Friday, 5 January 2018

Explain the following giving examples Question 4 from Chapter 2. IS Matter Around Us Pure ?

(a) saturated solution
(b) pure substance
(c) colloid
(d) suspension

Answer : 
(a) Saturated solution : A solution at any particular temperature, having maximum amount of solute which  can be dissolve in it, is called a saturated solution. In other words, at a given temperature no more solute can be dissolved in a saturated solution.
(b) Pure substance : A pure substance contains only one kind of pure matter and its composition is the same throughout. Mixtures are constituted by more than one kind of pure substance.A pure substance cannot be separated into other kinds of matter by any physical process.Whatever the source of a substance may be, it will always have the same characteristic properties. Examples Sugar, sodium chloride.
(c) colloid : A colloid or a colloidal solution is a heterogeneous mixture in which the particles of a colloid are uniformly spread throughout the solution. Due to the relatively smaller size of particles,  the mixture appears to be almost homogeneous,  for example, milk.
(d) Suspension : A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium. Particles of a suspension are visible to the naked eye.
The particles of a suspension scatter a beam of light passing through it and make its path visible.The solute particles settle down when a suspension is left undisturbed, that is, a suspension is unstable. They can
be separated from the mixture by the process of filtration. When the particles settle down, the suspension breaks and it does not scatter light any more.

This is an answered question from Chapter 2. IS Matter Around Us Pure ? of CBSE Class 9th Science

Check for Complete Exercise Solution for Chapter 2. IS Matter Around Us Pure ? | CBSE Class 9th Science

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