Question

Give one example in each case:

Change occurs on heating but cannot be reversed.

Answer 1

Reversible changes:

• The changes which can be reversed or are temporary are known as reversible changes.
• Examples of reversible changes are melting of wax, freezing of ice, and boiling water.

Irreversible changes:

• The changes which are permanent are known as irreversible changes.
• Examples of irreversible changes are the burning of fuels and rusting of Iron.

Example of change that occurs on heating but cannot be reversed:

• The baking of bread cannot be reversed.
• Thus it is an example of the change that happens in heating and cannot be reversed.