Math Throughout Bollywood

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Richard Ruales Period 9 October 24, 2012 Title: The Melting Temperature of a Pure Substance Purpose: The purpose of this experiment was to describe the noticeable changes in a graph showing the phase change of Paradichlorobenzene from a liquid to a solid. Introduction: Paradichlorobenzene is a substance that is used for a variety of purposes. It is used in pesticides as well as to repel moths, rodents, dogs, mildews, mold, etc. It is also used in portable toilets to reduce odor. The melting point and freezing point, or equilibrium, of Paradichlorobenzene lies in the range of 52-56 °C. Its molecular formula is C6H4C12, and its atomic weight is 147.01 amu. Materials: The following materials were used for this experiment, * Paradichlorobenzene * 2 400mL beakers three-fourths filled with water * 2 thermometers * Ring stand * Timer * Safety goggles * Hot plate * Recording sheet * Pencil * Test tube * Ring clamp Methods/Procedure: The procedure used for this lab was detailed on the handout entitled “The Melting Temperature of a Pure Substance”. On direction “b” on “Part 1” the temperature of the hot plate was not set on medium, but rather on 8. For the first part of the lab, the first 400mL beaker was placed on the hot plate at setting “8”. The test tube containing the Paradichlorobenzene was then placed into the hot water bath using the ring clamp until it was completely melted and its temperature reached the 65-70 °C range, which was determined using the first thermometer. The second 400mL beaker was placed on the base of the ring stand, and the test tube was then clamped over it. Once ready, the temperature of the Paradichlorobenzene sample was recorded using the thermometer and the lower half of the test tube was immersed in the water bath. Simultaneously, the timer was started, and the temperature of the substance,
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