A flask with a tight-fitting stopper contains a gas

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A flask with a tight-fitting stopper contains a gas. The gas and flask are initially at room temperature. The gas and flask are cooled. Which row describes the average speed of the gas particles and the pressure of the gas as the temperature decreases?
average speed of the gas particlespressure of the gas
Adecreasesdecreases
Bdecreasesstays the same
Cincreasesincreases
Dincreasesstays the same
(A) average speed decreases; pressure decreases (B) average speed decreases; pressure stays the same (C) average speed increases; pressure increases (D) average speed increases; pressure stays the same

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