My shower (an in-stall water heater) sometimes smells like something rubber is burning. It's a strong acrid smell that I only notice while in the shower and usually only after a sweaty workout. There is no sign of smoke like you would expect with burning rubber. Is this just some sort of weird sweat and treated water chemical reaction? Anybody heard of something like this?
Physics/chemistry/tire tread composition filter. Why does adding silica to the rubber compound in a tire tread reduce rolling resistance? [more inside]
PeeChemistryFilter: what the hell is going on here? [more inside]
What combinations of colourless non-toxic substances result in something that's coloured, or at least opaque? [more inside]
Is my propane grill going to work if the gas supply isn't up to U.S. standard? [more inside]
Why does UV make things fade? [more inside]
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]
What techniques do chemists use to map the molecular structure of a substance?
What do you call a gel that turns into a liquid with very minor agitation/pressure? [more inside]
What are the main basic references on the art & science of flavor creation? [more inside]
What chemical did I inject into myself, and will I be okay? [more inside]
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?
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]
I have sulfuric acid, de-ionized water, and basic lab equipment. Can I revive my crappy car battery? [more inside]
By what process do air bubbles form in water? [more inside]
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?
why does pernod turn milky when water is added? [more inside]
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]
What are some interesting ways to teach the periodic table to 10th and 11th grade students? [more inside]
Just watched a very disturbing documentary, how scared should I be? [more inside]
ChemistryFilter: How can I use a molecular model that was given to me to learn about the wonders of chemistry? [more inside]
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]
Can mold grow on food packed in oil? [more inside]
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]
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]
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]
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]
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]
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]
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]
What's a good cheese-making book for me? [more inside]
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]
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]
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]
At what "proof" will most spirits burn? [more inside]
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?