Gas Law Test - Part C

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3. A sample of a pure gas is found to have a lower pressure than that predicted by the ideal gas law. The best explanation for the observation is that the molecules of the gas

(A) have a combined volume that is too large to be considered negligible when compared to the volume of the container

(B) have a low molecular mass and therefore do not strike the container walls with as much force as expected

(C) are attracted to each other and do not exert as much force on the container walls as they would if they had no mutual attractions

(D) are attracted to the sides of the container and strike the container walls with more force than

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4. A balloon filled with 0.25 moles He (g) ) and 1 atm is allowed to rise through the atmosphere. Which of the following explains what happens to the volume of the balloon as it rises from ground level to an altitude where the air temperature is 220 K and the air pressure is 0.1 atm ?

(A) The volume will increase because the decrease in air pressure will have a greater effect than the decrease in temperature.

(B) The volume will remain unchanged because of the counteracting effects of the decrease in temperature and the decrease in air pressure.

(C) The volume will decrease because the decrease in temperature will have a greater effect than the decrease in air pressure.

(D) It cannot be determined whether the volume of the balloon will increase, decrease, or remain the same without knowing the initial volume of the balloon.

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5. The Maxwell-Boltzmann distributions of molecular speeds in samples of two different gases at the same temperature are shown below. Which gas has the greater molar mass?

(A) Gas A

(B) Gas B

(D) It cannot be determined unless the pressure of each sample is known.

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6. The ideal gas law best describes the properties of which of the following gases at 0 C and 1 atm?

Choice (A)

Choice (B)

Choice (C)

Choice (D)

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For Questions 7 and 8:

7. Which of the following best predicts how the partial pressures of the reacting species will be affected if a small amount of Ar (g) is added to the equilibrium mixture at constant volume?

p = partial pressure

(A) pNO2 will decrease and pN2O4 will increase.

(B) pNO2 will increase and pN2O4 will decrease.

(D) No change will take place.

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8. Which of the following experimental techniques will allow the most accurate determination of the concentration of NO2 (g) at equilibrium?

(A) Paper chromatography

(B) Gravimetric analysis

(D) Spectrophotometry

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9. According to the kinetic molecular theory, which statement describes the particles in a sample of an ideal gas?

(A) The particles are constantly moving in circular paths.

(B) The particles collide, decreasing the total energy of the system.

(D) The particles are considered to have negligible volume.

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10. At STP, which ideal gas sample has the same number of molecules as 2.0 liters of CH4(g) at STP?

(A) 1.0 liter of C2H6(g)

(B) 2.0 liters of O2(g)

(D) 6.0 liters of CO2(g)

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11. At which temperature and pressure would a sample of helium behave most like an ideal gas?

(A) 75 K and 500. kPa

(B) 150. K and 500. kPa

(D) 600. K and 50. kPa

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