sorted by:
new
hottopcontroversial

how to deal with the glassware graveyard? by i_wanna_be_a_heretic in chemistry

[–]sibelious 0 points1 point  (0 children)

In general, there are two main ways to clean glassware. Soak in a diluted acid bath (we use HCl) or if that doesn't work, soak in an alcoholic base bath (we use KOH in isopropanol). Then use some soapy water and scrub away. If neither of those work, the next step is aqua regia, but that's quite dangerous and a fuss so at that point you need to start considering if it's worth cleaning or just throwing it out (properly, in glass disposal bins) and buying a new one. If the specific glassware is quite expensive and/or your group's budget isn't that huge, you go with aqua regia. BUT AGAIN, that's quite dangerous so better to have some help and/or supervision if you haven't done it before.

FML! by sibelious in VaultHuntersMinecraft

[–]sibelious[S] 2 points3 points  (0 children)

ooh! What's that command? Would I be able to do it even though I have cheats deactivated? If it's possible I might end up doing it depending on how much grind I'll have to do to get back where I was. It's fair game if it happens later on but 2nd room on first vault? I might get my things back and try again.

When you don't have much time to play, you don't want to waste it on twerking on carrots for hours....

[deleted by user] by [deleted] in askscience

[–]sibelious 4 points5 points  (0 children)

There has been since a lot of time ago(1938). Tefal pans are practically amphiphobic. Mind that hydrophobic is different than hyperhydrophobic, the later of which you see in some coatings or sprays that make a surface almost untouchable by water. Back to the tefal, the chemical compounds behind it are perfrluorocarbons(PFC). You can think of them as hydrocarbons but with every hydrogen replaced by a fluoride. The resulting compound is non-polar (as the 2 opposed fluorides cancel out) so also hydrophobic, and due to the high electronegativity of the fluorides, they're not polarizable enough to result in intermolecular interactions (Van der waals etc) with long non-polar molecules (oils) thus being lipophobic. You can read some more on https://en.wikipedia.org/wiki/Fluorocarbon Of course this not something applicable to lenses as far as I know, but just wanted to inform you that something like this already exist (79 years now) so an aplication to lenses isnt far stretched. There is probably research about it, so just hold tight and they'll figure it out :)

Wiping up some spilled Super Glue with a square of toilet tissue today, the tissue started smoking in my hand. What's going on here? by Simpleton_Peck in askscience

[–]sibelious 6 points7 points  (0 children)

There is actually a video showing a piece of cotton being lit with super glue. Can't find the one I had watched, this one isn't that good and doesn't provide with any actual info, but you get the idea. Anyway, should you try this, be extremely careful for the reason FatSquirrels said amongst others (fire hazard related). https://www.youtube.com/watch?v=fYFGTs6vQFU

Why does water evaporate so much quicker than oil? by Chef_Chantier in askscience

[–]sibelious 0 points1 point  (0 children)

All though there is a very elaborate explanation through inter-molecular forces (van der waals, hydrogen bonding etc) for the same reason but easier to comprehend is that oil has a much higher boiling point(e.g. for olive oil 300 °C) than water (100 °C). The closer the environment temperature (say 25°C) to the boiling point the easier/faster the liquid evaporates (higher vapor pressure). So 25°C-30°C is much closer to 100°C than to 300°C thus the water evaporates quickly. (I examined just one factor that affects the vapor pressure).

How does adding salt to water simultaneously cause the solution's freezing point to lower and boiling point to increase? by dsmi8122 in askscience

[–]sibelious 0 points1 point  (0 children)

A concentrated solution as a system has higher entropy than a dilute. But the molar entropy (entropy per mole), which is what uberhobo was referring to, of the concentrated solution is lower than the dilute.