How will you justify that water is a compound ?

How will you justify that ice, water and steam are not different substances but different states of the same substance ?

How will you justify that the collisions among the gas molecules are perfectly elastic?

How will you justify that the collision among the gas molecules are perfectly eleastic?

How will you justify that the collision among the gas molecules are perfectly elastic?

How will you purify muddy water ?

How will you justify that milk is an emulsion of oil in water with the help of dye test?

How will you justify that milk is an emulsion of oil in water with the help of dilution test ?

How will you justify that the formation of water from hydrogen and oxygen is a chemical change and not a physical change ?