Podcast
Questions and Answers
What is the purpose of using lyophilic colloids in protecting lyophobic colloids?
What is the purpose of using lyophilic colloids in protecting lyophobic colloids?
- To accelerate the coagulation of lyophobic particles
- To form a protective layer around lyophobic particles, shielding them from electrolytes (correct)
- To reduce the stability of the colloidal system
- To enhance the dispersion of lyophobic particles in the solvent
Which type of emulsion has water as the dispersion medium?
Which type of emulsion has water as the dispersion medium?
- Vanishing cream emulsion
- Oil dispersed in water (O/W type) (correct)
- Water dispersed in oil (W/O type)
- Butter emulsion
What is the role of an emulsifying agent in stabilizing an emulsion?
What is the role of an emulsifying agent in stabilizing an emulsion?
- To form an interfacial film between suspended particles and the medium (correct)
- To promote separation of the liquid phases
- To reduce the shelf life of the emulsion
- To increase the rate of coalescence of droplets
What is a defining characteristic of irreversible sols?
What is a defining characteristic of irreversible sols?
In which type of colloids do macromolecules form solutions in the colloidal range?
In which type of colloids do macromolecules form solutions in the colloidal range?
What differentiates lyophobic sols from lyophilic sols?
What differentiates lyophobic sols from lyophilic sols?
What is the main characteristic of lyophilic colloids?
What is the main characteristic of lyophilic colloids?
What term is used to describe colloidal sols formed by substances like gum, gelatine, and starch mixed with a suitable liquid?
What term is used to describe colloidal sols formed by substances like gum, gelatine, and starch mixed with a suitable liquid?
What happens if the dispersion medium is separated from the dispersed phase in a lyophobic sol?
What happens if the dispersion medium is separated from the dispersed phase in a lyophobic sol?
Which term describes substances that do not form colloidal sols when simply mixed with the dispersion medium?
Which term describes substances that do not form colloidal sols when simply mixed with the dispersion medium?
