Chemistry

Hi everyone! I have talked with woelen about this and he thinks its a good idea so here goes. This thread is for chemistry links and information that could be useful to other people. Books and useful information are also welcome. Links from the forums: Reference: Collecting elements - Lots of information about buying and collecting elements. Hazardous Materials and Synths - Always read before posting something potentially dangerous. The periodic table - Lots of periodic table links. A latex tutorial - A lot of info on how to use Latex in the SFN forum software, nice for formulas, equations and so on. Making Things / Experiments: …

I was thinking ... why not make a thread where everyone can put great sites about the periodic table. Here are already some great sites. (**** = EXTREMELY GOOD, *** = VERY GOOD, ** = GOOD, * = NORMAL) **** http://www.vanderkrogt.net/elements/index.html Fantastic site !! You will find this site useful not only for the origins (etymology) of element names, but also for translations of each element name into numerous other languages. **** http://homepage.mac.com/dtrapp/Elements/mineral.html Origins of the element names. Very nice !!!! **** http://www.element-collection.com/index.html The Most Beautiful Periodic Table Displays in the World ! Great site for elem…

I've created a chemistry dictionary for use in Microsoft Word and OpenOffice.org Writer. It can be downloaded here: http://www.chemspy.com/chemistry-news/open-access-organic-dictionary.html Right now (2/11/08) it only has US spellings, but that is an update I am working on with priority. I hope this helps my fellow chemists. -AA

I've noticed a trend over the past few months in some of the newer members posting here and in some of the other board, which is that they appear to think that they have the right to information without anyone questioning what they plan to do with it. So I thought I would post this thread, which more or less reiterates some of the T&C as well as various member posts. Many of the people who answer questions in this forum are professionals, students at university/college/etc., or well informed hobbyists. As such, when people ask questions here, we have a responsibility to ensure we are not providing them information that could potentially lead to the production of …

The Basics (and a bit more) about element collecting So, you want to start your own collection of elements, the noble building blocks of the universe? Great! First you might want to define what sort you prefer; elements in their everyday use form (spark plugs, lightbulbs, nuclear reactors), perhaps minerals with interesting elements in them or pure (+99%) lab/reagent grade samples, or a mix of these. Some providers to get you started: Red Green and Blue Company’s Element Collection page, www.element-collection.com If you’re lazy, or just want to get a brilliant assortment of ALL naturally occurring elements straight from hydrogen (1) to uranium (92). RGB also…

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*Molecular movements* refer to the various ways molecules move, vibrate, or rotate, depending on their state of matter (solid, liquid, gas) and temperature. These movements are fundamental in understanding physical properties, chemical reactions, and diffusion. Types of Molecular Movements: 1. *Translational Motion* - Molecules move from one place to another in space. - Most noticeable in *gases*. - Example: Gas molecules spreading out in a room. 2. *Rotational Motion* - Molecules rotate around their axes. - Happens in *gases and liquids*. 3. *Vibrational Motion* - Atoms within a molecule oscillate (vibrate) around their equilibrium…

The term *“chemical activity”* refers to the *effective behavior of a substance in a mixture*, taking into account interactions between particles, rather than just its concentration. It’s commonly used in physical chemistry and thermodynamics. Simplified explanation: - In ideal solutions, *activity ≈ concentration*. - In real solutions, due to interactions between molecules or ions, *activity ≠ concentration*. - It represents *the tendency of a substance to react* or participate in a chemical reaction. Basic formula: - *a = γ · c* - a = activity - γ = activity coefficient (depends on the solution) - c = concentration *Example:* - In pure water, the activity of a dilute…

here’s a starter pack of 10 chemistry questions you could post in those forums to begin interacting. They’re written in beginner-to-intermediate level English, so you won’t feel lost, but they are also interesting enough to get real answers from other people. --- 🧪 10 Starter Chemistry Questions for Forums 🔹 General Chemistry 1. Why does table salt (NaCl) dissolve easily in water but not in oil? 2. What is the difference between a mixture and a compound in simple words? 3. Why do some metals rust while others (like gold) never rust? 🔹 Physical Chemistry 4. How does temperature affect the speed of chemical reactions? 5. What exactly is the difference between…

You want me to go deeper into point 5 (Radiochemistry & Nuclear Applications) and point 10 (Chemists as Universe Builders) — not just a small explanation, but full detail. Let’s expand both. --- ☢️ 5. Radiochemistry & Nuclear Applications (Expanded) Radiochemistry is the chemistry of radioactive elements and isotopes. It’s not only about bombs or reactors — it’s about medicine, agriculture, industry, and space. 🔹 Medical Radiochemistry Diagnostic Imaging: PET (Positron Emission Tomography) uses isotopes like Fluorine-18. They emit signals that scanners capture, letting doctors “see” inside the body in real time. Targeted Cancer Therapy: Isotopes like Io…

Content Warning: This post mentions urine storage and may be unpleasant to read. Hi everyone, This is a bit embarrassing, but I really need some advice. Due to a long illness about a year ago, I had to use 2L PET bottles to urinate in. I sealed them tightly and planned to throw them away, but couldn’t manage it. So they’ve been sitting at room temperature for about 1 year. I’m worried that opening them could release toxic gases like ammonia or hydrogen sulfide. Could opening them indoors be dangerous or make someone sick? Also, does anyone know roughly how much ammonia or hydrogen sulfide can build up in sealed urine over that time? Some of the bottles still look like the…

Hello. Cannot remember the name of something that greatly affects rivers life from runoffs, if it was some insecticide or a fertilizer applied to soil in farms and its bad effects do not fade or decay with time. Was subject of many discussions ~10 years ago. If anyone can tell some names I may remember its. Something like permitine perhaps ? Thanks.

sucker for personalities, but this looks like star trel replicaotor stuff https://www.chem.gla.ac.uk/cronin/ what say you folks? i have this intuitive sense of chemistry as a kind of rube goldberg machine, reactions upon reactions, kind of thinking of membranes and energy transfer in batteries and so on. this is a departure for my intuition

A recent YT video by Joe Scott* refers to the odd phenomenon of how mundane items that are part of the fabric of everyday life can quite suddenly fall out of use, and their nature and purpose can become completely forgotten within little more than a generation. One of the examples he cites is popularly known as the ‘Third Condiment Mystery’, and was first mentioned by the American author Bill Bryson in his 2010 book “At Home: A Short History of Private Life”. https://nowiknow.com/the-mystery-of-the-third-shaker/ The essence of the problem is that well into the late Victorian era, silver cruet sets (like the one below) used to be supplied with three shakers and two bottle…

I've annotated this diagram by Dr Ralph Lorenz about the hydrological cycle on Titan. Does it look right? CHEERZ, GIAN🙂XXX (science age; 12)

In his book Saturn's Moon Titan; A Workshop Owner's Manual Dr Ralph Lorenz has a graphic describing Titan's meteorological/ hydrological cycle, and also a chapter. I've attached a scan of the graphic with 3 questions. Can anyone give me a hand with my 3 queries please about methane diffusion, blue and red photons and infrared photons? Re query 1, at the top of the diagram it looks like Methane rises into the atmosphere and then "diffuses" into other chemicals Thanks GIAN🙂 science age 12 (pre-GCSE)

Very weak fresh water source trickling over the land. Have made a sump to collect water however when putting in the container it will disturb the silt on the bottom making it really cloudy. I know the water is pretty much crystal clear as I collected it before this by making an elevated point so it pours straight into the container however the stream is so slow that it would take about 30 minutes to fill that way which brought me to the sump idea. I have some pond liner spare which was given to me. Don't ask me what 'specifications' it is as it was just what was lying around in the garage for however many years before given to me. Would laying that dow…

Maybe a rudimentary question for yall but was not getting much useful information from diyers. I have a cooktop in a van with the normal heat resistant glass but due to the bumping around when driving as well probably to poor design quality of the glass it cracked. Rather than replace with another glass one which is liable to crack I thought why not replace with metal instead. The size I want is relatively small at 29x29cm. Thickness 1-3mm will do. In my naivety I did not consider the issue of warping at all and just bought standard 3mm mild steel since it was cheaper. Placing the metal in the recess and firing up the cooker the appliance didn't e…

Hello, my name is Jack. I'm 65, live near Atlanta, and have never studied chemistry. I've been curious about chemistry but was never taught it in school as I went to a trade school. I have a ton of the most basic chemistry questions. Thanks.

Hi, I'm new here! I started this account to not only get answers to all of my chemistry and all things science questions, but also to know what it's like to be in a community of people just as curious as me. My first question here is this: Can anyone who knows chemistry or anything about cultured milk tell me all there is to know about it in the context of human health and diet? I can't find any straight answers on Google (most answers are for cooks and people with white worms or animals).

Hi again science forums! Me again, back with a bit more material related question. As someone with near zero background in chemistry, I want to know if polyurethane ( sometimes referred to as PU) foam is safe? My preliminary readings and research shows that a residue called " isocyanates" left over by the processing of polyurethane foam, among others, could be quite problematic. There are articles on the internet suggests that it is best not to use mattresses with polyurethane foam as the stuffing. Again, I want to know what people who specializes in this or have received higher education in chemistry think of this?

The BBC's GCSE Chemistry page says there are eight 8 groups in the Periodic Table; 1-7, plus 0 (noble gases?) But there are ten columns between 2 and 3 with no number: https://www.bbc.co.uk/bitesize/articles/zptfn9q#zkn27yc However, other versions of the Table like this one from the The Royal Society of Chemistry show 18, eighteen groups. What's going on?? https://www.rsc.org/periodic-table I should emphasise that age 32 I'm pre-GCSE level so my science age is about 12½ please keep answers as simple as possible Cheerz GCSE GIAN😊XXX science age 12½

Greetings.. Seen on data charts Sb boiling at 1950 C ; Sn boiling at 2602 C ; Pb boiling at 1749 C ... If water boils at 100 C, and emits/turns to steam above it; what do metals emit when boiling ? Themselves in gas form ? That gas, if cooled, precipitates / 'rains' ?

I already tried asking this on a more gardening based forum which would be more fitting for the subject matter but they just shut down their rational minds and became emotional accusing me of being a troll or that I deserve to be proscuted for making such a suggestion. So, 'humanure' is a practice of making ones waste into compost over a year plus to kill the pathogens or such. They had no issue with that but when I suggested using it without waiting, for the reasons below, they would not even entertain the idea and started the name caling. I will add that I read that 40% or more of crops grown now are of the 'bio-solid' grown variety. Sure they wi…

Excuse me, my name is Kairi, I am a child aspiring to be a chemist. Can anyone here help with that?