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1. burning of any materials

2. rusting of iron

3. cooking of food

4. spoilage of food

5. fermentation

6. denaturation of protein through boiling

7. mixing of acids and bases

8.curdling of milk

9. decaying of organic material

10. chewing of carbohydrate

11. action of  enzymes on food

12. tarnishing of silver

13.  putrefaction

14. production of salts from heavy metal

15. precipitation

16. burning of gasoline

17. ripening of fruits

18. production of acid rain

19. application of heat on magnesium

20. growth also involves chemical change

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