Collect the chalk dust lying on the floor near the blackboard in your classroom.Or,crush a small piece of chalk into dust.Add a little water to dust to make a paste.Roll it into the shape of a piece of chalk.Let it dry.
Did you recover chalk from the dust?
Pls ansfast.Exams are on head!!!!

Yes. we can recover the chalk. Because its only a physical change. There is only change in shape of the chalk only. 

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