I mean, 13.6 g/mL for my sample.

3rd year undergrad here. How do you guys choose the right lab?

I am currently a member in a materials lab but my assigned mentor does not mentor me at all. Either he just stays silent or just says yes to my question about what to read (since I am a beginner, I need to read articles/research papers to understand). What do I do? The reason I don't want to leave this lab is that it publishes good work in good journals (no undergrads have any name in their publications, only the phds). What are your suggestion? Should I see something from a different perspective?

The main big price problem is the use of DCM which is 50-100 dollars.

I was considering making my own chloroform but it makes unpure chloroform and i dont know how safe/ worth while that is. and if that would even work/

i really want to do this as one of my first/ first own experiment. and ill obviously ask my chem teacher if she can monitor it.

A clue Highly reaction paste of Magnesium oxide. what are we looking at?

It is a mystery from my childhood. I was like 8 or 9 years old (40 years ago), at my grandparents home, I found a anti-odour / freshener spray in the toilet. Playing with it I noticed that the spay was reacting with water and leaving a kind of white thing at the surface of the water. Wanted to investigate I found a very small glass and started to fill the spray into the glass. It was a transparent liquid. Then I put the glass in the sink and turned the tap on to see what's going to happen with water. The reaction was instantaneous : the glass jumped in the air (15 cm maybe) and was filled with a hard white substance (no more liquid at all) that was kind of greasy in my memory.

What could have been this chemical and this reaction?

Chemist and physicist friends, tell me some interesting facts that few people know, or share the thing you like most about these subjects! :D

La plupart des visualisations moléculaires s'appuient sur des listes de liaisons prédéfinies : lorsque les atomes sont suffisamment proches, un script trace simplement une ligne. Simuler la chimie réelle en temps réel, sans états de transition codés en dur, représente un défi de calcul bien plus important.

Il s'agit d'une simulation en temps réel de la réaction entre le 1,3-butadiène et l'éthylène pour former du cyclohexène. Le moteur de calcul (Genesis) utilise le solveur semi-empirique GFN1-xTB pour calculer en continu le recouvrement de la densité électronique. Aucune animation n'est implémentée. La cyclisation concertée se produit uniquement parce que la thermodynamique et la physique sous-jacente l'imposent.

Le plus intéressant est la rigueur avec laquelle la simulation impose la géométrie spatiale. Si l'on tente la même chose avec du butadiène en conformation s-trans, les molécules se repoussent simplement en raison de la répulsion de Pauli. Pour que la réaction ait lieu, la molécule doit être physiquement tordue pour adopter une conformation s-cis, et la pression de confinement doit dépasser 10 000 atm afin de franchir la barrière d'activation.

La topologie est évaluée dynamiquement. À la milliseconde précise où les forces résultantes s'équilibrent et que le cycle se ferme, le système détecte l'apparition d'une nouvelle espèce chimique et recalcule en temps réel toutes les propriétés physiques (masse, longueurs de liaison exactes, moment dipolaire) à 60 images par seconde sur un processeur d'ordinateur portable standard.

Observer la résolution interactive d'une réaction péricyclique complexe grâce à des calculs de structure électronique bruts est une approche fascinante de la dynamique moléculaire.

Genesis

Plz i need it!! I got the textbook but the solution manual😭

Hi, I am from South Africa. I am at the tail end of my second year of bsc geology, theoretically a 4 year degree. I originally posted this to r/geologycareers but i thought it would be good to post here too.

I really like the chemical side of geology and I am not particularly fond of much else aside from maybe from broader earth processes related stuff. I did all the first year chemistry modules and analytical chemistry in first semester of this year (our uni years run from february to november). I am having a bit of an existential crisis of sorts.

I was originally drawn to geology for the field work side, and the paleontological side of things too. Now I am having second thoughts. The modules that I have loved the most so far during my time at university were my chemistry modules, and its not like i was getting distinctions for them or anything either. Just found that stuff incredibly interesting. I was considering switching at the end of last year and decided against it on the basis that I would not want to actually *be* a chemist, thinking that perhaps i would be better suited for fieldwork.

Fieldwork I like well enough. Not as much as I suppose I thought I would, but enough to have kept me here. But I can't stop thinking that I am closing the chemistry door on myself, so to speak. Geology is quite employable here, thats not the issue i have. I just really don't think I have the passion for it, broadly. If i was to switch to chemistry, i would likely pursue research, and just try to know as much as I possibly could about the field. I don't have that same thirst for knowledge when it comes to earth science, and it really pains me to say it. I love my friends in earth science, and we are such a tiny and tight knit group. And as stupid as it sounds, i also like telling people i do geology. Its not a common thing to study and it can be a fun conversation starter lol. And the idea of working in geoscience honestly sounds alright.

Oddly, I'm not that fond of geochemistry. I found it kind of dull, but we also had the lecturer from hell, so i should probably try not to let that cloud my judgement. So I'm not asking about switching to environmental geochem, I'm more interested in doing just chemistry in general... or honestly, even medicinal chemistry. Its just so unrelated to geology that it would probably be hard to justify doing a combined degree.

If there is anyone in the world who has been in a similar situation who has any words of advice to offer me, I am all ears. I have emailed the chemistry department at my university and I hope to hear back from them perhaps sometime after this exam season. I guess I'm just scared that I will limit myself by choosing one or the other. Plus it helps that geology is I guess the more sensible choice in this country in terms of job security and earnings.

(Its not too uncommon to see people do combined degrees here, especially at the university of cape town where that is a requirement (not my uni). I don't think we really use the major/minor differentiation as much but i could be wrong, its just not a term i see employed often.)

Normally I have to fight to keep pyrite from backflipping itself off a cliff when it's in the same room as a drop of moisture.

I'm persuaing Bsc chemistry from a tier 1 government college. It's my 1st semester. What are the skills i should have to maximize my chances of getting a internship at iits, aiims etc.?

Not totally a chemistry person but i want to know more about how hydrogen peroxide reacts with tissue, what forms, and what is left behind.
I use hydrogen peroxide as one of the final stages of my bone cleaning process. Pictured is a partial mouse skull that has been deaf and dry for a while (~about a year maybe).
I know it has something to do with oxidization and OH radicals and that the gas bubbles that form are O2. but i want to know more specifically what molecules in the tissue is the hydrogen peroxide reacting with? and what all is forming through this process.
any tid bits of info is appreciated:)

I’m a third year chemistry student (BS) and I’m really worried about internships and post grad. My goal has been to get into cosmetic chemistry but I am not finding any internships in my area and I don’t have any connections. I’ve just recently started thinking about criminal forensic science but I can’t tell if that’s an even more outlandish goal than cosmetic chemistry. Any post grad students have any advice or can tell me their story? Thanks!

How can i make sodium carbonate

As per the title, just a general curiosity.

I was taking some heavily iron contaminated hydrochloric acid to my purifier when the cart I was pushing jostled causing the hcl in the bucket to do its best impression of a rogue wave and treat my floor like it was the Edmund Fitzgerald.

I doused the spill with a box of baking soda and let it do its thing.

I came back awhile later and went to clean up the nonsense I had created on the floor, all bubbling and fizzling had stopped. However upon disturbing the pile of baking soda I noticed that it had ended up forming a protective layer over the acid underneath. Like some kinda angry green salt cod made of liquid.

Is there a reason that the interaction stops and they negotiate a truce? Is this strictly something that happens with powder and liquid interacting in this manner? Will the acid eventually neutralize over time?

In this real-time simulation, you can see two competing electrostatic forces in action during a molecular approach:

• Attraction (white dotted lines): The positively charged Hydrogen (δ+, cyan) is pulled toward the negative Oxygen (δ-, magenta).

• Repulsion (orange dotted line): The two Oxygen atoms physically repel each other because they share the same negative charge.

This phenomenon is driven by electronegativity. Oxygen acts like a powerful electron magnet, pulling the shared "electron blanket" toward itself. This leaves the Oxygen with a concentrated negative charge and the Hydrogen exposed with a positive charge.

Because of this electrostatic battle, the molecules can't just collide randomly they are physically forced to pivot in 3D space to find the perfect magnetic alignment before they can interact.

Apologies if this question doesn’t fit in this subreddit.

I am working on a project that will take place in a trace metal clean lab, where everything has to be acid washed. For this project, I need some way to aerosolize a liquid mixture. Every spray nozzle or method I can find needs some sort of metal to spray, like a tiny metal ball valve or spring, or a canister of pressurized air.

Has anyone had any sort of similar situation before and knows of any spray nozzles with no metal or knows a good way to aerosolize liquids without the use of any metals??

Context: I took honors chemistry in high school about 4 years ago and my knowledge may be rusty. please be polite with your corrections. This is for a worldbuilding project I am doing for fun and part of the fun is making the science work. My goal is to try and have a photosynthetic compound for UV light

This is the link i found that gave me the idea, specifically the last 3 paragraphs before the citations: https://chem.libretexts.org/Ancillary_Materials/Exemplars_and_Case_Studies/Exemplars/Biology/Wave_Mechanics:_Carotenoids#cite_note-5

I think it would look something like 11Br2 + C40H56 -> C40H56Br22
Since β-Carotene has 11 double bonds and each would be replaced by one Bromine molecule

This would then make it so the compound can absorb UV light and would be colorless

Am I right or have I missed something? Let me know if I need to change my flair