Chapter 11

The substance with the largest heat of vaporization A)I2 B)Br2 C)F2

A I2 has highest molar mass

Which of the following exhibits dipole-dipole IMF A) BCl3 B) Cl2 C) XeF4 D)CO2 E) AsH3

AsH3 Has a lone pair of electrons

which of the following substances is expected to have the lowest melting point? a)NaI b)BrI c)CsI d)RbI e)LiI

BrI

Of the following substances, __________ has the highest boiling point. A) H2O B) CO2 C) CH4 D) Kr E) NH3

H2O

which one of the following substances should exhibit hydrogen bonding in the liquid state? a)H2S b)CH4 c)H2 d)NH3 e)PH3

NH3

which of the following phase changes is endothermic? a)deposition b)freezing c)sublimation d)condensation

sublimation

Dispersion forces

two nonpolar molecules all molecules have this

Dipole-dipole

two polar molecules

which of the following substances is expected to have the highest molar heat of vaporization? a)He b)H2O c)C6H6 d)Ar E)NH3

H2O

which one of the following substances will have both dispersion forces and dipole-dipole forces? a)CO2 b)HCl c)H2 d)BCl3 e)Br2

HCl

which one of the following substances is expected to have the highest boiling point? a)HF b)HI c)HCl d)HBr

HF

Arrange the following substances in order of increasing boiling point: CH3OH, He, CH3Cl, N2 a)He<N2<CHCl<CH3OH b)N2<He<CH3OH<CH3Cl c)CH3OH<He<CH3Cl<N2 d)CH3Cl<He<N2<CH3OH e)He<N2<CH3OH<CH3Cl

He<N2<CH3Cl<CH3OH

which one of the following substances is expected to have the highest boiling point? a)F2 b)Br2 c)I2 d)Cl2

I2

Of the following substances, only __________ has London dispersion forces as its only intermolecular force. A) CH3OH B) NH3 C) H2S D) Kr E) HCl

Kr

Which of the following characteristics indicates the presence of weak intermolecular forces in a liquid? A)high critical temperature B)high boiling point C)a low heat of vaporization D)a low vapor pressure E)none of above

a low heat of vaporization

Which of the following properties indicates the presence of strong intermolecular forces in a liquid? a) a low vapor pressure b) a low heat of vaporization c) a low boiling point d) a low critical temperature e) none of the above

a low vapor pressure

Dipole-induced dipole

a polar molecule and nonpolar molecule (HCl and Cl2)

which of the following would be expected to have the highest vapor pressure at room temperature? a)methanol,bp=65 b)water,bp=100 c)acetone,bp=56 d)ethanol,bp=78

acetone,bp=56

Ion-induced dipole

an ion and a nonpolar (HCl,Cl2)

ion-dipole

an ion and polar molecule (Na+, H2O)

which of the following phase changes is exothermic? a)vaporization b)sublimation c)condensation d)melting

condensation

A phase change from the gas phase directly to the solid phase is called: a)melting b)sublimation c)condensation d)deposition e)freezing

deposition

crystalline solids A)exist only at low temperatures B)have highly ordered structures C)are usually soft

have highly ordered structures

hydrogen bonding

molecules which have H on N,O, or F atoms

which property of water allows a razor blade to float on it without sinking? a)surface tension b)specific heat c)triple point d)density e)viscosity

surface tension

the vapor pressure increases as ________________increases A)molecular weight B) hydrogen bonding C) surface tension D)temperature

temperature

Based on the phase diagram shown below, how will the melting point of the substance change if the pressure is increased above 1 atm? a)the melting point will remain the same b)the melting point will increase c)the substance will not melt at pressures of 1 atm and above; instead, the solid sublimes to form the gas phase d)the melting point will decrease

the melting point will increase

the vapor pressure of a liquid in a closed container depends upon a) surface area of a liquid b)the temperature c)the amount of liquid d)the volume of container e)none of above

the temperature

a liquid boils when its a)temperature is equal to 273K b)temperature is greater than room temperature c)vapor pressure is equal to, or greater than, the external pressure pushing on it d)vapor pressure is exactly 1 atmosphere

vapor pressure is equal to, or greater than, the external pressure pushing on it

which of the following would be expected to have the lowest vapor pressure at room temperature? a)methanol,bp=65 b)acetone,bp=56 c)ethanol,bp=78 d)water,bp=100

water,bp=100