Question

what is criteria of purity of solid substances​

Answer 1

Answer:

The physical properties of a substance can be used to establish its purity. These properties include the melting point and boiling point. Different substances tend to have different melting and boiling points, and any pure substance will have a specific melting and boiling point.

Explanation:

Answer 2

Answer:

Explanation:

Anything that occupies some space and has a mass is called matter. Everything around is referred to as matter.

On basis of their chemical composition, the matter is divided into two categories- pure substances and mixtures.

Pure substances are those that have fixed composition and show the same properties even at different places and at different times.

Pure substances are grouped as Elements and compounds.

Elements

● Elements have only one type of atom.

Example- $He, Na, B, F_{2}$

● All elements are represented by a chemical symbol and are arranged in order of their increasing atomic number in a periodic table.

● There are a total of 118 elements discovered yet.

Compounds:

● Compounds are homogeneous substances formed when 2 or more elements are combined in a fixed ratio by mass.

● The constituent elements of a compound cannot be extracted by physical methods.

● The properties of a compound are entirely different from its constituent particles.

● They have definite composition, melting point, and boiling point.

Example- $H_{2}O, CO_{2} , C_{6}H_{12}O_{6} .$

The criteria of the purity of these substances is that they have a definite melting point (for solids) or a definite boiling point (for liquids).

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