Question 1

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 2

Methanol

Accepted Answer

A) can dissolve in water and will not conduct electricity. 
B) can dissolve in water and will conduct electricity. 
C) does not dissolve in water and will not conduct electricity. 
D) does not dissolve in water and will conduct electricity.

Question 3

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.

Question 4

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.

Question 5

The ideal gas law can be used to determine a new volume for a gas when its temperature is changed.

Accepted Answer

A) True 
 B)False

Question 6

A solution is a heterogeneous mixture.

Accepted Answer

A) True 
 B)False

Question 7

All of the following statements about scCO₂ are correct EXCEPT

Accepted Answer

A) It can dissolve substances, just as liquids can. 
B) It flows rapidly, just as gases do. 
C) It causes cancer. 
D) It can make processes occur more rapidly.

Question 8

Which of the following is NOT a property of an ionic compound? Ionic compounds generally

Accepted Answer

A) dissolve in water. 
B) form solutions that conduct electricity well. 
C) have melting points lower than those of molecular compounds. 
D) require more energy to change from the liquid to the gaseous state.

Question 9

According to the kinetic-molecular theory,there is very little attraction between particles of a gas.

Accepted Answer

A) True 
 B)False

Question 10

The temperature at which a solid melts is the melting point of the solid.The melting point is an indication of the intermolecular forces that hold the solid together.Water melts at 0°C.Table sugar (sucrose)melts at 285°C.Gallium,Ga,melts at 30°C.Which one of the following ranks the intermolecular forces in these solids from the strongest to the weakest?

Accepted Answer

A) Ga > water > sucrose 
B) sucrose > Ga > water 
C) water > sucrose > Ga 
D) Ga > sucrose > water

Question 11

The conditions for standard temperature and pressure (STP)are 1 atm pressure and 0°C.

Accepted Answer

A) True 
 B)False

Question 12

Which state of matter is characterized by having molecules far apart and moving randomly?

Accepted Answer

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

Question 13

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 14

Methanol has the formula CH₃OH.What is the predominant intermolecular force between methanol molecules?

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

Assume that you have a sample of a gas.You know the volume,the temperature and the number of moles of the sample.Which of the following laws would you use if you wanted to calculate the pressure of the sample?

Accepted Answer

A) Boyle's Law 
B) Charles's Law 
C) Law of Combining Volumes 
D) Ideal Gas Law

Question 17

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

Question 18

What type of forces exist between bromine molecules in liquid bromine?

Accepted Answer

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

Question 19

Which of the following is the weakest?

Accepted Answer

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

Question 20

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

Accepted Answer

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

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

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.

Methanol

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

When an ionic compound dissolves in water,

The ideal gas law can be used to determine a new volume for a gas when its temperature is changed.

A solution is a heterogeneous mixture.

All of the following statements about scCO₂ are correct EXCEPT

Which of the following is NOT a property of an ionic compound? Ionic compounds generally

According to the kinetic-molecular theory,there is very little attraction between particles of a gas.

The conditions for standard temperature and pressure (STP)are 1 atm pressure and 0°C.

Which state of matter is characterized by having molecules far apart and moving randomly?

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

Methanol has the formula CH₃OH.What is the predominant intermolecular force between methanol molecules?

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

Assume that you have a sample of a gas.You know the volume,the temperature and the number of moles of the sample.Which of the following laws would you use if you wanted to calculate the pressure of the sample?

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?

What type of forces exist between bromine molecules in liquid bromine?

Which of the following is the weakest?

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