Question
Cadmium telluride undergoes this process in a “close space,” then diffusion and epitaxy, to make photovoltaic thin films. Drugs are stabilized by a form of this process that pumps out H2O (“H two O”) using a lyophilizer (“lie-AW-fuh-lie-zer”). The energy of this process plus ionization is a metal’s contribution to a Born–Haber cycle. Caffeine purified by this process is scooped off an overhead cold finger. Cryogenic (*) CO2 (“C O two”) absorbs heat by undergoing this process at negative 78 degrees Celsius. The heat of this process equals the heat of fusion plus heat of vaporization at the triple point. At room temperature, naphthalene and dry ice undergo this process, the reverse of deposition. For 10 points, name this phase change from a solid to a gas. ■END■
ANSWER: sublimation [or subliming; prompt on drying or freeze-drying by asking, “What is the phase transition?”; prompt on lyophilization until “lyophilizer” is read; prompt on phase transition or phase change; reject “vaporization”; reject “evaporation”; reject “freezing”; reject “boiling”; reject “deposition”]
<Adam Silverman, Science - Chemistry> ~27369~ <Editor: Adam Silverman>
= Average correct buzz position
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