What are the properties of a mixture?

What is the independent variable in this investigation? mass volume sample number substance density

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

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.