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Chemistry Sets for Adults?

An Anonymous Coward asks "I've been pursuing a few different lines of study, to refresh myself in basic sciences before I return to school. Right now I am reading up on Chemistry, and thought it would be fun to acquire a chemistry set just to play around with and maybe learn a few things from. Do any science geeks here have any suggestions?" My childhood garage probably still has purple and black stains all over it (lucky I was wearing glasses). 300 in one electronics kits, anyone?

52 of 319 comments (clear)

  1. For adults? by Anonymous Coward · · Score: 5, Funny

    I hear those rolling methamphetamine labs are getting pretty popular.

    1. Re:For adults? by Master+Bait · · Score: 5, Informative

      That dude shouldn't get just any chemistry set. He should ignore inorganic chemistry and go for the gold (organic chemistry). He needs to read Phikal first. Then he needs to check out Rhodium and The Vaults of Erowid and a gander at The Lycaeum

      --
      "Only in their dreams can men truly be free 'twas always thus, and always thus will be."
      --Tom Schulman
    2. Re:For adults? by morie · · Score: 4, Funny
      Whatever you would classify "Gold" (Au) under, it most certainly should not be Organic Chemistry

      :-)

      --
      Sig (appended to the end of comments I post, 54 chars)
  2. Why do we need these? by packeteer · · Score: 4, Interesting

    So called "childrens" chemistry and electronics sets are perfectly good for adult too.

    --
    unzip; strip; touch; finger; mount; fsck; more; yes; unmount; sleep
  3. Essential oil extraction by MrLint · · Score: 5, Interesting

    When i was in Orgo chem the *best* and coolest thing we did was extract limoene (orange oil). But you need reflux glassware for it.. but i'll tell ya the stuff smells great. and the practical upshot is that you can use it and other essental oils as food flavorings

    1. Re:Essential oil extraction by jayed_99 · · Score: 5, Informative
      *snickers* (Sorry, I was thinking of a time when I saw an idiot put a drop of pure pepeprmint oil on his tongue).

      I wouldn't advocate using most essential oils in food. You could use them in absolutely microscopic amounts -- but most kitchens/chefs don't have the tools, time or inclination to measure out correct amounts of essential oils. And leaving out the "potentially physically unsafe" part of it, essential oils are so strong in flavor and scent that they will easily overwhelm the other flavors in a dish.

      That's why most commonly used "food safe" extracts have an ingredient list that goes something like "distilled water, alcohol, whatever oil". The water provides a buffer.

  4. CBS by radiashun · · Score: 5, Informative

    Carolina Biological Supply has a bunch of learning kits, books, and software that would probably help you out. We get most of our lab supplies through them.

  5. do you really want to do titrations? by black_widow · · Score: 3, Insightful

    Personally, I never learned any practical info in chemistry labs... Come to think of it, high school chemistry is all you're ever going to need unless you're going to be a chem engineer.

    1. Re:do you really want to do titrations? by jayed_99 · · Score: 3, Interesting
      Well, at the rarefied heights of "chef" and "pastry chef" there is generally a pretty good working knowledge of a limited subset of organic chemistry as it relates to food and taste. And sometimes a pretty impressive set of knowledge -- find a good pastry chef and ask them about the chemical interactions involved in a loaf of bread...and be ready for a 2 hour long lecture.

      A guy I worked with once told me "if you're cutting up a steak for people to sample, don't cut it into little cubes...cut it into long, thin strips...it tastes better because it provides a greater surface area for {big long enzyme in the saliva} to work with". (He then told me, "I learned that in the Organic-Chemistry-for-Chefs Class that I took last year". (And, yes, he really used the phrase "organic chemistry".)). Of course, I immediately put this to a field test with about 5 people (including myself) as test subjects. Sure enough, he was correct...the same steak -- when cut into long thin strips -- tastes better than the when it's cut into an volumetrically equivalent cube.

  6. Re:Why? by kingkade · · Score: 3, Insightful

    Well a book and hands-on experimentation don't have to be exclusive of each other. Actually performing and validating guided experiments or coming up with your own to answer problems posed or your curiosity can be fulfilling.

  7. Slashdot: News for Dealers... by Quaoar · · Score: 5, Funny

    I think it's about time we added a "hydroponics" category. Honestly, most nerds will probably applaud it.

    --
    I'll form my OWN solar system! With blackjack! And hookers!
    1. Re:Slashdot: News for Dealers... by CableModemSniper · · Score: 3, Informative
      --
      Why not fork?
  8. My wife got me one :) by Cybersonic · · Score: 4, Informative

    She saw me reading the Radio Shack 'Getting Started In Electronic's book over and over again and (in between studies for various certifications) and decided to get me a kit.

    She gave me bookmarks after chrismas... :)

    Good list of kits: http://www.hobbytron.net/electronickits.html

    I have the 300-on-1 which is $70 and is solderless.

    Also check out http://www.kitguy.com/ - seems to be a definitive resource...

    --
    Cybie! aka Ralph Bonnell
  9. i was gonna mod this up by waspleg · · Score: 4, Funny

    but then i got high err heh

  10. If you realy wan't to.... by oliverthered · · Score: 3, Interesting

    Well, if you wan't to have lots of fun, well kinda, try making some of the chemicals you self or using household goods.

    Amonia isn't that hard to make,
    Ethanol's quite easy too (just don't get caught!)
    Acids are a bit trickier.... but not that hard.

    It'll give you lots of practice nad help if WW3 breaks out(or if you need any 'added-extras' for a night out).

    Things like the anarchists cook book should help point you in the right direction.

    --
    thank God the internet isn't a human right.
    1. Re:If you realy wan't to.... by driftingwalrus · · Score: 5, Informative

      ACK!!! Great stars! Are you *MAD*?! NEVER take anything from the Anarchist's Cookbook. Might as well drink a jug of chlorine, it'll do the exact same thing and save you a lot of time.

      --
      Paul Anderson
      "I drank WHAT?!" -- Socrates
    2. Re:If you realy wan't to.... by Thatmushroom · · Score: 5, Informative

      To clarify, there are multiple versions of the Anarchist Cookbook, and if that's a copy of the original, just strap some TNT to yourself and light it, it really will save you time in the long run. The original is replete with errors, many chemical, that could cause lots of damage.

      However, I doubt that's the original, since the original is extremely rare (if you don't see something about the bridges in NYC, you're not looking at the original). Still, it's not a wise move to perform chemical experiments using instructions from a book that's designed to cause destruction, chaos, and anarchy.

      If you're really just looking to win a Darwin award, however...

      --
      You zap the moderators with a wand of humor! The moderators resist!
  11. sugestion by larry+bagina · · Score: 4, Funny

    ask your local meth lab if you can do some intern work.

    --
    Do you even lift?

    These aren't the 'roids you're looking for.

  12. My All-time favorite by Superfreaker · · Score: 5, Informative

    Edmund Scientific
    http://www.scientificsonline.com

    My dad used to take me there when I was a kid, a very trippy place. It got me through all of my science classes with pre-made projects.

    1. Re:My All-time favorite by jayed_99 · · Score: 5, Funny
      Some of my favorite childhood memories are negotiating with my father about what I could select as a Christmas/birthday gift from the Edmund's catalog.

      Me: "I want one of those ruby-laser kits."
      Him: "No. What about a prism?"
      Me: "I want one of those sets that has all the chemicals."
      Him: "No. What about a prism?"
      Me: "I want one of those magnets that can lift a small car."
      Him: "No. What about a prism?"

      I got a *lot* of prisms. By the time I was eight, I had about a dozen of varied shapes and sizes.

  13. alright by pummer · · Score: 3, Funny

    first, you buy a textbook, like the one you had in 11th grade. Then, you place it under your pillow and learn by osmosis.

    or

    you take a big ol' jar of gasoline, add styrofoam until you get a play-doh like mixture. what you have is napa----------

    oops, you were asking for suggestions. I thought you wanted to know what I did.

    1. Re:alright by Jacer · · Score: 3, Informative

      it isn't *really* napalm, it's just a very-very fun, flamable paste

      --
      --fetch daddy's blue fright wig, i must be handsome when i release my rage
  14. I just got my own adult chemistry kit. by pi_rules · · Score: 4, Funny

    It's actually a little bit of biology mixed in with a bit of chemistry; but it's really fun to play with.

    It's a home-brew kit for making my own beer :) I could entertain myself for hours with this thing.

    1. Re:I just got my own adult chemistry kit. by pi_rules · · Score: 3, Interesting

      If by "kit" you mean those "Mr. Brew" things you can find in most stores, don't bother -- that beer is terrible. Instead, find your local brewery supply store and get the proper items. If, on the other hand, you mean a "kit" from your local brewery supplier that includes the necessary items you need for brewing, then great. My roommate made a batch of homebrew earlier in December, turned out really good.

      Nah.. I got the real deal. I helped a buddy do a Mr. Brew thing because he's not too quick on the uptake with reading directions and sterilization, but I went out and got the real deal. Four gallon pot for boiling wort, 2 6.5 gallon buckets, one for fermentation and one for bottling, bottle capper, hydrometer, proper thermometer, siphon tubing, etc.

      It'll be a week and a half before the first batch is done, but damn do I have fun watching the little CO2 bubbles coming out of the airlock :)

  15. limonene by SweetAndSourJesus · · Score: 3, Informative

    Uh, limonene isn't a good thing to be eating.

    It smells fantastic, but it's a pretty potent solvent and can irritate the hell out of your digestive tract.

    --

    --
    the strongest word is still the word "free"
    1. Re:limonene by MrLint · · Score: 4, Informative

      Right from that page : Limonene is also used as a flavour and fragrance additive in food, household cleaning products, and perfumes. Im not advocating shugging this stuff straight. Butl ike with any extration of essential oil be it spearmint, peppermint, orange oil, of capsicum the idea it to not over use it.

  16. Modern chem sets useless by Walt+Dismal · · Score: 4, Insightful

    Modern chemistry sets are crap; they have been gutted because of fear of lawsuits. So the materials and the experiments are bland and useless unless you're 8 years old.

  17. Learn to home brew� by (H)elix1 · · Score: 5, Insightful

    I'd be real careful about buying 'chemistry' kits these days. If the war on drugs does not send the suits to your door, I'm sure the war on terror will.

    Brewing - wine and beer are a good start. A fair amount of chemistry (and biology) involved when you think about it. Taking the alcohol content above 15% or so lets you play with even more toys.

    Best college experience was making moonshine from captain crunch in the dorms. A bit of enzymes to convert the starch to sugar, let bubble, then we pulled out the still. Nothing like a mass spectrometer to assure you don't go blind....

  18. 300 in One Electronics Kits by oldzoot · · Score: 3, Interesting

    The experimenters labs are good for starting out - having a structured set of experiments to build, and yes, you can even go beyond those simple experiments and build simple experiments which are not in the book. For the most fun, however, I like the prototype breadboards. One of those with appropriate power supplies and other test equipment is good for analog, digital or combination circuitry. Add a few experimenters parts kits from Jameco and you are in business.


    As for Chemistry kits, I think just buying the labware you need and the various chemicals etc. is a better way to go than a pre-fabricated kit.


    The real interesting stuff however would be a molecular biology lab. Slice and splice DNA and build your very own new and interesting critter! Yes, you too can build your own miltary grade anthrax, plague or even smallpox. Add the THC gene to corn! Create that perfect paisley rose! Be the envy of everyone on your block! hmmmm I better quit now. Seriously, it is probably not all that hard to build a DNA synthesizer. Why not convert an ink-jet printer ? DNA = 4 molecules, many printers have 4 ink tanks. How tiny of a drop can you print???



    Z
    --
    enough is too much
  19. As a Chemist.... by BadlandZ · · Score: 5, Insightful
    You asked for recommendations, so here's mine. As a chemist, I recommend not getting one at all. There is nothing that fun in a chemistry set anymore (for legal reasons, almost everything fun is dangerous, so not in any set). You'll probably find more stuff in your own kitchen cabinet now days anyway if you know what your looking for.

    I would recommend a molecular model kit though if you really want something to play with, or if you want to be more geeky, you can get some molecular modeling software.

  20. Do it piecemeal by elnerdoricardo · · Score: 3, Informative

    Here's an idea.... Here in Toronto we have a great store downtown called Active Surplus. You can buy just about anything there. They have a pretty good glassware section where you can get most of the things you need... stopcocks (*snicker), flasks, beakers, pipettes, etc. I would think that most major metro areas have a similar store. Great place to get all the glassware you'd need. I would think another great source of info and leads would be the local highschool. Go in some day and have a chat with the Chem Teacher. I would think they'd have catalogues and suggestions for what you should have to get started!

    --
    IN SOVIET RUSSIA, sig changes you!
  21. Re:Why? by Simon+Field · · Score: 5, Informative


    I agree. Building your own chemistry set would be more fun, and you would learn more.

    The best way to learn is to teach. Collecting a bunch of good chemistry experiments, and the sources for the materials, would make a great project.

    And you aren't the only one who benefits...

    Some places to start:
    Delights of Chemistry
    Demonstration Lab
    Lecture Demonstrations
    Chemistry Resources

    Some Sources of chemicals:
    CHEM Scientific
    Fisher
    Sagent Welch
    Carolina

    I am certain you will get lots more from other Slashdaughters...

  22. Re:Why? by Gorobei · · Score: 5, Interesting

    Exactly - that was the experience I had with my old 300-in-1 chemistry set about 27 years ago.

    I did 30 pages of book/guided stuff. E.g. filtering a sand and salt solution, then spending 2 hours getting the salt out of the solution... at the end, guess what? I had salt again!!! Gee, that was fun.

    I switched to my own guided experiments soon after that: KnO3 is cool, magnesium burns pretty well, sulfur smells bad, but hydrogen sulphide is even better! My father (a chemist) banished my experiments to the garage.

    Next month, I told my parents I needed a pound of sodium chlorate as a desiccant. My father managed to keep a straight face, but bought it for me anyway.

    Many more self-directed experiments were performed, and I found myself learning in leaps and bounds: I learned about the surface area of reactants when I thoughtlessly substituted powdered charcoal for granulated sugar in a simple propulsion experiment. Haha, skin and hair grow back.

    Chemistry is cool, but make sure your set has fun compounds... I mean, what the hell fun is copper sulphate, etc?

    Also, keep a lab book: it makes for pretty fun reading later in life ("4oz nitrocellulose," what was I thinking?) and is helpful if you screw up and the doctor/bomb-disposal unit needs to figure out what was going on.

  23. Re:If you want good chemistry experiments, by benson+hedges · · Score: 3, Informative
    ask any chemist you know about the anarchist's cookbook, or show them if they don't know it - 40% of the stuff in it doesn't work, 40% will blow up yourself, 15% are urban legends, and the rest may work if you do it right.. if you are interested, get some real books, like "Explosives" by Rudolf Meyer...

    be warned however, creating explosives, or drugs for that matter, is nothing a chemistry kit could archieve most of the time.. the only synthetic drug I am aware of that could be made this way would be GHB, which can be easily produced by mixing two chemicals, then heating them carefully. As for explosives.. creating things that go boom without the exact knowledge of what you do often result in the quick and impressive end of the creator's life. :)

    --
    Karma : Soylent Green (Mostly due to eating junk food and mocking religion)
  24. Re:Chemistry Set by Anonymous Coward · · Score: 5, Informative

    If you are serious about doing synthetic work, I
    would see about taking several lab courses at a
    local college. They are already set up with
    sources for the reagents, safty equipment (ie,
    hoods, glove boxes, safe storage for the reagents,
    safe disposal of the reagents, plus more
    analytical instrumentation so that you will be
    able to confirm that what you made is what you
    intended to make.

    If you really insist on seting up a lab at home,
    make sure that you set up a safe lab. Please do
    the following:

    1) Ensure that you can safely store, handle and dispose of any reagents.
    2)Be sure to join an amateur scientist oganization, and find some help, if only to double check that you are doing #1 correctly.
    3) consider the legal difficulties
    -in the state of texas it is a felony to own
    certain common glassware without a permit.

    Just to be safe, check your local laws along
    with the fire codes.

    4) If you can legally own glassware, consider
    buying the microscale equipment. It should
    be the same price or less for it, however
    you'll use smaller volumn of reagent.

  25. environment, geology by g4dget · · Score: 4, Interesting
    Measuring and monitoring the presence and amounts of chemicals in the environment and in food might be a good area to get involved in. You can get by with limited resources, the experiments tend not to be dangerous, it teaches excellent laboratory technique, and you can accomplish something useful. You could pick a problem that interests you personally (oxygen levels, organic matter, pollutants in a local lake), or you might look around for a volunteer organization to get involved in--they might even be able to provide laboratory facilities and train you.

    Other areas that involve chemistry and makes a good hobby are geology and mineralogy. You can collect samples, characterize them, learn about crystallography, and also analyze the samples chemically.

    And if you get seriously involved, you can actually accomplish new science in areas like those, even with fairly modest resources. There are lots of publications dedicated to both the hobbyist and the professionals in those areas; look at them at your local university library to get some ideas.

  26. Check out the Student Science Service by Avionics+Guy · · Score: 5, Informative

    By all means, check out the Student Science Service (http://www.tri-esssciences.com) in Burbank, California. They sell a few high-end chemistry sets of their own design (these are not kiddie sets). Ira Katz and his daughter, Kim, are the owners and are easilly accessable via e-mail. They're also one of the largest suppliers of pyrotechnic special effects to the local movie studios. Can't recommend 'em enough. -Kevin

  27. Keep a Lab book? Yes! by Vinson+Massif · · Score: 5, Insightful

    Keeping proper care of a --bound-- lab logbook is something I'll carry with me always, regardless of my career path. I still hand-number RH pages in ink; TOC in front; notes on left page; --dated-- documentation on the right. My only backslide is the occasional use of pencil. (I no longer wrangle instruments, now sysadmin.)

    Good logbook habits avoid the WTF syndrome.

    --
    "Remember, any tool can be the right tool." -- Red Green
  28. How to win a Darwin Award by John+Miles · · Score: 3, Funny

    1. Make nitroglycerin from a recipe written by someone who can't spell the names of the chemicals ("sulferic acid") required.
    2. Light fuse.
    3. Get away.
    4. (Your heirs) profit!

    --
    Dahlmann tightly grips the knife, which he may have no idea how to use, and steps out into the plain.
  29. Re:Jackboots and Uzis? by Monkelectric · · Score: 3, Interesting
    I'm not trying to troll, or seem naive here, but is paranoia in the US seriously that high?

    YES! My uncle had a friend buy what he called a "nautical generator" for his boat on ebay (he's not very computer inclined). And a few months later the FBI came to the guys house and they wanted to know what he wanted it for and where it was etc ... Kind of weird because its difficult to think of any nefarious uses for a generator.

    --

    Religion is a gateway psychosis. -- Dave Foley

  30. sciplus by beej · · Score: 4, Interesting
    Cheap beakers and things, as well as a variety of cheap cool geekstuffs: http://www.sciplus.com/

    Warning: prepare to spend at least an hour looking at this site.

  31. Photo Darkroom: the adult chemistry set by sakusha · · Score: 5, Interesting

    Get into developing and printing your own photos. You know, the old analog kind. Even better, study some old antique photo processes like Cyanotype or Platinography. I make my own photo papers using these antique methods, and it is satisfying enough to keep me interested, and I was an Honors Chem major until I switched to art, majoring in photography).
    Making your own printing papers and photochems is a ton of fun, and yields tangible results (unlike most things you could do with a chemistry set).

  32. Interesting experiments: Silvering a mirror by jms · · Score: 5, Interesting

    One of the most interesting and rewarding reactions you can study as an amateur is mirror silvering using Tollens' reagent. I had an arc lamp reflector that needed resilvering, and decided to do it myself.

    After a lot of web research, I found that this website had the best directions (and the best safety warnings!):

    http://lerch.no-ip.com/atm/Silver.htm

    The only chemicals I had any trouble finding were silver nitrate crystals, which can be purchased from photography supply stores, such as:

    http://www.photoformulary.com/

    or ebay, and concentrated nitric acid, which can be purchased from lithography supply stores, such as:

    http://www.rembrandtgraphicarts.com/13_rga_cat.h tm l

    The hazmat shipping charge for the nitric acid will exceed the cost of the chemical.

    The process is somewhat complex, involves a number of stages, but isn't too difficult to do. It's an interesting reaction to watch, and the result is cool and useful. I created a perfect mirror coating on the inside of a bottle on the second try, and successfully coated my reflector mirror immediately thereafter.

    Everything worked for me, except that I found that I had to heat the muriatic acid in order to make the solder dissolve when creating the sensitizing solution.

    That's my recommended interesting experiment.

  33. Who needs it? by Tuxinatorium · · Score: 4, Informative

    You can get all the chemicals you need at hardware stores, etc.

    Examples: ammonia (cleaning), potassium nitrate (fertilizer), calcium cloride (road salt), ammonium nitrate (fertilizer), various petroleum distillates (everything), all sorts of metals, various exotic metal oxides (dry paint powders and ceramic glazes), sodium hypoclorite (bleach), hydrofluoric acid (for glass etching), hydrochloric acid, calcium sulfate (gypsum), etc... you can get almost any chemical you need for any purpose from common products, or manufacture it from common products. You just have to know what you're doing.

    1. Re:Who needs it? by Graff · · Score: 5, Informative
      IAAC (I am a chemist)

      You can get all the chemicals you need at hardware stores, etc.

      I totally agree with this. Most "modern" chemistry sets are so sickeningly-safe that they do not truly allow any chemistry to be done. I would collect your own chemicals, maybe buying a chemistry set to give you some guidance.

      There are several cautions that I would keep in mind. First of all, chemistry is highly dangerous. Many of the "first" discoverers of a chemical compound of process have actually turned out to be the second, third, etc. The true first discoverers literally killed themselves in the attempt and were thus not able to make their claim to fame! The first inventor of gunpowder, the first discoverer of fluorine, chemistry is riddled with those that tried something without understanding the consequences of their actions.

      Get several good chemistry texts and read them all the way through. Start off with simple, harmless experiments. Do not try anything potentially explosive, corrosive, or vapor-producing. Keep several neutralizing agents on hand, such as baking soda, lime, sand, a good multi-purpose fire extinguisher. Perform your experiments in an extremely well-ventilated area that has been fireproofed and is far away from any living or eating areas. A separate shack is a good place. Use goggles, a heavy rubberized and/or canvas smock, solid leather shoes, disposable gloves and face masks for some experiments.

      Never leave an experiment unattended. Never dump the results of your experiments in the same place, they can sometimes cross-react and form a dangerous mixture. Do not store anything which has the potential to become unstable, many nitrogen and phosphorous compounds can spontaneously react and cause extreme heat, vapors, or explosions.

      Make sure of the purity of your ingredients. If you get ordinary bleach for the sodium hypoclorite be careful - perfumes, surfactants, and other agents are often added to them which can cause unwanted reactions to occur. The same goes for household ammonia cleaning solutions. Most metals you will get will be alloys, always understand the elements in the alloy and how they may react in an experiment.

      Yeah, it's a lot to keep in mind, but chemistry is truly a dangerous business. I've been working in chemical labs for over 10 years and I've seen professional chemists with doctorates have accidents that you wouldn't believe. Explosions, runaway reactions, improperly ventilated experiments, splashes of highly corrosive compounds, forgetting to turn on or off some crucial bit of equipment, a lot of people get hurt even in the safest laboratory. I'm very careful simply because every exposure to some of these chemicals shortens my life-span. Many of the chemicals will take up permanent residence in your bones, will leave holes in your liver, will cause you to go blind, or even will make you go sterile. Lots of them have a cumulative effect so every exposure increases the risk, no matter how much time has passed.

      So be careful!
  34. Alfa Aesar by Galahad2 · · Score: 4, Informative

    Alfa Aesar sells chemicals en masse. They'll even send you a catalog for free. I'm not sure, but you probably have to have a license to buy anything from them.

  35. May I suggest a book instead? by MickLinux · · Score: 4, Interesting

    You of course will need chemicals and chemistry equipment. I expect that you could call the local high school and find out where to get them -- and the high school teacher could suggest where you might get a nice sampling. I can't help a lot there.

    But perhaps I could suggest a book, instead:

    Laboratory Experiments for General Chemistry, 4ed
    by Hunt, Block, and McKelvy
    http://www.amazon.com/exec/obidos/tg/deta il/-/0030 32906X/qid=1041495102/sr=1-1/ref=sr_1_1/103-128032 3-3723057?v=glance&s=books

    This one is extremely useful in that it:

    (1) Lists the equipment needed for each (so you can go through, find the experiments that you can do)
    (2) Lists tons of safety and first-aid information, with standardized icons for each item
    (3) provides lab reports to fill out, which will help you understand the experiments
    (4) The experiments are actually rather standard; not all of them require special equipment.

    One word of caution: After produced the book, my brother noted that one of the experiments, standard to most College Chemistry Lab courses, is wrong:

    Experiment 13, the Burning of a Candle.

    My brother claims that the experiment purports to demonstrate the stoichiometry of combustion; in reality, it demonstrates the heat given off by candles, and the ideal gas law PV=NRT. He said that he demonstrated this by attempting the experiment in several different ways, one with 3 candles close together (burning hotter), one with three candles farther apart (burning cooler).

    I haven't done that experiment myself in his way. But I thought I should mention that.

    --
    Correct Horse Battery Staple: 72 bits of entropy. Enter "Correct H" into google. When it generates the phrase, that's
  36. Re:sig by TheMidget · · Score: 3, Informative
    If you want to post really long URL's take a look a http://shorl.com. This is a site that provides shorter alias to URL's that you supply. The alias can then be posted to newsgroups, slashdot, etc, without fear of being broken up. There is also http://tinyurl.com, which does the same thing.

    Of course, as moderation of this post shows, both of them are unfortunately also rather useful for trolling, so I'm not sure how long you'll be able to use these.

  37. Re:Contact explosives! by gte910h · · Score: 3, Funny

    Keep it wet, and it doesn't go boom. :) I had a rackful of this stuff drying in the back of a chemistry class when I was a chem aid. Needless to say, I heard it down the hall (in english class) when the next period's chem aid set it off when moving the rack (which to my credit was marked "Contact explosive, do not touch"

    --
    Want to see every step I took to start my company? http://www.rowdylabs.com/blogs/pitchtothegods
  38. Nitrogen triiodide by MillionthMonkey · · Score: 4, Informative

    Agreed. If you've never seen the Anarchist's Cookbook, it's rather like a long "Overrated" Slashdot post printed on paper with pictures and a handsome black cover. The guy doesn't really understand most of the things he discusses and is on the firmest ground when he sticks with safe topics (guns and knives). It was written during the Vietnam era by a pissed-off draft age guy. Now he's turned to Jesus and says he wishes he hadn't written the book at all. Another mind lost to religion.

    The best explosive recipe in the book is one that the author discounts in passing- nitrogen triiodide, or NI3. (Actually, the structure is NI3-NH3, where the NH3 is bound to the NI3 electrostatically by what resemble hydrogen bonds.) According to the Cookbook a fly landing on it will set it off (which is probably true, although I never succeeded in getting a fly to cooperate). It claims it's too useless for any serious consideration when planning your anarchy. It might not be good for that, but it's great for pranks. I've had so much fun with that stuff. The secret to NI3 is DO NOT MAKE TOO MUCH OF IT. That way you can keep your fingers. A gram is way too much. Just take a few iodine crystals and put them under ammonia, and presto, it turns into this black powder. If you keep it under the ammonia, it's actually quite stable. When not under ammonia (even when under pure water) it might go off at any moment. Pick it up from the ammonia with a plastic eyedropper, and deposit the black sludge on some surface. Once dry it rapidly loses its NH3 adduct and becomes extremely sensitive to shock, decomposing explosively producing N2 and I2. Don't get traces of it on your clothes or skin, or you'll be treated to a continuous snap-crackle-pop of microscopic explosions (quite annoying).

    Finding references on it is difficult- it's almost like people don't want to do research on it. It's probably unstable because the iodine atoms are huge compared to the nitrogen. Congestion around the central N forces the molecule into a planar shape, with repulsive interactions among the three iodines, so it's unhappy for steric reasons. One thing I did find out was that the stuff turns bright orange if you leave it under the ammonia for a long time (like a month). This is probably because it picks up additional NH3 adducts.

    1. Re:Nitrogen triiodide by MillionthMonkey · · Score: 3, Interesting

      the stuff on the edges of the filter paper I'd laid out in the middle of the garage blew up before the stuff in the middle had dried out, thereby splattering the floor with really tiny droplets of still-wet stuff and fragments of filter paper.

      I used filter paper too, until I found a much better substitute- kitty litter! Specifically, that kind of kitty litter that clumps into a tight ball when it gets wet. Dries the stuff out quickly, confines it really well in a tight clump, and transmits shock evenly to all the precipitate at once- so you get huge noisy explosions with a good report- and disgusting iodinated kitty litter flung all over your backyard! None of the snap crackle business you get when the stuff is exposed to the open air. Of course you shouldn't ever do this, ever.

      Explosions aside, iodine itself is fun. I dropped a crystal on a counter surface once (this was when I was a chemist at a generic drug lab) and I noticed it a few hours later. So I picked it up. Of course by now there was a stain on the counter around where it had been. I wiped it up, but it came back.

      The janitor came in, saw the stain, and wiped it away. Within a minute- the stain was back! So he wiped it again. Scrub scrub scrub. As soon as he turned his back- there it was again! Scrub scrub scrub. It kept coming back- and it was getting darker even as you looked at it! I put a thiosulfate-soaked paper towel on it and told him not to worry about it.

      I felt bad for the people who cleaned that place. One of the tablets they made there was phenazopyridine, which is a drug women take for urinary tract infections (it's a urinary tract analgesic). This is one of the azo dyes, which means it has an -N=N- azo bond in it. All these compounds have an intense color. Pure phenazopyridine itself is a dark red powder, but in trace amounts, or when it's been dissolved in alcohol, it turns an intense yellow. (Which is a good thing, since urine is the same color- actually, that's probably why that compound is used for this purpose.)

      EVERYTHING in that place was yellow. People would track that stuff all over the place. There was a yellow streak going down the center of the hallway, the chairs and tables had yellow marks everywhere, the books had yellow fingerprints on them, it was a thin film all over everything and everybody. Even things at home started turning yellow. The tiniest crystal would get on you and that was the end of it.

      And don't even get me started on my idiot boss at that place, who inadvertently rediscovered the formula for dynamite while trying to come up with an FDA-approvable procedure for a selenium assay on vitamin tablets! What a mess that was! But this post is already getting too long.

      Much later I met someone who told me a story about a friend of theirs, who had some leftover phenazopyridine tablets and had noticed the intense color. She actually dyed her hair with the stuff for Halloween!!! Holy crap! Then (surprise, surprise) she couldn't get it out of her hair, so she eventually called the drug manufacturer to ask for advice. They were no help- in fact they couldn't stop laughing at her! (You can actually kill the stain with a solution of sodium dithionite, but this smells so evil we didn't even consider it an option for cleaning the floors. They should have just told her to shave her head and scrub her scalp with lots of rubbing alcohol.) I couldn't believe my ears when I heard that story. Her whole house must still be yellow.

  39. Re:The Kitchen Cabinet by BadlandZ · · Score: 3, Informative
    You actually have a lot to worry about with "pure" chemicals also. I wouldn't recommend doing anything without having a fire extinguisher, goggles, a lab coat (or something that can easily be ripped off of you if you spill something on yourself) and an eyewash and fume hood.

    I suppose being outdoors would substitute for the lack of a fume hood, and a garden hose would be ok for eyewash. However, your never suppose to work alone in a lab, because if something goes wrong you don't have anyone to help you. How do you find your way to an eye wash when you can't see?

    A freshman lab manual from any college bookstore will give you an idea what some simple experiments are, and what you learn from them. Reading through one would be a good place to start to figure out what you would want to try. But, it's still best if your assisted somehow. And I won't recommend anything to do on your own...

    There are some people who need to actually see something happen in order to believe it's true or let it sink in, and that's where lab work really helps learning. But, the number of people I've seen cut themselves, spill stuff, or start accidental fires pretty much tells me, it's best to do in a lab, with an instructor. At least the instructor knows the risk of each experiment, and knows what to do when things go wrong.

    The goal of chemistry lab classes is more to teach good lab techniques and lab safety. Learning chemistry in the lab is only a secondary benefit, most of the learning actually comes from books and lectures. It's the physical skills of handling materials that's learned in lab, and without instruction there isn't much learning you can do on these skills on your own.