Question 1

Melting is the change from the ________ state to the ________ state.

Accepted Answer

The answer of Melting is the change from the ________...

Question 2

The temperature at which a liquid becomes a gas is called the

Accepted Answer

A)  melting point. 
B)  boiling point. 
C)  sublimation point. 
D)  decomposition point. 
A)  melting point. 
B)  boiling point. 
C)  sublimation point. 
D)  decomposition point.

Question 3

When an ionic compound dissolves in water,

Accepted Answer

A)  the negative ends of water molecules surround the negative ions. 
B)  the positive ends of water molecules surround the positive ions. 
C)  the negative ends of water molecules surround the positive ions. 
D)  the negative ends of water molecules surround both the negative and the positive ions. 
A)  the negative ends of water molecules surround the negative ions. 
B)  the positive ends of water molecules surround the positive ions. 
C)  the negative ends of water molecules surround the positive ions. 
D)  the negative ends of water molecules surround both the negative and the positive ions.

Question 4

A gas is enclosed in a 15.0 L tank at 600 mm Hg pressure. Which of the following is a reasonable value for the pressure when the gas is pumped into a 3.00 L vessel?

Accepted Answer

A)  1000 mm Hg 
B)  120 mm Hg 
C)  3000 mm Hg 
D)  1200 mm Hg 
A)  1000 mm Hg 
B)  120 mm Hg 
C)  3000 mm Hg 
D)  1200 mm Hg

Question 5

Which of the following is NOT a postulate of the kinetic-molecular theory?

Accepted Answer

A)  Molecules of a gas move rapidly and in straight lines. 
B)  The molecules in a gas are tiny compared to the distance between them. 
C)  The molecules of a gas are strongly attracted to each other. 
D)  If two molecules collide with each other, the total energy of the molecules before the collision is the same as their total energy after the collision. 
A)  Molecules of a gas move rapidly and in straight lines. 
B)  The molecules in a gas are tiny compared to the distance between them. 
C)  The molecules of a gas are strongly attracted to each other. 
D)  If two molecules collide with each other, the total energy of the molecules before the collision is the same as their total energy after the collision.

Question 6

Supercritical water and scCO2 are "generally regarded as safe" by the U.S. Food and Drug Administration and are often used in the food industry.

Accepted Answer

A) True 
 B)False

Question 7

Supercritical fluids require the use of special equipment to control the temperatures and high pressures needed for their use.

Accepted Answer

A) True 
 B)False

Question 8

A gas is enclosed in a 10.0 L tank at 1200 mm Hg pressure. Which of the following is a reasonable value for the pressure when the gas is pumped into a 5.00 L vessel?

Accepted Answer

A)  2400 mm Hg 
B)  600 mm Hg 
C)  24 mm Hg 
D)  42 mm Hg 
A)  2400 mm Hg 
B)  600 mm Hg 
C)  24 mm Hg 
D)  42 mm Hg

Question 9

Most organic solvents are toxic, but supercritical fluids are generally regarded as safe.

Accepted Answer

A) True 
 B)False

Question 10

The kinetic-molecular theory of gases assumes which of the following?

Accepted Answer

A)  There are weak but significant interactions between gas molecules. 
B)  The total amount of energy will change when gas molecules collide. 
C)  The average kinetic energy of gas molecules will increase when you lower the temperature of the gas. 
D)  Gas molecules move constantly and in straight lines. 
A)  There are weak but significant interactions between gas molecules. 
B)  The total amount of energy will change when gas molecules collide. 
C)  The average kinetic energy of gas molecules will increase when you lower the temperature of the gas. 
D)  Gas molecules move constantly and in straight lines.

Question 11

Which of the following is the weakest?

Accepted Answer

A)  dipole forces 
B)  dispersion forces 
C)  hydrogen bonds 
D)  ionic bonds 
A)  dipole forces 
B)  dispersion forces 
C)  hydrogen bonds 
D)  ionic bonds

Question 12

The process by which a gas is converted to a liquid is called

Accepted Answer

A)  condensation. 
B)  melting. 
C)  vaporization. 
D)  sublimation. 
A)  condensation. 
B)  melting. 
C)  vaporization. 
D)  sublimation.

Question 13

At a given temperature and pressure, the volume of a gas is directly proportional to the amount of gas present. This is a statement of

Accepted Answer

A)  Avogadro's Law. 
B)  Boyle's Law. 
C)  Charles's Law. 
D)  the Ideal Gas Law. 
A)  Avogadro's Law. 
B)  Boyle's Law. 
C)  Charles's Law. 
D)  the Ideal Gas Law.

Question 14

At STP, 22.4 liters of krypton gas, Kr, will have a mass of

Accepted Answer

A)  20.9 g. 
B)  41.9 g. 
C)  83.8 g. 
D)  167 g. 
A)  20.9 g. 
B)  41.9 g. 
C)  83.8 g. 
D)  167 g.

Question 15

Which state of matter is characterized by having molecules close together, but moving randomly?

Accepted Answer

A)  gas 
B)  liquid 
C)  solid 
D)  all of these 
A)  gas 
B)  liquid 
C)  solid 
D)  all of these

Question 16

Ethane has the formula CH3CH3. What is the predominant intermolecular force between ethane molecules?

Accepted Answer

A)  dipole forces 
B)  dispersion forces 
C)  hydrogen bonds 
D)  ionic bonds 
A)  dipole forces 
B)  dispersion forces 
C)  hydrogen bonds 
D)  ionic bonds

Question 17

The phrase "like dissolves like" means that a polar substance will dissolve readily in a polar solvent.

Accepted Answer

A) True 
 B)False

Question 18

At STP, 1 mole of oxygen gas, O2, will have a mass of

Accepted Answer

A)  16.0 g. 
B)  22.4 g. 
C)  28.0 g. 
D)  32.0 g. 
A)  16.0 g. 
B)  22.4 g. 
C)  28.0 g. 
D)  32.0 g.

Question 19

A covalent bond is weaker than a hydrogen bond.

Accepted Answer

A) True 
 B)False

Question 20

If the temperature of a gas is lowered, the gas molecules will strike the walls of its container more frequently. (Assume that the container has a definite shape and volume.)

Accepted Answer

A) True 
 B)False

Exam 6: Gases, Liquids, Solids, and Intermolecular Forces

Melting is the change from the ________ state to the ________ state.

The temperature at which a liquid becomes a gas is called the

When an ionic compound dissolves in water,

A gas is enclosed in a 15.0 L tank at 600 mm Hg pressure. Which of the following is a reasonable value for the pressure when the gas is pumped into a 3.00 L vessel?

Which of the following is NOT a postulate of the kinetic-molecular theory?

Supercritical water and scCO2 are "generally regarded as safe" by the U.S. Food and Drug Administration and are often used in the food industry.

Supercritical fluids require the use of special equipment to control the temperatures and high pressures needed for their use.

A gas is enclosed in a 10.0 L tank at 1200 mm Hg pressure. Which of the following is a reasonable value for the pressure when the gas is pumped into a 5.00 L vessel?

Most organic solvents are toxic, but supercritical fluids are generally regarded as safe.

The kinetic-molecular theory of gases assumes which of the following?

Which of the following is the weakest?

The process by which a gas is converted to a liquid is called

At a given temperature and pressure, the volume of a gas is directly proportional to the amount of gas present. This is a statement of

At STP, 22.4 liters of krypton gas, Kr, will have a mass of

Which state of matter is characterized by having molecules close together, but moving randomly?

Ethane has the formula CH3CH3. What is the predominant intermolecular force between ethane molecules?

The phrase "like dissolves like" means that a polar substance will dissolve readily in a polar solvent.

At STP, 1 mole of oxygen gas, O2, will have a mass of

A covalent bond is weaker than a hydrogen bond.

If the temperature of a gas is lowered, the gas molecules will strike the walls of its container more frequently. (Assume that the container has a definite shape and volume.)

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Melting is the change from the state to the state.

Supercritical water and scCO₂ are "generally regarded as safe" by the U.S. Food and Drug Administration and are often used in the food industry.

Ethane has the formula CH₃CH₃. What is the predominant intermolecular force between ethane molecules?

At STP, 1 mole of oxygen gas, O₂, will have a mass of