Question

1. Define the following:
(a) Natural materials
(b) Transparent materials
2.
Name any three materials that are (i) transparent (ii) opaque in nature.
3.
Which state of matter (i) can (ii) cannot easily change its shape and volum
Why?
4.
Why do materials diffuse into each other?
5.
Define the term ‘solubility'. How does it change on increasing the temperat
of water?
6.
Name three materials that are (i) soluble (ii) insoluble in water.​

Answer 1

Answer:

Que1:- (a) A natural material is any product or physical matter that comes from plants, animals, or the ground. (b) Materials like air, water, and clear glass are called transparent. When light encounters transparent materials, almost all of it passes directly through them. Glass, for example, is transparent to all visible light. Translucent objects allow some light to travel through them.

Que2:- (i) Materials like air, water, and clear glass are the three materials which are transparent.

(ii) Concrete, wood, and metal are the three materials which are opaque.

Que3:- solid can easily change its shape and volume.

Que 4:- It happens because of the difference in the concentration between the particles. Generally, the particles move from the area of higher concentration to the area of lower concentration until it is evenly spread out.

Que 5:- Solubility the maximum amount of a substance which can be dissolved in 100 grams of water at a given temperature is known as the solubility of that substance in water.

The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions

Que 6:- (i) Salt, Sugar and coffee

(ii) pepper , sand , soyabeans.