Question 1

If a 7.00 gram sample of molecular nitrogen at 10. °C occupies 2.50 L, what is the pressure of the sample?

Accepted Answer

A)  1.28 atm 
B)  2.32 atm 
C)  2.56 atm 
D)  4.65 atm 
A)  1.28 atm 
B)  2.32 atm 
C)  2.56 atm 
D)  4.65 atm

Question 2

Which of the following is a mathematical statement of the ideal gas law?

Accepted Answer

A)  PVRT = n 
B)  PV/RT = n 
C)  VRT/P = n 
D)  n = RT/PV 
A)  PVRT = n 
B)  PV/RT = n 
C)  VRT/P = n 
D)  n = RT/PV

Question 3

Which of the following types of solids does not typically have a well defined melting point?

Accepted Answer

A)  amorphous 
B)  ionic 
C)  molecular 
D)  network covalent 
A)  amorphous 
B)  ionic 
C)  molecular 
D)  network covalent

Question 4

Suppose a balloon is filled so that its volume is 2.00 L when the pressure is 750 torr and the temperature is 24°C. What volume will it occupy if it rises to an elevation where the pressure is 375 torr and the temperature is 12°C?

Accepted Answer

A)  0.261 L 
B)  0.500 L 
C)  2.00 L 
D)  3.84 L 
A)  0.261 L 
B)  0.500 L 
C)  2.00 L 
D)  3.84 L

Question 5

Which of the following pieces of data can we obtain from a heating curve?

Accepted Answer

A)  boiling point of a liquid 
B)  melting point of a solid 
C)  specific heat of a solid 
D)  all of the above 
A)  boiling point of a liquid 
B)  melting point of a solid 
C)  specific heat of a solid 
D)  all of the above

Question 6

Consider the following diagram. The liquid in the apparatus is mercury.   If the pressure of the gas sample on arm B is 1.0 atm, what will be the difference in the heights of the mercury column in arms A and B? This difference is represented in the diagram by the variable h?

Accepted Answer

A)  1.0 mm Hg 
B)  760 mm Hg 
C)  760 atm 
D)  It will be equal to the current atmospheric pressure. 
A)  1.0 mm Hg 
B)  760 mm Hg 
C)  760 atm 
D)  It will be equal to the current atmospheric pressure.

Question 7

Which of the following phase changes does not involve a solid?

Accepted Answer

A)  evaporation 
B)  melting 
C)  sublimation 
D)  None, they all involve a solid. 
A)  evaporation 
B)  melting 
C)  sublimation 
D)  None, they all involve a solid.

Question 8

Which of the following will occur if the temperature of a gas is decreased from 60°C to 30°C at constant pressure?

Accepted Answer

A)  The volume will double. 
B)  The volume will be halved. 
C)  The volume will decrease slightly. 
D)  The volume will increase slightly. 
A)  The volume will double. 
B)  The volume will be halved. 
C)  The volume will decrease slightly. 
D)  The volume will increase slightly.

Question 9

Which of the following best describes the relationship of molecules in a liquid with those in a gas at the same temperature?

Accepted Answer

A)  Molecules in the liquid are much closer together than those in the gas. 
B)  Molecules in the liquid have less kinetic energy than those in the gas. 
C)  both a and b 
D)  neither a nor b 
A)  Molecules in the liquid are much closer together than those in the gas. 
B)  Molecules in the liquid have less kinetic energy than those in the gas. 
C)  both a and b 
D)  neither a nor b

Question 10

Which of the following affects the vapor pressure of a liquid?

Accepted Answer

A)  the mass of the sample 
B)  the shape the sample 
C)  the temperature of the sample 
D)  the volume of the sample 
A)  the mass of the sample 
B)  the shape the sample 
C)  the temperature of the sample 
D)  the volume of the sample

Question 11

Which of the following will occur if the temperature of a gas is increased from 20°C to 40°C at constant pressure?

Accepted Answer

A)  The volume will double. 
B)  The volume will be halved. 
C)  The volume will decrease slightly. 
D)  The volume will increase slightly. 
A)  The volume will double. 
B)  The volume will be halved. 
C)  The volume will decrease slightly. 
D)  The volume will increase slightly.

Question 12

The specific heat of water is 1.0 cal/g·°C. The heat of vaporization of water is 540 cal/g. Which of the following is true?

Accepted Answer

A)  It takes less energy to evaporate one gram of water than it does to heat one gram of water from 0°C to 100°C. 
B)  It takes more energy to evaporate one gram of water than it does to heat one gram of water from 0°C to 100°C. 
C)  It takes the same amount of energy to evaporate one gram of water as it does to heat one gram of water from 0°C to 100°C. 
D)  There is insufficient information to answer the question. 
A)  It takes less energy to evaporate one gram of water than it does to heat one gram of water from 0°C to 100°C. 
B)  It takes more energy to evaporate one gram of water than it does to heat one gram of water from 0°C to 100°C. 
C)  It takes the same amount of energy to evaporate one gram of water as it does to heat one gram of water from 0°C to 100°C. 
D)  There is insufficient information to answer the question.

Question 13

Suppose a balloon is filled so that its volume is 2.00 L when the pressure is 1.10 atm and the temperature is 300 K. What volume will it occupy if it rises to an elevation where the pressure is 418 mm Hg and the temperature is 200 K?

Accepted Answer

A)  3.30 L 
B)  2.67 L 
C)  0.375 L 
D)  0.303 L 
A)  3.30 L 
B)  2.67 L 
C)  0.375 L 
D)  0.303 L

Question 14

The specific heat of iron is 0.110 cal /g·°C. The heat of fusion of iron is 63.7 cal/g. The melting point of iron is 1530°C. How much heat must be added to 10.0 g of iron at 25°C to completely melt it?

Accepted Answer

A)  0.637 kcal 
B)  0.803 kcal 
C)  1.676 kcal 
D)  2.29 kcal 
A)  0.637 kcal 
B)  0.803 kcal 
C)  1.676 kcal 
D)  2.29 kcal

Question 15

At high altitudes atmospheric pressure is lower than at sea level. Which of the following is true?

Accepted Answer

A)  Boiling water is cooler in Denver than in New York. 
B)  Boiling water is hotter in Denver than in New York. 
C)  Water boils at the same temperature in Denver and New York. 
D)  We cannot predict the relationship between the boiling points in the two cities. 
A)  Boiling water is cooler in Denver than in New York. 
B)  Boiling water is hotter in Denver than in New York. 
C)  Water boils at the same temperature in Denver and New York. 
D)  We cannot predict the relationship between the boiling points in the two cities.

Question 16

An unknown amount of He gas occupies 30.5 L at 2.00 atm pressure and 300. K. What is the weight of the gas in the container?

Accepted Answer

A)  2.48 g 
B)  4.95 g 
C)  9.91 g 
D)  19.8 g 
A)  2.48 g 
B)  4.95 g 
C)  9.91 g 
D)  19.8 g

Question 17

Consider the following heating curve for the generic substance Z.  
-What is the boiling point of substance Z?

Accepted Answer

A)  20 °C 
B)  30 °C 
C)  80 °C 
D)  90 °C 
A)  20 °C 
B)  30 °C 
C)  80 °C 
D)  90 °C

Question 18

Which of the following is a unit of pressure?

Accepted Answer

A)  mm of Hg 
B)  pascals 
C)  torr 
D)  They are all units of pressure. 
A)  mm of Hg 
B)  pascals 
C)  torr 
D)  They are all units of pressure.

Question 19

Which of the following exerts the greatest pressure?

Accepted Answer

A)  a 40 gram object on a surface of 2.0 cm2 
B)  a 60 gram object on a surface of 3.0 cm2 
C)  a 80 gram object on a surface of 4.0 cm2 
D)  None, they all exert the same pressure. 
A)  a 40 gram object on a surface of 2.0 cm2 
B)  a 60 gram object on a surface of 3.0 cm2 
C)  a 80 gram object on a surface of 4.0 cm2 
D)  None, they all exert the same pressure.

Question 20

Hydrogen bonding plays an important role in which of the following?

Accepted Answer

A)  the boiling point of water 
B)  the expansion of water upon freezing 
C)  both a and b 
D)  neither a nor b 
A)  the boiling point of water 
B)  the expansion of water upon freezing 
C)  both a and b 
D)  neither a nor b

Exam 5: Gases, Liquids, and Solids

If a 7.00 gram sample of molecular nitrogen at 10. °C occupies 2.50 L, what is the pressure of the sample?

Which of the following is a mathematical statement of the ideal gas law?

Which of the following types of solids does not typically have a well defined melting point?

Suppose a balloon is filled so that its volume is 2.00 L when the pressure is 750 torr and the temperature is 24°C. What volume will it occupy if it rises to an elevation where the pressure is 375 torr and the temperature is 12°C?

Which of the following pieces of data can we obtain from a heating curve?

Consider the following diagram. The liquid in the apparatus is mercury. If the pressure of the gas sample on arm B is 1.0 atm, what will be the difference in the heights of the mercury column in arms A and B? This difference is represented in the diagram by the variable h?

Which of the following phase changes does not involve a solid?

Which of the following will occur if the temperature of a gas is decreased from 60°C to 30°C at constant pressure?

Which of the following best describes the relationship of molecules in a liquid with those in a gas at the same temperature?

Which of the following affects the vapor pressure of a liquid?

Which of the following will occur if the temperature of a gas is increased from 20°C to 40°C at constant pressure?

The specific heat of water is 1.0 cal/g·°C. The heat of vaporization of water is 540 cal/g. Which of the following is true?

Suppose a balloon is filled so that its volume is 2.00 L when the pressure is 1.10 atm and the temperature is 300 K. What volume will it occupy if it rises to an elevation where the pressure is 418 mm Hg and the temperature is 200 K?

The specific heat of iron is 0.110 cal /g·°C. The heat of fusion of iron is 63.7 cal/g. The melting point of iron is 1530°C. How much heat must be added to 10.0 g of iron at 25°C to completely melt it?

At high altitudes atmospheric pressure is lower than at sea level. Which of the following is true?

An unknown amount of He gas occupies 30.5 L at 2.00 atm pressure and 300. K. What is the weight of the gas in the container?

Consider the following heating curve for the generic substance Z. -What is the boiling point of substance Z?

Which of the following is a unit of pressure?

Which of the following exerts the greatest pressure?

Hydrogen bonding plays an important role in which of the following?

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