4 (d). Paheli mixed flour and water made dough, rolled the dough to make chapati, baked the chapati on a pan and dried the chapati and ground it in a grinder to make powder. Identify the change whether it ca be reversed or not.

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Solution

A change that cannot be reversed or cannot get back to its original state is called an irreversible change.
Grinding of dried chapati in a grinder is an irreversible change.
Chapati is converted to a powder form on grinding and this powder cannot be reversed back to the original state of chapati.
Hence, this change cannot be reversed.

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Similar questions

What is the difference between the following changes:
(i) Rolling of chapati from dough and (ii) Baking of chapati.

4 (c). Paheli mixed flour and water made dough, rolled the dough to make chapati and baked the chapati on a pan. Identify the change whether it can be reversed or not.

Q. Paheli mixed flour and water and
(i) made a dough,
(ii) rolled the dough to make 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.

Q. While making chapatis, Siddhu realised that some of them are not in a circular shape. Can he convert them back to dough and make the chapatis again in proper shape?

what happens to the shape of a ball of dough when it is rolld to make a chapati?

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