Decide which of the following statements are true and which are false. In order

Question

Decide which of the following statements are true and which are false. In order for two separate 1.0 L samples of O2(g) and H2(g) to have the same average velocity, the O2(g) sample must be at a lower temperature than the H2(g) sample. As temperature decreases, the average kinetic energy of a sample of gas molecules decreases. Real gas molecules have a volume and exert attractive forces on one another. Real gas molecules behave most ideally at high temperature and low pressure. At constant temperature, the lighter the gas molecules, the larger the average velocity. At constant temperature, the heavier the gas molecules, the smaller the average kinetic energy.

Explanation / Answer

In order for two separate 1.0 L samples of O2(g) and H2(g) to have the same average velocity, the O2(g) sample must be at a lower temperature than the H2(g) sample. FALSE.
(Two gases have the same average KE at the same temperature, but the lighter gas will have the greater the average speed. Only at a lower temperature will the average speed of H2 be the same as O2 at a higher temperature. )

As temperature decreases, the average kinetic energy of a sample of gas molecules decreases. TRUE
(Average KE is directly proportional to the absolute T. The heat energy in a gas is in the form of molecular motion).

Real gas molecules have a volume and exert attractive forces on one another. TRUE
(Definition of real gases compared to ideal gases.)

Real gas molecules behave most ideally at high temperature and low pressure. TRUE

At constant temperature, the lighter the gas molecules, the larger the average velocity. TRUE.
(Speed and mass are inversely proportional: KE = ½mv².)

At constant temperature, the heavier the gas molecules, the smaller the average kinetic energy. FALSE.
(Two gases at the same temperature have the same average KE.)

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