Which would show an example of how physical changes are reversible?

A cutting a gold bar in two pieces and then putting the pieces next to each other

B burning a match and then relighting it

C melting tin and then cooling it into a mold

D combining sodium and chlorine to make the new material of table salt

Answer: Option (C) is the correct answer.

Explanation:

A change in which there will be no formation of a new compound and in which there occurs no change in chemical composition is known as a physical change.

Also, a change in which reactants can be recovered from the products or vice versa is known as a reversible change.

For example, melting tin and then cooling it into a mold is a physical change as no new compound is forming. Also, it is a reversible change because by heating the tin we can melt is again.

Thus, we can conclude that melting tin and then cooling it into a mold show an example of how physical changes are reversible.

C melting tin and cooling it into a mold