Chapter 8,9 & 10

Which of the following is not a property of gases?

• Gases are compressible.

• Gases expand to fill their containers.

• The density of a gas is similar to that of a liquid

• Gas particles move about rapidly.

Which of the following statements regarding gas pressure is correct?

• Gas pressure is commonly measured in units of pounds per square foot.

• The pressure of air on the outside of a metal can with a low internal pressure is sufficient to crush the can.

• If the volume of a container filled with a gas increases at constant temperature, the pressure will also increase

• If the temperature of a gas sample increases while the gas is held at a constant volume, the pressure will decrease.

Calculate the amount of heat energy required to evaporate 55.0 g of water at 100.0C. (molar heat of vaporization of liquid water = 4.07 x 104 J/mol)

• A. 1.24 x 102 kJ

• B. 2.24 x 103 kJ

• C. 4.03 x 104 kJ

• D. 1.24 x 108 kJ

Which of the following statements regarding intermolecular forces is incorrect?

• A. An intermolecular force is an attractive force that operates between molecules.

• B. Bonding forces are much stronger than intermolecular forces.

• C. London dispersion forces occur in all atoms and molecules

• D. London dispersion forces are the result of permanent dipoles in atoms or molecules.

The physical properties of a substance influenced by the strength of intermolecular forces include all of the following except:

• A. density.

• B. boiling point.

• C. surface tension..

• D. mass.

Which of the following substances is most likely to be a gas at room temperature and atmospheric pressure?

• A. Ni

• B. Hg

• C. CO2

• D. C7H16

Rank the following substances in order of increasing boiling point: F2, Ne, He, Cl2 A. F2 < Ne < He < Cl2 B. F2 < He < Ne < Cl2 C. F2 < Cl2 < He < Ne D. He < Ne < F2 < Cl2

• A. F2 < Ne < He < Cl2

• B. F2 < He < Ne < Cl2

• C. F2 < Cl2 < He < Ne

• D. He < Ne < F2 < Cl2

Which of the following has the highest boiling point? A. H2 B. H2O C. H2S D. H2Se

• A. H2

• B. H2O

• C. H2S

• D. H2Se

If a 1.50 L gas sample is held at a constant temperature, and its pressure is changed from 2.30 atm to 3.60 atm, what will the final volume be?

• A. 1.50

• B. 3.45 L

• C. 0.958 L

• D. 8.28 L

Which of the following statements regarding intermolecular forces is incorrect?

• A. Hydrogen bonding is the strongest of the intermolecular forces.

• B. London dispersion forces increase with increasing molecular size.

• C. Dipole-dipole forces are present in all atoms and molecules.

• D. In order for a pure substance to participate in hydrogen bonding, it must have hydrogen bonded to F, O, or N.