Questions to Ask Yourself to Help Decide.

1. Is a completely new substance formed?

2. Has a new colour appeared?

3. Has there been an energy change?

4. Has a gas been formed?

5. Is the change difficult to reverse?

Examples:

1. Drawing a sketch with a pencil

materials you start with - pencil, paper

materials you end up with - a drawing (contains both paper and pencil)

2. Baking Bread

materials you start with - dough

materials you end up with - baked bread

Physical or Chemical Change???

Classify each of the following as Chemical or Physical changes and explain why.

1. Making ice cubes

2. Boiling an egg

3. Toasting a piece of bread

4. Taking a photograph

5. Breaking glass

6. Melting solder

7. Dissolving of sugar in tea

8. Formation of sleet

9. Turning on a fight

10. Glowing of a neon sign

11. Baking a cake

12. Igniting a match

13. Magnetizing a nail

14. Decay of fallen leaves

15. Rusting of Iron

16. Drying of paint

17. Fermentation of cider

18. Boiling of water

19. Formation of dew

20. Disappearance of moth balls

21. Burning wood

22. Formation of frost

23. Disappearance of dry ice

24. Cutting bread

25. Growing vegetables