Question

& Give reason for the follo
phthalene balls disappear with time without leaving any
ay 1
solid.
We can get the smell of perfume sitting several metres away.
coubstances in increasing order of forces​

Answer 1

answer number 1 naphthalene balls disappear with time without leaving any solid because they are sublime substances.

answer number 2 we can get the smell of perfume sitting several metres away because diffusion takes process faster in gases compared to liquids and solids .Also particle movement in gases is very fast as compared to the other two forms.

solids particles have the highest force of attraction between them

liquid particles have moderate force of attraction between them

gas particles have least force of attraction between them

Explanation:

sublimation is a process in which solid converts directly into gas without going into the liquid form

Answer 2

Hey...your answer is here

• Napthalene balls disappear without leaving any solid because they undergo the process of sublimation that is change of the solid state into gaseous with leaving any residue or liquid
• The perfume molecules spread out or 'diffuse' through the air. The smell becomes less concentrated but it reaches a great distance - meaning you can smell it from relatively far away. When a perfume is sprayed several metres away from the source, the particles of the perfume diffuses with the particles of the gas.