First, you need to understand mixture and compound.
首先，你要先明白 mixture 和 compound 的意思。
Mixture : two substances physically combine together 但是呢，
Compound : two elements chemically combine together.
Mixture 可以被 separated via filtration, chromatography, distillation and a lot more. Compound 也可以，但是 to break the bonds between the atoms, it requires a lot of kinetic energy. This is because for particles to break the strong bonds.
