These two acts lead to the different kinds of changes. Former can be reversed while the latter cannot be reversed. The pot can be broken down into lumps of clay but after baking the pot in an oven, it cannot be reversed back into its original form.
Question
A potter working on his wheel shaped a lump of clay into a pot. He then baked the pot in an oven. Do these two acts lead to the same kind of changes or different? Give your opinion and justify your answer.
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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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