256 posts tagged with chemistry.
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Propane grills with less-than-high-grade propane?

Is my propane grill going to work if the gas supply isn't up to U.S. standard? [more inside]
posted by phantroll on Jun 11, 2009 - 5 answers

The answers always fade too soon.

Why does UV make things fade? [more inside]
posted by dmd on Jun 9, 2009 - 12 answers

Is espresso hot chocolate impossible?

Chocolate espresso - impossible? I want to make espresso hot chocolate, but after reading up it seems as though it's not doable. At all. Am I right? [more inside]
posted by goo on Jun 6, 2009 - 23 answers

Pardon me, but do you speak chemistry?

Looking for a chemistry wizard to help me translate this ad. [more inside]
posted by neurodoc on Jun 2, 2009 - 18 answers

Molecular cartography - how's it done?

What techniques do chemists use to map the molecular structure of a substance?
posted by shivohum on May 31, 2009 - 15 answers

What is a gel that turns to liquid with minor agitation?

What do you call a gel that turns into a liquid with very minor agitation/pressure? [more inside]
posted by Bugbread on May 30, 2009 - 10 answers

Flavor tome?

What are the main basic references on the art & science of flavor creation? [more inside]
posted by gorgor_balabala on May 25, 2009 - 6 answers

Attention chemists and nurses.

What chemical did I inject into myself, and will I be okay? [more inside]
posted by lostburner on May 21, 2009 - 14 answers

You've got something on your head there

I've just poured myself a Dark Horse Brewery Tres Blueberry Stout. A slow, steady pour that left a modest head on top. And then a droplet or two skidded around over the foam like a water droplet on a hot frypan for maybe five seconds before disappearing. Darndest thing I've ever seen. Beer geniuses, how did this happen? How can I make it happen again?
posted by ardgedee on May 15, 2009 - 6 answers

Laser printing and inkjet techology filter

How do laser and inkjet printers work? I know the basics, of course, but I am looking for serious expertise at the level of the actual chemistry and physics... things like fuzer specs, toner chemistry, deposition, transfer, particle masses, exotic materials; in short... the stuff an actual expert would know. [more inside]
posted by FauxScot on May 7, 2009 - 5 answers

It's Alive!!!!

I have sulfuric acid, de-ionized water, and basic lab equipment. Can I revive my crappy car battery? [more inside]
posted by scose on Feb 23, 2009 - 18 answers

How bubble is formed?

By what process do air bubbles form in water? [more inside]
posted by metastability on Feb 21, 2009 - 13 answers

How to test silver items

I want to test the silver content of some items. What should I buy? I see people offering silver testing kits on Ebay. Are these a good choice, or would I better off buying the reagents themselves? If so, which ones?
posted by Joe in Australia on Feb 16, 2009 - 5 answers

the green fairy's cousin

why does pernod turn milky when water is added? [more inside]
posted by mwhybark on Feb 14, 2009 - 7 answers

Methanol will make you blind. The antidote is ethanol. Drink hard liquor if you can't get to a hospital.

Good resources for rules-of-thumb for laboratory dangers and chemical safety? [more inside]
posted by you're a kitty! on Jan 26, 2009 - 13 answers

What are some interesting ways to teach the periodic table to 10th and 11th grade students?

What are some interesting ways to teach the periodic table to 10th and 11th grade students? [more inside]
posted by chr1sb0y on Jan 25, 2009 - 13 answers

Just watched a very disturbing documentary, how scared should I be?

Just watched a very disturbing documentary, how scared should I be? [more inside]
posted by querty on Dec 28, 2008 - 21 answers

A (3D) Model Education

ChemistryFilter: How can I use a molecular model that was given to me to learn about the wonders of chemistry? [more inside]
posted by PaulingL on Dec 28, 2008 - 9 answers

Need help on solving pkas, concentration

I apologize for posting such a specific question: I have an ionization scheme with 3 different pKas. I can figure out, using Henderson Hasselbalch, the hypothetical concentration of two of them. But my research adviser wants to know the concentration of all the structures in solution. And I don't have the math skills for that. [more inside]
posted by geronimo's folly on Dec 17, 2008 - 3 answers

Can mold grow on food packed in oil?

Can mold grow on food packed in oil? [more inside]
posted by aws17576 on Dec 14, 2008 - 10 answers

Aluminum foil turned brown; should I be worried?

I made (delicious!) mashed sweet potatoes in a conventional stove-top pot, covered the pot with Reynolds aluminum foil, then put it in a still warm but off-position oven (simply to save stove-top and counter space for the moment while wanting it to stay at room-temperature). Retrieving the pot a few hours later, I found that the inner surface of the foil had turned a light brown. It was also moist from the condensation, but had remained clean, unoiled, unburnt. I've cooked quite a bit and never seen this. What could be causing such discoloration, and is it a worrying symptom (of, say, toxins in the foil)? [more inside]
posted by taramosalata on Dec 14, 2008 - 6 answers

Bond angles

According to Wikipedia, the bond angle for water is precisely 104.45 degrees. How do they get that number? And how would one experimentally verify it? [more inside]
posted by metastability on Dec 14, 2008 - 16 answers

Is a BS worth spending another year in school?

I'm working on a BA in chemistry, with a concentration in biochemistry. Compared to getting a BS, will it be harder for me to find a job when I graduate? If so, how much harder? [more inside]
posted by pullayup on Oct 28, 2008 - 13 answers

How to change the brightness on a Varian SpectrAA 55

Chemist-Filter: I am an analytical chemist working for a company that specializes in leaching semi-precious metals out of waste material. The display on our Varian AA (atomic absorption) Spectroscope is too dark. Can it be fixed without calling in our repair/maintenance technician? All information is appreciated. [more inside]
posted by mrw on Oct 9, 2008 - 5 answers

What the heck am I qualified for?

I'm planning on leaving my high-pressure hard science PhD program for something that won't make me hate life quite so much. The problem is that I really don't want to go back to biotech/pharma industry, especially without a PhD, unless totally necessary to support my family. So what am I good for? [more inside]
posted by anonymous on Sep 17, 2008 - 10 answers

Help me make the Beeriodic Table

I'm looking for beers that correspond to elements on the periodic table. Arsenic (As) = Asahi, Titanium (Ti) = Tiger, Potassium (K) = Kingfisher, and so on. I've got a lot of gaps- please help! [more inside]
posted by twirlypen on Sep 16, 2008 - 78 answers

Help me keep my hands off him!

We had our first date last week and the chemistry was incredible (as was the kissing). However, I want to find out if there's more than just the physical here. Our second date is Thursday evening - how do I keep myself under control? [more inside]
posted by shiny blue object on Sep 3, 2008 - 20 answers

dook day farmage?

What's a good cheese-making book for me? [more inside]
posted by cmoj on Aug 13, 2008 - 4 answers

Ask a chemist - cooling CO2

A question for chemists - I am doing a calculation about the energy requirements of taking CO2 at atmospheric pressure and temperature and compressing it to 2 MPa (2000 kPa, about 300 psi) and cooling it to -31ºC and am a bit uncertain about handling the phase change from gas to liquid. [more inside]
posted by gspm on Jul 24, 2008 - 7 answers

What could a high school chemistry teacher do with $5000? (besides buying computers)

What could a high school chemistry teacher do with a $5000 technology grant? (The grant restrictions state that it cannot be used to buy computer hardware or fund after-school programs or summer projects.) [more inside]
posted by chr1sb0y on Jul 22, 2008 - 18 answers

What is a dense/heavy transparant oil or inert/safe non-water-based liquid?

I need a crystal-clear transparent liquid that is as heavy (dense) or heavier than water, not dangerous, and not difficult to obtain. The heavier the better. The catch - it can't be water-based. [more inside]
posted by -harlequin- on Jul 18, 2008 - 23 answers

At what "proof" will spirits burn?

At what "proof" will most spirits burn? [more inside]
posted by eduke on Jul 1, 2008 - 10 answers

How can I determine the width of one molecule of a substance?

What is the width of a single molecule of Tartrazine? Brilliant Blue FCF? [more inside]
posted by jwells on Apr 18, 2008 - 6 answers

cliff's notes for college?

i want something sort of like this, only more to my liking. recommendations, please. [more inside]
posted by gcat on Apr 17, 2008 - 4 answers

What does nylon 6 decompose into when heated?

What does nylon 6 decompose into when heated?
posted by 517 on Apr 7, 2008 - 4 answers

The more you know

How has our understanding of Astronomy, Biology, Chemistry, etc. changed in the last five years? [more inside]
posted by Orange Pamplemousse on Mar 24, 2008 - 15 answers

Danger! Water contains high levels of hydrogen.

WTF is up with this sign? [more inside]
posted by Mcable on Mar 2, 2008 - 14 answers

Water Boiling Point Question

At what air pressure will water boil around 65 Degrees farenheight? [more inside]
posted by GregX3 on Feb 27, 2008 - 13 answers

Chemistry Peeps: Help my distillation please.

I'm doing research in prep for some small batch distillation of corn liquor/moonshine. (For educational purposes only.) Very specific question inside. [more inside]
posted by snsranch on Jan 23, 2008 - 28 answers

Density? I'm dense.

Is there a chemical explanation for the density of an element or is it simply an innate physical characteristic? [more inside]
posted by beta male on Jan 21, 2008 - 14 answers

The mass of neutrons versus protons? The existence of matter?

Why do neutrons have more mass than protons? [more inside]
posted by bookish on Jan 16, 2008 - 30 answers

Any chemists know what I made?

What the heck did I make? [more inside]
posted by geekhorde on Jan 10, 2008 - 13 answers

Where to buy models of molecules?

What is a bricks-and-mortar store at which I could buy a set of model elements / bonds - the molecule model things that students use as they are learning organic chemistry? [more inside]
posted by Chanther on Jan 7, 2008 - 14 answers

lead lead everywhere

California has a new law that specifies limits for lead in jewelry products. Even though the answer to my question should be a no-brainer, I need to confirm: [more inside]
posted by edjusted on Dec 21, 2007 - 10 answers

Help a first-time tutor get started!

FirstTimeTutorFilter: I'm plan to start tutoring Math, Chemistry, Physics and possibly ESL in January. Only problem is, I have *no idea what I'm doing*. Anyone have any textbooks, general teaching books, online certification courses, etc to recommend? [more inside]
posted by anonymoose on Dec 17, 2007 - 8 answers

Why do sugars like to cyclize in solution, thermodynamically speaking?

What is the correct thermodynamic explanation for the fact that all monosaccharides with 5 or more backbone carbon atoms occur predominately in their cyclic form in solution?
posted by perissodactyl on Dec 12, 2007 - 5 answers

Re-colorable clothes

ChemistryFilter: What chemicals are out there that can stain a t-shirt, but then be quickly dissolved with a chemical? Bonus points: Chemicals are safe enough for compost heap, and won't dissolve in a washing machine. [more inside]
posted by mccarty.tim on Dec 3, 2007 - 8 answers

Dust spots? Water marks? Crud on film?

Why am I getting blotches on my black and white negatives? What are the marks? Are they dust? Water spots? How do I fix this? [more inside]
posted by Geckwoistmeinauto on Nov 28, 2007 - 13 answers

Should I have learned this in high-school Chemistry?

Chemistryfilter: I'm looking for a solution (colliod? emulsion? gel? resin?) of a few inexpensive and non-dangerous ingredients whose composition can be adjusted to create a melting point near to room temperature (and moderate pressures). [more inside]
posted by newdaddy on Nov 6, 2007 - 21 answers

Study helps for chemistry/biology?

What are some good free online study guides/helps for Chemistry and Biology?
posted by macsigler on Nov 3, 2007 - 5 answers

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