# What are differences and similarities between a pure substance and a homogeneous mixture?

Jul 31, 2017

salt (NaCl), copper (Cu), and atmospheric oxygen (${O}_{2}$)
air (${N}_{2}$, ${O}_{2}$, $C {O}_{2}$, etc), salt water (NaCl and ${H}_{2} O$) and brass (Cu and Zn)