Stacy_LBC_2e_Chapter_12.bnk

The weather map below indicates areas of higher and lower atmospheric pressure. Which instrument is used to measure atmospheric pressure?

• barometer

• piston

• rain gauge

• thermometer

Which statement best describes the difference between the atmosphere at sea level and the atmosphere at the top of a tall mountain?

• More molecules are in a given volume of air at sea level and they exert greater pressure.

• The number of molecules in a given volume is the same but they move faster at sea level.

• The number of molecules in a given volume is the same but they move slower at sea level.

• Fewer molecules are in a given volume at sea level but they are under greater pressure.

Which of these tends to occur as altitude increases when climbing a mountain?

• Pressure increases.

• Temperature decreases.

• The number of oxygen molecules increases.

• The volume of a given mass of air decreases.

Why does the level of mercury in a barometer change when atmospheric pressure increases?

• The increase in pressure causes the mercury to expand as its temperature increases.

• Increased air pressure pushes mercury farther into the closed end of the tube.

• Mercury vapor condenses in the closed end of the tube when the pressure increases.

• The change in pressure increases the pull of the vacuum on the closed end of the tube.

The illustration below shows one type of mercury barometer. It consists of a tube of mercury inverted in a dish of mercury. If the atmospheric pressure were to decrease, what would happen to the level of mercury in the tube?

• The level of mercury in the tube would rise.

• The level of mercury in the tube would remain the same.

• The level of mercury in the tube would fall.

• There is not enough information to answer the question.

The illustration below shows one type of mercury barometer. It consists of a tube of mercury inverted in a dish of mercury. What would cause the level of mercury in the tube to rise?

• An increase in atmospheric pressure.

• A decrease in atmospheric pressure.

• Atmospheric pressure remaining constant.

• There is not enough information to answer the question.

The illustration below shows one type of mercury barometer. It consists of a tube of mercury inverted in a dish of mercury. Which of these best approximates the pressure that is exerted on the mercury inside of the tube at the top?

• 29.4 lb/in²

• 14.7 lb/in²

• 1.0 lb/in²

• 0 lb/in²

You have four sealed plastic boxes containing air all at the same temperature. Which box has the greatest gas pressure?

• Box A has a volume of 10 L and contains 2 mol of air.

• Box B has a volume of 5 L and contains 1 mol of air.

• Box C has a volume of 10 L and contains 1 mol of air.

• Box D has a volume of 5 L and contains 2 mol of air.

You have four sealed plastic boxes containing air all at the same temperature. Which box has the lowest gas pressure? (1 point)

• Box A has a volume of 10 L and contains 2 mol of air.

• Box B has a volume of 5 L and contains 1 mol of air.

• Box C has a volume of 10 L and contains 1 mol of air.

• Box D has a volume of 5 L and contains 2 mol of air.

How many atoms of helium are there in a container that holds 22.4 L at 273 K and 1.0 atm of pressure?

• 1,204,000,000,000,000,000,000

• 602,000,000,000,000,000,000

• 1,204,000,000,000,000,000,000,000

• 802,000,000,000,000,000,000