Have you ever had melted wax drip on you? It's hot! When melted wax solidifies, enough heat may be released to cause severe skin burns. Find out how much heat is released when melted wax solidifies with this three-part demonstration.
• Measure the temperature of “hot wax” as it cools.
• Graph the cooling curve data to estimate the melting point.
• Then do a simple calorimetry test to calculate the heat of fusion of paraffin.
The idea that a liquid releases heat when it solidifies is not obvious—this economical demonstration will really “solidify” the concept of phase changes and their related energy changes for your students! Enough materials are included to perform the demonstration seven times.
Concepts: Phase changes, heat of fusion, calorimetry.
Time Required: 20 minutes
Materials Provided: Paraffin wax, borosilicate test tubes, polystyrene cups, and boiling stones.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 382
Flinn Middle School Catalog/Reference Manual Page 351
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