This is one of the syllabus points in the IB syllabus 12.1. We are advised to use the formula for the energy to remove one electron: $$E = hν$$ which apparently is the same as $$E_2 - E_1$$ where $E_2$ is the energy of the convergence limit and $E_1$ is the energy of the energy level where yo...

I had this car battery that flipped in my car trunk. When I got it out of there it spilled some acid on the pavement. It's a sulfuric acid battery. I added some baking soda on it and poured some more water+baking soda to make sure the acid was neutralized. However there is still a brown-rusty st...