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10 ) The burning of candle is an irreversible change as the burnt candle thread cannot be obtained. While the melting of the wax is a reversible change as the shape of the wax can be obtained by heating it.
13 b)Melting of wax is a reversible process. Since upon cooling, it changes back to solid wax. Similarly, Solidification of melted wax can be reversed which is the melting of wax.
7)a Reversible changes
A substance can return to its original state.
The chemical properties of the substance do not change.
b irreversible change
A substance cannot return to its original state.
The chemical properties of the substance change
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