Difference between homogenous mixture and a pure substance

Matter is composed of different forms of substances like atoms and other molecules having volume and mass. All types of matter are classified under two groups’ mixtures and pure substances. It always not possible to figure out the difference and similarities between them however the key differences and similarities between the two are pointed out.
In chemistry almost all substances changes their chemical composition and characteristics. A chemical substance is also known as a pure substance as the elements contained in it cannot be separated physically without breaking the chemical chain between them. The chemical composition of pure substances remains fixed and has unique individual properties of solid, liquid and gaseous or plasma states.  Some of the examples of pure substances include water, salt, gold, diamonds etc. A homogenous mixture is defined as a type of mixture consisting of two or more chemical components which cannot be visually distinguished. The composition of homogenous mixtures remains constant and separating the components of homogenous mixture often becomes a challenging task. Pure substances are chemical substances that are composed of one type of atom or molecule which are not chemically bonded with each other.

Pure substances when gets combined together with substances forms mixture. Hence mixtures are composed of two or more number of pure chemical substances where the elements and the compounds get mixed together resulting in variety of compositions.  Mixtures thus formed can be either a heterogeneous or a homogenous type.
The basic differences between homogenous mixtures and pure substances are as follows:

Pure substances can be separated by physical means but the components of homogenous mixture can be separated only by means of mechanical or thermal processes such as filtering, distillation or crystallization. The characteristics if each of the substances stays intact even if they gets formed into other substances such as alloys, solutions colloids etc. On the other hand, the properties of pure substances gets displayed and changes accordingly depending on the proportion of its components. Pure substances have sharp melting points and boiling points that is in pure substances, the temperature does not change until and unless its components start melting. But in case of homogenous mixture, the melting point of mixtures differs from one another. Pure substances are a form of matter having a fixed chemical composition which homogenous mixtures are composed of two or more compounds mixed uniformly.

Similarity of heterogeneous mixture and pure substances

In spite of such a differences, between mixtures and pure substances, still there exists some similarity between the two. Mixtures are made up of two or more pure substances and hence some of the properties of mixture are same as that of pure substances. Some of the commo9n properties of mixture and pure substances are as follows:
Both mixtures and pure substances have their own weight, color and volume while pure solids have their own shape, hardness or texture. Pure substances and homogenous mixtures have points at which they boil and solidify.