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Tanmay Shreshth from LITERA VALLEY SCHOOL , asked a question
Subject: Science , asked on 22/7/13

an example of a reversible chemical change

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Satvik Bansal , From Delhi Public School , added an answer
Answered on 23/7/13

melting of ice

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Yadavi Malhotra , From Tagore International School , added an answer
Answered on 22/7/13

example for reversible change is folding of paper.

Aditya Nandy , From O P Jindal School , added an answer
Answered on 23/7/13

An example of a reversible chemical change is thermal decomposition of salts such as hydrates copper-sulphate results in the dehydration of the salt.

CuSO 4 .5H 2 O ———–> CuSO 4  (s) + 5H 2 O (g)

In this reaction, colour changes from blue to white. Water is removed from the copper sulphate. This dehydration reaction can be reversed by slowly adding water back to the powder. This reaction is exothermic and the blue colour of the powder is retained.

CuSO 4  (s) + 5H 2 O ————> CuSO 4 .5H 2