Question

Name the type of colloids in each in which dispersed phase and the dispersing medium are respectively. (a) liquid and gas. (b) liquid and liquid. (c) liquid and solid. Give one example of each.

Answer 1

a) Aerosol

b) Emulsion

c) Gel

• Colloidal mixtures comprising two immiscible liquids, one of which serves as the dispersed phase and the other as the dispersion medium, are known as emulsions.
• In an emulsion, the dispersed phase's particles are smaller than the suspended droplets (dispersed phase). Ex- milk, hair cream
• Gel is a colloidal system in which solid acts as a dispersion medium and liquid acts as a dispersed phase. Cheese and jellies are examples.
• Liquid is the dispersed phase while gas is the dispersion medium in an aerosol. Ex- Fog, moist
• A mixture in which one component is continuously disseminated across another is referred to as a colloid system. Colloid systems typically develop when two components are mixed together but do not combine to create a solution.

Hence, the answer for first part is Aerosol and example is fog. For second part, it is emulsion and example is milk. For third part, answer is gel and example is cheese.

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Answer 2

Answer:- Colloid, any substance which include debris significantly large than atoms or regular molecules however too small to be seen to the unaided eye; greater broadly, any substance, together with skinny movies and fibres, having as a minimum one measurement on this fashionable length range, which encompasses approximately 10−7 to 10−three cm.

(a)Aerosol, example: Fog and Mist

(b)Emulsion, example: milk and ice-cream

(c)Gel, example: curd and cheeze

Aerosol: An aerosol is a system of evenly dispersed, finely split liquid or solid particles in a gas, often air. Dust and other aerosol particles, which serve as the nuclei for condensation and freezing, are crucial to the precipitation process.

Emulsions :- Emulsions are colloidal solutions in which the dispersed phase and the dispersed medium are both liquids. Essential oils and nutrients found in emulsions support the skin's ability to balance its water and oil content.

Gel:- a liquid medium that has grown viscous enough to behave somewhat like a solid. Colloids are clusters of tiny particles, like described above, spread in a continuous media. Syneresis is the contraction of a gel that results in the separation of liquid from it.

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