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BELLWORK 8/22/16 SOLIDS LIQUIDS GASES Volume & Shape
Definite Volume & Shape Spacing between particles Amount of Energy High
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Post – Lab Questions 3CuCl2 (s) + 2Al (s) 2 AlCl3 (l) + 3Cu (s)
Endothermic or Exothermic Reaction? What are the reactants? Products? What do the letters in parentheses mean?
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Classification of Matter
Scientists can classify matter as solid, liquid, or gas, but matter can also be classified as pure substances or mixtures.
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Classification of Matter
Pure Substance – Every sample of the substance has the same composition and characteristics. Example: Pure Water (H2O) Salt (NaCl)
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Pure Substances Pure substances can also be divided into 2 categories: compounds and elements.
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Pure Substances Compound – Two or more elements chemically bonded together. Examples: Carbon Dioxide (CO2) Water (H2O) Salt (NaCl) Sucrose (C12H22O11)
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Pure Substances Elements – Substances made up of only one type of atom. - Cannot be separated by any physical OR chemical process. Examples: Carbon Helium Gold
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Mixtures Mixtures are physical combinations of pure substances that have no definite or constant composition — the composition of a mixture varies according to who prepares the mixture. Even though it may look different, it is still copper and zinc. Each metal retains its own properties like melting point. Example: Copper and Zinc can be mixed together to produce brass.
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Heterogeneous Mixtures
A heterogeneous mixture is a mixture whose composition varies from position to position within the sample. You can separate the mixture by physical means. Ex: Sand and water can be separated by filtration. Iron can be separated out of a mixture by using a magnet. Examples: Sand Granite Wood
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Homogeneous Mixtures A homogeneous mixture, sometimes called a solution, is relatively uniform in composition; every portion of the mixture is like every other portion. Ex: sugar water, saltwater, air, plasma, coffee, alcohol, water, perfume, alloys, milk, etc Seawater distillation plant
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Checkpoint 1. 2. 3. 4. 5. 6.
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ANSWERS 1. oil and water – heterogeneous 2. milk – homogeneous
3. cereal – heterogeneous 4. chicken noodle soup – hetero 5. orange juice (without pulp) – homo 6. sand - heterogeneous
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Ch. 1.2 Wksht #2 Correct your Classwork Assignment
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HOMEWORK Lab Report #2
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