Chemistry

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 …

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

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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…

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…

Hi. ¿Any modern progress in the subject, can it be done? Some rubber parts change their properties with time or exposure to something, turning soft and gummy... Is it because they were poorly vulcanized, or they are not rubber, or had a different manufacturing process ? Miguel

Hi all I wonder what 'experimental uncertainty' means here. 'All measurements are approximations--no measuring device can give perfect measurements without experimental uncertainty.' Thank you

"Add starch just before titration end"WHY?

Hi, My sister is going to graduate in a few weeks and a couple of my friends an I plan on throwing them a graduation party. Part of this party is pyrotechnics (of course ). Now one of her friends requested an exploision. There are many different ways of making things explode.. but I figured if I'm gonna blow something up, why not make it spectacular. What I want is the type of explosion that is very 'firey'. Not just a dry 'bang'.. now the main problem is this: I do not want to use any volatile substances.. no gasoline or pretty much any hydrocarbon. I want it to be as safe for them as possible.. of course its never really safe when dealing with these kinds of thing…

Why is empirical formula called 'empirical'? I don't get how it is 'empirical'. This is what my dictionary gives me: 1.: originating in or based on observation or experience *empirical data* 2 : relying on experience or observation alone often without due regard for system and theory *an empirical basis for the theory* 3 : capable of being verified or disproved by observation or experiment *empirical laws* 4 : of or relating to empiricism Thankyou

hey guys, this thread falls into the catogory of both chemistry biology but more so to chemistry so I put it here. I've always been interested in chemistry off and on. I've always wanted to mix things together in a beaker, cause it bubble, glow, smell, turn into something new, and everything else. the only thing I really did was do the famous vinegar and baking soda fizz reaction that blows out carbon dioxide...really only useful for bad smell and blowing out matches... soo...I was wondering if you guys could tell me a list of chemical combinations that react in different ways like this that I could do just for fun, that aren't too dangerous, but that use …

What exactly is a molecular ion? I ask because there appears to be nothing obvious that distinguishes a molecular ion from a polyatomic ion. I would be satisfied with personal inference but that merits nothing in regards to the correct and rigorous classification. I'm not sure if there's actually a subtle difference or if the terms are synonymous and thus interchangeable (the Wikipedia page seems to support the latter notion). If there is a distinction, I suspect it has to do with the type of bonding involved. Just looking for someone to shed light on these two terms. Thanks in advanced

Hello. I used to mix luminol with bleach to get chemiluminescence for a few seconds. The commercially sold glowsticks are able to glow for hours. Does anyone know what is available to get this more "permanent" kind of luminescence? Thanks in anticipation

The difference between the boiling point of methane and chloroform. Methan's boiling point is -164 C and chloroform's boiling point is 62 C. Explain the difference between two boiling points. I do not get this question at all and really need help answering this particular question. Both the CHCL3 and CH4 have the same shape....but how does that affect their boiling points.

The potential of two chemical cells, the standard and the unknown, were determined to be 0.915 V and 0.328 V, respectively. If the pH of the standard cell is 1.56, what is the pH of the unknown cell? If the standard calomel electrode (E = 0.244 V) was used to determine the cathodic potential of the standard and unknown cells, what are the values measured?

Hello all I have been studying about lattices recently and have come across the law that each ion is surrounded by 6 oppositely charged ions. However, if we consider the topmost unit cell of a lattice in a solid, how can the top corner ions be surrounded by 6 oppositely charged ions when there would be no unit cell above it? awaiting answers, thankyou

Hey, I'm new here and I didn't really know where to ask this question. I figured that since we breathe out CO2, then this might be a question for the chemistry catagory. So anyway, I'm wondering why steam comes out of my mouth when I sqeeze the gas inside of my mouth. It could be oxygen that I'm sqeezing, but it could also be the CO2 that I'm squeezing too. For all of you who are wondering, to make the steam come out of your mouth, fill your mouth with some type of air, then puff your cheeks out as if you are playing the trumpit. Then softly and slowly open your lips. Some type of steam-looking gas will come out. Why is that? Thanks in advanced, gu…

I'm kind of fed up with all of the wrong accusation that my teacher has been making in her math word problems that's supposed to be "practice". Yes, they do help us practice, but that's besides the point. In quite a few, I have found completely WRONG information, which just annoys me. I couldn't confirm this anywhere else, so maybe here might help. Does anyone know what % of carbon is in carbon monoxide and carbon dioxide? In a certain problem my teacher gave me, it says "Carbon monoxide is a gas that is 43% carbon. Carbon dioxide is only 27% carbon." Thanks!

hi, this is probably a simple question. I am an ambulance officer and as such am always using medical grade 02 i wonder how this is generated; is it a chemical process? eg reacting something with water, or is it extracted from air? thanks any help would be appreciated. Just after some investigation is it just from the electrolisis of h2o if so how are they seperated?

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)

Hey all,,, I have synthesised the compound 1,3-Diisopropylimidazolium chloride according to the patent procedure, and i have it by NMR, but it still contains contaminations, and i get it as a brown tar insted of brown solid,, what is the best method to wash this product? i washed few times with THF, but it still oily instead of solid! thank you,, Dana

I need to make a solution of Glycerol (per liter) 150 g (1.26 g/ml), final conc 15 % w/v. And here comes the clue, the only thing we have is glycerin (and that's the same, I know that) but that's is liquid! I have found that i should go this way: Glycerol/glycerin has a density of 1.25 gm/mL. 15 % (w/v) is equal to 150 gm/Liter = 12% (v/v). (150 gm/L)/(1.25 gm/mL) = 120 mL of glycerol/L. My question: Is gm the same as g? How do you get 15 % (w/v) Glycerol= 12% (v/v)glycerin ? Hope for inputs. Thank you.

Anyone know good books about chemistry in the 18th & 19th centuries? I'd like to learn more about that so I can integrate it into my history classes.

Hey! I have to answer this question about and unknown solution: The unknown solution could be Ag+, Ba2+, or Fe 3+.To find which cations are in the solution you add the following solutions. No precipitate is formed when NaCl or Na2So4 is added to the solution. When NaOH is added a precipitate forms. Which cations are present of the 3 mentioned above? I answered the question that the cations present are Ag+, and Fe3+ because they are more insoluble thatn Ba2+ which produces Ba(OH)2 (aq). Am I right with the explanation or totally wrong? PLEASE HELP!!!!!