Question

Discuss why rusting of iron and burning of paper are chemical change. ( answer in details )​

Answer 1

Answer: Rusting of iron and burning of paper are chemical change because when the changes occur new substances is formed and the the chemical composition is changed.

Explanation: When iron is rusted the rust is the new material formed and the chemical composition also changes. And as for the burnng of paper the ash is the new substance formed.

                                      Brainlist the answer please  

Answer 2

Answer:

(i)Rusting of Iron is a chemical change.

  Reasons: New substances are formed - carbon dioxide, hydrated iron oxide.

                   Irreversible, permanent process as the original iron piece can't be returned.

                   Energy exchange takes place.

(ii)Burning of paper is a chemical change.

   Reasons: New substances are formed - carbon dioxide, water vapour,    smoke, ash.

                    Irreversible, permanent process as the paper can't be back from the ashes and smoke.

                    Energy exchange takes place.

Explanation:

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