Question

A potter shapes pots out of clay. He then bakes the pots in an oven. Identify the reversible and irreversible changes taking plance in the process.

Answer 1

A potter shapes pots out of clay. This is a physical change which can be easily reversed. During this change, only the shape of the substance changes, without any change in the texture of the clay.
The potter then bakes the pots in an oven that makes the clay to becomes hard and brittle. Thus, there is a change in the internal structure of clay which makes soft clay hard and brittle. This is a chemical change which is irreversible.