A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?

No, the changes which have occurred in the cement cannot be reversed because it is a irreversible chemical change.

Explanation

A bag of cement lying in the open gets wet due to rain during the night. The next day, the sun shines brightly. If due to rain , the cement bag has been wet, then the cement will react with water and will get hardened. This reaction is irreversible in nature and can not be reversed back.

  • When water is added to a dry concrete mix a chemical reaction occurs which causes it to harden.
  • Once the bag becomes wet , the concrete inside absorbs that moisture, the chemical process begins and the concrete permanently hardens and becomes useless.

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