Question

(a) Compare the properties of solids, liquids and gases in tabular form.
(b) Give two reasons for saying that wood is a solid.
Figure

Answer 1

property of solids :-

● generally hard

● high density

● no molecular space

property of liquids

● easily flow able

● low density then solid

● high molecular space then solid

property of gasses

● find in free state in atmosphere

● easily moveable

wood is solid because ◆ it has high density density , non press able

Answer 2

(a) Properties of solids, liquids and gases.

(b) Two reasons for proving wood being solid.

Explanation:

solids:

• The solid substances posses a definite shape as well as definite volume.
• The molecules in solid are rigid and do not flow.
• The inter-molecular forces between the molecules in solid are very strong.
• The solids can diffused into liquids.
• The kinetic energy possessed by the particles is least at a given temperature.

Liquids:

• The liquid substances posses an indefinite shape i.e., they take the shape of the container but posses a definite volume.
• The molecules in liquid are less rigid and but flows easily.
• The inter-molecular forces between the molecules in liquid are less strong i.e., moderate.
• The liquids diffusion process is higher as compared to solid.
• The kinetic energy possessed by the particles is higher as compared to solid at a given temperature.

Gases:

• The gas substances neither posses a definite shape nor volume.
• The molecules in gas are not at all rigid but flow very easily.
• The inter-molecular forces between the molecules in gas are weak.
• The gases are highly diffusible because the molecules move randomly with a high speed.
• The kinetic energy possessed by the particles is considered to be high/maximum in case of gas at a given temperature.

(b) Two reasons for proving wood being solid:

• Wood has a definite shape.
• Wood is rigid as the intermolecular force of attraction is strong.