A piece of iron is heated until it becomes red-hot. It then becomes soft and is beaten to the desired shape. What kinds of changes are observed in this process-reversible or irreversible?

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Solution

Reversible changes
A reversible change occurs when a change in a substance can be reversed by changing the conditions.
Examples of reversible changes are freezing of ice, folding of paper, and boiling water.
Irreversible changes
If a change cannot be undone, it is referred to as irreversible. New materials are always formed in irreversible changes.
Burning, cooking, and frying are examples of irreversible changes.
A piece of iron is heated until it becomes red-hot. It then becomes soft and is beaten to the desired shape. It is a type of reversible change as an original piece of iron can be produced back once it is beaten into the desired shape.

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