Question

5 points
7. Describe any three properties of colloids. Categorise the following
examples of colloids into different categories of colloids: jelly, fog, milk,
shaving cream.
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Answer 1

Answer:

Properties are :-

1. The range of particle size is between one nanometer to 100 nanometer.

2. It is translucent.

3. It shows Tyndall effect.

4. The particles of a colloidal solution can be seen with microscope.

5. A colloid is a heterogeneous mixture.

Jelly :- Gel

Fog - Aerosol

Milk - Emulsion

Shaving Cream - Foam

Answer 2

Answer:

Stability: Colloids are relatively stable in nature. The particles of the dispersed phase are in a state of continuous motion and remain suspended in the solution.

Filterability:  Colloids require specialized filters known as ultrafilters for filtration. They readily pass through ordinary filter papers without yielding any residue.

Heterogenous nature: Since colloids consist of two phases, the dispersed phase as well as the dispersion medium, they are known as heterogeneous in nature.

Homogenous appearance: Even though colloids have suspended particles and are heterogeneous in nature, they appear as if it is a homogenous solution. This is because the suspended particles are so tiny that they are not visible by the naked eye.

The jelly is sol form.

The fog is aerosol form.

The milk is emulsion form.

The shaving cream is emulsion form.