(c) A book is a .................. matter.

(d) Solid is very difficult to .................

(e) ............... have no definite shape.

(f) Gases diffuse very ......................... .

(a) Air is a ..................

(b) The molecules are made up of ................. .

(g) Boiling point of water is .................

(c) When a solid is heated, its atoms vibrate show about their fixed position.

(d) In gaseous state, the interparticles spaces are very large

(e) Matter can change from one form to another form on changing temperature and pressure.

(a) LPG means liquefied petroleum gas.

(b) Liquid changing to gas is called fusion.

(1) What is mass?

(2) What is volume?

(5) Why do gases exert pressure?

(3) What is matter?

(4) What is condensation?

(4) A gas exerts pressure on the walls of the container. Why?

(1) Out of these, select natural and man-made matter : coal, wood , silk, soap, cotton, nylon, cellulose, water, medicine, plastic.

(2) Write the characteristics of matter

(3) Write the two differences between boiling and evaporation.

(5) Give reasons for the following observations: (i) Naphthalene balls disappear with time without leaving any solid. (ii) We can get the smell of perfume sitting several metres away.

(1) Write the four properties of solid.

(2) Write the four properties of liquid

(3) Write the four properties of gas.

(4) Write the definitions of the following: (i) Sublimation (ii) Boiling point (iii) Condensation point

Matter

The particles move faster

melting

Convection

boiling point