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Unformatted text preview: Classification of Matter Cañada 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 Cañada 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
- Chemical substance, Cañada Chemistry Department