The changes that can be reversed (reversible)
Which of these shows a reversible change and why?
Question
A piece of iron is heated till it becomes red-hot. It then becomes soft and is beaten to a desired shape. What kind of changes are observed in this processreversible or irreversible?
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💡 Some Related Questions
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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