Properties of Compounds Essay

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Properties of Compounds Purpose: The purpose of this lab was to determine whether an unknown substance was ionic or covalent compound based on some common characteristic such as melting point, solubility, and conductivity. Data: Table 1: Properties of Compounds Compound Physical appearance Melting point Solubility in water Solubility on cyclohexane Conducts electricity? H2O Clear liquid Nearly none None Cyclohexane Clear liquid None A Small crystals >277 °C Tube1: Partially Tube 2: Nearly none Strongly B White powder >277 °C Tube 3: Nearly none Tube 4: Nearly none Strongly C White crystals 187.06 °C Tube 5: Freely Tube 6: Partially None D Crystals 195.31 °C Tube 7: Nearly none Tube 8: Freely None E Small crystals >277 °C Tube 9: Freely Tube 10: Nearly none Strongly Results: After dipping the conductivity apparatus into each of the tubes that contained water, the compounds that conducted electricity were Compounds A, B and E. When a compound mixed with water conducts electricity it is considered an ionic compound. If a compound is not ionic when it dissolved in water it will not form ions, but will instead break up into molecules. Therefore compounds H2O, cyclohexane, C, and D are molecular compounds. Later testing the solubility of the compounds the lab results were the following. Solubility in water: compound A dissolved partially, compounds B and D dissolved nearly none, while compounds C and E dissolved freely in water. Solubility of the compounds in cyclohexane were: H2O nearly non dissolved so it formed layers of the two compounds, compounds A, B and C nearly non dissolved, while compound C partially dissolved, and compound D freely dissolved in cyclohexane. Finally arranging the compounds in order of increasing melting points are: Compound C with 187.06 °C, followed by compound D with 195.31, and Compound A, B and
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