Physical or Chemical Properties

1. Physical or Chemical Properties

2. Matter Matter is anything that takes up space and has mass. Workbook – Read pages 170-171

3. Physical or Chemical Matter can change in two ways – physical or chemical.

4. Physical Change With a physical change no new substance is created and the original matter can be recovered. Physical change does not change the composition of the matter. The original matter is still present. The substance may seem different, but the way the atoms are linked up are the same.

5. Physical Change Physical changes include: • Changing the shape or size • Dissolving • Changing from one state of matter to another

6. Matter Matter can change from one state to another by increasing or decreasing temperature or pressure. Read Workbook pages 172-173

7. Five States of Matter • Bose-Einstein Condensates • Solids • Liquids • Gases • Plasmas

8. By adding energy the state changes.

9. Examples of Physical Change • water evaporating or water changing to steam • clothes drying in a dryer • chopping wood - wood ground to sawdust • erosion • rock breaking • mixing Kool-Aid

10. Chemical Change When a chemical change takes place, a new substance is made. The old matter is no longer present. The matter can not be changed back into its original state. The way the molecules are linked up is different when a chemical change takes place.

11. Signs of Chemical Change • gas bubbles • color change - leaves turning colors in the fall, rust appearing • disappearance of color – fading fabric • heat or light

12. Examples of Chemical Changes • fruit rotting, food spoiling • rust • decay of plants • burning wood • silver tarnishing • car burning gas • baking bread

13. Practice Number your paper 1 – 10. Write chemical or physical for each of the following to describe the type of change which is taking place.

14. 1. Is this a physical or chemical change? dirt added to a puddle of water

15. 2. Is this a physical or chemical change? making whip cream

16. 3. Is this a physical or chemical change? baking soda fizzes with vinegar

17. 4. Is this a physical or chemical change? sharpening a pencil

18. 5. Is this a physical or chemical change? a stick broken into small pieces

19. 6. Is this a physical or chemical change? sugar turns brown, then black with heat

20. 7. Is this a physical or chemical change? using hot water to expand a metal cup

21. 8. Is this a physical or chemical change? freezing water

22. 9. Is this a physical or chemical change? cornstarch turns black with iodine

23. 10. Is this a physical or chemical change? toasting a marshmallow

24. The Answers

25. 1. Physical Change dirt added to a puddle of water

26. 2. Physical Change making whip cream

27. 3. Chemical Change baking soda fizzes with vinegar

28. 4. Physical Change sharpening a pencil

29. 5. Physical Change a stick broken into small pieces

30. 6. Chemical Change sugar turns brown, then black with heat

31. 7. Physical Change using hot water to expand a metal cup

32. 8. Physical Change freezing water

33. 9. Chemical Change cornstarch turns black with iodine

34. 10. Chemical Change toasting a marshmallow