Question

Give reasons for the following obsevations.

1. Naphthelene balls disappeare with time without leaving any solid .

2. we can get the sell of perfume sitting several metres away.

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Answer 1

1 : Naphthalene balls undergo sublimation due to which it converts directly into vapours and disappear into air without leaving any solid.

2 : 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.

Answer 2

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Naphthalene balls undergo sublimation due to which it converts directly into vapours and disappear into air without leaving any solid. (b) The particles of perfume diffuse rapidly into the air and its smell can be felt while sitting several metres away.

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

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