dakoad

Hello! I was confused by the electrode signs in an alkaline hydrogen fuel cell. I know that in a galvanic cell the cathode is positive, but in an electrolytic cell, it's negative. Isn't a fuel cell a galvanic one? Why is the cathode negative? And how do the electrons move after the redox processes? Thanks a lot, Dan.

Thank you to everyone!

Hello! I was reading up about strontium uses, and apparently one of its main characteristics is that it absorbs x-rays very well. Hence I started wondering: what is the mechanism of absorption (even if it is complex) generally? And why is Sr so good at it? Thank you, Daniel.

Thank you very much!

Hello! I was wondering if there exists a form of arrangement of carbon atoms, where it is in a circle with double bonds at both sides of every C atom. Basically, something like a benzene ring, but each C atom, instead of forming 3 bonds with other carbons and 1 with hydrogen, forms a C=C bond on each side of it. Thank you, Daniel.