Friday, September 23, 2011

Freezing & Melting Point Lab

The last two weeks we've been working on being able to measure and observe physical properties like density and solubility.  The most recent pysical properties we measured were the freezing point and melting points of napthalene, the active ingredient in moth balls.

Freezing point is the temperature that a liquid becomes a solid, where an object's melting point is the temperature where a solid becomes a liquid.  Students were able to relate this unknown chemicals to the freezing & melting points of water, a substance much more well known.