MCAT Chemistry Question — Pressure Reduction
- Sep 25, 2017
- MCAT Question of the Day
A. If the substance is H2O, it will transition from solid directly into gas.
B. For all substances except H2O, the substance will transition into liquid phase and then the gas phase as the pressure is reduced.
C. For all substances except H2O, the substance will transition from solid directly into gas.
D. If the substance transitions from solid directly into gas, it must be H2O.
Click for Explanation
Thus (A) remains as the only option, and it is true. Because reductions in pressure favor the less-dense phase, ice will transition directly to gas as the pressure is reduced.
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