Question : 11.The partial pressure of helium in a gaseous mixture of : 1309604

 

 

11.The partial pressure of helium in a gaseous mixture of helium and nitrogen trifluoride is

a.the pressure that the helium would exert in the absence of the nitrogen trifluoride

b.the percentage of the total pressure of the mixture that is contributed by helium

c.equal to the total pressure divided by helium’s molar mass

d.equal to the total pressure divided by the number of helium atoms present

 

 

 

12.In which of the following pairs of physical changes are both changes exothermic?

a.sublimation, evaporationc.freezing, condensation

b.freezing, meltingd.melting, sublimation

 

 

 

13.Which of the following statements concerning evaporation is incorrect?

a.Molecules with energies considerably above average are those that escape from the liquid.

b.Increasing the surface area of the liquid decreases the rate of evaporation.

c.Increasing the temperature of the liquid increases the rate of evaporation.

d.Evaporation causes the liquid temperature to decrease.

 

 

 

14.Which of the following is not a factor in determining the magnitude of the vapor pressure of a liquid?

a.the temperature of the liquid

b.the strength of the attractive forces between molecules of the liquid

c.the size of the container for the liquid

d.the type of forces between molecules within the liquid

 

 

 

15.The boiling point of a liquid is

a.the temperature at which the rate of evaporation and sublimation are equal

b.always 200?C or greater

c.the temperature at which the pressure over the liquid equals the vapor pressure of the liquid

d.the temperature at which liquid-vapor equilibrium is reached

 

 

 

16.A liquid is placed in a closed container. Equilibrium is reached when

a.all of the liquid evaporates

b.when the rate of condensation equals the rate of evaporation

c.when the rate of condensation exceeds the rate of evaporation

d.when molecules cease to pass from the liquid state to the vapor state

 

 

 

17.Liquids will boil at lower temperatures at higher elevations because:

a.The intermolecular attractions are weaker.

b.Atmospheric pressure increases.

c.It is harder to transfer heat to the liquid.

d.The vapor pressure at which boiling occurs is lower.

 

 

 

18.Which of the following statements about intermolecular forces is incorrect?

a.They must be overcome in order for molecules to escape from the liquid state into the vapor state.

b.They are much weaker than intramolecular forces.

c.They are electrostatic in origin.

d.They occur within molecules rather than between molecules.

 

 

 

19.Which of the following statements is correct?

a.Dipole-dipole interactions occur only between nonpolar molecules.

b.A hydrogen bond is an extremely weak dipole-dipole interaction.

c.London forces are “instantaneous” dipole-dipole interactions.

d.Hydrogen bonding occurs anytime a hydrogen-containing molecule is present in a liquid.

 

 

 

20.In which of the following liquids would London forces be the predominant intermolecular force?

a.HCNc.H2S

b.N2d.IF

 

 

 

 

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