1. Classifying Matter: Elements, Compounds, and Mixtures

2. Pure Substance A sample of matter that has definite chemical and physical properties. O H H O H2OH2O Water OxygenHydrogen gas sustains combustion gas explosive liquid non-explosive does not sustain combustion (burning) H

3. Element A pure substance that cannot be separated into simpler substances by physical or chemical means. It is made of just one type of atom. o An atom is the smallest particle in an element that still has the physical and chemical properties of the element.

4. Elements and Atoms An atom is the smallest particle in an element that still has the physical and chemical properties of the element.

5. Elements and Atoms An atom is the smallest particle in an element that still has the physical and chemical properties of the element. Hydrogen Helium Lithium Sodium

6. Elements and Atoms An atom is the smallest particle in an element that still has the physical and chemical properties of the element. Hydrogen Helium Lithium Sodium

7. Elements and Atoms An atom is the smallest particle in an element that still has the physical and chemical properties of the element. Hydrogen Helium Lithium Sodium

8. Elements and Atoms An atom is the smallest particle in an element that still has the physical and chemical properties of the element. Hydrogen Helium Lithium Sodium

9. Elements and Atoms An atom is the smallest particle in an element that still has the physical and chemical properties of the element. Hydrogen Helium Lithium Sodium

10. Compound A compound is a pure substance composed of two or more different elements joined by chemical bonds. o Made of elements in a specific ratio that is always the same o Has a chemical formula o Can only be separated by chemical means, not physically o A molecule is two or more atoms combined chemically o A molecule is the smallest particle in a compound that still has the physical and chemical properties of the compound.

11. Molecules A molecule is two or more atoms combined chemically A chemical formula identifies the molecule

12. Molecules A molecule is two or more atoms combined chemically A chemical formula identifies the molecule A molecule could be made up of… …two or three identical atoms of the same element …two or more atoms of different elements H 2 O 2 Hydrogen peroxide H 2 Hydrogen O 2 Oxygen O 3 Ozone C6H12O6 Glucose (sugar)

13. Molecules A molecule is two or more atoms combined chemically A chemical formula identifies the molecule A molecule could be made up of… …two or three identical atoms of the same element …two or more atoms of different elements A compound forms when atoms of two or more different elements combine chemically, or through a chemical change

14. Molecules A molecule is two or more atoms combined chemically A chemical formula identifies the molecule A molecule could be made up of… …two or three identical atoms of the same element …two or more atoms of different elements A compound forms when atoms of two or more different elements combine chemically, or through a chemical change

15. Molecules A molecule is two or more atoms combined chemically A chemical formula identifies the molecule A molecule could be made up of… …two or three identical atoms of the same element …two or more atoms of different elements A compound forms when atoms of two or more different elements combine chemically, or through a chemical change

16. Molecules A molecule is two or more atoms combined chemically A chemical formula identifies the molecule A molecule could be made up of… …two or three identical atoms of the same element …two or more atoms of different elements A compound forms when atoms of two or more different elements combine chemically, or through a chemical change When a compound forms, a new substance with different properties than the original substances is formed = Table salt Soft, shiny metal (solid) Greenish gas Reacts w/ water (explodes) Reacts with body tissue (poisons)

17. Mixture A mixture is a combination of two or more pure substances that are not chemically but rather physically combined. o Substances held together by physical forces, not chemical o No chemical change takes place but rather a physical change o Each item retains its properties in the mixture o They can be separated physically Salty water  liquid & “colorless” like water  salty and “whitish” like salt How can they be separated? solid white salty liquid “clear” “tasteless”

18. Mixtures vs. Compounds http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml

24. Only one type of atom

26. Two types of atoms chemically combined

27. Only one type of atomTwo types of atoms chemically combined

28. Only one type of atomTwo types of atoms chemically combined

29. Only one type of atomTwo types of atoms chemically combined

30. Only one type of atomTwo types of atoms chemically combined Two or more different types of particles (atoms and/or molecules) physically combined and unevenly distributed

31. Only one type of atomTwo types of atoms chemically combined Two or more different types of particles (atoms and/or molecules) physically combined and unevenly distributed

32. Only one type of atomTwo types of atoms chemically combined Two or more different types of particles (atoms and/or molecules) physically combined and unevenly distributed Two or more different types of particles (atoms and/or molecules) physically combined and evenly distributed

33. Can you identify the following? You will be shown a series of slides. Tell if each photo represents an item composed of an element, compound, or mixture. Review: An element contains just one type of atom. A compound contains two or more different atoms joined together chemically. Its properties are different from those of its components. A mixture contains two or more different substances that are only physically together. It can contain both elements and compounds. Its properties are a combination of the properties of its components.

34. Element, Compound, or Mixture? Rocks

35. Element, Compound, or Mixture? Rocks

36. Element, Compound, or Mixture? Copper

37. Element, Compound, or Mixture? Copper

38. Element, Compound, or Mixture? Jelly Beans

39. Element, Compound, or Mixture? Jelly Beans

40. Element, Compound, or Mixture? Table Sugar

41. Element, Compound, or Mixture? Table Sugar

42. Element, Compound, or Mixture? Diamond

43. Element, Compound, or Mixture? Diamond

44. Element, Compound, or Mixture? Tea

45. Element, Compound, or Mixture? Tea

46. Element, Compound, or Mixture? Salt

47. Element, Compound, or Mixture? Salt

48. Element, Compound, or Mixture? Neon Gas

49. Element, Compound, or Mixture? Neon Gas

50. Element, Compound, or Mixture? Salad

51. Element, Compound, or Mixture? Salad

52. Element, Compound, or Mixture? Pure Water

53. Element, Compound, or Mixture? Pure Water

54. Element, Compound, or Mixture? Aluminum

55. Element, Compound, or Mixture? Aluminum

56. Element, Compound, or Mixture? Lemonade

57. Element, Compound, or Mixture? Lemonade

58. Element, Compound, or Mixture? Silver

59. Element, Compound, or Mixture? Silver

60. Element, Compound, or Mixture? Sand

61. Element, Compound, or Mixture? Sand

62. Can you identify the following? You will be shown another series of slides. Tell if each show an atom or a molecule.

63. Atom or Molecule? CO 2

64. Atom or Molecule? CO 2 Carbon dioxide

65. Atom or Molecule?

66. CH4 methane

67. Atom or Molecule? Fe

68. Fe Iron

69. Atom or Molecule?

70. molecules of one type of atom (same element)

71. Atom or Molecule? CO

72. CO Carbon monoxide

73. Atom or Molecule?

74. mixture of atoms (green) and molecules (purple) (element & compound)

75. Atom or Molecule? Co

76. Co Cobalt

77. Atom or Molecule?

79. Surprise! It’s Hydrogen!

80. Atom or Molecule? N2N2N2N2

81. N 2 Nitrogen

82. Atom or Molecule? C 6 H 12 O 6

83. Atom or Molecule? C 6 H 12 O 6 Simple sugar: glucose, fructose, sucrose

84. Atom or Molecule?

85. mixture of two types of molecules (two different elements)

86. Atom or Molecule? Hg

87. Atom or Molecule? Hg Mercury

88. Atom or Molecule?

89. Nitrogen

90. Atom or Molecule? Fe 2 O 3

91. Atom or Molecule? Fe 2 O 3 Iron oxide - rust

92. Atom or Molecule?

93. molecules of water

94. Atom or Molecule? O2O2 O2O2

95. O 2 Oxygen

96. Atom or Molecule?

97. mixture of two types of atoms (two different elements

98. Atom or Molecule? Na

99. Atom or Molecule? Na Sodium

100. Atom or Molecule? O3O3O3O3

101. O 3 Ozone

102. Atom or Molecule?

103. one type of atom (same element)

104. Atom or Molecule? He

105. He Helium

106. Atom or Molecule?

107. DNA deoxyribonucleic acid

108. Notes Detailed notes are located at: http://www.middleschoolscience.com/elements-compounds- mixtures-notes-isn.pdf Flow Chart: http://www.middleschoolscience.com/matter-flow-chart- isn.pdf