I would like to know if this statement is scientifically correct, or if it's hyperbole, or if it's basically correct but requires qualification: "Most of the atoms that formed your infant body at birth are now dispersed, as your present atoms will be again, if you have the good fortune to live a few more years on this oxygen-rich planetary home." [more inside]
This recipe recommends dry frying salt "at low heat for about 10 minutes until it turn a brownish color". Would this actually change the salt at all? [more inside]
I'm looking for books that either explain concepts in physics or encourage an interest in physics topics that are likely to be accessible and interesting for ~13 year old girls who are keen on science. What are the contemporary equivalents of "A Brief History of Time" and "Einstein's Dreams" for kids today? Related fields are welcome. [more inside]
My niece isn't doing so well in chemistry (read, a point away from an F) and I need to help her. However, it's been a long time since I've done chemistry, and I can't exactly hop back in. Does anyone have any resources for chemistry that would help me learn and help me explain things to her? Also, general studying resources appreciated as well. She has no skills, and it's now or never! [more inside]
Hello I am a lady in her late 30s and until 3 weeks ago, in a long-term relationship (12 years). We were not married and had no kids, and lived together for a decade. My ex and I shared a deep understanding, laughs and interests, and I thought this was enough until I met a younger guy a few months ago, for whom I immediately felt a crazy infatuation. [more inside]
What on earth is this item of chemistry glassware for?
[ChemFilter, asking for a teacher friend] I'm designing an exercise on the heat released in the decomposition of trichloroisocyanuric acid (aka Symclosene) but I'm missing a crucial piece of information! [more inside]
how is benzonitrile less soluble than methylbenzene? I'm baffled [more inside]
My pillbox is gross, and it seems to be coming from a pill. What the heck? [more inside]
I mixed milk of magnesia (magnesium hydroxide) and pickling salt (calcium chloride) together and was very surprised when the glass suddenly heated up. I haven't taken a chem class in 12+ yrs and I can't figure out what the exothermic reaction was that I inadvertently made. Any chemists out there to shed some light?
For a book I am ghostwriting, I'm researching how a Mars colony might support itself. Perchlorates in the martian soil can be refined out to produce solid rocket fuel. My question is -- how would the stuff be manufactured? [more inside]
My neighbor believes I am killing his lawn by emptying small amounts of pool water into a pond on my property which borders his property. I do wish he would stop yelling at me. How much pool chemistry (say, calcium hypochlorite) would I need to add per gallon to my pool to damage his lawn? [more inside]
One of my chemistry courses this semester requires that I use a non-programmable, scientific calculator on all exams. Do you know of any multi-line calculators with a similar keypad to my TI-84+ Silver edition? A lot of the calculators I've looked at on Amazon appear to be of the 2-line variety; the ones that have 4-lines don't have the ability to take inverse logs or to create custom-defined exponents. It'd be really nice to have as large a display as possible; money is no issue.
I need to ace a cumulative general chemistry 1 test on Wednesday. It's worth a huge portion of my grade. Cramming (in the traditional sense of the word) is pretty much inevitable as it is a summer class so a shitload of information had to be covered in a few weeks. What should I do for the next 24-32 hours? How little sleep can I get away with the night before the exam? P.S. I have ADHD [more inside]
My SO and I were having some italian-themed chicken wings, and had some fresh-grated parmesan cheese on the side in a copper bowl. After our meal, we were cleaning up and transferring the leftovers to the fridge for storage, and the cheese on the bottom of the bowl had turned a light blue. Does anyone know why this happened? Given that it happened over only a few hours to just the cheese in contact with the bowl, I'm thinking it was some kind of reaction with the copper.
How would a graduate chemistry student distinguish themselves as more gifted than their classmates? [more inside]
Are there unpleasant compounds in plastic (specifically Britta filters) that are soluble in pure ethanol that I don't want to drink? [more inside]
Solutions of baking soda (sodium bicarbonate) and potassium metabisulfite in water are both slippery to the touch. Why is that?
Help me go from good to great in my general chemistry course. [more inside]
Chemistry lab safety: Is the teacher at fault or am I overreacting? [more inside]
Intermolecular forces questions: Why do H-S-S-H molecules have dipole-dipole attractions to eachother? Why does ion-dipole attraction make for a stronger solute-solvent interaction than hydrogen bonding? [more inside]
Help forgetful me locate this red, science-heavy cookbook! [more inside]
How are American Chemistry textbooks different from international ones? [more inside]
How do I identify the metal from which that this nameplate is made? It's from a WW2-era lathe. Is behaves somewhat like lead, but is harder. [more inside]
Homemade popsicle filter: why does melted popsicle taste better than frozen popsicle? [more inside]
Why is my lemoncello cloudy? When I combine the simple sugar and the lemon infused alcohol, both of which are very transparent (although one is a luminous yellow) the resulting mixture becomes instantly cloudy. Can anyone explain why? For bonus points can you suggest a way to minimize this? [more inside]
Can one sell a chemical over the internet if its not a precursor to meth or an ingredient in explosives? What regulatory and legal issues are there? [more inside]
Does compressed oxygen burn? Or do only objects IN compressed oxygen burn? Please settle this dinnertime discussion...The hubs and the daughter's boyfriend need to be told which one of them is right. Thanks!
How come sulphur hexaflouride is an extremely potent greenhouse gas when it's much heavier than air? [more inside]
I know *what* an azeotrope is, but I don't really know *why* an azeotrope happens. Please enlighten me. [more inside]
Hydrogen peroxide + baking soda = ???? [more inside]
Help me understand hair care chemistry. When I look at the list of ingredients on bottles of conditioner, what ingredients should I avoid. I can't stand the 'waxy' feeling I get from some conditioners. My old favorite standby conditioner changed formulas recently and it now has the dreaded waxy ickiness. NOT looking for specific product recommendations, only for ingredients to avoid or possibly ingredients to look for. [more inside]
Should I use warm or cool water when I fill an ice cube tray to freeze? [more inside]
Would a drug-manufacturing machine be legal? [more inside]
I am looking for a torch to melt pyrex (borosilicate glass). [more inside]
What are the best academic journals in each field? [more inside]
my mother used to put a few drops of hydrogen peroxide in milk to keep it fresh past the 'use by' date. it appears to work. very well. what's the chemistry behind this? and should i drink it?
Please help me really grok chemistry. [more inside]
hotdogfilter - Why do BallPark Franks plump when you cook them? [more inside]
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?
PeeChemistryFilter: what the hell is going on here? [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]
why does pernod turn milky when water is added? [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]
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