The document discusses reversible and irreversible changes. A reversible change is one that can go forward or backward and does not result in a new substance, while an irreversible change results in one or more new substances. Examples are provided of changes that are reversible, such as folding paper or melting butter, and irreversible, such as burning wood or rusting iron.

2. Science
Topic: Reversible and
Irreversible change
presentation:1

3. Reversible change:
 A change that can go forward or backward.
Cool
Heat

4. Reversible change:
Heat
Cool

5. Reversible change:
Is a change that doesn’t results in a new
substance.

6. Irreversible change:
Is a change that results in one or more new
substance.

7. Irreversible change:
Heat

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
Irreversible

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