(HELP ASAP) what is the reaction for Si + S₈ --> Si₂S₄

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

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.

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false