/r/chemistry

Photograph via snooOG

A community for chemists and those who love chemistry

Rules: Violating a rule will result in a ban.

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Notes:

  • If you're looking for a more concentrated, advanced discussion of chemistry topics among professionals and grad students, check out /r/Chempros.

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Past Weekly Topics

/r/chemistry

2,099,634 Subscribers

1

Is chloromethyl more carcinogenic than formaldehyde alone ?

I've heard that chloromethyl was more carcinogenic than formaldehyde by itself, but I'm reading some articles online that are saying that mixing hydrochloride acid and formaldehyde doesn't increase the carcinogenic affects. This is an example of what I've read online https://pubmed.ncbi.nlm.nih.gov/4082190/

0 Comments
2023/09/26
18:51 UTC

1

What is an alpha particle?!

Im so confused, pretend like youre explaining it to a child. I know so far that its like a hydrogen bond but with 2X the charge so it has two electrons and 2 neutrons, but im still so confused. Why is it only compared to a hydrogen as well? Whats so special about a hydrogen?

0 Comments
2023/09/26
18:45 UTC

4

Friedel-Craft Acylation to start off the day 🥱

3 Comments
2023/09/26
18:13 UTC

2

Jobs in super-dangerous synthesis?

After manufacturing API's that actively want to kill me and handling pyrophorics that want oxygen more than me, I've gained a certain satisfaction with working with these hazardous materials. Knowing that I'm operating with stuff that other people are unwilling/unable to handle safely gives me immense pride in my work. What companies can I apply for where I would be synthesizing/producing similarly dangerous stuff? Not sure how I feel about producing military-grade primary high explosives. (I live in the Northern Midwest of United States)

10 Comments
2023/09/26
18:12 UTC

1

Osmosis Vs. Diffusion

Would I be correct if I said that Osmosis is simply the transportation from area A to area B and diffusion is the process of solvent particles blending into a solute?

6 Comments
2023/09/26
17:37 UTC

0

What should I expect from DCM in tiny cuts on my fingers?

Basically, I always have tiny cuts on my cuticles, and I had to use dcm in cuvettes today without gloves. So it leaked out fo the cuvette, and it for sure made good contact with the cuts. Spilled probably 2 or 3 mL of it on my fingers over the lab. It burned about as badly as ethanol would have.

I'd look up the sds, but I don't think it has a section on injections. So has this happened to anyone else? What happened after? Should I see a doctor or am I overreacting?

16 Comments
2023/09/26
16:54 UTC

1

Trying to identify a chemical/mineral we use in our desiccator to absorb moisture?

It looks like a collection of blue pebbles that turn brown once they have absorbed a certain threshold of moisture. We put them in the oven when this happens, and they come out blue again. They are just a means of keeping the air in our desiccator less humid as we perform moisture analysis, but I am updating our SDS binder, and I'm not sure what they are exactly. Sadly, I'm not allowed to take any pictures but I'm happy to answer any questions. Thank you!!

2 Comments
2023/09/26
16:54 UTC

1

Heating NaOH at 250 C?

My group in lab did that because we wrongly thought it was part of the procedure. It was heated only for maybe a minute or two before our TA saw it and ceased the process. However, my throat does feel weird (it had been prior to the lab, but now it feels even more so) now. I am just noticing it more because of the incudent that occurred in lab, right? Is heating NaOH bad?

3 Comments
2023/09/26
16:52 UTC

0

Is there a calculator that predicts a chemical reaction's products?

I want to calculate the products of H2O2+KMnO4+KI ( Hydrogen Peroxide + Potassium Permanganate + Potassium Iodine ) before I start the experiment.

However, a chemical product calculator would be useful. So far, I haven't seen one that works. Do you guys know anything about a chemical reaction product calculator?

3 Comments
2023/09/26
16:34 UTC

1

Calculating lead carbonate?

From my research data I have pH values of my water samples, then have ICP-MS lead concentrations in ppb. How could I calculate the lead carbonate concentration? Is that possible with the carbonate solubility curves?

0 Comments
2023/09/26
16:31 UTC

1

For A) is there any more resonance then the going around the ring? And is fluorine the only possible lewis base? For B) are there 4 resonance structures? Or does the bottom one not work?

1 Comment
2023/09/26
16:23 UTC

0

How are chemicals generally created on an atomic level?

For example, if I had a bunch of hydrogen atoms and carbon atoms, and put them together, under what conditions would hydrocarbons be produced and which hydrocarbons, and why?

7 Comments
2023/09/26
16:11 UTC

1

Chemical analyst in uranium mining factory

I got contacted for a job in a uranium mining factory but before the interview they want me to have a test.

But I have no idea where to start or how should I prepare for it.

2 Comments
2023/09/26
16:00 UTC

0

Working as a biochemist in R&D

Hello everyone I need some advice becuase I am feeling quite nervous before starting my first job. For a little bit of info I have an undergraduate degree in chemistry and a master's in biochemistry both my undergrad and master's thesis / lab work was done in a biochem lab and it consisted mostly of classic biochem / molecular biology techniques, e.g PCR, molecular cloning, protein purification, bacterial and eukaryotic cell cultures etc. On October 2nd I will be starting my work as and R&D associate in a pharmaceutical company , it's going to be my first actual job as a chemist and I am feeling quite nervous mainly because from what I have seen in the lab it focuses on organic chemistry when it comes to synthesis so I am in need of any and all advice from people who have worked in a similar position. The good news is that both the company and the people working there have quite a good reputation and the pay is really good especially for where I live.

3 Comments
2023/09/26
15:58 UTC

1

BS in Chemistry Jobs in the DMV Area

Wassup y'all,

I hate to hop on here like this but I am really in a shit hole.

I'm going through literal hell trying to get a job in the STEM field, specifically chemistry. I'm located in the DC metro area and would love to get into something lucrative for my own physical and mental well-being. I've applied to several entry level jobs, internships are not as abundant as they used to be (or the timing is just off when they start them), and I'm barely getting callbacks or even emails. I'll get maybe 1-2 interviews a month.

I was employed at a resins manufacturing company about a year ago but I was laid off soon after (budget cuts) and it's been hard to find something stable since then. I have been tailoring my resume to get into a medical/clinical lab setting but again, unsuccessful.

The last thing I want to do is slip back into my career depression but I really don't know how else to move forward at this point.

STEM colleagues, how did y'all do it!? Anybody working in the STEM field has suggestions, tips or advice on getting my foot in the door I am all ears and it would be greatly appreciated.

5 Comments
2023/09/26
15:36 UTC

0

Gunpowder without potassium nitrate

Is it possible to use something other than potassium nitrate as an oxidizer in gunpowder? Or is there something else that acts like gunpowder and does not require potassium nitrate?

2 Comments
2023/09/26
15:05 UTC

1

Can anyone recommend some mid-level resource(s) for learning about atomic structure and bonding?

Many years ago, I graduated as a biochemist and even worked in the field for a few years before moving on to computing. But I left both maths and physical chemistry behind at age 18 and a lot of what I did know about both I've long forgotten.

Much as I loved biochemistry, I've also always been fascinated by the structure of the atom and atomic reactivity. Why are electrons arranged in shells and orbitals? Why are atoms more stable with a full outer complement of electrons? Why do they sometimes form ionic, and sometimes covalent, bonds? Why are some bonds stronger than others? That kind of thing. They don't cover that kind of detail in biochemistry, unsurprisingly as it's not directly relevant.

I'm helping my kids with their school chemistry at the moment, and teaching them about atomic structure has re-awakened by curiosity around the subject. Not least because they ask me some of these questions, and I can't answer them!

I've poked around online, but the trouble is that I can't find anything that's pitched at a good level for me. I understand all the basics perfectly well. But then there just seems to be a gap where it jumps straight into the details of quantum mechanics. I actually tried getting to grips with a textbook on quantum mechanics, but it rapidly because apparent that my grasp of *physics* wasn't anywhere near good enough for me to cope, let alone my maths. I know next to nothing about wave mechanics, for example.

It strikes me that the reason I can't find anything, is that it doesn't exist. That there simply isn't any meaningful way one can delve into the why's and wherefore's of atomic structure without doing the groundwork for quantum mechanics. I don't know if that's true, but if it isn't, can anyone recommend a book or article series that I might be able to get to grips with? And if it is true, are there any recommended resources I can use to try and make a start on the physics and maths that I need?

1 Comment
2023/09/26
14:51 UTC

2

Periodic table with additional information

0 Comments
2023/09/26
14:49 UTC

1

Does Anyone Know a Substance That Changes Color When Exposed To Oil?

I was wondering if anyone here knows of a substance that changes color from when it comes in contact with an oil.

It would be best if it could be aerosolized, sprayed on an area and then if it were to come into contact with oil would visibly change color.. Does anyone know of something like this?

7 Comments
2023/09/26
14:38 UTC

12

What made you fall in love with chemistry?

What are your childhood memories or incidents that made you love chemistry? What specific experiment or concept in chemistry first captured your interest? Can you recall a moment from your childhood when you realized the beauty of chemical reactions? How has your love for chemistry evolved as you've grown and learned more about it? Is there a particular branch of chemistry that you find most captivating, such as organic, inorganic, physical, or analytical chemistry? Have you ever applied your knowledge of chemistry to real-life situations or hobbies that you're passionate about?

21 Comments
2023/09/26
14:35 UTC

9

Why does vapour pressure not depend upon surface area?

My chemistry teacher Said that in a closed vessel at constant pressure the pressure exerted by vapour from a liquid will not depend upon area and only depends on temperature. Why is that? More surface area means more liquid to evaporate isn't it?

11 Comments
2023/09/26
14:28 UTC

33

Quenching PIDA after TEMPO oxidation gives me lava lamp vibe

Nothing very special or cool chemistry but maybe I am in the mood.

2 Comments
2023/09/26
13:45 UTC

1

Nernst Equation Usage

Hi! I'm doing an electrochemistry experiment and I am using the Nernst equation to analyze the results. The experiment is being done under non-standard conditions (my independent variable is temperature) and my Q value is 2. To model this situation using the equation, should I be using the standard cell potential for 25 celsius at each temperature, or should I use the standard cell potential for each temperature. If it is the latter, how could I determine it? I have read on other sources that standard cell potential is a function of temperature since the Gibbs free energy is a function of temperature. Thanks in advance!

0 Comments
2023/09/26
13:11 UTC

33

How do you treat sulphuric acid on skin?

We got sulfuric acid where i work, some of my colleagues say wipe it with something first, then rinse it with water Some say just go wash it

57 Comments
2023/09/26
12:38 UTC

0

What specs would a laptop need for Lab software

Hey! I’m looking for a laptop that can run topspin and origin for my lab analysis module and maybe chem draw! Anyone know what specs I should look for when buying a laptop

4 Comments
2023/09/26
12:24 UTC

5

Does HNO3 release H2 Gas when reacting with metal or no?

Through all of the lower grades, we were taught that HNO3 oxidizes all the produced H2 to H2O.

My current professor who has a PhD in Inorganic Chemistry says that HNO3 will never oxidize H2 gas to H2O.

I'm not sure which to believe. Is this a common controversy?

11 Comments
2023/09/26
11:43 UTC

48

Editors and scientific journals are reluctant to correct the scientific record; episode 999

In the context of the post-publication peer review initiative of the NanoBubbles project, we posted a detailed comment at PubPeer on Two-Photon Ratiometric Fluorescent Sensor Based on Specific Biomolecular Recognition for Selective and Sensitive Detection of Copper Ions in Live Cells; Analytical Chemistry (2013).

We also contacted the Editor-in-Chief because some of the findings were suggestive of image manipulation.

Like, for exemple, the same cell twice in the same field of view (pink squares).

https://preview.redd.it/ukucnjrxnkqb1.png?width=818&format=png&auto=webp&s=9a82dfde39ed4f99ee9182d3161828db7f041fa7

The Editor-in-Chief contacted the authors, who argued that there was no image manipulation. I am not authorised to reproduce their argument that, unfortunately, they have not posted at PubPeer. The editor found the explanation reasonable and closed the case.

I responded to the Editor-in-Chief the 17/08 (see here). I am yet to hear back.

6 Comments
2023/09/26
09:53 UTC

51

Why can't we taste air?

You need somthing to react with your tongue to taste right? So why can't we taste air or any gas?

58 Comments
2023/09/26
07:49 UTC

1

How can I generate formaldehyde vapor from formaldehyde 37% stabilized with methanol?

2 Comments
2023/09/26
07:42 UTC

1

Studt habit tips

Hello I am a bs chemistry student, can you suggest study habit techniques that I can do to learn better and faster. Additionally, can you suggest links or websites with chemistry related questions, I prefer something with answers and solutions so that I can practice solving problems, thank you

2 Comments
2023/09/26
07:08 UTC

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