The document discusses reversible and irreversible changes. Reversible changes can go forward and backward, such as folding paper or melting butter. Irreversible changes cannot go backward, like burning wood or rusting iron. Examples are provided of changes that are reversible, like freezing orange juice or dissolving salt in water, and those that are irreversible, including burning a matchstick or toasting bread.

1. Reversible and Irreversible
change

2. Reversible change
A change that can go forward
or backward

3. Reversible change

4. Reversible change

5. Reversible change

6. Irreversible change
A change that cannot go
backward

7. Irreversible change

8. Irreversible change

9. Irreversible change

10. Is it reversible or irreversible change ?
Folded paper
reversible

11. Is it reversible or irreversible change ?
Blowing a balloon
reversible

12. Is it reversible or irreversible change ?
Burning wood
irreversible

13. Is it reversible or irreversible change ?
Iron rust
irreversible

14. Is it reversible or irreversible change ?
Melting butter
reversible

15. Is it reversible or irreversible change ?
Burning match stick
irreversible

16. Is it reversible or irreversible change ?
Toasting bread
irreversible

17. Is it reversible or irreversible change ?
Freezing orange juice
reversible

18. Is it reversible or irreversible change ?
Dissolving salt in water
reversible

19. Is it reversible or irreversible change ?
Melting wax
Burning thread irreversible
reversible

20. Is it reversible or irreversible change ?
Ice turning into water
reversible