General Chemistry Questions:
1) According to the phase diagram below, which of the following statements is false?
a) At the temperature and pressure of point 1, Z can exist as a three-phase system at equilibrium. b) If liquid Z at the pressure and temperature of point 2 is heated, it will undergo evaporation. c) At the temperature of point 5, liquid Z is denser than solid Z. *d) If solid Z at the pressure and temperature of point 3 is heated, it will undergo fusion (melting). d) At the temperature of point 4, the substance Z cannot be liquefied at any pressure. 2) A liquid in a closed container is at equilibrium with its vapor. If the container is briefly opened and some of the vapor is allowed to escape, what is the immediate result? a) vaporization rate increases b) condensation rate increases *c) condensation rate decreases c) vaporization rate decreases d) none of these 3) A liquid will exhibit a concave meniscus and undergo capillary action whenever a) it has a high vapor pressure b) it has a low vapor pressure *c) adhesive interactions are strong compared to cohesive interactions. c) adhesive interactions are weak compared to cohesive interactions. d) the surface tension is greater than the viscosity 4) The enthalpy of sublimation is equal to, but opposite in sign from, the enthalpy of: a) formation b) vaporization c) sublimation [1]
d) fusion *e) deposition 5) The heat of deposition, ΔHdeposition, is equal to a) -ΔHvaporization b) ΔHfusion + ΔHvaporization c) –ΔHfusion *d) ΔHcondensation + ΔHsolidification d) ΔHfusion + ΔHsolidification 6) Which compound is most likely to be soluble in both water and benzene? a) toluene (C7H8) *b) propyl alcohol (C3H7OH) b) hexane (C6H14) c) naphthalene (C10H8) d) calcium chloride (CaCl2)
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a) At the temperature and pressure of point 1, Z can exist as a three-phase system at equilibrium. b) If liquid Z at the pressure and temperature of point 2 is heated, it will undergo evaporation. c) At the temperature of point 5, liquid Z is denser than solid Z. *d) If solid Z at the pressure and temperature of point 3 is heated, it will undergo fusion (melting). d) At the temperature of point 4, the substance Z cannot be liquefied at any pressure. 2) A liquid in a closed container is at equilibrium with its vapor. If the container is briefly opened and some of the vapor is allowed to escape, what is the immediate result? a) vaporization rate increases b) condensation rate increases *c) condensation rate decreases c) vaporization rate decreases d) none of these 3) A liquid will exhibit a concave meniscus and undergo capillary action whenever a) it has a high vapor pressure b) it has a low vapor pressure *c) adhesive interactions are strong compared to cohesive interactions. c) adhesive interactions are weak compared to cohesive interactions. d) the surface tension is greater than the viscosity 4) The enthalpy of sublimation is equal to, but opposite in sign from, the enthalpy of: a) formation b) vaporization c) sublimation [1]
d) fusion *e) deposition 5) The heat of deposition, ΔHdeposition, is equal to a) -ΔHvaporization b) ΔHfusion + ΔHvaporization c) –ΔHfusion *d) ΔHcondensation + ΔHsolidification d) ΔHfusion + ΔHsolidification 6) Which compound is most likely to be soluble in both water and benzene? a) toluene (C7H8) *b) propyl alcohol (C3H7OH) b) hexane (C6H14) c) naphthalene (C10H8) d) calcium chloride (CaCl2)
[2]
