Chemistry

I passed a current through a solution of water and Epsom salt using a copper wire as an anode and a paper clip as a cathode. This produced a blue precipitate, which I filtered out. Can anyone tell me what this blue substance is?

Hello you all! Boctane is a rocket fuel, designed to be compatible with kerosene, performing 4s better than RP-1 and 7s better than Jp10. According to http://www.freepaten...om/6415596.html it should be Cyclobutyl-Cyclobutane: I wonder: how easy is it to produce? Apparently naphthenic crude oil contain some cyclobutane, which I imagine is the difficult part of the job. How easy is it to bond to rings then? React with chlorine first, then Chloro-cyclobutane with cyclobutane? Impossible? Other ideas? And would you know its physical properties: melting - flash - boiling points, density? Reliable information for its heat of formation perhaps? http://www.p…

Is it legal to take Americium 241 from an ionization smoke detector? I want it for my element collection.

what is the meaning of uniform composition? I know that a solution or a mixture has uniform composition if all sections of it as the same properties..... a solution like pure water can be called of uniform composition because it is made up of h2o molecules throughout and that is what we find when we keep on dividing it. but a mixture like salt and water has particles of nacl in between particles of h2o. so why do we call it as of uniform composition?(as these nacl particles may be less and present between some h2o particles and present not in some others)

Hi, So bubbling chlorine through potassium ferrocyanide is a production method for potassium ferricyanide. I use potassium ferricyanide as a bleach for films with a halide salt. As it gets used, potassium ferrocyanide is formed. So I can regenerate this by bubbling chlorine gas through the solution. If I use Sodium Chloride (normally it's Bromide, but Chloride works fine for bleaching purposes too) I'll have less trouble, and the chlorine will also re-halogenate the solution, although perhaps I should use potassium chloride. In any case, my question is; Once all ferrocyanide has been converted to ferricyanide is there a further reaction? …

How is V1-V2 (stage 3, point 6) used in calculation? Why is it needed to know? clear image

Can any body explain the real chemistry behind Chromatography?? I have very polar amine, with primary, secondry and tertiary N's. I want to purify it. I tried using alumina TLC with even 10% MeOH/DCM with trietyhyl ammonia, but my compound is not even moving from base line. What should I do????

Batteries are almost everywhere from mobile computers (like laptops), to cell phones and even in cars. So my question is: What is the most durable kind of battery? Is there a battery that can last for weeks without needing to be recharged?

OK, I know this is most likely a load of nonsense, but I just have to ask. I heard someone at my university discussing an incident which allegedly happened while they were in high school involving some moron swiping a whole bunch of pure sodium or potassium metal from the chemical store room (don't ask me how he could have gotten in, because I have absolutely no idea) and flushing it down one of the school's toilets. Now I can maybe see some idiot prankster actually pulling a stunt like that, but I am extremely dubious about the alleged results of this prank; basically the metal reacted exactly as you would imagine it would a few seconds after coming in contact with …

Anyone know where I can find tables of kinematic viscosity for ethylene glycol / water solutions? I need to design a cooling system using a 50/50 mix @ 100C. Thanks in advance.

I am looking for a scientist who has access to a labarotory and has some knowledge of toothpaste or similair products and their ingreidients. I am happy to pay for this service. The right person would need to be happy working under a Non Disclosure Agreement. I am based in Wales, so it would help if you weren't too far away. Can anyone help?

A while back my chemistry professer wanted to teach me about explosives and how to develop newer and better explosives. I accepted and we started to learn about RDX and different related explosives with the RDX base. Soon I started to develop my own explosives (all in theory of course). But, I stubbled upon a very interesting property. I wanted to find out which chemical caused RDX to have and extreamly high negative heat of formation. Through a bunch of calculations I descovered that nitrites caused RDX to have a positive Hf. Whereas peroxy acids and hydroxides decreased the Hf. The more of each group I added to the RDX molecule the greater its effects. I tried th…

In an effort to understand how little I understand, I must ask a question which is in all likelihood extremely foolish. The defining difference between elements on the periodic table is the number of protons in each atom, and my question is how does the number of protons, neutrons, and electrons translate to physical properties such as 'wetness', durability, and structural integrity?

to my best knowledge, thermodynamic stability is a gauge of how readily a compound will reduce to form a product...(correct me if im wrong) kinetic stability on the other hand is a gauge of how much input kinetic energy is required in order to initiate a reaction...(correct me if im wrong) with this in mind, a standard pyrotechnic composition would be extremely thermodynamically unstable, meaning, it reacts vigorously to form products upon reaction...however, since most pyrotechnic compositions require an outside energy source to be initiated, i presume, pyrotechnic compositions would be extremely (or mostly) kinetically stable compounds. with that in mind, to…

Why is this reaction carried out in an acidic solution? MnO4- + 8H+ + 5Fe2+ àMn2+ + 5Fe3+ + 4H2O Really appericate any help on this one, and sorry if its in the wrong place.

"Strontium sulfate has a lower solubility in water at 25 °C than calcium sulfate. On the basis of this information, suggest what you would observe when dilute sulfuric acid is added to a solution of strontium nitrate with a concentration of 5 g per 100 g of water at 25 °C. Write down a balanced chemical equation that is consistent with your observation." Can anyone please help me work through this question? I'm stumped.

Can someone please explain why you would use a spectrometer rather than a simple flame test to identify the atoms in an unknown mixture? I'm guessing that the spectrometre would divide the spectra into a much more specific pattern, so that you could identify the individual elements in the unknown mixure, wheras the flame would only give you a mix of colours, thus giving the flame a single coulour consisting of all of these different colours. So the flame test would make guessing the elements of the unknown mixture impossible. But I'm not sure if this is the best answer I can give to this question? Maybe they are looking for something more specific, or am I just overcompli…

Hello, I'm not sure if this is in the right forum or not (I don't think so... ). Science forum was the first thing that popped into my head for some reason and then I ended up here. Anyways, I'm looking for a material that is sticky, specifically sticky to human skin. The material needs to be able to be stuck and removed several times. Maybe I'm in the complete wrong place, if so, please let me know. Thank you very much for your time!

If a material undergoes a phase change from solid to liquid ( for example from ice to water ) , does this show melting has taken place , without having to show that the reverse phase change ( from liquid to ice ) is attainable ?

Hello, if I have 2L of soup but it is twice as too salty and I want to make acceptable how much water must I add?

Hello everyone I am working with surfactants to develop a cleaning system for helicopter's turbines and I wanted to ask you a question ... I use a variety of different types of surfactants including CTAB, CTACL, sarcosine and Triton, and when I prepare aqueous solutions, they appear clear ... but I have a question on another surfactant named Brij 35 ... you think it is normal that an aqueous solution of 5 mL 0.05 M Brij 35 appears white and not clear?...and when increasing the concentration becomes very viscous gel? Sorry for the bad english, i'm italian

Hi all, I need help here. I am working on amino acid-base surfactants. After I prepare the solution (mixture of anionic and nonionic surfactants) and keep it at low temperature (5degC), lumps start to form which I suspect it is caused by the amino acid surfactants. Any solutions to eliminate the precipitation at low temperature? Thanks. SL.

Anybody know how to evaporate a solution of oxPAPC and chloroform under a stream of nitrogen/argon gas to stabilize oxPAPC for storage? I have no clue what to do!

Hi there. I'm doing an Investigation into the chlorine concentration in fruit vs canned fruit and need help with the calculations. I know how to get the moles of the chlorine reacting (I am using the Mohr titration method) with silver nitrate, but the problem is with how I added 20ml of the juice to 150ml of distilled water. eg 1. Determine the average volume of silver nitrate used from your concordant titres. 2. Calculate the moles of silver nitrate reacting. 3. Use the following reaction equation to determine the moles of chloride ions reacting. Ag+ (aq) + Cl– (aq) → AgCl (s) 4. Calculate the concentration of chloride ions in the diluted seawa…

I recently saw a question about the difference between strong and weak acids. The question stated that hydrochloric acid is known as a strong acid as it dissociates completely, whereas a weak acid would reach a dissociated equilibrium (or words to that effect). This is true for acids such as ethanoic acid of course, the question used hydrofluoric acid as an example. I was under the impression that Hydrofluoric acid is a strong acid, and the electronegativity of fluorine would mean that it would readily form the fluoride ion. Is there a mistake in this question, or is there a reason why some could consider hydrofluoric acid a weak acid?