Question

Give reasons : 1)naphalene balls diappers without living any solid. 2)we can get the smell of perfume sitting several meters away.

Answer 1

1) naphathalene balls is a carbon dioxide and turns into vapours without changing into liquid. Thurs, napthalene balls disappear without leaving any solid
2)it is because at high temperature rate of diffusion is low, hence one has to go to close to smell it

Answer 2

1. napthalene balls is a volatile substance. it goes under a process named sublimation and keep subliming and soon disappear without leaving any residue
2. because of the process diffusion the particles of perfume get mixed with the particles of air and reaches us.