객관식
Sean drew a diagram showing four containers, each with a different gas at the same temperature, pressure, and volume. Container A contains the gas with the lowest molar mass. Which gas does container A most likely represent?
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7. Gases
The Ideal Gas Law
Multiple Choice
When water in a syringe boils at 43°C, which factor is primarily responsible for this phenomenon according to the Ideal Gas Law?
A
The addition of more water molecules increases the boiling point.
B
A higher concentration of dissolved gases causes water to boil at a lower temperature.
C
An increase in the volume of water raises its boiling point.
D
A decrease in pressure inside the syringe lowers the boiling point of water.
검증된 단계별 안내1
Recall that the boiling point of a liquid is the temperature at which its vapor pressure equals the external pressure.
Understand that according to the Ideal Gas Law, \(P V = n R T\), pressure (\(P\)) is related to the number of gas molecules (\(n\)), volume (\(V\)), and temperature (\(T\)).
In a syringe, when the plunger is pulled back, the volume increases, which causes the pressure inside the syringe to decrease if the amount of gas and temperature remain constant.
A decrease in pressure lowers the boiling point of water because the vapor pressure needed to boil is reached at a lower temperature.
Therefore, the primary factor responsible for water boiling at 43°C in the syringe is the decrease in pressure inside the syringe, not changes in the amount of water, dissolved gases, or volume of water itself.
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