While a pure substance cannot be separated physically, the components of a homogeneous mixture can be separated through mechanical and thermal processes such as distillation, sifting, filtering, and crystallization. Water cannot be separated into hydrogen and oxygen but will only produce water vapor when distilled.Click to see full answer. Just so, is a pure substance a homogeneous mixture?1. A pure substance is a form of matter that has a fixed chemical composition and a distinct characteristic while a homogeneous mixture is a mixture of two or more compounds with compositions that are uniform or mixed together in such a way that they are indistinguishable from each other.Also, is a mixture a pure substance yes or no? If you say that the molecules within a mixture are uniformly the same seperation and density throughout the material, then the answer is yes. This sounds only like an “ideal” mixture. Mixtures are not usually uniform and not evenly distributed on the molecular level. Beside this, why are mixtures not considered pure substances? Mixtures can always be separated again into component pure substances, because bonding among the atoms of the constituent substances does not occur in a mixture. Whereas a compound may have very different properties from the elements that compose it, in mixtures the substances keep their individual properties.Which is a homogeneous mixture?A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. An example of a homogeneous mixture is air. In physical chemistry and materials science this refers to substances and mixtures which are in a single phase.