Recent content by Nemus

If you are not a professional chemist with access to a professional lab this is not something you should try. It is a about as corrosive to living tissue as anything can get.

How about the sodium salt of the butylbarbituric acid?

MnCl2 is never green. Mn(V) ions are...

Yes, nifedipine, a calcium channel blocker for blood pressure regulation.

Good argument. Symmetry is sufficent. Thanks. Cool idea with the induction. I am tempted to bring out my hammer... There would be a local eddy current in the twist for sure but I don't think there would be a global current. A gigant Moebius strip in sitting above the equator of Earth for example.

and the argument goes as follows...

I have worked with many types of magnets. Critical is the volume of the required field. If it is just a few mm^3 you may get away with a permanent magnet with a focusing pole piece. If you need more like some cm^3 we're talking about electromagnets, power hungry, big, unstable. If you need cm3...

Here is something that keeps me up at night...Assume a Moebius strip with mass m and radius r. Let the twist rotate but not the mass of the strip in general. Would it have an angular momentum? If yes, what would it be?

A bit trivially, a macroscopic magnet would have spins of the order of 10^23 or so. Just addition of many electronic spins. Otherwise I think the 11/2 spin is for the dysprosium 3+ ion.

Phase of what? You are of course correct that the energy-time pair is different. Very useful though.

I have been trying to figure out other pairs of variables in Heisenberg's uncertainty relationship apart from the well known position-momentum and time-energy pairs. I am particularly interested in electric fireld strength and magnetic field strenght. The reason for my interest is that if I...

That is a very strong statement for the behaviour in such an exotic medium. I would be surprised if all nitrates are highly soluble in concentrated (or strong) nitric acid. Compare with the effect of concentrated sulfuric acid on steel (none) because the iron sulfate is insoluble in the acid.

Well, concentrated HNO3 is hardly aqueous. There is very little free water around actually so even if I don't dispute that sodium salts generally are more soluble than calcium salts I think we are dealing with surface reactions in both cases. Since surface reactivity is often dominated by...

I agree with Borek but to expand a bit on the subject; if you put aluminum in base where the amphoteric oxide (actually the hydroxide) gets ionized to aluminate ions, which are soluble and leaves the surface, it reacts like crazy.

I am not sure that I should put more fuel onto this fire but, since I have tried this in real life first in an accident ( I coose calium carbonate because it was in a sack next to me) and then playing with it later, I think I'll say it anyway. I think calcium carbonate is the better choice...