1.I know that there are different kinds of chemical reactions, like exothermic and endothermic reactions where electromagnetic radiation in the form of heat (and is it all in the form of heat?) is either absorbed making the endothermic reaction cold or radiated out making exothermic reactions warm. Are there reactions where there is absolutely no absorbing or radiating of electromagnetic radiation? Why do exothermic and endothermic reactions occur in the first place? I know that it probably has to do with the way the electron configurations work when there is a chemical reaction, but I donít know how that works because I learned this stuff a long time ago in a chemistry class. I know there are covalent bondsÖare these where electrons get shared? Are polar and nonpolar bonds covalent, and if so, are covalent bonds the sharing of electrons and how does that work? Also of covalent bonds, are their both endothermic and exothermic reactions, and if so what would be examples and how would it work? And there are ionic compounds. I also ask the same thing of ionic compounds. Arenít ionic compounds made by the stripping of an electron from one atom, the anion, and the same electron being added to the other atom, the cat ion, like table salt, where the electron gets stripped from the sodium, a metal, and absorbed by the chlorine atom? Isnít this because the metal has a loose outer electron, and that is the reason that metal is malleable and can conduct electricity? I know that the reaction of sodium and chlorine is an exothermic reaction, but are all ionic reactions exothermic? And with any chemical reaction, there seems to be a way that the electron configuration that is normal for it has a way of expressing a potential place that electrons can become part of the configuration, like with the chlorine when it absorbs the loose outer electron of the sodium atom. However, I see that the place that, in this instance, the sodium is very weak in its electron configuration, so it loses the electron to the more powerful potential electron configuration of the chlorine atom. My knowledge of this is very slim, but I am wanting to figure out how it works.