by George Flatau, HS chemistry teacher, science department chair
This video shows something we've been doing in Advanced Placement Chemistry class recently. Not everything we do is fun to watch, but this is.
Wax is heated to boiling, which is past its flash point, the point at which it can combust without an ignition source. Trapped in the test tube, the wax lacks sufficient access to oxygen, so the test tube is plunged into cold water, shattering it. The water boils on contact with the hot tube and wax, vaporizing some of the water into steam. The steam ejects the wax out of the tube, where it has far greater surface area and access to oxygen. With high energy and access to oxygen, it bursts into flames. It's part of a demonstration of the power of surface area to affect rates of reaction.
Lycopodium powder is dried clubmoss spores. They have very high surface area (the powder is very fine) and relatively high fat content, making them highly flammable when the powder is spread into the air. If the powder is collected in one spot (such as in the bottle), it has low surface area, making it far less flammable and thus far safer.
Aliza Ahmed '26, Uma Ehrig '26, Victor Peng '26, Ruchika Ramachandran '27, and Yvonne Wang '27 participated in the Asian Educators Alliance conference this year in Atlanta, Georgia.
Anna Brook '30, Claire Yu '30, Clio Cherry-Pulay '29, and Liam Mooney '28 took him the championship during the 4th annual USN Middle School Quiz Bowl Championships. Two teams will travel to Chicago to compete in the National Academic Quiz Tournaments Middle School National Championships on Saturday, May 10.
Cpl. Robert Gibson joined University School of Nashville in November as a School Resource Officer, a certified police officer who is primarily assigned to a school and provides safety and security-related functions, including emergency response, safety training, traffic direction, and patrol functions.
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