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Freezing Point of Naphthalene Lab Answers

I.    Purpose To determine the freezing  point of a known substance, naphthalene II.   Materials ringstand                     gas source test tube                     test tube clamps thermometer                   naphthalene Bunsen burner                       goggles hose                          stopwatch III.  Procedure 1.    Assemble the Bunsen burner, attaching one end of the hose to the burner and the other to a gas source. 2.    Assemble the…

Decomposition of Potassium Perchlorate Lab Answers

Purpose In this lab we will observe the products of decomposition of potassium perchlorate (KClO4). We will then predict from our results the correct chemical reaction equation. Procedure 1.  Weigh out about 4.0g of KClO4 in a test tube.  Record the accurate weight below. Product                                      Weight Before     Weight After Mass of Test tube + KClO4    …

Chloroflourocarbons: Uses & Dangers

Chloroflourocarbons were discovered in the 1920’s by Thomas Midgley, an organic chemist at General Motors Corporation. He was looking for inert, non-toxic, non-flammable compounds with low boiling points that could be used as refrigerants. He found what he was looking for in the form of two compounds: dichlorodifluoromethane (CFC-12) and trichloromonoflouromethane (CFC-11). In both compounds,…