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You are here: Home / All Freebies / Lab: Heat of Crystallization

October 27, 2011 · Leave a Comment

Lab: Heat of Crystallization

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Crystallization (solidification) is the exact opposite of the process of fusion (melting). When a substance undergoes a phase change, heat is either released or absorbed by the substance. Crystallization involves a phase change from liquid to solid; heat is released by the substance as it solidifies. When the process of crystallization takes place in a calorimeter, the heat released by the substance that is solidifying is absorbed by the water in the calorimeter. As a result, the temperature of the water increases. The temperature change can be used to determine the heat of crystallization of the substance undergoing the phase change.

Purpose: The student will determine the heat of crystallization of a wax sample.

Materials: 25 x 200 test tube, 250 mL Beaker, Ring stand and ring, Hot plate, 100 mL Graduated cylinder, Thermometer, Styrofoam cup, Safety goggles, Wax sample, Balance, Test tube tongs

Your download will include Title, Purpose, Introduction, Materials, Safety Precautions, Procedure, Analysis Questions, Student Data Pages, Answers to all Questions, and Teacher Preparation Notes.

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