Question 1

Ideal Gas Law calculations require the pressure to be in units of atm.

Accepted Answer

A) True 
 B)False

Question 2

A barometer is a device for measuring __________.

Accepted Answer

A)   atmospheric pressure
B)   blood pressure
C)   gas pressure in a container
D)   gas pressure in the lung
E)   vapor pressure

Question 3

Which of the following is NOT a potential use for a hyperbaric chamber?

Accepted Answer

A)   treatment for burns and infections
B)   counteracting carbon monoxide poisoning
C)   increasing the rate at which a broken bone heals
D)   treating a diver with the bends
E)   treating some cancers

Question 4

Zn(s)  + 2HCl(aq)  → H₂(g)  + ZnCl₂(aq)  When 25.0 g of Zn reacts, how many L of H₂ gas are formed at STP?

Accepted Answer

A)   4.28 L
B)   0.0171 L
C)   8.56 L
D)   22.4 L
E)   0.382 L

Question 5

In Gay-Lussac's Law, the pressure of a gas increases due to an increase in temperature because

Accepted Answer

A)   the molecules strike the walls of the container less often.
B)   the molecules strike the walls of the container more often.
C)   the molecules get bigger.
D)   there is a decrease in the volume of the container.
E)   there is an increase in the number of gas particles.

Question 6

Gas law calculations normally require the use of the Kelvin temperature scale.

Accepted Answer

A) True 
 B)False

Question 7

According to the kinetic theory of gases, particles of a gas

Accepted Answer

A)   are very large.
B)   are very far apart.
C)   lose their valence electrons.
D)   move slowly.
E)   decrease kinetic energy as temperature increases.

Question 8

The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas, if the pressure in the container is kept constant?

Accepted Answer

A)   210. mL
B)   1170 mL
C)   0.0095 mL
D)   0.0470 mL
E)   110. mL

Question 9

In the kinetic molecular theory of gas behavior, the distance between gas molecules is assumed to be __________ the diameter of the gas molecules.

Accepted Answer

A)   22.4 times
B)   small relative to
C)   dependent on
D)   approximately the same as
E)   large relative to

Question 10

As the temperature of a gas increases, the density of the gas will __________.

Accepted Answer

A)   increase
B)   decrease
C)   remain constant

Question 11

A tank contains a mixture of helium, neon, and argon gases. If the total pressure in the tank is 490. mmHg and the partial pressures of helium and argon are 215 mmHg and 102 mmHg, respectively, what is the partial pressure of neon?

Accepted Answer

A)   0.228 mmHg
B)   603 mmHg
C)   377 mmHg
D)   807 mmHg
E)   173 mmHg

Question 12

In a gas, the distance between the particles is

Accepted Answer

A)   very close relative to the size of the molecules.
B)   close relative to the size of the molecules.
C)   fixed relative to the size of the molecules.
D)   small relative to the size of the molecules.
E)   very large relative to the size of the molecules.

Question 13

The volume of a gas with a pressure of 1.2 atm increases from 1.0 L to 4.0 L. What is the final pressure of the gas, assuming constant temperature?

Accepted Answer

A)   1.2 atm
B)   0.30 atm
C)   3.3 atm
D)   4.8 atm
E)   1.0 atm

Question 14

A 5.00-L tank contains helium gas at 1.50 atm. What is the pressure of the gas in mmHg?

Accepted Answer

A)   1.50 mmHg
B)   507 mmHg
C)   760 mmHg
D)   1140 mmHg
E)   7.5 mmHg

Question 15

Oxygen makes up about __________ percent of the atmosphere.

Accepted Answer

The answer of Oxygen makes up about __________ percent of...

Question 16

Indicate the effect on the pressure of the following change.
-A leak occurs and gas escapes (V, T constant) .

Accepted Answer

A)  increases
B)  decreases
C)  no change

Question 17

The atmospheric pressure in Denver, CO is 633 mmHg. What is this pressure in atm?

Accepted Answer

A)   1.20 atm
B)   633 atm
C)   0.833 atm
D)   1.00 atm
E)   127 atm

Question 18

In the kinetic molecular theory of gas behavior, the assumption is made that gas molecules

Accepted Answer

A)   move rapidly in random directions.
B)   are attracted to each other by strong forces.
C)   are close together in their container.
D)   move with a kinetic energy equal to their centigrade temperature.
E)   occasionally come to rest.

Question 19

The air pressure on a rainy day is usually __________ air pressure on a sunny day.

Accepted Answer

A)   higher than
B)   lower than
C)   the same as

Question 20

A 1.20-L container contains 1.10 g of an unknown gas at STP. What is the molecular weight of the unknown gas?

Accepted Answer

A)   1.32 g/mole
B)   0.917 g/mole
C)   22.4 g/mole
D)   20.5 g/mole
E)   1.10 g/mole

Exam 7: Gases

Gas law calculations normally require the use of the Kelvin temperature scale.

Correct AnswerverifiedShow Answer

In a gas, the distance between the particles is

Correct AnswerverifiedShow Answer

The air pressure on a rainy day is usually __________ air pressure on a sunny day.

Correct AnswerverifiedShow Answer

Zn(s) + 2HCl(aq) → H₂(g) + ZnCl₂(aq) When 25.0 g of Zn reacts, how many L of H₂ gas are formed at STP?

Correct AnswerverifiedShow Answer

Indicate the effect on the pressure of the following change. -A leak occurs and gas escapes (V, T constant) .

Correct AnswerverifiedShow Answer

In the kinetic molecular theory of gas behavior, the distance between gas molecules is assumed to be __________ the diameter of the gas molecules.

Correct AnswerverifiedShow Answer

Which of the following is NOT a potential use for a hyperbaric chamber?

Correct AnswerverifiedShow Answer

The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas, if the pressure in the container is kept constant?

Correct AnswerverifiedShow Answer

In Gay-Lussac's Law, the pressure of a gas increases due to an increase in temperature because

Correct AnswerverifiedShow Answer

Ideal Gas Law calculations require the pressure to be in units of atm.

Correct AnswerverifiedShow Answer

A barometer is a device for measuring __________.

Correct AnswerverifiedShow Answer

A 5.00-L tank contains helium gas at 1.50 atm. What is the pressure of the gas in mmHg?

Correct AnswerverifiedShow Answer

In the kinetic molecular theory of gas behavior, the assumption is made that gas molecules

Correct AnswerverifiedShow Answer

Oxygen makes up about __________ percent of the atmosphere.

Correct AnswerverifiedShow Answer

A 1.20-L container contains 1.10 g of an unknown gas at STP. What is the molecular weight of the unknown gas?

Correct AnswerverifiedShow Answer

The atmospheric pressure in Denver, CO is 633 mmHg. What is this pressure in atm?

Correct AnswerverifiedShow Answer

As the temperature of a gas increases, the density of the gas will __________.

Correct AnswerverifiedShow Answer

According to the kinetic theory of gases, particles of a gas

Correct AnswerverifiedShow Answer

The volume of a gas with a pressure of 1.2 atm increases from 1.0 L to 4.0 L. What is the final pressure of the gas, assuming constant temperature?

Correct AnswerverifiedShow Answer

A tank contains a mixture of helium, neon, and argon gases. If the total pressure in the tank is 490. mmHg and the partial pressures of helium and argon are 215 mmHg and 102 mmHg, respectively, what is the partial pressure of neon?

Correct AnswerverifiedShow Answer

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