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?
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]