1. Chemical and Physical Changes Notes

2. Warm - Up What are the three states of matter? Which state of matter is most easily compressed? Which state(s) of matter have a definite volume? What is the definition of a heterogeneous mixture?

3. Objective Today I will be able to: Describe the classification of matter Differentiate between a chemical and physical change

4. Homework Chemical and Physical Changes WS Wear Closed Toe Shoes Tuesday

5. Agenda Warm – Up Classification of Matter Notes Sorting Activity Chemical and Physical Changes Notes Sorting Activity Chemical and Physical Changes Worksheet Classification of Matter Review Game

7. The Rules 5 minutes or all of the examples One person goes at a time, in order Classify the substance as element, compound, heterogeneous mixture or homogeneous mixture Player may pass I keep score

8. hydrogen

9. element

10. atmosphere

11. heterogeneous mixture

12. sugar

13. compound

14. pitcher of Kool-Aid

15. homogeneous mixture

16. silicon

17. element

18. lithium

19. element

20. brass (alloy)

21. homogeneous mixture

22. ocean

23. heterogeneous mixture

24. salad

25. heterogeneous mixture

26. titanium

27. element

28. titanium alloy

29. homogeneous mixture

30. baby food (in a jar)

31. homogeneous mixture or heterogeneous mixture

32. sodium

33. element

34. salt

35. compound

36. saline solution for contact lenses

37. solution = homogeneous mixture

38. pizza

39. heterogeneous mixture

40. carbon

41. element

42. bromine

43. element

44. glass (silicon dioxide)

45. compound

46. aluminum

47. element

48. black coffee (brewed)

49. homogeneous mixture

50. graphite

51. element (form of carbon)

52. water

53. compound

54. gold

55. element

56. Lucky Charms

57. heterogeneous mixture

58. diamond

59. element (form of carbon)

60. sulfur

61. element

62. methane

63. compound

64. blood

65. homogeneous mixture

66. milk

67. homogeneous mixture

68. potassium

69. element

70. lithium chloride

71. compound

72. salad dressing

73. heterogeneous mixture

74. air in a SCUBA tank

75. homogeneous mixture

76. uranium

77. element

78. calcium carbonate (sea shells)

79. compound

80. bronze

81. homogeneous mixture

82. sucrose

83. compound

84. lead

85. element

86. Chemical and Physical Changes Notes

87. Physical Properties Description of a substance undergoing a physical change Intensive Properties – do not depend on the amount of matter present (density, boiling point, freezing point, color, odor) Extensive Properties – depend on the amount of matter that is present (mass, volume, pressure, length)

88. Chemical Properties Enables a substance to change into a brand new substance, and they describe how a substance reacts with other substances

89. Changes in Matter Through experimentation and natural occurrences, matter tends to change in either of two ways - Physical Changes - Chemical Changes

90. Physical Changes Only physical properties change The form of matter changes, but the identity of the matter remains the same Examples: change in state (phase change), breaking a pencil, tearing paper

91. Physical Changes Phase Change – physical process in which one state of matter is transformed into another

92. Physical Changes

93. During a change of state, the temperature remains constant, but energy must be continually transferred because the particles that make up the sample have different quantities of potential energy before and after the change

94. Physical Changes

95. Chemical Changes Properties of original substance disappear as new substances with different properties are formed Change in chemical composition Cannot return to original form Can be detected through – energy changes (temperature), change in color, emission of gas, solid formed Examples – wood burning, iron rusting, sour milk

96. Examples – Chemical or Physical Change? A match lights when struck Wood is placed into a chipper A lump of gold is pounded into a large, thin sheet Baking powder bubbles and gives off CO 2 when it is moistened A pan of water boils on the stove Hydrogen Sulfide gas causes silver to tarnish

97. Reactions Involving Energy Most chemical reactions, physical changes of state, and dissolving processes involve energy changes Energy can be released or absorbed Exothermic Reactions Endothermic Reactions

98. Reactions Involving Energy Exothermic Reactions – reactions that release energy into their surroundings - Results in a temperature increase - Feels warm to the touch Example Reaction – Combustion of Propane - C 3 H 8(g) + 5 O 2(g)  3 CO 2(g) + 4 H 2 O (g) + 2043 kJ

99. Reactions Involving Energy Endothermic Reactions - reactions that absorb energy from their surroundings - Results in a temperature decrease - Feels cold to the touch Example Reaction – Photosynthesis - Sunlight + 6 CO 2(g) + H 2 O (l)  C 6 H 12 O 6(aq) + 6 O 2(g)

100. Exit Ticket Write down an original example of: A heterogeneous mixture A homogeneous mixture A compound An element