What does nylon 6 decompose into when heated?
How has our understanding of Astronomy, Biology, Chemistry, etc. changed in the last five years? [more inside]
At what air pressure will water boil around 65 Degrees farenheight? [more inside]
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]
Is there a chemical explanation for the density of an element or is it simply an innate physical characteristic? [more inside]
Why do neutrons have more mass than protons? [more inside]
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]
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]
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]
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?
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]
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]
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]
What are some good free online study guides/helps for Chemistry and Biology?
UnFilter(ed): What's the deal with transparent rolling papers? [more inside]
Have you used Chemistry.Com? eHarmony? Match? Etc.? [more inside]
Isn't "Tea Tree Oil" merely fancy marketing-speak for turpentine from a specific type of tree?
I sat in bleach. Why didn't it turn my chair white? [more inside]
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]
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]
For obscure journalistic reasons, I need to determine whether a sample of liquid contains blood. [more inside]
I'm looking for a source for ion exchange resin membranes. [more inside]
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]
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]
is there a chemical that can permanently stain skin brown, or induce a freckle? [more inside]
What is the going rate for one-on-one tutoring in chemistry? [more inside]
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.
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.
"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]
Bath bubbles change in the presence of a yeast infection. Why? [more inside]
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]
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?
Measuring alcohol content without a hydrometer? [more inside]
SoupFilter: Why do soups taste better after aging? [more inside]
Chemistry and flavour: Do all sugars taste sweet? Are there substances that are sweet tasting that are not sugars/carbohydrates? [more inside]
Attention chemists: I am seeking to identify a product that contains a list of ingredients that strikes me as fairly odd. [more inside]
In a least squares regression model what does it mean when the median is larger than the mean? [more inside]
Is anyone aware of an American University that offers an online Chemistry Degree (BS or BA). Thanks [more inside]
Calling designers: I'm looking for a really stylized periodic table of the elements! [more inside]
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]
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?
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]
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?
Why is Hydrogen inflammable? And not Helium? [more inside]
If a guy is not a player why would he continue to frequent a dating site a month into what seems to be a pretty good relationship for both of us? [more inside]
When I pour sugar in my coffee the total volume in my mug increases. What happen to the volume when the sugar dissolves (decreasing or stable ?) ?
Calling all Organic Chemists! Please help me with my next tattoo! [more inside]
Is melatonin present in the brains of other mammals, specifically dogs? Does it serve the same function? How unique or not unique is the brain chemistry of humans?