What is the balance for Fe + O2 → Fe304

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.