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Unformatted text preview: Classification of Matter Caada Chemistry Department Version 3 Experiment 1: Classification of Matter Background Skills/Concepts Classifying Matter Separating Mixtures Based on the Different Solubilities of Substances in Water Using Gravity Filtration to Separate Mixtures Using Paper Chromatography to Separate Mixtures Identifying chemical reactions Relevant Reading Brown & LeMay, Chemistry the Central Science: Chapter 1 Background In Part A of this experiment you will observe a pure substance and classify it as an element or a compound. In Part B of this experiment you will observe a material and classify it as a pure substance, a homogenous mixture, or a heterogeneous mixture. You will then perform a series of experiments on an unknown and classify the components as a pure substance, a homogeneous mixture, or a heterogeneous mixture. In Part C of this experiment you will use paper chromatography, a method of separation of mixtures based on the different solubilities of substances in the solvent (water in this case). You will be separating and classifying two different inks. In Part D of this experiment you will combine materials and determine if a chemical change (or reaction) occurs. Chemical changes are frequently characterized by one or more of the following observations: Change in color Heat produced or absorbed Gas produced Solid formed when two liquids are mixed. Procedure Part A Elements or Compounds Obtain a few crystals of copper (II) sulfate pentahydrate, CuSO 4 5H 2 O. Place the crystals in a test tube and heat in the flame of a Bunsen burner for a few minutes. Allow to cool and observe. Classify the original crystal as an element or a compound. Dispose of the remaining substance in the container marked aqueous metal waste in the hood. Classification of Matter Caada Chemistry Department Version 3 Part B Pure Substances, Homogeneous Mixtures, and Heterogeneous Mixtures Obtain a vial containing the unknown. Record the unknown number on the vial in your data table. Weigh the vial and its contents. Clean, dry and weigh a 250 mL beaker. Transfer the unknown to the 250 mL beaker. Weigh the empty vial. Record your masses in the data table. Observe the unknown and classify it as a pure substance, homogeneous mixture, or heterogeneous mixture. classify it as a pure substance, homogeneous mixture, or heterogeneous mixture....
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- Fall '11