Exam 10: Temperature and Kinetic Theory

The temperature is such that the rms speed of nitrogen molecules is 900. m/s at 750. mm Hg pressure. If the pressure increases to 780. mm Hg while the temperature remains constant, what is the rms speed now? [Molecular weight of nitrogen molecule is 28.]

Diffusion is described by

Consider a flat steel plate with a hole through its center. When the plate's temperature is decreased, the hole will

When the engine of your car heats up, the spark plug gap will

How many moles are there in 2.0 kg of copper? (The atomic weight of copper is 63.5 and its specific gravity is 8.9.)

In the equation PV = NkT, the k is known as

Water has its ________ density at 4.° C.

A container of an ideal gas at 1 atm is compressed to one-third its volume, with the temperature held constant. What is its final pressure?

Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen, compared to hydrogen,

A container is filled with a mixture of helium and oxygen gases. A thermometer in the container indicates that the temperature is 22.° C. Which gas molecules have the greater average kinetic energy?

On a winter -3.° C morning, the pressure in a car tire reads 28. psi on a pressure gauge. After several hours of highway traveling, the pressure reads 35. psi. Assuming the volume remains constant and normal atmospheric pressure of 15. psi, what is the tire temperature?

The volume coefficient of thermal expansion for gasoline is 9.50 × 10^-4 per degree C. By how much does the volume of 1 L of gasoline change when the temperature rises from 20.°C to 40.°C?

Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving

How much compressional stress builds up in a thick aluminum bar held between 2 immovable walls if the temperature increases by 20. C°? ( $\alpha$ = 24. × 10^-6 C^-1, Y = 7 × 10¹⁰ N/m²)

Avogadro's number has what units?

Two liters of a perfect gas are at 0° C and 1.0 atm. If the gas is nitrogen, N₂, determine: (a) the number of mol; (b) the number of molecules; and (c) the mass of the gas.

A sample of a diatomic ideal gas occupies 33.6 L under standard conditions. How many moles of gas are in the sample?

A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature. What happens to the average speed of the molecules in the sample?

A sample of an ideal gas is heated and its Kelvin temperature doubles. What happens to the average speed of the molecules in the sample?

A mixture of helium and another gas diffuses through a porous barrier. The helium diffuses 3.16 times faster than the other type molecule. Identify the other gas.