Question

give reason for the following observations a) naphthalene balls dissappear with time without leaving any solid b) we can get smellof perfume sitting several metres away
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Answer 1

Answer:

Naphthalene balls disappear due to sublimation process. In this no solid residue is left and solid is directly changed in gaseous state.

We can smell the perfume several metres away because of diffusion of gas. because the molecules of perfume diffuse in air and air or gas travels here and there.

Answer 2

$Question$ :-

• Naphthalene balls disappear with time without leaving any solid?
• we can get the smell of perfume sitting several metres away?

$Answer$ :-

1. Naphthalene shows the property of sublimation evaporation of naphthalene takes place easily and show it disappears during the course of time without leaving a solid.
2. Perfumes vaporizer very fast and its vapour diffuse into air easily that is why we can smell perfume sitting several metres away.