Question : 31.If some of the vapor allowed to escape from a : 1309606

 

 

31.If some of the vapor is allowed to escape from a sample where liquid and vapor are in equilibrium, the immediate result is

a.an increase in intermolecular force strength

b.a decrease in condensation rate

c.a decrease in evaporation rate

d.more than one correct response

e.no correct response

 

 

 

32.When the vapor pressure of a liquid equals atmospheric pressure, the temperature of the liquid equals

a.100? C if the liquid is at sea level

b.the boiling point of the liquid

c.the normal boiling point of the liquid

d.more than one correct response

e.no correct response

 

 

 

33.A volatile liquid would

a.have weak attractive forces between molecules

b.evaporate “slowly” at room temperature

c.have a low vapor pressure at room temperature

d.more than one correct response

e.no correct response

 

 

 

34.Intermolecular forces differ from intramolecular forces in that:

a.They occur only in liquids.

b.They are much stronger.

c.They occur only when hydrogen atoms are present.

d.More than one correct response.

e.No correct response.

 

 

 

35.In which of the following pairs of molecules would the first listed member of the pair have a higher boiling point than the second listed member of the pair?

a.HF and HBr

b.F2 and Cl2

c.O2 and NO

d.more than one correct response

e.no correct response

 

 

 

36.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) For molecules of similar molecular mass, nonpolar molecules have higher vapor pressures than polar molecules.

(2) Temperature values must be expressed on the Kelvin scale when using all gas laws except the ideal gas law.

(3) The average kinetic energy of a system of molecules decreases as temperature increases.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

37.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Sublimation and deposition are “opposite” changes of state.

(2) A pressure of one atmosphere is greater in magnitude than a pressure of 720 torr.

(3) The boiling point of a liquid can be increased by heating the liquid to a higher temperature.

 

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

38.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Associated with Charles’s law is the concept that if the temperature of a gas increases the volume of the gas also increases.

(2) Liquids show little change in volume with changes in temperature.

(3) Dipole-dipole interactions are examples of intramolecular forces and hydrogen bonds are examples of intermolecular forces.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

39.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Macroscopic properties of the liquid state include a definite shape and a definite volume.

(2) A condition of physical equilibrium is associated with the measurement of vapor pressure.

(3) Boyle’s law involves a direct proportionality relationship between pressure and volume.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

40.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Both dipole-dipole interactions and hydrogen bonds are stronger than most single covalent bonds.

(2) The value of the ideal gas constant is the same for all gases under ordinary conditions of P, V, and T.

(3) Both condensation and freezing are endothermic changes of state.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.