Chemistry HW#4

How does the gas propellant move when an aerosol can is used? a.from a region of high pressure to a region of lower pressure b.from a region of low pressure to a region of equally low pressure c.from a region of low pressure to a region of higher pressure d.from a region of high pressure to a region of equally high pressure

A

If oxygen is removed from a sample of air as iron rusts, what happens to the partial pressure of oxygen in the air? a.It decreases. b.It stays the same. c.It increases. d.The change cannot be determined.

A

If the volume of a container of gas is reduced, what will happen to the pressure inside the container? a.The pressure will increase. b.The pressure depends on the type of gas. c.The pressure will decrease. d.The pressure will not change.

A

What does the ideal gas law allow a scientist to calculate that the other gas laws do not? a.number of moles b.pressure c.temperature d.volume

A

What happens when a piston is used to decrease the volume of a contained gas? a.Gas particles collide more frequently. b.The piston's pressure on the gas becomes greater than the pressure exerted by the gas on the piston. c.Fewer gas particles exert a force on the piston. d.Gas particles leak out of the container.

A

Which of the following is constant for 1 mole of any ideal gas? a. PV/T b.PVT c. PT/V d. VT/P

A

Which of the following molecules would have the greatest velocity if each atom had the same kinetic energy? a.hydrogen b.ammonia c.chlorine d.bromine

A

As the temperature of the gas in a balloon decreases, which of the following occurs? a.The gas pressure inside the balloon increases. b.The average kinetic energy of the gas decreases. c.The volume of the balloon increases. d.The density of the balloon decreases.

B

At a certain temperature and pressure, 0.20 mol of carbon dioxide has a volume of 3.1 L. A 3.1-L sample of hydrogen at the same temperature and pressure a.contains the same number of atoms. b.contains the same number of molecules. c.has the same mass. d.has a higher density.

B

If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant? a.The change cannot be predicted. b.It increases. c.It stays the same. d.It decreases.

B

The combined gas law relates which of the following? a.pressure and volume only b.temperature, pressure, and volume c.temperature and pressure only d.volume and temperature only

B

What happens to the temperature of a gas when it is compressed? a.The temperature decreases. b.The temperature increases. c.The temperature becomes unpredictable. d.The temperature does not change.

B

When the Kelvin temperature of an enclosed gas doubles, the particles of the gas a.decrease in average kinetic energy. b.move faster. c.decrease in volume. d.strike the walls of the container with less force.

B

At high pressures, how does the volume of a real gas compare with the volume of an ideal gas under the same conditions? a.It depends on the type of gas. b.There is no difference. c.It is much greater. d.It is much less.

C

At low temperatures and pressures, how does the volume of a real gas compare with the volume of an ideal gas under the same conditions? a.It depends on the type of gas. b.It is greater. c.It is less. d.There is no difference.

C

If a sealed syringe is heated, in which direction will the syringe plunger move? a.in b.The plunger will not move. c.out d.The direction cannot be predicted.

C

If a sealed syringe is plunged into cold water, in which direction will the syringe piston slide? a.The direction cannot be predicted. b.out c.in d.No movement will occur.

C

The volume of a gas is reduced from 4.0 L to 0.5 L while the temperature is held constant. How does the gas pressure change? a.It decreases by a factor of eight. b.It increases by a factor of four. c.It increases by a factor of eight. d.It increases by a factor of two.

C

Which law can be used to calculate the number of moles of a contained gas? a.Boyle's law b.Charles's law c.ideal gas law d.combined gas law

C

Which of the following can occur with a real gas but not with an ideal gas? a.cooling b.compression c.condensation d.heating

C

Which of the following gases will effuse the most rapidly? a.bromine b.chlorine c.hydrogen d.ammonia

C

Why does the pressure inside a container of gas increase if more gas is added to the container? a.There is an increase in the force of the collisions between the particles and the walls of the container. b.There is an increase in the temperature of the gas. c.There is an increase in the number of collisions between particles and the walls of the container. d.There is a decrease in the volume of the gas.

C

Why is a gas easier to compress than a liquid or a solid? a.Its volume increases more under pressure than an equal volume of solid does. b.The space between gas particles is much less than the space between liquid or solid particles. c.The volume of a gas's particles is small compared to the overall volume of the gas. d.Its volume increases more under pressure than an equal volume of liquid does.

C

If 4 moles of gas are added to a container that already holds 1 mole of gas, how will the pressure change inside the container? a.The pressure will be four times higher. b.The pressure will not change. c.The pressure will double. d.The pressure will be five times higher.

D

If a balloon is heated, what happens to the pressure of the air inside the balloon if the volume remains constant? a.It stays the same. b.The change cannot be predicted. c.It decreases. d.It increases.

D

If a balloon is squeezed, what happens to the pressure of the gas inside the balloon? a.It stays the same. b.It decreases. c.The pressure depends on the type of gas in the balloon. d.It increases.

D

If oxygen is removed from a sample of air as iron rusts, what happens to the total pressure of the air? a.It increases. b.It stays the same. c.The change cannot be determined. d.It decreases.

D

If the atmospheric pressure on Mt. Everest is one-third the atmospheric pressure at sea level, the partial pressure of oxygen on Everest is ____. a.one-half its pressure at sea level b.equal to its pressure at sea level c.one-sixth its pressure at sea level d.one-third its pressure at sea level

D

If the volume of a container of air is reduced by one-half, what happens to the partial pressure of oxygen within the container? a.It is reduced by one-half. b.It is reduced by one-fourth. c.It does not change. d.It is doubled.

D

In general, for a gas at a constant volume, the a.volume of the gas is directly proportional to its temperature in kelvins. b.pressure of the gas is inversely proportional to its temperature in kelvins. c.volume of the gas is inversely proportional to its temperature in kelvins. d.pressure of the gas is directly proportional to its temperature in kelvins.

D

The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change? a.It varies depending on the type of gas. b.It does not change. c.It is doubled. d.It is reduced by one half.

D

Under what conditions of temperature and pressure is the behavior of real gases most like that of ideal gases? a.high temperature and high pressure b.high temperature and low pressure c.low temperature and low pressure d.low temperature and high pressure

D

What happens to the partial pressure of oxygen in a sample of air if the temperature is increased? a.It stays the same. b.It decreases. c.The change cannot be determined. d.It increases.

D

What happens to the pressure of a gas inside a container if the temperature of the gas decreases? a.The pressure increases. b.The pressure does not change. c.The pressure cannot be predicted. d.The pressure decreases.

D

When the pressure and number of particles of a gas are constant, which of the following is also constant? a.the sum of the volume and temperature in kelvins b.the difference of the volume and temperature in kelvins c.the product of the volume and temperature in kelvins d.the ratio of the volume and temperature in kelvins

D

When the temperature and number of particles of a gas are constant, which of the following is also constant? a.the ratio of the pressure and volume b.the sum of the pressure and volume c.the difference of the pressure and volume d.the product of the pressure and volume

D

When the volume and number of particles of a gas are constant, which of the following is also constant? a.the product of the pressure and temperature in kelvins b.the difference of the pressure and temperature in kelvins c.the sum of the pressure and temperature in kelvins d.the ratio of the pressure and temperature in kelvins

D

Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time? a.neon b.oxygen c.hydrogen d.argon

D

Which of these changes would cause a decrease in the pressure of a contained gas? a.The temperature is increased. b.The average kinetic energy of the gas in increased. c.More of the gas is added to the container. d.The volume of the container is increased.

D

Which of these is a difference between particles of real and particles of ideal gases? a.Particles of real gases electrical charges and those of ideal gases do not. b.Particles of real gases have mass and those of ideal gases do not. c.Particles of real gases have thermal energy and those of ideal gases do not. d.Particles of real gases have volume and those of ideal gases do not.

D

Why does air escape from a tire when the tire valve is opened? a.There are more particles of air outside the tire than inside the tire. b.The temperature is higher outside the tire than inside the tire. c.The pressure outside the tire is greater than the pressure inside the tire. d.The pressure outside the tire is lower than the pressure inside the tire.

D