Chemistry

Since many chemical reactions use iodine, I was looking into making Iodine and stumbled across this thread http://www.scienceforums.net/forum/showthread.php?t=10886&highlight=Iodine. Iodine tincture contains Iodide Ions which allow Iodine to dissolve readily in water. By passing though chlorine gas though the solution of tincture, we are able to oxidize the iodide back into iodine which is not very soluble in water. Thus we end up with elemental iodine as a precipitate. Here's a video of my synthesis. http://www.youtube.com/watch?v=-_1-p4paM4U&feature=channel_page PS. Iodine stains everthing

HELP!! I have Nd:YAG polycrystalline residue stuck in my iridium crucible. and I have no idea how to get it out. Can somebody tell me how to get rid of the residue without destroying the crucible? i want the crucible free from any contamination since i used it for crystal growth purpose. thanx~

O M G http://www.jtbaker.com/msds/englishhtml/s3338.htm

This might dip into biology a tiny bit... Within the ingredients of said product it says: "Alcohol %96, Isopropyl Alcohol, IPM, Glycerin" etc. It is marketed as a bactericide and hand sanitizer akin to Purel. However why don't they use %62 alcohol like Purel for maximum effect? Can %96 alcohol kill germs as effectively as well?

This is the question from the lab of "comparision of three isomers of butanol" GR 12 pg 84

I recently had bought a disinfectant surface cleaner wet wipes. The ingredients said it was denatured alcohol 70.0, and that the denatured alcohol contained ethanol, methanol and one more methyl based chemical. There were other ingredients as well. I do not know the percentage of methanol within the denatured mixture, but I am supposing the worst case scenario is that it is %50. I used the wipes to clean a tabletop, and my hands were constantly wet and in contact with the wipes. The label itself did not instruct to wear gloves, however it did warn that the wipes were not for, "cleaning skin". I had no percutaneous injuries, or wounds on my hands (other…

Hi, The YouTube videos we make about chemistry celebrated their first birthday today, so we blew up a cake to celebrate... The video's here: The actual baking of the cake was pretty interesting too, because we did it in a lab... Cheers for looking! Brady Merged post follows: Consecutive posts mergedFrom the video...

Any suggestions in how to explain to high school chemistry students why negatively charged electrons do not crash into the positively charged nucleus? I have one student who is particularly interested in this topic, however, I am finding it difficult to put it into terms he can get his head around. Some strategies I have used are the Accelerating Funnel Model and the Decreasing Box Model which have helped, however, maybe I need to explain them in an alternative way. Thank you for your suggestions in advance.

A detergent (as a noun) is a material intended to assist cleaning. The term is sometimes used to differentiate between soap and other surfactants used for cleaning. As an adjective pertaining to a substance, it (or "detersive") means "cleaning" or "having cleaning properties"; "detergency" indicates presence or degree of cleaning property. Components of detergent :- Detergents, especially those made for use with water, often include different components such as: * Surfactants to 'cut' (Emulsify) grease and to wet surfaces * Abrasive to scour * Substances to modify pH or to affect performance or stability of other ingredients, acids for rescaling…

Hello, I'm looking for a colourant that's soluble in water, is chemically mostly inert, and washes away easily. I just want to visualize some flows. I used to use KMnO4, but it is obviously not very inert, to say the least ... Thanks for your suggestions, McCrunchy

I've been toying with the idea of using thermite for a demonstration again, but I only have 8 mesh aluminum. will that be fine enough or should i go and buy something finer?

Hello everyone I'm just wondering why is cooling considered to slow reactions. I mean f you want condensation heating would slow the reaction. I like to know exactly how condensation occur at molecular level. I know when you heat gas it expands. So when you cool a gas does it contract, and where does the energy for change phase from gas to liquid come from. Does cooling provide energy too like heat. Why is that when cooling in this case there is not much kinetic energy but a reaction (condensation) takes place. Your help would much appreciated thanks!!

Hi Everyone, First off, let me apologize now if my Science/Chemistry lingo is incorrect. I'm not really a science guy, unfortunately. Now, on to the question! I'm currently writing a puzzle game for the Xbox that's based on Science/Chemistry. The goal is to create as many molecules (or compounds, whichever is correct, lol) as you can in a given time limit. You also have to do this while fighting against your Enthalpy (just like in the real world, some molecules give off heat while others absorb it..). It's a pretty simple concept, actually So, here's the question I have. In my code, I need to be able to refer to these molecules.. And since they are dynamical…

In 20 words or less, how would you define chemistry to a high school student taking chemistry for the first time? Chemistry is defined as ..................................

Hi there I was wondering if someone could give me a description of how the tests that you use to identify anions and cations actually works I did this experiment at college but don't know it actually works lol

I am trying to start back up my aquarium fish collecting and breeding business. One obstacle is the well water I have to use. Raw it is full of iron sulfates and hydrogen sulfide, and other noxious chemicals. If the raw well water is left to sit it goes from a being a thick green to being red orange and red orange mud settles onto the bottom. Once I run it through water a softener system it comes out clear and very soft but still full of hydrogen sulfide and almost totally anoxic. I need to be able to remove the H2S and add oxygen. I have thought of using H2O2 to add oxygen but will this also remove the H2S?

Hello. I'm afraid I'm not a chemist. Is it possible to identify an anonymous substance in a high school chemistry lab using the equipment available? For example, the students are given an unlabeled blue powder and asked to identify it. How would one go about this, and what would the likely answers be? Is this too complex for a school lab? If so, is there a similar experiment one could ask students to do? Terry

O...M....G! This is the most random thing i have ever seen: LINK theodore gray's article

i have a part-time job at a lab where i have to clean glassware with methanol. i work with it for about 3 hours a day, 2-3 days a week. i do wear gloves, goggles, and a lab coat but oftentimes it splashes onto my skin. i also feel like i inhale a good amount of it. is this much exposure dangerous to my health?

So I was at the pharmacy the other day, and noticed they had mineral oil and needing some to store sodium, I looked at the purity and saw that it was 99.9% pure. However, I had also found some from a chemical supplier, and I wasn't sure if theirs would be better - so I figured I would poll the audience- does everyone think / know if the mineral oil from the pharmacy would be pure enough to store my sodium, or should I get it from a chemical supplier? I try and stay away from buying things OTC (like H2SO4 drain opener, due to heavy impurities) but this is from a pharmacy, and is 99.9% so it seems like it would be pure enough...

Hi. Once I browsed a ~400+ page book of formulas with the detailed procedures to manufacture hundreds of real generic commercial products, I remember was over $2000 and well worth them. Examples: formula and process to make brake fluid, detergent, artificial pigment, fly-sticky paper, deodorant, chlorine for pools from seawater... all kinds of things... It is not a household remedies book. Cannot remember the publisher, author, title. Any clues ? Thanks, Miguel

Hi guys, I hope you can help me... I search for "Temperature versus mole fraction for high and low boiling azeotropes - charts" e.g. like those for azeotropes: Maybe for chloroform / water... I found only charts which just showing raw curves... Is there any option to get real charts for that? If you didn't understand what I wanted to say, here is a link to phase diagrams and if you scroll down, for azeotropes, for what I search. http://www.uiowa.edu/~c004131a/LVSolution%20Phase_Diagrams.html thx in advance.

Professor Martyn Poliakoff is distinguished chemistry professor and the brother of a famous film maker... So what does his brain look like?

I want to discolor a 5 Indian Rupee coin to make it look like a £1 GBP coin. What chemicals would I use?

When naming chemicals, “an” stand for c-c bonds and “en” stands c=c double bonds. For example, Propene means 3 carbon atoms consisting of double bonds within the structure Prop – 3 carbon atoms en - double bond I saw in an article, the following name with the structure – cyclohexane : CH2 - CH2- CH2 -CH2 -CH2- CH2 “an” means no double bonds. Doesn’t the above structure have double bonds ? shouldn’t it be cyclohexene ?