Question

Q5. Reasoning based Q/A: (5*1=5M)

Give reasons for the following..

1)Napthalene balls disappear without leaving no residue.

2)We can get smell of perfume sitting several meters away.

3)A wooden table is solid at room temperature.​

Answer 1

The naphthalene balls sublime and directly changes into vapour state without leaving any solid.

Explanation:

• Naphthalene undergoes sublimation easily,that is the change of state of naphthalene from solid to gas without intervention of liquid state.
• Thus, naphthalene balls keeps on forming naphthalene vapours which disappear into the air with time without leaving any solid.
• The particles of perfume diffuse rapidly into the air and its smell can be felt while sitting several metres away.
• When perfume is sprayed, its particles diffuse into the particles of air at a very fast rate and reach our nostrils.
• This enables us to smell the perfume from a distance.
• A wooden chair is solid at room temperature because, it has definite shape and volume and it cannot be compressed.

To Learn More...

1.Napthalene balls disappear without leaving behind any residue. what is this conversion known as?

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