277 posts tagged with chemistry.
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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

It's So The Man Can See Your Weed

UnFilter(ed): What's the deal with transparent rolling papers? [more inside]
posted by BitterOldPunk on Oct 19, 2007 - 8 answers

Your Experiences with Online Dating Services?

Have you used Chemistry.Com? eHarmony? Match? Etc.? [more inside]
posted by WCityMike on Sep 20, 2007 - 48 answers

Stop the maddness.

Isn't "Tea Tree Oil" merely fancy marketing-speak for turpentine from a specific type of tree?
posted by Fupped Duck on Aug 1, 2007 - 6 answers

Bleach doesn't always work?!

I sat in bleach. Why didn't it turn my chair white? [more inside]
posted by rossmik on Jul 12, 2007 - 4 answers

Advice for starting a tenure track science job.

NewAcademicJobFilter: What did/should you do, to start off a new academic job at a new institution and do it right? Lab? Colleagues? Students? People to know? Actions to take? How did you leave your own institution? [more inside]
posted by lalochezia on Jul 3, 2007 - 6 answers

Help me with this Organic Chemistry doozie.

Organic Chemistryfilter: In H NMR spectroscopy, why is it that as a carbon is more substituted, it is also more shielded? Better explanation inside. [more inside]
posted by Paul KC on Jun 20, 2007 - 9 answers

Test for presence of blood

For obscure journalistic reasons, I need to determine whether a sample of liquid contains blood. [more inside]
posted by johngoren on Jun 1, 2007 - 11 answers

Ion Exchange

I'm looking for a source for ion exchange resin membranes. [more inside]
posted by killermac on May 21, 2007 - 5 answers

For want of a U-Tube

My lab is running low on U-tubes...what can I use in place of a U-tube/porous cup for a salt bridge in a voltaic cell? [more inside]
posted by The Coach LD on Apr 22, 2007 - 11 answers

How can I find a legendary "formula" for an A-Bomb and not be put on a terrorist watch-list in the process?

How can I find a legendary "formula" for an A-Bomb and not be put on a terrorist watch-list in the process? [more inside]
posted by Becko on Apr 11, 2007 - 13 answers

how did i give myself this freckle?

is there a chemical that can permanently stain skin brown, or induce a freckle? [more inside]
posted by thinkingwoman on Apr 8, 2007 - 16 answers

How much to charge for tutoring?

What is the going rate for one-on-one tutoring in chemistry? [more inside]
posted by janell on Mar 19, 2007 - 10 answers

Why do orange chicken vapors make me cough?

This question is about chinese fast-food orange chicken (the deep-fried amorphous nuggets with a thick tangy glaze). When I take a deep smell from a hot bowl of this chicken, or hold it in my mouth and breathe around it, some sort of irritating vapor makes me cough (or stings my nose). Just one cough – enough to keep it from getting into my lungs. Once the chicken cools down (to mouth temperature, even) it doesn't happen. It reminds me of the reaction I've had sniffing acid in lab – could it be lots of volatile vinegar? I've experienced this with fast-food chicken in more than one college food court.
posted by lostburner on Mar 8, 2007 - 20 answers

How can I test mail-order medications for purity?

Is there an easy, inexpensive way to check if the meds I order from overseas by are real? For example, would the solution linked below be something a total novice could do? How could I actually learn the process? (and please, no lectures on whether ordering from overseas is good idea. That's what I'm trying to find out.) thanks.
posted by soulbarn on Mar 2, 2007 - 10 answers

A Problem of Scale: Halfway in size between an atom and the universe

"A human is halfway in size between an atom and the known universe"... This is a paraphrased quote I have come across several times. I like it. Who said it first? How true is it in the most literal sense? And, finally, what errors arrive in postulating a universe, or an atom, which can be measured AT ALL from our singular, relativistic, perspective? [more inside]
posted by 0bvious on Feb 18, 2007 - 14 answers

Ugly discharge equals ugly bubbles.

Bath bubbles change in the presence of a yeast infection. Why? [more inside]
posted by kmennie on Feb 7, 2007 - 7 answers

Is chemistry really that important?

I've been seeing a great guy. He's sweet, smart, funny, and he likes me! So what could possibly be the problem? [more inside]
posted by different on Jan 17, 2007 - 26 answers

Is burning silica gel dangerous?

Last week at a friends house we were sitting around a nice fire, when my brother found one of those silica gel packets, and (stupidly) threw it in. The room almost immediately filled with noxious fumes, and our throats hurt for a couple days afterwards. What happened when that silica burned, and was any permanent damage done?
posted by splatta on Jan 11, 2007 - 8 answers

Mead-making and measuring alcohol content

Measuring alcohol content without a hydrometer? [more inside]
posted by Blazecock Pileon on Jan 10, 2007 - 8 answers

Better soup-making

SoupFilter: Why do soups taste better after aging? [more inside]
posted by Blazecock Pileon on Nov 25, 2006 - 8 answers

Sugar sugar, ah honey honey

Chemistry and flavour: Do all sugars taste sweet? Are there substances that are sweet tasting that are not sugars/carbohydrates? [more inside]
posted by winston on Nov 19, 2006 - 12 answers

Identify this mix of chemicals

Attention chemists: I am seeking to identify a product that contains a list of ingredients that strikes me as fairly odd. [more inside]
posted by sindark on Oct 3, 2006 - 15 answers

mean and median differences?

In a least squares regression model what does it mean when the median is larger than the mean? [more inside]
posted by EvilKenji on Sep 25, 2006 - 13 answers

Online Chemistry degree

Is anyone aware of an American University that offers an online Chemistry Degree (BS or BA). Thanks [more inside]
posted by Noodles on Aug 14, 2006 - 5 answers

Looking for a super-stylized periodic table

Calling designers: I'm looking for a really stylized periodic table of the elements! [more inside]
posted by neilkod on Aug 1, 2006 - 33 answers

Can I get rid of the alcohol in a tincture?

Here's one for all the chemistry majors out there. I'm going to be making an herbal tincture using Everclear as the solvent. After the tincture has been made, is it possible to get rid of the alcohol by heating the solution gently in a double boiler without affecting the potency of the tincture? [more inside]
posted by TorontoSandy on Jul 13, 2006 - 13 answers

Pins and Needles: Why?

What is the underlying physiological cause for paresthesia (tingling of the fingers) secondary to hyperventilation? Specifically, what metabolic or neurological process causes you to feel tingling in your fingers when you hyperventilate?
posted by scrump on Jun 30, 2006 - 2 answers

Ethanol's pros and cons

How much does an x% ethanol gasoline blend product reduce mileage? Does the environmental benefit from ethanol blends outweigh the increased consumption of gasoline products? Or is the benefit negligible for the consumer? [more inside]
posted by Blazecock Pileon on Jun 19, 2006 - 12 answers

Chemical Equation for Syphilis

I found this chemical equation on the wall of a men's room in a bar last night. What is it? More importantly, why would someone write it above a urinal at a bar?
posted by nomad on Jun 10, 2006 - 15 answers

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