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When a substance undergoes a chemical change it is no longer the same but a   brand____ new___ substance_____.

When a substance undergoes A Chemical change, it means that a reaction occurred that  altered the the chemical composition  and properties of the substance to become a new  substance entirely.

Examples of chemical change are

Rusting of iron.

Burning of wood.

The change of sugar to caramel upon heating.

Cooking.

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