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Anwesha Dash from APEX ENGLISH MEDIUM SCHOOL , asked a question
Subject: Science , asked on 5/8/14

why do napthalene balls disappear after some time ?

Rishi Verma , From Lancer's Convent Sr Sec School , added an answer
Answered on 12/6/12

napthalene has a property to sublime. these balls turn into vapour because the intermolecular force is very weak.

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Atul Singh , From D A V Kapil Dev Public School , added an answer
Answered on 12/6/12

 because it directly change into gas

Raima Sinha , From Kendriya Vidyalaya , added an answer
Answered on 12/6/12
This is due to the property of sublimation. Some solids do not exist in their liquid form; instead they directly evaporate from their vapour forms. Naphthalene is among those solids that show the property of sublimation.
So naphthalene balls disappear after some time due to the property of sublimation.

Aaliya , added an answer
Answered on 12/6/12

AS NAPHTHALENE BALLS HAV THE TENDENCY OF SUBLIMING WEN EXPOSED TO ATMOSPHERE THEY DISAPPEAR AFTER SUM TYM.

Bhavesh Dhakad , added an answer
Answered on 18/8/13

This is due to the property of sublimation. Some solids do not exist in their liquid form; instead they directly evaporate from their vapour forms. Naphthalene is among those solids that show the property of sublimation.So naphthalene balls disappear after some time due to the property of sublimation.

Shrishti , From B.r.d.a.v Public School , added an answer
Answered on 5/8/14

due to sublimination

Saransh Anand , From Kendriya Vidyalaya No 1 , added an answer
Answered on 5/8/14

Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas takes place easily. Thus, naphthalene balls disappear with time without leaving any solid.Following things also show this property:-

1)AMONIUM CHLORIDE

2)IODINE

3)CAMPHOR

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