Which option correctly describes an emulsion?

Which option correctly describes an emulsion?

• A. A solid in a liquid.
• B. A colloid consisting of gases dispersed in liquids.
• C. Colloids consisting of liquids spread throughout other liquids.
• D. A solution where a solute is dissolved in a solvent.

Answer: (C)

An emulsion is a type of colloid in which tiny droplets of one liquid are dispersed throughout another liquid that they do not mix with. This means you have liquid droplets suspended in a different liquid, forming a heterogeneous mixture on a microscopic scale. Emulsions typically require an emulsifier to keep the droplets from coalescing and separating over time. Classic examples are fat droplets in milk or oil droplets in mayonnaise, where two immiscible liquids are intimately mixed with stabilization. This description matches the idea of liquids spread throughout other liquids, which is why that option is the best. A solid in a liquid describes a suspension, not an emulsion. A gas dispersed in liquids refers to foams or aerosols, not liquids within liquids. A solution involves dissolved particles at the molecular level, not dispersed droplets.

An emulsion is a type of colloid in which tiny droplets of one liquid are dispersed throughout another liquid that they do not mix with. This means you have liquid droplets suspended in a different liquid, forming a heterogeneous mixture on a microscopic scale. Emulsions typically require an emulsifier to keep the droplets from coalescing and separating over time. Classic examples are fat droplets in milk or oil droplets in mayonnaise, where two immiscible liquids are intimately mixed with stabilization.

This description matches the idea of liquids spread throughout other liquids, which is why that option is the best. A solid in a liquid describes a suspension, not an emulsion. A gas dispersed in liquids refers to foams or aerosols, not liquids within liquids. A solution involves dissolved particles at the molecular level, not dispersed droplets.