Phases, Phase Changes, Chemical and Physical Changes

1. Phases, Phase Changes, Chemical and Physical Changes By: Brianna Shields March 19, 2007

2. DO NOW • 1. What tool is used to measure mass? • 2. What is one unit used to label density? • 3. What is volume?

3. GOAL • To discuss the states of matter and the terms relative to changes in state • To distinguish between chemical and physical changes

5. Solid 1. Has a definite shape 2. Has a definite volume Phases of Matter

6. Solid 3. Particles are tightly packed (can’t move or flow well) 4. Low energy Phases of Matter

7. Solid 5. May be crystals with repeating patterns Ex: salt Phases of Matter

8. Solid 6. Amorphous solids lose shape/flow like slow moving liquids Ex: candle wax, window glass, tar Phases of Matter

9. Liquid 1. No definite shape- takes the shape of the container 2. Has a definite volume Phases of Matter

10. Solid 3. Particles are packed loosely and flow slowly 4. Average energy Phases of Matter

11. Liquid 5. Varying viscosities= resistance of a liquid to flow Honey has a high viscosity Phases of Matter

12. Gas 1. No definite shape- takes shape of container 2. No definite volume Phases of Matter

13. Gas 3. Particles are spread far apart- fill all spaces 4. Contantly moving and bumping into eachother 5. High energy Phases of Matter

14. Gas 6. Particles can be squeezed in closer Bumping into eachother and walls causes pressure Phases of Matter

15. Phase Website • Phases of matter at the molecular level

16. Phase Summary Chart • Work with a partner to fill in the phase summary chart

18. Phase Changes Matter such as water can change from phase to phase by adding or taking away heat energy Phase Changes

19. Melting Solid to liquid Must take in heat energy M.P of water = 0 C or 32 F Phase Changes

20. Examples of Melting

21. Freezing Liquid to solid Must lose heat energy F.P of water = 0 C or 32 F Phase Changes

22. Examples of Freezing

23. Evaporation Liquid to gas Must gain heat energy B.P of water = 100 C or 212 F Phase Changes

24. Examples of Evaporation

25. Condensation Gas to liquid Must lose heat energy Phase Changes

26. Examples of Condensation

27. Sublimation Solid skips to gas Must gain a lot of heat energy Ex: Freezer Frost Dry Ice Cirrus Clouds Phase Changes

28. Phase Change Website • Click here to view a phase change

29. Phase Change Diagram

30. Assessment • Determine what phase change is the opposite of evaporation. Explain

31. Assessment • What type of phase change is seen in this picture? Explain what occurs during this phase change

32. Assessment • What type of phase change is seen in this picture? Explain what occurs during this phase change

33. Assessment • What phase change is the opposite of freezing? Explain

34. Physical Change Change in the appearance of a substance without changing its identity The atoms remain unchanged Physical and Chemical Changes

35. Carving a baseball bat

36. Dyeing your hair

37. Smashing a rock

38. Melting/Freezing water

39. Boiling Water

40. Sharpening a Pencil

41. Chopping down a tree

42. Spilled milk

43. Crumpling paper

44. Mowing the lawn

45. Mixing ingredients

46. Chemical Change A substance changes into a new and different substance The atoms are altered Often involves chemical rx Physical and Chemical Changes

47. Any type of burning

48. Rusting Metal = iron + oxygen

49. Verdigris: copper + sulfur

50. Fireworks