Why gases are compressible but not liquids?

How is matter classified on the basis of physical state?

What do you think, matter is made up of small particles or not?

Why does the level of water not change when salt is dissolved in water?

What about a rubber band, can it change its shape? Is it solid?

Sugar and salt kept in different jars gain the shape of their respective jars. Are they solids?

What is CGS unit of volume?

How many cm³ are there in 1 L?

What is meant by density?

Why is the density of solids mostly higher than that of liquids?

A sponge can be compressed. Is it solid or not? Why?

What is meant by kinetic energy?

Why do liquids flow?

Why do people in villages use earthen pots in summer to cool water?

Convert 100 °C to kelvin scale.

Write the name of two substances that sublime.

Give two factors which increase the rate of evaporation.

Why does water have higher boiling point than alcohol? At what temperature in Kelvin, it can be changed into solid state and into vapours?

Name the term used for:
(i) Solid directly formed from the gas: Deposition

(ii) Gas directly formed from the solid: Sublimation

Ice at 0 °C is more effective in cooling than water at 0 °C. Give reason.

Show experimentally that matter is made up of small particles.

Describe by experiment the relationship between the rate of diffusion and density of the liquid.

How is melting point related to intermolecular forces of attraction? Why is latent heat of vaporization higher than latent heat of fusion?

Show by an experiment that by increasing the temperature, the substance can be changed into liquid and then into vapours.

Draw a cyclic figure to show interconversion of states and explain fusion, vaporisation, condensation, solidification and sublimation.

Write an activity to show that water can be made to boil even at a temperate below its normal boiling point (100 °C).

How will you determine the melting point of ice experimentally with the help of a neat and labelled diagram?

How will you determine the boiling point of water experimentally? Draw a neat and labelled diagram.