Question

Define the following terms and give two examples of each (i) Gel (ii) Sol

Answer 1

Answer:

(I) gel is a solid jelly-like soft material that can have properties ranging from soft and weak to hard and tough.Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state. By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional cross-linked network within the liquid. It is the crosslinking within the fluid that gives a gel its structure (hardness) and contributes to the adhesive stick (tack). In this way gels are a dispersion of molecules of a liquid within a solid in which liquid particles are dispersed in the solid medium . The word gel was coined by 19th-century Scottish chemist Thomas Graham by clipping from gelatine.

Explanation:

(II) sol is a type of colloid in which solid particles are suspended in a liquid. The particles in a sol are very small. The colloidal solution displays the Tyndall effect and is stable.

example of gel-Fruit jelly is an example of a gel. Cooked and cooled gelatin is another example of a gel

example of sol-Examples of sols include protoplasm, gel, starch in water, blood, paint, and pigmented ink.

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