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On the periodic table, where can you find information about the phases (solid, liquid, gas) of elements such as water at room temperature?
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2. Atoms & Elements
Periodic Table: Phases
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At room temperature and standard atmospheric pressure, which phase(s) does H_2O exist in?
A
Solid only
B
Liquid and gas
C
Liquid only
D
Gas only
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Understand the question: It asks about the phase(s) in which H_2O (water) exists at room temperature and standard atmospheric pressure.
Recall the typical room temperature range, which is approximately 20-25°C, and standard atmospheric pressure, which is 1 atm.
Know the phase change points of water: the melting point (0°C) and the boiling point (100°C) at 1 atm pressure.
Since room temperature is above 0°C but below 100°C, water exists primarily as a liquid under these conditions.
Also consider that water can evaporate at room temperature, meaning some molecules enter the gas phase, so both liquid and gas phases coexist.
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