I want to crystalize some copper 2 sulfate and use those crystals to make a necklace to my girlfriend. My question is could that necklace be harmful to her skin?

Hey there had a brief foray into fragrance making and I have 3 32 oz bottles of SDA 40b and about 100 4ml vials of aroma chemicals and essential oils I need to unload if anyone is local to the Bethlehem PA area and willing to pick up free of charge. I recently had a life event that requires me to stop with the hobby. I don't want to go through the trouble of shipping so local only.

This is probably unusual question. I want to surprise my dungeons and dragons players with some real chemical reactions. Sadly, I have no knowledge about those stuff and I am looking for some ideas/help. I also don't know what is possible, my idea is to make them 'brew an elixir' (of course they won't drink it), but I am open to other ideas.

I am looking for some reactions that (in this order):

• are safe in room (we can open a window etc)

• are safe when mixed incorrectly (it will be a puzzle).

• won't make too much mess (especially if it could damage something, e.g. table).

• ingredients are easily accessible/storable.

• shouldn't take too long to make

• look cool.

Optional properties:

• fake ingredients that will stop/change reaction from happening (failed puzzle).

I know it might be a bit of wishful thinking to find something like this, but maybe someone has some suggestions?

Why is this even an over the counter product? I mean isn't HF like really dangerous? Where i live i can't even buy sulfuric acid above 15% and i can't imagine this being much safer. Also would it actually work as a rust remover? And even if it did remove rust wouldn't it leave behind a patina of iron fluorides on the surface of the metal object discolouring it or would that not be an issue?

I'm honestly surprised this exists as a product at all given the reputation of HF (it is clearely imtended for domestic use) the bottle contains just 50ml which isn't a lot but i still can't imagine this being safe to handle

Was making some fizzy water with my Sodastream machine and wondering, when CO2 is "dissolved" in water, is it somehow physically trapped in a liquid phase in the water, or is it chemically dissolved in the water - bonded to the water molecules in a way that changes the structure of the water itself? I suppose that on some level a chemical process like this is just a physical or mechanical reaction anyway. . .

If you wash the clothes will the lead be removed? I have clothes in the house (tops and a few plastic bags etc)with two young kids that I want to remove. But wonder if I should just leave them there or use gloves or what the danger is

Do the clothes sitting next to them need to be thrown out also?

This story is from a couple years ago but I still don’t know what I did.

Set the scene I was bored in Spanish and got a small bottle of water with half a packet of kool aid in it ((I’m from the uk, tried it didn’t like it) And I just started asking around for people’s old stationary and shoved it into this bottle these things were highlighters pencils and stuff like that. I put it in my bag and forgot about it, and kept on forgetting about it until like 3 months later. I took it out and it was really hard, the pencils hadn’t rotted or anything, then one of my friends throws it on the ground and the bottle exploded… (and dented a teachers car but we don’t worry about that bit) What happened I need an awnser.

I found this product on Amazon for a period table with the real elements included (except for things like plutonium and Oganesson, obviously), and it had a piece of thallium in it. I was wondering, is this safe? How radioactive is thallium exactly, and will it harm me? https://www.amazon.com/Periodic-Elements-6x4-5x1inch-Decoration-Teaching/dp/B0BXSC2FYF/ref=asc_df_B0BXSC2FYF?tag=bngsmtphsnus-20&linkCode=df0&hvadid=80470624768999&hvnetw=s&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4584070164563577&psc=1   is the link to the product. Edit: Sorry everyone if I seemed annoying or unknowledgeable yesterday. I was sick from a virus and still not thinking clearly, I’m a lot better today. Kind of funny how I noticed things like osmium and thallium, instead of uranium and thorium, but even then that radiation is negligible. Thank you to all who responded.

I'm about to start my second year as an undergrad and am looking for a placement in computational chemistry for my third year. I know Python is essential, but should I learn other languages or just focus on chemistry-related Python packages?

I don't have a computer science background from A-Level or GCSE, so I don't really know how to stand out. I have a decent understanding of Python and working to improve it.

What else should I focus on, and how can I prove my skills when applying?

Hi, so I want learn about environmental chemistry, and I was hoping you guys would recommend some good books about this field, also what do you think about the book Environmental Chemistry: fundamentals by springer, since one of my friends recommended it.

Is doesn't have to be that pure

Sellafield Ltd would like to identify a fixative that securely fixes airborne alpha particles in place, along with an application method that can be deployed through a 150mm diameter glove port. The fixative solution must be chemically compatible with the glovebox materials, stable under ambient conditions and be as long-lasting as possible. Further details can be found in the “Functional Requirements” section of the challenge statement.

Due to the risks of a breach of containment posed by ageing gloveboxes, a solution is desired as soon as practicable. As operations at the Analytical Services Laboratory at Sellafield, which contains many alpha contaminated gloveboxes, are being phased out, this further exacerbates the need for a fixative solution. Other methodologies have been trialled; however, Sellafield Ltd is looking to improve upon these.

The ideal scenario would be the capability to coat a glovebox sufficiently for it to be transported without an outer box or crate. Treatment that enables an empty glovebox to act as a container for waste would be an added benefit. Due to the complex states of gloveboxes across site, and the resulting requirements on fixative technology, Sellafield Ltd understands this will be a challenge.

FIND OUT MORE

Please download the challenge statement for full details of this opportunity: https://www.gamechangers.technology/challenge/Fixatives_for_containment_of_alpha_contamination_in_gloveboxes

An interactive webinar will take place at 10:30am on Thursday 25th July 2024 where delegates will have the chance to hear directly from the challenge owners and ask any questions. Attendance is free - register here.

The deadline for applications for this challenge is 3pm on Thursday 15th August 2024. Selected Solutions will receive £10,000 for a 3 month feasibility study which then may lead to the project being funded as a Proof of Concept.

Hello all, I’m just wondering if I should be worried because the lightbulb in my microwave went out. Is that likely mercury and if so, how dangerous is it?

Going to not bury the lead here, I need a brain trust to tell me if/why I’m right or wrong here. I believe running a hydrocarbon standard (say pentane through heptadecane) on our GC/MS is a useful reference point, since we look for unknowns and the methods in NIST/Agilent libraries are not based on our methods or equipment.

Just a dumb bachelors level biology degree holder here. My masters is in Public Health. Short version is I work in hazmat response, and my counterparts come from all walks (microbio, chemistry (bachelors up to PhD), nuclear physics, etc). Just about any “hard science” bachelors on up can be a science officer on one of these teams.

In discussion with one of the few higher level guys, he couldn’t understand why I would want this programmatically (across all the states) for our lower level science guys. I get spectral analysis, and I’m okay at it. However, it’s not uncommon to get 2-3 far apart peaks for some really bad stuff on our runs depending how dirty the sample is, especially if we need to drop the match score to see anything at all.

Knowing something I’ve seen comes out at 1580, means I can slap a hydrocarbon backbone spectrum (run on my machine) on there and see which peak is closer to hexadecane. It’s not definitive, but it’s a reference tool like a yardstick adjusted to my machine specifically. Is he just missing the point, or am I horribly misapplying this? It wasn’t my original idea, I used the exact same thing when I originally learned GCMS.

Hi. I'm looking for someone who can perform an analysis of cetirizine dihydrochloride according to the European Pharmacopoeia. I'm particularly interested in the determination of related substances using HPLC. I would love to see a few spectra and ask for a consultation. Thanks in advance! Justine from Poland

Hi,

Consider a cube with 1 side of 5 meters. Total volume is 125 m^3. Imagine 3 balls with a mass of 1 kg and a speed of 10 m/s in this cube. 1 ball moves only in the x axis, 1 ball moves only in the y axis and 1 ball moves only in the z axis. Lets calculate force and pressure on this cube.

Fx = ΔP / Δt
ΔP = m Δv = 1kg (10-(-10))m/s = 20kg m/s

Δt = d/v = 2*5 m / 10m/s = 1 s

Fx = 20 Newton

Pressure = Fx/A = 20N / 25m^2

Pressure * Vol = Energy = (20N / 25m^2 ) * 125 m^3

Energy = 100 joule.

But we know that KE of 1 ball is 50 joule;

1 ball energy = (1/2) * 1kg * 100m^2/s^2 = 50 joule.

energy of 3 balls is 3*50 joule = 150 joule.

But when we multuplied pressure and vol we got 100 joule.

why is there a confliction?

it seems that (1/2)m(vrms)^2 is equals to KT, not 3/2 KT

I used catalase as the catalyst for the decomposition of hydrogen peroxide to find the activation energy, and I'm wondering why it would be in the rate law? Since it is a catalyst, I thought it wouldn't be considered a 'reactant' as it is not consumed.

I just completed my MSc In Organic Chemistry and I’m not interested in the laboratory part of chemistry. I’m good with computers, like to interact with people, likes managing stuff and also likes travelling. So can you guys suggest something because I’m so disoriented right now that I literally don’t know what steps to take next.

A job is something that I have to do for a lifetime so I believe it’s better to do what we are good at so that I can improve and also feel a passion in what I’m doing.

TLDR: Cheap and reliable multi-elemental Analysis in preferably aqueous soln. Devices, recommendations, experiences

Hello dear chemists!

I have the task to build a laboratory that will (besides other things) analyse smaples for their metal content. Standard approach would be ICP, but i am also open to other methods like AAS. We already have an XRF that i could use for that purpose, however i found this method to have several drawbacks (sample prep, measuring time, no measurment of light elements etc.) I already developed a method that works for XRF, but dont think it will allow for fast analysis of many samples. Before I continue to MacGyver around with the XRF i want to buy another Spectrometer like the ones mentioned above.

My boss i a cheaplord (or lady, to put it better) and yes, i know of labx or ebay, but I'd rather buy a new device. So I wanted to ask for your experiences with ICPs or AASs that are cheap and reliable. Can you recommend some? With AAS i would steictly prefer the ones that emit via a continous spectral radiation source since I'd need to measure a bunch of elements (at least 7 are of interest, different kinds).

So yeah, happy about your input and thanks in advance!

I have an integrated closet painted by alkyd enamel that is releasing a lot of different VOCs. I try not to go into that room and let it ventilated with open windows.

But can VOCs accumulate in other items in the room (furniture, clothes, wooden shelves, etc.) and do I have to move them to another place? Also, can offgassed VOCs sedate in food?

Thanks in advance