4.
Explain the following giving examples.
(a) saturated solution
(b) pure substance
(c) colloid
d) susnension
Answers
Explanation:
a. At any particular temperature, a solution that has dissolved as much solute as it is capable of dissolving is said to be a saturated solution. Examples of saturated solutions are soft drinks and nitrogen in Earth’s soil.
b. A pure substance is one which is made up of only one kind of particles. It cannot be separated into different constituents by physical or chemical processes. Some examples of pure substances are bromine, nitric acid, calcium oxide, etc.
c. Colloids are heterogeneous mixtures in which the size of solute particles is intermediate between those in true solutions and those in suspensions and are big enough to scatter light. Some examples are: Milk, blood, paint, etc.
d. A suspension is a heterogeneous mixture in which the small particles of a solid are spread throughout a liquid without dissolving in it. The particles of a suspension can be seen by the naked eye. Some examples of suspension are Chalk – water mixture, flour in water, Milk of Magnesia etc.