Chemistry

Hello -- I'm a writer with a couple forensics questions. Sorry if these sound a bit macabre, but it's purely for fiction purposes, I swear. 1) Is there any way to detect blood with household chemicals? I know that crime scenes use luminol or phenolphthalein, but -- as far as I know -- there's no moderately easy way to mix up a homemade batch of anything comparable. Preferably, I'd like a way for a forensically knowledgable protagonist to detect traces of blood that have been wiped away from a surface without the help of a blacklight. Any way to do this? Any easy substitute for phenolphthalein? 2) Somewhat related to question one, I read somewhere that if you put…

I'm trying to find an easy path to accurate temperature control while heating and maintaining the temperature of liquids. Currently I use the traditional method of a hot-water bath and thermometer. But I'm commonly getting temperature variances of 3C each way, which is more than I want to see. Volume of liquid I work with runs from a 1000ml flask to a 7 gallon pot, temp ranges run from 15C to 105C. I'm working with cheese-making, mushroom culturing and lautering, a few of my collection of back to the Earth hobbies. So while these are biological processes, this question is about equipment more commonly used by chemists. I'd like to find a technique or affordable h…

I really don't know. I heard they put them in nickel containers or something, any idea?

Hi, i'm trying to acquire the chemical HgBa2Ca2Cu3O8 aka Hg-1223. does anyone know who i could contact to get some? or if thats not possible, can anyone post a link to the method of producing this compound? the best i've found is http://www.freepaten...om/5858926.html however i can't understand this page because i don't really know much about chemistry (hence im posting here ) and heck, i can't even tell if this page actually makes any sense. can anyone tell me if it does or doesn't ? anyway, any information on how to acquire this substance would be greatly appreciated~ thanks in advance.

At what altitude will a trash bag filled with helium and tied at the bottom to stop leaking explode and fall back to earth? Can someone give me a rough estimate? Also, would it rise further up when the temperature is cold or when the temperature is hot? Thank you.

Hi, I'm looking for alternative ways of HPLC and high boiling solvents removal to freeze drying and speed vac concentrator. Particularly, I would like to hear your opinions on Biotage V-10 and Genevac. Thanks!

http://www.instructa...Energy-Reactor/ The "Fusion Jr." Home Energy Reactor is in essence a mini-generator that derives its power off of combustible waste material (like paper, wood, yard clippings, and even some plastics) inspired by "Mr. Fusion" as seen in the movie "Back to the Future II". The potential for energy generation is great, and, in fact, this technology was used to power many cars during World War II and is a suggested energy source for developing countries (to provide gas to power stoves mainly). This is a truly unique project (never been done before), and, if completed, you can say that you have successfully converted garbage into electricity! This…

I am currently working on installing and running the Tinker Molecular Design program so I can run molecular dynamics calculations on molecules I have made in my college summer research experience. I have the program up and running, but when I enter the Cartesian Coordinate File the program will not run and says an error a long the lines of "Cartesian File error at atom 1". If anybody can help me solve this problem it would be greatly appreciated. LukeMonty

traditional black powder is often described as containing potassium nitrate as it's primary oxidizer. however, in blasting, there's a different formula which utilizes sodium nitrate. in my experience, sodium nitrate doesn't produce quite as "fast" a propellant as KNO3. one of the major differences is that sodium nitrate is much more hygroscopic, and is easily fouled by humidity. here's my question. in my field (fireworks), sodium nitrate is regarded as inferior. the only reason it's preferred in blasting, is because it does an acceptable job, but for around half the price. im wondering then, why sodium nitrate is actually preferred for smoke producing mixtures? …

Hi guys How can we correct week metalization in PCB plating???

In my side career, im graced with the opportunity to create some spectacular visual effects. One of these is a fireball. Generally speaking, we can use cremora or naphthalene in powder form, resting on a bed of black powder, and initiated via electronic match from a distance. This produces a decent flame ball. One of the crowd favorites is the petroleum flame ball. The same process is undergone, however the black powder is isolated in an inert container. This produces a very intense effect. Vast quantities of heat are given off, and the ball of flame exhibits a very cool rolling effect. My question being...I've always had success coloring fires with various salts, and im …

Hello All ! I'm new here and this is my first post. My disclaimer is that I am not a scientist, just a very curious software developer that wishes he was a scientist! I was wondering just how super cooled elements such as Hydrogen , Nitrogen and Oxygen are made. Are these elements placed under great pressure to achieve the temperatures that are several hundred degrees below zero? Please accept my apologies for such a rudimentary question! Thanks in advance Scott

So I'm degasing a solution in a glovebox. The way we did it is get a rubber septum that can cover the bottle opening. We stuck a needle through the top of it, as well as a glass tube with a porous end. We used the needle to create a vacuum in the bottle by hooking up it up to a pump. The glass tube is submerged in the solution, but is stuck through the rubber to be the only opening into the box. The argon from the glovebox then flows down the glass tube and out the frit at the bottom, degassing the solution. I can't figure out why the gas would be sucked down the tube. Sure there is a vacuum in the bottle, but the tube opening is submerged. It doesn't know or care tha…

Step 1: MgSO4+ 2NH4OH ==> Mg(OH)2+ (NH4)2SO4 Dissolve Espom Salt in excess ammonia, collect PPT and dry solution Step 2: (NH4)2SO4+ 2O2==> N2+ 4H2O+ H2SO4 Heat and oxidize ammonia and collect H2SO4 What is the ideal temperature and pressure to perform the 2nd step?

if there is a canister of CO2 at 1200 Ibf/in2 (8MPa) and the liquid CO2 is released into standard atmosphere pressure and temperature conditions, how much energy would it take for the CO2 to evaporate?

Hi there. I am a new member here. I would like to ask if anyone can provide me the answers for the Australian National Chemistry Quiz from year 1992 to year 2010? (any year would do) Much thanks !!!!

Natural selection (NS) is the cutting edge of Darwinian evolution . NS is death by many cruel & unpleasant means -- predation , starvation , climate change , etc etc . How could such a system be put in place by a benign & loving God ?

could somone tell me the chemical formula for polyehtylen glycol and calcium hypochlorate ive heard a experiment of it but i cant find the chemical formula for it to do the stoeichemistry. thanks

Would anyone be interested in this software/program that I made for a school project? Right now it is unfinished, and is in Spanish, the final product would be in English and also in Spanish, with more features, better logo, etc Here are some screenshots of the unfinished/alpha program: In this picture you can see that if you hover your mouse over an element it gives you basic information. And here if you click an element, it gives you full information, with many tabs such as "Basic info", "Properties", "Electronic Configuration", "Pictures of element usage", etc Also here you can see the search tool where you can sort the elements b…

With the arrival of British summertime and all this rain it's becoming unbearably warm sometimes during the night. It would be uneconomical to install a dehumidifer for the short few weeks of each year i'd expect this to last so I was thinking of other options to do away with the unpleasently sticky nights. Would a large bowl of regular table salt sort this problem out for me? would it lower the humidity within a small room and how does it work?

Hi I've posted this in the physics forum but it might be more appropriate for here; I'm trying to make a layered smoothie that remains layered when shaken. I'm aiming for about 5 alternating layers of 2 different flavours. I was trying to work out the best way to do this, would each layer have to be more dense than the last (smilar to oil floating on water)? Or would I have to reduce the viscosity of each alternating layer by adding something like honey to increase the thickness? The idea is that when the drink is shook it will go back to its normal state of 5 alternating layers and not mix together. Does anyone know how I can do this? Thanks Charlie

may i know.. when the experiment to find the formula for zinc chloride, why we can't weigh the zinc chloride when it still hot??

whats the difference between alkali metals and alkali earth metals ?

This may sounds really ridiculous to ask but I really don't know this. And I really need some answers!! How chemical bonds affect the density of molecules? Is there such thing like which bonds formed between bond will affect the density of particular molecules? Is there comparison made between the density of molecules formed by different bonds such as hydrogen bonds, covalent bonds, ionic bonds, disulphide bonds or etc? Is it just the molecular mass that affect the density? Is there explanation why Iron and water decreases in volume when they change from solid form to liquid form? (Need someone to help me on this!! Spammer pls leave!)

Hey,,, someone here worked with NICKEL CHLORIDE HEXAHYDRATE? i have in the lab a big stock of it, but i wanna work with the dry nickel chloride! it can be dried good enough on high vacuum and heat to work with moisture sensitive ligands? or i should order dried one?