Question

1 What was the basic classification of element in ancient time?
Name them.
2 () As the temperature rises, particles move .......
(i) With increase in temperature, the kinetic energy of the
particles also
(iii) The rate of diffusion of liquids is ...............than that of solids.
3 A piece of chalk can be broken into small particles on
hammering, but it is not possible to break a piece of iron in the
same fashion. Why?
Find the density of a handful of sand having a mass of 208 g and
it displaces a volume of 80 mL of water.
5 What is fluid?
6 Why solid ice floats on water?
7 By which physical process the fragrance of burning incense
stick spreads all around?​

Answer 1

1) elements are classified in ancient time by their weight and their shape.

2)as per the temperature increases the particles move fastly.

i) With increase in temperature the kinetic energy of the particles also increases.

3) because the chalk piece has a lower intermolecular forces.By which it got broken into smaller particles.

5)Fluid is a matter that flows on any type of surface.

6)Because ice has lower density than water.

7)The fragrance of incense stick around the room increases by The process of

"DIFFUSION"