Let us learn about pure substance.
A pure substance is made up of the same kind of particles e.g. hydrogen, oxygen, water, sodium chloride, etc.
A pure substance is homogeneous (no variation in properties), irrespective of its origin or method of preparation.
A pure substance has particular properties, characteristic of its own.
A pure substance has the same composition throughout. The best example of pure substance, different samples of water, prepared by different methods, by different people at different places always consist of hydrogen and oxygen in the ratio 1:8 by mass and 2:1 by volume. Pure substances can be classified into compounds & elements. If any sample has a different ratio of these particular elements, then it certainly is not water. free online tutor will help you to understand better than this.
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