Question 1

The relationship between the "absolute temperature" on the Kelvin scale and the Celsius temperature is given by:

Accepted Answer

A)  T(K) = t(°
C)  + 273.15 
B)  t(°
C)  = T(K) + 273.15 
C)  T(K) = 5/8[t(°
C) ] - 32 
D)  T(K) = 8/5[t(°
C) ] + 32 
E)  t(°
C)  = 98.6 + T(K) 
A)  T(K) = t(°
C)  + 273.15 
B)  t(°
C)  = T(K) + 273.15 
C)  T(K) = 5/8[t(°
C) ] - 32 
D)  T(K) = 8/5[t(°
C) ] + 32 
E)  t(°
C)  = 98.6 + T(K)

Question 2

A 500.0 mL sample of O2(g) is at 780 mmHg and 30°C. What will be the new volume if, with constant pressure and amount of gas, the temperature is decreased to -15°C?

Accepted Answer

A)  587 mL 
B)  250 mL 
C)  437 mL 
D)  426 mL 
E)  500 mL 
A)  587 mL 
B)  250 mL 
C)  437 mL 
D)  426 mL 
E)  500 mL

Question 3

If gas volume is doubled but the temperature remains constant:

Accepted Answer

A)  the pressure stays the same 
B)  the molecules move faster 
C)  the final pressure is twice the pressure before the volume change. 
D)  the molecules move slower 
E)  the final pressure is 1/2 of the pressure before the volume change. 
A)  the pressure stays the same 
B)  the molecules move faster 
C)  the final pressure is twice the pressure before the volume change. 
D)  the molecules move slower 
E)  the final pressure is 1/2 of the pressure before the volume change.

Question 4

A sample of gas weighs 0.250 g and occupies a volume of 112 cm3 at 0 °C and 1 atm. The molecular weight of this gas is ________.

Accepted Answer

A)  25.0 g/mol 
B)  50.0 g/mol 
C)  2.23 g/mol 
D)  8.0 g/mol 
E)  200 g/mol 
A)  25.0 g/mol 
B)  50.0 g/mol 
C)  2.23 g/mol 
D)  8.0 g/mol 
E)  200 g/mol

Question 5

Convert to the equivalent pressure in atmospheres, 780 torr.

Accepted Answer

A)  0.974 atm 
B)  1.03 atm 
C)  20 atm 
D)  5.93 × 105 atm 
E)  5.85 atm 
A)  0.974 atm 
B)  1.03 atm 
C)  20 atm 
D)  5.93 × 105 atm 
E)  5.85 atm

Question 6

An automobile tire at 32.0 psi at 25.0°C is driven on a trip. At the end of the trip the pressure is 35.0 psi. What is the temperature of the tire in degrees Celsius?

Accepted Answer

A)  27.3 °C 
B)  22.8 °C 
C)  52.9 °C 
D)  57.0 °C 
E)  60.0 °C 
A)  27.3 °C 
B)  22.8 °C 
C)  52.9 °C 
D)  57.0 °C 
E)  60.0 °C

Question 7

Pressure is a force per unit area with the SI unit of 1 pascal

Accepted Answer

A) True 
 B)False

Question 8

Gases tend to behave ideally at:

Accepted Answer

A)  low temperature and low pressure 
B)  low temperature and high pressure 
C)  high temperature and low pressure 
D)  high temperature and high pressure 
E)  gases always behave ideally 
A)  low temperature and low pressure 
B)  low temperature and high pressure 
C)  high temperature and low pressure 
D)  high temperature and high pressure 
E)  gases always behave ideally

Question 9

A sample of helium gas occupies a volume of 38 L at 780 torr and 25°C. What volume would the gas occupy at 0°C and 1 atm?

Accepted Answer

A)  40 L 
B)  38 L 
C)  36 L 
D)  34 L 
E)  25 L 
A)  40 L 
B)  38 L 
C)  36 L 
D)  34 L 
E)  25 L

Question 10

In the reaction: 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g)

Accepted Answer

A)  67.2 L of H2(g) at STP is collected for every mole of Al reacted 
B)  33.6 L of H2(g) is collected for every mole of Al reacted, regardless of the temperature and pressure 
C)  1.24 cm3 H2(g) at STP is collected for every milligram of Al reacted 
D)  6 L HCl(aq) is consumed for every 3 L H2(g) produced 
E)  22.4 L of H2(g) is produced for every mole of Al reacted 
A)  67.2 L of H2(g) at STP is collected for every mole of Al reacted 
B)  33.6 L of H2(g) is collected for every mole of Al reacted, regardless of the temperature and pressure 
C)  1.24 cm3 H2(g) at STP is collected for every milligram of Al reacted 
D)  6 L HCl(aq) is consumed for every 3 L H2(g) produced 
E)  22.4 L of H2(g) is produced for every mole of Al reacted

Question 11

Liquid mercury freezes at a temperature of -39 °C. The freezing point of mercury on the Kelvin scale is ________.

Accepted Answer

A)  234 K 
B)  39 K 
C)  312 K 
D)  273 K 
E)  -39 K 
A)  234 K 
B)  39 K 
C)  312 K 
D)  273 K 
E)  -39 K

Question 12

The addition of 2.0 g He(g) to a vessel of 10.0 L fixed volume already containing O2(g) at 25°C and 740 mmHg will:

Accepted Answer

A)  have no effect on the final gas pressure 
B)  cause the final pressure to exceed 2 atm 
C)  produce a 20% increase in gas pressure 
D)  bring the final pressure to just slightly more than 1 atm 
E)  cause the final pressure to exceed 4 atm 
A)  have no effect on the final gas pressure 
B)  cause the final pressure to exceed 2 atm 
C)  produce a 20% increase in gas pressure 
D)  bring the final pressure to just slightly more than 1 atm 
E)  cause the final pressure to exceed 4 atm

Question 13

Under conditions for which chlorine gas has an effusion rate of 2.4 × 10-6 mol/sec, what would be the effusion rate for bromine gas, in mol/sec?

Accepted Answer

A)  1.1 × 10-6 mol/sec 
B)  1.6 × 10-6 mol/sec 
C)  2.3 × 10-6 mol/sec 
D)  3.6 × 10-6 mol/sec 
E)  5.4 × 10-6 mol/sec 
A)  1.1 × 10-6 mol/sec 
B)  1.6 × 10-6 mol/sec 
C)  2.3 × 10-6 mol/sec 
D)  3.6 × 10-6 mol/sec 
E)  5.4 × 10-6 mol/sec

Question 14

If someone were to light a cigar at one end of a closed room, persons at the other end of the room might soon perceive an odor due to gaseous emissions from the cigar. Such a phenomenon is an example of:

Accepted Answer

A)  monometry 
B)  ideality 
C)  effusion 
D)  diffusion 
E)  barometry 
A)  monometry 
B)  ideality 
C)  effusion 
D)  diffusion 
E)  barometry

Question 15

In a sample of air at STP, the ratio of the root-mean-square velocity of O2 to that of N2, that is urms(O2)/urms(N2), is equal to ________.

Accepted Answer

A)  0.88 
B)  0.94 
C)  1.00 
D)  1.07 
E)  1.14 
A)  0.88 
B)  0.94 
C)  1.00 
D)  1.07 
E)  1.14

Question 16

Chloroform (CHCl3) became popular as an anesthetic after Queen Victoria delivered her eighth child while anesthetized by chloroform in 1853. What is the density in grams per liter of chloroform at 35°Cand 850 torr?

Accepted Answer

A)  4.21 g/L 
B)  0.190 g/L 
C)  2.14 g/L 
D)  4.00 × 103 g/L 
E)  5.28 g/L 
A)  4.21 g/L 
B)  0.190 g/L 
C)  2.14 g/L 
D)  4.00 × 103 g/L 
E)  5.28 g/L

Question 17

The statement, "For a fixed mass of gas at constant temperature, gas volume is inversely proportional to gas pressure" is known as Charles' Law .

Accepted Answer

A) True 
 B)False

Question 18

Of the following gases, the one with the greatest density at STP is:

Accepted Answer

A)  CH4 
B)  NH3 
C)  Ne 
D)  H2 
E)  He 
A)  CH4 
B)  NH3 
C)  Ne 
D)  H2 
E)  He

Question 19

The mutual attraction of gas molecules is an important aspect of van der Waals' equation.

Accepted Answer

A) True 
 B)False

Question 20

When one volume of CO reacts with one volume of Cl2 phosgene is obtained as the only product. What is empirical formula of phosgene?

Accepted Answer

A)  COCl2 
B)  C2O2Cl2 
C)  C2O2Cl 
D)  C3O3Cl2 
E)  COCl4 
A)  COCl2 
B)  C2O2Cl2 
C)  C2O2Cl 
D)  C3O3Cl2 
E)  COCl4

Exam 6: Gases

The relationship between the "absolute temperature" on the Kelvin scale and the Celsius temperature is given by:

A 500.0 mL sample of O2(g) is at 780 mmHg and 30°C. What will be the new volume if, with constant pressure and amount of gas, the temperature is decreased to -15°C?

If gas volume is doubled but the temperature remains constant:

A sample of gas weighs 0.250 g and occupies a volume of 112 cm3 at 0 °C and 1 atm. The molecular weight of this gas is ________.

Convert to the equivalent pressure in atmospheres, 780 torr.

An automobile tire at 32.0 psi at 25.0°C is driven on a trip. At the end of the trip the pressure is 35.0 psi. What is the temperature of the tire in degrees Celsius?

Pressure is a force per unit area with the SI unit of 1 pascal

Gases tend to behave ideally at:

A sample of helium gas occupies a volume of 38 L at 780 torr and 25°C. What volume would the gas occupy at 0°C and 1 atm?

In the reaction: 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g)

Liquid mercury freezes at a temperature of -39 °C. The freezing point of mercury on the Kelvin scale is ________.

The addition of 2.0 g He(g) to a vessel of 10.0 L fixed volume already containing O2(g) at 25°C and 740 mmHg will:

Under conditions for which chlorine gas has an effusion rate of 2.4 × 10-6 mol/sec, what would be the effusion rate for bromine gas, in mol/sec?

If someone were to light a cigar at one end of a closed room, persons at the other end of the room might soon perceive an odor due to gaseous emissions from the cigar. Such a phenomenon is an example of:

In a sample of air at STP, the ratio of the root-mean-square velocity of O2 to that of N2, that is urms(O2)/urms(N2), is equal to ________.

Chloroform (CHCl3) became popular as an anesthetic after Queen Victoria delivered her eighth child while anesthetized by chloroform in 1853. What is the density in grams per liter of chloroform at 35°Cand 850 torr?

The statement, "For a fixed mass of gas at constant temperature, gas volume is inversely proportional to gas pressure" is known as Charles' Law .

Of the following gases, the one with the greatest density at STP is:

The mutual attraction of gas molecules is an important aspect of van der Waals' equation.

When one volume of CO reacts with one volume of Cl2 phosgene is obtained as the only product. What is empirical formula of phosgene?

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

A 500.0 mL sample of O₂(g) is at 780 mmHg and 30°C. What will be the new volume if, with constant pressure and amount of gas, the temperature is decreased to -15°C?

In the reaction: 2 Al(s) + 6 HCl(aq) → 2 AlCl₃(aq) + 3 H₂(g)

The addition of 2.0 g He(g) to a vessel of 10.0 L fixed volume already containing O₂(g) at 25°C and 740 mmHg will:

Under conditions for which chlorine gas has an effusion rate of 2.4 × 10^-6 mol/sec, what would be the effusion rate for bromine gas, in mol/sec?

In a sample of air at STP, the ratio of the root-mean-square velocity of O₂ to that of N₂, that is urms(O₂)/urms(N₂), is equal to ________.

Chloroform (CHCl₃) became popular as an anesthetic after Queen Victoria delivered her eighth child while anesthetized by chloroform in 1853. What is the density in grams per liter of chloroform at 35°Cand 850 torr?

When one volume of CO reacts with one volume of Cl₂ phosgene is obtained as the only product. What is empirical formula of phosgene?