(i) Melting of wax
(ii) Folding of a paper
(iii) Knitting of a sweater
(iv) Inflating of a tyre
Question
Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.
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Paheli mixed flour and water and (i) made a dough (ii) rolled the dough to make a chapati (iii) baked the chapati on a pan. (iv) dried the chapati and ground it in a grinder to make powder. Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.
Open Answer »Give one example in each case. (i) Change which occurs on heating but can be reversed. (ii) Change which occurs on heating but cannot be reversed. (iii) Change which occurs on cooling but can be reversed. (iv) Change which occurs on mixing two substances, but can be reversed. (v) Change which occurs on mixing two substances, but cannot be reversed.
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