Write the dispersed phase and dispersion medium of butter.
In colloidal dispersion, one substance is dispersed as very fine particles in another substance called dispersion medium. In the case of dust, solid particles are dispersed in air as the dispersion medium.
Dispersed phase: Liquid
Dispersion medium: Solid
Define the following terms giving an example of each:
(i) Associated colloids
(ii) Lyophilic sol
(iii) Adsorption
Write the dispersed phase and dispersion medium of the following colloidal systems:
(i) Smoke (ii) Milk
Define the following terms:
(i) Brownian movement
(ii) Peptization
(iii) Multimolecular colloids
What is meant by coagulation of a colloidal solution? Describe briefly any three methods by which coagulation of lyophobic sols can be carried out.
What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?
Write the differences between physisorption and chemisorption with respect to the following:
(i) Specificity
(ii) Temperature dependence
(iii) Reversibility and
(iv) Enthalpy change
