CLASSIFICATION OF MATTER LEARNING OBJECTIVE I can differentiate between elements, compounds and mixtures. I can compare and contrast solutions, suspensions, and colloids. STANDARD CLE Evaluate pure substances and mixtures. AGENDA ELEMENTS, COMPOUNDS, AND MIXTURE GRAFFITI WALL DIRECT INSTRUCTION GROUP WORK INDIVIDUAL WORK EXIT TICKET COMPOSITION OF MATTER PURE SUBSTANCES MIXTURES PURE SUBSTANCES PURE SUBSTANCE: Is a type of matter with a fixed composition. A pure substance can be either an element or a compound. EXAMPLES: Aluminum (Al), Helium (He), Water (H 2 O), and Salt (NaCl) PURE SUBSTANCE ELEMENT: A substance that cannot be separated or broken down into simpler substances. If it is on the Periodic table, it is an element ELEMENTS ALLOTROPES: Allotropes are different forms of the same element. Different bonding arrangements between atoms result in different structures with different chemical and physical properties. COMPOUNDS COMPOUNDS: Are substances in which atoms of two or more elements are combined in a fixed proportion. EXAMPLES: MIXTURES MIXTURE: Is a combination of two or more substances that are not chemically combined. TYPES OF MIXTURES: There are two types of mixtures: HETEROGENEOUS AND HOMOGENEOUS MIXTURES/HETEROGENEOUS HETEROGENEOUS MIXTURES: A mixture in which different materials can be distinguished easily. (HETERO meaning different) EXAMPLES: MIXTURES/HOMOGENEOUS HOMOGENEOUS MIXTURES: Contain two or more gaseous, solid, or liquid substances blended evenly throughout. (HOMO meaning same) EXAMPLES: HOMOGENEOUS MIXTURES/ SOLUTIONS SOLUTIONS: Is another term to describe heterogeneous mixtures. HOMOGENEOUS MIXTURES/COLLOIDS COLLOIDS: Are a type of mixture with particles that are larger than those of a solution but not heavy enough to settle out. DETECTING COLLOIDS: Colloids are detected using the TYNDALL EFFECT: The Tyndall effect is the scattering of light by the particle of a colloid. A light beam aimed at a glass of milk or a fog bank is scattered. COLLOIDS EXAMPLES: JELLO MILK CLOUDS HETEROGENEOUS MIXTURES/SUSPENSIONS SUSPENSIONS: Are mixtures in which particles of a material are dispersed throughout a liquid or gas but are large enough that they settle out. EXAMPLES: Italian salad dressing, snow globe, and sand and water.