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