Recent content by Borek

Perhaps we understand the word levitate differently - for me it means it doesn't move at all. It has to be lifted first, but than it just stays in a position.

There are two phases - lifting, levitation. Work done during the lifting is mgh. There is no work done during the levitation, as the book doesn't move (force × displacement = 0).

This^

You are just making this out, this is not how acids react with organic matter, at least not in 99% cases.

Apart from more or less obvious environmental hazards related to use of all substances mentioned - you never said what is the concentration of NaOH/HCl, and that's the most important thing here. If they are too concentrated, they just destroy plant tissues (you could use torch as well). If they...

Plus people are afraid of them, as they are a known vector for spreading trojans/viruses etc. (not to mention things like USB killer). People are even afraid of video games that emulate attaching flash drives. This is a constant problem I see since I published The USB Stick Found in the Grass...

CD/DVD drive is getting obsolete, quick check suggests just around 14% laptops offered have it (and mobile devices don't have them at all).

Problem is not with writing and publishing, problem is in getting audience/marketing. Selfpublishing these days is trivial - basically if you have pdf, they'll print it in any number of copies (sure, there are things to consider). Just remember there is plenty of services offering help, but at...

No misunderstanding here. For one-off sales I (almost) always tell them I send the registration key after the payment clears out (so technically they pay up front), so that's not an issue. What baffles me is that they never ask about HOW to transfer money after they get the invoice, which...

My English fails me. If you don't know: one of the things I am doing is selling chemical software - you download the program from my site, you pay with a credit card for the license, you get the registration key. You can also buy paying with a bank transfer. This is a third or fourth time I am...

First hit when I google: https://en.wikipedia.org/wiki/Dipole#:~:text=Permanent%20dipoles,is%20called%20a%20polar%20molecule.

If the molecule has a permanent dipole, it can participate in pd-pd bonds, if it doesn't have the permanent dipole - induced dipoles is the only thing it can count on.

As if it was ever a problem to buy illegal drugs. I am not an organiker, so I am not going to pretend I know for sure, but my understanding is that fentanyl is easier to synthesize than many other abused substances.

Difference between yellow and brown is mostly just intensity, these are not completely different colors. Especially when you take into account that these names of colors are very handwavy, there is no rigor behind. The only way to treat these things seriously is to talk not about "colors" but...

General idea is OK, whether some H2O molecules are not replaced with Cl-, producing a bit different complex, is another question. It is yellowish/brown even in low pH solutions, where the conjugate base is not present.