Question

Are all sort of *Foams* heterogeneous? Why is it so

( 9th' chemistry ) ​

Answer 1

Answer:

A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.

Answer 2

We can divide heterogeneous mixtures into two categories :-

(i) Suspensions

(ii) Colloids

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We can again divide colloids into 7 groups. They are :-

(ii) Sol

(ii) Solid sol

(iii) Emulsion

(iv) Aerosol

(v) Foam

(vi) Solid foam

(vii) Gel

The foam is a type of colloid in which a 'gas' is dispersed in a 'liquid' medium. Shaving cream, soap bubbles, beer foam etc are some examples of foam.

Also, we have solid foam in which 'gas' is dispersed in a 'solid' medium. The examples of solid foam are sponge, bread and foam rubber.

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Now, as we know that all types of foams are colloids and all colloids are heterogeneous mixtures.

Thus, we can infer that all sort of 'Foams' are heterogeneous .

Some Extra Information:-

Some properties of colloids are :-

(i) A colloid looks like a homogeneous but

actually is a heterogeneous mixture.

(ii) The size of colloidal particles is

bewteen 1 nm and 100 nm in diameter.

(iii) Colloids are quite stable.

(iv) A colloid scatters a beam of light

passing through it and renders it's

path visible. This phenomenon is

called tyndall effect.