Question 1

An approximation of absolute zero was made from an extrapolation of
A)P vs.1/V
B)V vs.T
C)n vs.V
D)V vs.1/T

Accepted Answer

B

Question 2

The pressure in the eye of a hurricane is less than atmospheric pressure.Which one of the following pressure readings could not have been taken in the eye of a hurricane? A)15 lbs/in² B)69 cm Hg C)690 mm Hg D)9)22 × 10⁴ Pa

Accepted Answer

Atmospheric pressure at sea level is approximately 14.7 lbs/in² or 1013.25 hPa, and the pressure in the eye of a hurricane can drop significantly below this level. Therefore, option A, which is higher than atmospheric pressure, could not have been taken in the eye of a hurricane. Option B, C, and D all represent pressure readings that are lower than atmospheric pressure and could potentially be taken in the eye of a hurricane.

Question 3

What is the pressure in a gas container that is connected to an open-end U-tube manometer if the pressure of the atmosphere is 752 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?
A)666 mm Hg
B)743 mm Hg
C)761 mm Hg
D)838 mm Hg

Accepted Answer

A

Question 4

Which of the following instruments directly measures the pressure of a gas?
A)spectrometer
B)manometer
C)polarimeter
D)gas chromatograph

Accepted Answer

A manometer directly measures the pressure of a gas by balancing the pressure of the gas against a liquid column or a spring system. Spectrometers, polarimeters, and gas chromatographs are used to measure different properties of gases but not their pressure directly.

Question 5

Which of the following equations represents "Boyle's law"?
A)  = k
B)  = k
C)PV = k
D)V = nk

Accepted Answer

Boyle's law states that the pressure and volume of a gas are inversely proportional at constant temperature. This relationship can be expressed mathematically as PV=k, where P is the pressure, V is the volume, and k is a constant. Therefore, option C represents Boyle's law.

Question 6

If mercury (density = 13.6 g/cm³)at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm³),under the same conditions the height of water will be A)0)180 ft B)2)44 ft C)33.2 ft D)399 ft

Accepted Answer

The height of the liquid in a barometer depends on the density of the liquid and the pressure of the atmosphere. The pressure of the atmosphere is constant, so the height of the liquid is directly proportional to its density. The ratio of densities between mercury and water is 13.6:1, so the height of water will be 1/13.6 times the height of mercury.

Height of mercury = 745 mm Hg / (13.6 g/cm3)
Height of water = (745 mm Hg / (13.6 g/cm3)) / (1 g/cm3)
Height of water = 33.2 ft

Question 7

If the pressure in a gas container that is connected to an open-end U-tube manometer is 106 kPa and the pressure of the atmosphere at the open end of the tube is 742 mm Hg,the level of mercury in the tube will be
A)53 mm higher in the arm open to the atmosphere.
B)53 mm higher in the arm connected to the gas cylinder.
C)636 mm higher in the arm open to the atmosphere.
D)636 mm higher in the arm connected to the gas cylinder.

Accepted Answer

The pressure in the gas container is 106 kPa, which is equivalent to 795 mm Hg. The pressure of the atmosphere at the open end of the tube is 742 mm Hg. Therefore, the difference in pressure between the two arms of the manometer is 795 mm Hg - 742 mm Hg = 53 mm Hg. This means that the level of mercury in the tube will be 53 mm higher in the arm open to the atmosphere.

Question 8

Automobile tires are typically inflated to about 30 pounds of pressure per square inch.What is the typical air pressure of a tire in kPa? A)2)0 × 10^-3 kPa B)2)0 kPa C)2)1 × 10² kPa D)2)1 × 10⁵ kPa

Accepted Answer

To convert psi to kPa, we multiply by 6.895. So, 30 psi is equal to 30 x 6.895 = 206.85 kPa. Choice C matches this value, making it the correct answer.

Question 9

Which is the smallest quantity of pressure?
A)1 atm
B)1 centimeter of Hg
C)1 mm Hg
D)1 pascal

Accepted Answer

Pascal is the SI unit of pressure and is defined as the pressure exerted by a force of 1 Newton per square meter. It is the smallest unit of pressure among the given options.

Question 10

When temperature-volume measurements are made on 1.0 mol of gas at 1.0 atm,a plot V versus T results in a
A)hyperbola.
B)parabola.
C)sine curve.
D)straight line.

Accepted Answer

According to Charles's law, at constant pressure, the volume of a gas is directly proportional to its temperature. Therefore, the relationship between volume and temperature is linear, and a plot of V versus T results in a straight line.

Question 11

In an open end manometer,one end of a U-tube filled with mercury is attached to a gas-filled container and the other end is open to the atmosphere.If the gas pressure in the container is less than atmospheric pressure
A)Hg will be forced out of the open end of the U-tube.
B)the difference between the Hg levels in the two arms will be greater than 76 cm.
C)the Hg level will be higher in the arm connected to the container.
D)the Hg level will be higher in the arm open to the atmosphere.

Accepted Answer

In an open end manometer, the gas pressure in the container is balanced by the weight of the mercury in the arm connected to the container. If the gas pressure is less than atmospheric pressure, then the weight of the mercury in the arm connected to the container will be less, causing the Hg level to be higher in that arm compared to the other arm open to the atmosphere. Therefore, choice C is the best choice. Choices A, B, and D are all incorrect.

Question 12

The SI unit for pressure is the
A)atmosphere.
B)MM Hg.
C)newton.
D)pascal.

Accepted Answer

The SI unit for pressure is kilopascal (kPa) or pascal (Pa). Pascal is defined as one newton per square meter. Atmosphere and mmHg are non-SI units of pressure. Newton is a unit of force and not pressure.

Question 13

When pressure-volume measurements are made on 1.0 mol of gas at constant temperature,a plot V versus P results in a
A)hyperbola.
B)parabola.
C)sine curve.
D)straight line.

Accepted Answer

According to Boyle's Law, at constant temperature, the volume (V) of a given mass of gas is inversely proportional to its pressure (P). This relationship, when plotted as V versus P, results in a hyperbolic curve.

Question 14

Suppose you needed to closely monitor small changes in pressure inside a container using an open end manometer.For the best accuracy,the substance in the manometer should
A)be a solid.
B)be mercury.
C)have a high density.
D)have a low density.

Accepted Answer

The answer of Suppose you needed to closely monitor small...

Question 15

Carbon dioxide is a gas which causes environmental concern because of the greenhouse effect.What is the approximate percentage (by volume)of CO₂ in the atmosphere? A)less than 0.1% B)about 1% C)about 10% D)more than 20%

Accepted Answer

The concentration of carbon dioxide in the atmosphere is approximately 0.04% by volume, which is less than 0.1%.

Question 16

A container filled with gas is connected to an open-end U-tube manometer that is filled with mineral oil.The pressure in the gas container is 773 mm Hg and atmospheric pressure is 754 mm Hg.What will be the difference in the levels of mineral oil in the two arms of the manometer if the densities of Hg and mineral oil are 13.6 g/mL and 0.822 g/mL respectively?
A)1)15 mm
B)15.6 mm
C)19.0 mm
D)314 mm

Accepted Answer

The pressure difference between the gas and the atmosphere is 19 mm Hg (773 mm Hg - 754 mm Hg). To find the difference in mineral oil levels, convert this pressure difference to mineral oil using the density ratio: (19 mm Hg) * (13.6 g/mL / 0.822 g/mL) = 314 mm.

Question 17

Which law does the equation, 
= k represent?
A)Avogadro's law
B)Boyle's law
C)Charles' law
D)Graham's law

Accepted Answer

The equation 11ea7a38_c91f_9a43_aa4c_c569b45909b3_TB4939_11= k represents Avogadro's law which states that the volume of a gas is directly proportional to the number of moles of the gas at constant temperature and pressure. This is evident as the equation contains the term "TB4939_11" which represents the number of moles of the gas.

Question 18

Pressure is defined as
A)force divided by unit area.
B)force times unit area.
C)mass divided by acceleration.
D)mass times acceleration.

Accepted Answer

Pressure is the force applied per unit area, which is represented as force divided by unit area.

Question 19

Which of the following is not equivalent to 1 atm pressure? A)10 cm Hg B)14.7 lb/in² C)101 kPa D)760 mm Hg

Accepted Answer

1 atm is equivalent to 760 mm Hg, 101.3 kPa, and 14.7 lb/in². 10 cm Hg is not equivalent to 1 atm, as 1 atm is equal to 76 cm Hg.

Question 20

Which one of the following is not used to describe the condition of a gas?
A)number of moles
B)polarity
C)temperature
D)volume

Accepted Answer

Polarity is a chemical property that describes the distribution of electrons in a molecule, and is not used to describe the condition of a gas. The other three options are commonly used to describe gases: the number of moles refers to the amount of gas molecules, temperature describes the average kinetic energy of the gas particles, and volume refers to the physical space occupied by the gas.

Quiz 9: Gases: Their Properties and Behavior

An approximation of absolute zero was made from an extrapolation of

The pressure in the eye of a hurricane is less than atmospheric pressure.Which one of the following pressure readings could not have been taken in the eye of a hurricane?

What is the pressure in a gas container that is connected to an open-end U-tube manometer if the pressure of the atmosphere is 752 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?

Which of the following instruments directly measures the pressure of a gas?

Which of the following equations represents "Boyle's law"?

If mercury (density = 13.6 g/cm³) at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm³) ,under the same conditions the height of water will be

If the pressure in a gas container that is connected to an open-end U-tube manometer is 106 kPa and the pressure of the atmosphere at the open end of the tube is 742 mm Hg,the level of mercury in the tube will be

Automobile tires are typically inflated to about 30 pounds of pressure per square inch.What is the typical air pressure of a tire in kPa?

Which is the smallest quantity of pressure?

When temperature-volume measurements are made on 1.0 mol of gas at 1.0 atm,a plot V versus T results in a

In an open end manometer,one end of a U-tube filled with mercury is attached to a gas-filled container and the other end is open to the atmosphere.If the gas pressure in the container is less than atmospheric pressure

The SI unit for pressure is the

When pressure-volume measurements are made on 1.0 mol of gas at constant temperature,a plot V versus P results in a

Suppose you needed to closely monitor small changes in pressure inside a container using an open end manometer.For the best accuracy,the substance in the manometer should

Carbon dioxide is a gas which causes environmental concern because of the greenhouse effect.What is the approximate percentage (by volume) of CO₂ in the atmosphere?

Which law does the equation, = k represent?

Pressure is defined as

Which of the following is not equivalent to 1 atm pressure?

Which one of the following is not used to describe the condition of a gas?