All about the demos…
June 30, 2009 – 8:39 amSummer school is all upon us. Chemistry demonstrations are boiling on the bench. Today is all physical chemistry.
Heat capacity of copper is measured by dropping 64 grams of metal at 100°C into 100 grams of water in a styrofoam cup at room temperature, and measuring the temperature rise of the whole.
Speed of sound in gas is demonstrated by blowing helium, air, and sulfur hexafluoride through an old wooden organ pipe. The pipe length supports a standing wave, and the frequency of the standing wave is proportional to the speed of sound in the pipe. Fill the pipe with helium and the tone goes way up, with sulfur hexafluoride and the tone goes way down.
No clue what the bucket of ice requested is for. Sometimes that is the way it goes.
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