can't seem to find what I like. Currently, I'm investigating catalysis but I don't think my extended essay has much scope in real life.How much of the extended essay depends on the research question,does the essay have to have real world applications and where can I find new research questions? Thanks so much
Last reply by kw0573,
