Episode #125 of the Stack Overflow podcast is here. We talk Tilde Club and mechanical keyboards. Listen now

# Tag Info

6

Vitamin E acetate, or α-tocopheryl acetate, exists in two forms: D-form (solid/highly viscous at 20 °C) and a racemate (viscous liquid at 20 °C). Interestingly enough, the difference in physical properties is well denoted in German Wikipedia article, whereas English Wikipedia omits this. Also, I noticed many authoritative sources arbitrarily listing a ...

1

Safe in context of chemistry, physiology or long term health care prevention ? With zero knowledge, it is safer to stay with commercial products, until you know, what you are doing. For mouthwash, calcium carbonate is quite ineffective, being insoluble solid. Better would be solution of sodium bicarbonate ( baking soda ), present in some toothpastes as ...

1

$2\mathrm{p}^6$, $4\mathrm{p}^1$ are not orbitals. It is a partial description of an atom electron configuration, saying there are 6 electrons in 3 orbitals $2\mathrm{p}$, respectively 1 electron in the orbital $4\mathrm{s}$. $2$ in $2\mathrm{p}$ means the (main, energy ) quantum number $n=2$. $n$ can have values 1, 2, ..... $p$ in $2\mathrm{p}$ means the ...

1

It might possibly be intended to dissolve an adherent organic film, such as that left by evaporation of plasticizers from foam packaging. However, it also might well partially dissolve paints and cements used in the lens assembly, leaving yet harder-to-remove dirt on the lens. Unless you have a specific need for those solvents, use distilled water and/or ...

1

I'd expect $\ce{H2O, CO, CO2}$, and $\ce{SO2}$ to be created during the combustion of these compounds. I'd wager a decent amount of $\ce{SO2}$ was created, but was diluted in the atmosphere. Regarding $\ce{H2S}$, maybe it was produced, but then reacted according to the following: $$\ce{H2S + O2 -> SO2 + H2O}$$ Additionally, there were probably a wide ...

1

While as stated in my comment I don't believe this is the reason dogs can detect those substances, every material has a certain permeability for different molecules. https://en.m.wikipedia.org/wiki/Permeation

1

It's not an all-or-nothing situation, where either we can reliably prediction reaction products, or we have not tried to. For instance, drug companies, for many years, have been making extensive use of increasingly powerful, sophisticated, and refined in silico predictive models to choose likely candidates for in vitro testing. And I would be surprised ...

1

Polyurethane is a polymer that's made up of toxic chemicals that react pretty completely with each other during the manufacturing process. While there's always potential that there could be residual unreacted materials, I'd say the risk of exposure to these is very minimal. More important would be to look out for formaldehyde. It's a component in some of ...

Only top voted, non community-wiki answers of a minimum length are eligible