16. You have seen that construction workers heat a black material called coal tar, for repairing a road. State whether the change which has occurred in coal tar on being heated is reversible or irreversible.

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Solution

The coal tar melts to form a thick dark liquid on heating.
It gets solidified again on cooling.
A change which can be reversed or can get back to its original state is called a reversible change
Hence, the melting of coal tar is a reversible change.

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16. You have seen that construction workers heat a black material called coal tar, for repairing a road. State whether the change which has occurred in coal tar on being heated is reversible or irreversible.

The coal tar melts to form a thick dark liquid on heating.It gets solidified again on cooling.A change which can be reversed or can get back to its original state is called a reversible changeHence, the melting of coal tar is a reversible change.

The coal tar melts to form a thick dark liquid on heating.
It gets solidified again on cooling.
A change which can be reversed or can get back to its original state is called a reversible change
Hence, the melting of coal tar is a reversible change.