Students in Ms. Thomas' Honors Chemistry Class recently explored the properties of dry ice
Students have been exploring density, phase changes and properties of matter in chemistry class. Dry ice (solid carbon dioxide) is an excellent example of sublimation, which is a special phase change where the substance starts as a solid and goes directly to a gas phase (no liquid phase observed). Special safety precautions must be taken when handling the solid CO2 since the materials is at - 110o F. In addition to being very cold, carbon dioxide is also more dense than normal air. Students were able to observe demonstrations of its higher density by: seeing how a fog machine works, how it makes a balloon sink, and the general "heaviness" of the gas as it can be poured and travels downward as opposed to rising.