Chemistry > Solid State > 1.0 Classification of Solids
Solid State
1.0 Classification of Solids
2.0 Types of Lattice
3.0 Calculation of number of particles in a Unit Cell
4.0 Close Packing in Crystals
5.0 Calculation of Spaces occupied i.e., Packing Fraction
6.0 Calculation of density of a cubic crystal from its edge
7.0 Classification of Ionic Structures
8.0 Imperfection in Solids
9.0 Properties of Solids
10.0 Silicates
1.1 Difference between Crystalline and Amorphous Solids
- The substances which show same electrical and optical properties in all directions are called isotropic and the substances exhibiting directional differences in properties are called anisotropic.
Amorphous solids like liquids and gases are said to be isotropic while crystalline solids are called anisotropic.
- Due to the definite ordered state a crystalline solid tends to melt at a very short range of temperature or in other words, these have sharp melting points.
- While amorphous solids melt at larger range of temperatures. Crystals are bound by plane faces.
- The angle between any two faces is called interfacial angle. For a given crystalline solid, it is definite angle and remains always constant no matter how the face develops. On the other hand, amorphous solids do not have well defined planes.
- When an amorphous solid is broken, the surfaces of the broken pieces are generally not flat and they intersect at random angles.
