8 properties of colloids

Colloidal sols are biphasic in nature. It consists of the dispersed phase and the dispersion medium. In the colloidal solution, each particle is contained within its own surface boundary and therefore has a separate existence from the dispersion mediu..

Brownian movement When a colloidal solution is viewed through a powerful microscope, the colloidal particles can be seen moving in a random zig-zag path. This zig-zag motion of colloidal particles is called Brownian movement. This random motion is due to c..

In this type of colloids the colloidal particles are aggregates of atoms or small molecules with molecular size less than one nanometer (1 nm). For e.g., gold sol consists of particles of various sizes which are clusters of several gold atoms. Similarly, sulphur sol consists of..

Property True solutions Colloidal solutions Suspensions Particle size Less than 10 - 7 cm Between 10 - 5 and 10 - 7 cm Greater than 10 - 5 cm Visibility of particles Invisible to naked eye not visible under powerful microscope Inv..

Property True Solutions Suspensions Colloidal Solutions Particle size Less than 10 - 7 cm Greater than 10 -5 c m Between 10 - 5 and 10 - 7 cm Visibility of particles Invisible to naked eye not visible under powerful microscope Easily visible Invisibl..

Colloidal particles have high average molecular masses. Therefore the mole fraction of the dispersed phase is very low. Hence, in colloidal solutions the relative lowering of vapor pressure, elevation in boiling point, depression in freezing point and osmotic pressure is very l..

Electrical conductivity varies from 10 8 Ohm cm - 1 in metals to 10 - 1 2 ohm - 1 cm - 1 in insulators. Based on their conductivity solids can be divided into three categories. (a) Conductors (b) Semiconductors (c) Insulato..

A compound cannot be separated into its constituents by mechanical or physical means. For example, if we bring a magnet near a sample of iron sulphide, the iron present in the iron sulphide cannot be separated . Properties of a compound differ entirely from those of its constituent e..

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