Matter

1. Physical or Chemical Properties SPI 0507.9.1 Distinguish between physical and chemical properties.

2. Matter Matter is anything that takes up space and has mass.

3. Bell Work • Sharpen all of the pencils you will need for class. • Take the sets of pictures off of the filing cabinet. • Sort the pictures into categories. “I can distinguish between physical and chemical properties”

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

6. 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.

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

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

9. States of Matter • Solids • Liquids • Gases

10. By adding energy the state changes.

11. 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

12. 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.

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

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

15. 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.

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

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

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

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

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

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

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

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

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

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

26. The Answers

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

28. 2. Physical Change making whip cream

29. 3. Chemical Change baking soda fizzes with vinegar

30. 4. Physical Change sharpening a pencil

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

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

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

34. 8. Physical Change freezing water

35. 9. Chemical Change cornstarch turns black with iodine

36. 10. Chemical Change toasting a marshmallow

37. It’s a gas -activity • Record all of your observations in detail!

38. Exit Pass • Why do you think that zinc bubbles when it is placed in acid? Explain your answer in detail.