Emulsions

Emulsions are colloidal systems formed by mixing two immiscible liquids, typically involving water. They are categorized into oil in water and water in oil types, with examples like milk and butter. Emulsions are unstable and require emulsifying agents for stabilization. These agents form a film between particles and the dispersion medium. Emulsions exhibit properties like Brownian movement and can be broken down by heating or other methods.

What is an emulsion?

• A solid dissolved in a liquid

• A gas dissolved in a liquid

• A coarse dispersion of one liquid in another immiscible liquid

• A mixture of two miscible liquids

Which of the following is an example of an oil in water emulsion?

• Mayonnaise

• Milk

• Cream

• Butter

What is the role of an emulsifying agent in an emulsion?

• To increase the viscosity of the emulsion

• To form an interfacial film between suspended particles and the dispersion medium

• To change the color of the emulsion

• To dissolve the dispersed liquid

Which of the following is a common emulsifying agent for oil in water emulsions?

• Metal salts of fatty acids

• Long chain alcohols

• Proteins

• Mineral oils

How can emulsions be broken into their constituent liquids?

• By adding more dispersion medium

• By heating or using methods like freezing and centrifuging

• By stirring continuously

• By adding more emulsifying agents