Explanation:

1. Combustion

2. Photosynthesis 3. Aerobic cellular respiration

4. Anaerobic respiration (including fermentation)

5. Oxidation (including rust)

6. Metathesis reactions (such as baking soda and vinegar)

7. Electrochemistry (including chemical batteries)

8. Digestion

9. Soap and detergent reactions 10. Acid-base reactions

11. Cooking

12. Fireworks 13. Rotting of food

14. Electroplating metals

15. Disinfecting surfaces and contact lenses

16. Drugs

17. Bleaching

18. Hair color

19. Leaves changing color with seasons

20. Salt keeping ice off roads and helping to freeze ice cream

10 chemical changes without which life would not have been possible.

• Combustion is very necessary for living.
• Photosynthesis in plants.
• Fermentation and anaerobic respiration.
• Chemical reactions in batteries.
• Digestion of food.
• Acid-base reactions.
• Cooking of food.
• Use of salt in freezing.
• Disinfecting lenses and surfaces.
• Soap and detergent reactions.

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