Deck 6: Air a Study of the Gases in Our Atmosphere

Question 1

Which is true about the air at a high altitude versus the air at a lower altitude?

A)Air contains a higher number of nitrogen molecules at higher altitudes.
B)There are fewer overall molecules of air at high altitude.
C)The percent of each gas present in air changes from high to low altitude.
D)The number of ozone molecules at high altitude is higher than at low altitude because the ozone layer is closer.

Answer 1

There are fewer overall molecules of air at high altitude.

Question 2

When methane forms in the ground, it forms from

A)the decomposition of organic matter.
B)the reaction of water and carbon dioxide in the water table and below.
C)out-gassing of compounds released from the earth's core.
D)the combination of formaldehyde that is released from the mantle with other compounds from the Earth's surface.

Answer 2

the decomposition of organic matter.

Question 3

Which location will have the highest atmospheric pressure?

A)Chicago airport (619 feet)
B)Grand Canyon National Park (6606 feet)
C)San Francisco airport (11 feet)
D)Atlanta airport (1025 feet)
E)Boise airport (2858 feet)

Answer 3

San Francisco airport (11 feet)

Question 4

List the three phases of matter, from slowest to fastest particle speed.

A)solid, liquid, gas
B)liquid, solid, gas
C)gas, liquid, solid
D)solid, gas, liquid

Question 5

Which gas makes up the largest portion of clean, unpolluted air?

A)oxygen
B)nitrogen
C)carbon dioxide
D)carbon monoxide
E)argon

Question 6

Gases mix thoroughly with one another.

Question 7

At sea level, the atmospheric pressure is usually equal to about

A)100 millimeters of mercury
B)2 atmospheres
C)350 millimeters of mercury
D)760 millimeters of mercury
E)None of the above

Question 8

Explain why atmospheric pressure changes with altitude.

A)as altitude increases, atmospheric pressure decreases
B)as altitude increases, atmospheric pressure increases
C)as altitude decreases, atmospheric pressure decreases
D)none of the above

Question 9

If the pressure in Denver is 0.83 atm, how many mm of mercury (Hg)is this?

A)760 mm Hg
B)0.83 mm Hg
C)1 mm Hg
D)631 mm Hg
E)22.4 mm Hg

Question 10

Which instrument is used to measure atmospheric pressure?

A)a gas chromatograph
B)a thermometer
C)a barometer
D)a pH meter
E)a voltmeter

Question 11

Due to the force of gravity, which is true about the particles of a sample of gas at sea level versus those at higher altitude?

A)The atoms and molecules of a gas will move more quickly at sea level than at higher altitude.
B)The mean free path between atoms and molecules of a gas will be longer at sea level.
C)The volume of a sample of gas will be larger at sea level than at higher altitude.
D)The number of particles in a particular volume will be greater at higher altitude than at sea level.
E)The particles of the gas at sea level will be closer together than those at higher altitude.

Question 12

Gases undergo a higher number of collisions when the atmospheric pressure is higher.

Question 13

Which location will have the lowest atmospheric pressure?

A)Chicago airport (619 feet)
B)Grand Canyon National Park (6606 feet)
C)San Francisco airport (11 feet)
D)Atlanta airport (1025 feet)
E)Boise airport (2858 feet)

Question 14

During the process of diffusion, gas particles move in a straight line from one point to another (for example from one side of a room to the other).

Question 15

The primary component of natural gas is

A)octane
B)propane
C)methane
D)butane

Question 16

Identify whether the substance described is a solid, liquid or gas at room temperature: A substance that must be stored in a sealed, leak-proof container.

A)solid
B)liquid
C)gas

Question 17

A person wearing strong perfume enters a room where you are sitting.At what time of year would you smell this perfume more quickly?

A)You would smell this more quickly in the winter when the heat is on (keeping the room at a toasty 74 degrees).
B)You would smell this more quickly in the summer when the air conditioner is running (keeping the room at a nice, cool 68 degrees).
C)None of the above

Question 18

Mercury is a better choice for use in barometers than water because

A)It is less dense.
B)It vaporizes much more slowly.
C)It is cheaper.
D)It is more colorful and easier to see.
E)It is poisonous.

Question 19

The percent composition of air is different at higher altitude than it is at sea level.

Question 20

All particles of a gas in a particular sample will move at the same speed.

Question 21

If the average molecular speed of argon gas at 25°C is 350 m/s, estimate the average molecular speed at 35°C.

A)100 m/s
B)200 m/s
C)450 m/s

Question 22

Indicate which gas particles are moving at the faster speed.

A)8 billion He gas atoms at 298 K
B)8 billion He gas atoms at 95°F

Question 23

Which substance would be most likely to be counted using the mole?

A)donuts
B)marbles
C)oxygen molecules
D)cars
E)telephones

Question 24

Which describes an experiment in which only pressure and temperature change?

A)taking a shampoo bottle from sea level to altitude
B)putting air in your tires
C)heating a sealed glass sphere
D)putting a balloon in liquid nitrogen
E)none of these

Question 25

Methane is more dangerous in certain ways than carbon dioxide because

A)it is lighter and moves more easily through the atmosphere.
B)it dissolves in water more quickly.
C)it can be produced in a home laboratory without sophisticated equipment.
D)it is a more potent greenhouse gas.

Question 26

If a balloon at STP has a volume of 89.6 L, how many moles of gas does it contain?

A)22.4 moles
B)1.0 mole
C)89.6 moles
D)4.0 moles
E)6.02 × 10²³ moles

Question 27

The lungs of a scuba diver expand as he rises from 100 m below the surface to 10 m below the surface.The gas law that describes this scenario is _____.

Question 28

What volume will 10.0 moles of a gas fill at STP?

A)2.4 L
B)22.4 L
C)224 L
D)100 L
E)10.0 L

Question 29

A beach containing 3.0 moles of sand grains would have how many individual grains of sand?

A)6.02 × 10²³
B)3.0
C)3.0 × 6.02 × 10²³
D)1.8 × 10²³

Question 30

If a sealed box at STP holds 8.0 moles of clean air, how many molecules of nitrogen does it contain?

A)8.4 × 10²³ oxygen molecules
B)6.02 × 10²³ oxygen molecules
C)1.3 × 10²³ oxygen molecules
D)3.8 × 10²⁴ oxygen molecules
E)4.8 × 10²⁴ oxygen molecules

Question 31

A balloon shrinks when taken from inside a hot car and put into a freezer.The gas law that describes this scenario is_____.

Question 32

Which of the following gases would move at the fastest speed, assuming the temperature of each gas is the same?

A)oxygen
B)nitrogen
C)carbon dioxide

Question 33

Which describes an experiment in which only moles of gas and pressure change?

A)taking a sealed shampoo bottle from sea level to altitude
B)putting air in your tires
C)heating a sealed glass sphere
D)pouring liquid nitrogen over a balloon
E)none of these

Question 34

If a sealed box at STP holds a total of 6.7 moles of clean air, how many oxygen molecules does it contain?

A)8.4 × 10²³ oxygen molecules
B)6.02 × 10²³ oxygen molecules
C)1.3 × 10²³ oxygen molecules
D)1.4 × 10²⁴ oxygen molecules
E)4.0 × 10²⁴ oxygen molecules

Question 35

At what temperature is a gas considered to be at STP?

A)25°C
B)298 K
C)0°C
D)0 K
E)100°C

Question 36

A rigid, sealed box at 25°C is heated to 50°C.Which gas variable changes?

A)pressure
B)volume
C)moles of gas

Question 37

A balloon at STP holds 2.4 × 10²⁴ ozone molecules.About how many moles of ozone does it contain?

A)1.0 mole
B)2.0 moles
C)3.0 moles
D)4.0 moles
E)22.4 moles

Question 38

Of the four gas variables, which are inversely proportional to one another?

A)P and V
B)P and T
C)V and T
D)V and n

Question 39

Another name for hydraulic fracturing, the process by which natural gas is removed from underground is

A)hydrolyzing.
B)fracking.
C)shale cracking.
D)benzenosis.

Question 40

Which describes an experiment in which only volume and temperature change?

A)taking a shampoo bottle from sea level to altitude
B)putting air in your tires
C)heating a sealed glass sphere
D)pouring liquid nitrogen over a balloon
E)none of these

Question 41

For the image shown below, choose which line represents the gas at the lowest temperature.The x-axis represents the molecular speed in m/s and the y-axis represents the number of atoms.

A)The tallest, narrowest line
B)The shortest, widest line
C)The second tallest, second narrowest line
D)The third tallest, third narrowest line

Question 42

For the image shown below, choose which line represents the gas with the lowest molar mass.The x-axis represents the molecular speed in m/s and the y-axis represents the number of atoms.

A)The tallest, narrowest line
B)The shortest, widest line
C)The second tallest, second narrowest line
D)The third tallest, third narrowest line