Quiz 9

A  planar network

B  amorphous

C  metallic

D  three-dimensional network

A  III only

B  I only

C  II and III

D  II only

A  I only

B  III only

C  II only

D  I, II, and III

A  There is no general relationship between these two quantities and the values depend on the substance involved.

B  The vaporization enthalpy represents the heat released when a gas becomes a liquid, and the condensation enthalpy represents the heat required for a liquid to become a gas.

C  The condensation enthalpy is equal in magnitude but opposite in sign when compared to the vaporization enthalpy.

D  The vaporization enthalpy is always less than the condensation enthalpy.

A  freezing, vaporization, deposition

B  melting, condensation, deposition

C  freezing, condensation, deposition

D  melting, evaporation, sublimation

A  can help determine the vapor pressure of a substance at different temperatures.

B  predicts a linear relationship between lnP and 1/T

C  graphing the equation produces a slope equal to −ΔHvap/R

D  used only for calculating the enthalpy of vaporization of a substance

A  is an equilibrium partial pressure due to gas molecules.

B  increases when the evaporation rate of a liquid increases.

C  increases when liquid molecules have more kinetic energy to escape the liquid phase.

D  decreases when liquid molecules have weaker intermolecular forces.

A  the molecules of water are forced closer together because of London forces.

B  the hydrogen bonds between water molecules are greater than the attractions between the water molecules and the walls of the container.

C  the attractive forces between the water molecules and the walls of the container are greater than the attractive forces between the water molecules.

D  the viscosity of the water is greater than the viscosity of the plastic.

A  the molecules are forced closer together because of London forces.

B  surface tension of the water causes it to “bead up” inside the container.

C  the viscosity of the water is greater than the viscosity of the glass.

D  the attractive forces between the water molecules and the walls of the container are greater than the attractive forces between the water molecules

A  capillary action, because the molecules are less attracted to each other than to the walls of the container

B  viscous, because the molecules can become entangled as they move past each other

C  fluid, because the molecules retain some mobility

D  incompressible, because the molecules are relatively far apart