Question

Distinguish between crystalline and amorphous substances

Answer 1

1)Crystalline Solids: They have a regular three dimensional arrangement of atoms, ions or molecules due to which they have well defined geometrical shape.

Amorphous Solid: They do not have regular arrangement of particles, therefore do not have well defined particles.

2)Crystalline Solids: They have long range order

Amorphous Solid: They have short range order

3)Crystalline Solids: They have sharp melting point i.e., they melt at a particular temperature.

Amorphous Solid: They do not have sharp melting point i.e., they melt over a range of temperature.

4)Crystalline Solids: They have high and fixed heat of fusion, i.e., high energy is required to melt 1 mole of crystalline solid.

Amorphous Solid: They do not have fixed heat of fusion.

5)Crystalline Solids: They are anisotropic, i.e., they have different optical and electrical properties in different directions.

Amorphous Solid: They are isotropic, i.e., they have same properties in all directions.

6)Crystalline Solids: They are true solids, i.e., they show all the characteristic properties of solids.

Amorphous Solid: They are pseudo – solids, i.e., they do not show all the characteristic properties of solids.

Answer 2

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Crystalline substance :–

The substance whose constituents are arranged in an orderly manner, leading to definite three dimensional geometrical shape is called Crystalline substance.

Amorphous substance :–

A substance whose constituents are arranged in an irregular manner is called an Amorphous substance.