CHE 102 Study Guide - Quiz Guide: Boiling Point, Trigonal Pyramidal Molecular Geometry, London Dispersion Force
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Chem 102--Exam #2
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. When water is measured in a plastic graduated cylinder, a reverse meniscus is observed because
a. the hydrogen bonds between water molecules are greater than the attractions between the
water molecules and the walls of the container.
b. the viscosity of the water is greater than the viscosity of the plastic.
c. surface tension of the water prevents it from "beading up" inside the container.
d. the molecules of water are forced closer together because of London forces.
e. the attractive forces between the water molecules and the walls of the container are greater
than the attractive forces between the water molecules.
____ 2. Volatility is the
a. temperature at which the equilibrium vapor pressure of a liquid is exactly equal to the
b. odor of a substance.
c. temperature at which a gas can be converted into a liquid at atmospheric pressure.
d. tendency of molecules of a gas to move closer together when the pressure is increased.
e. tendency of a liquid to vaporize.
____ 3. The Clausius-Clapeyron equation is useful for calculating
a. the enthalpy of vaporization.
b. the heat capacity.
c. the relative humidity.
d. the unit cell identity.
e. the band gap.
____ 4. Which group includes only exothermic processes?
a. freezing, vaporization, deposition
b. freezing, condensation, deposition
c. melting, condensation, deposition
d. melting, evaporation, sublimation
e. melting, condensation, sublimation
____ 5. A positive slope for a region of a heating curve indicates that _________ in that region.
a. no energy is being absorbed by the system
b. energy is being given off by the system, but it cannot be measured
c. energy is being absorbed by the system and is being used for a phase change
d. additional data is needed to explain this observation
e. energy is being absorbed by the system and is being used to increase the temperature
____ 6. The temperature at point b is the
a. critical point.
b. triple point.
c. absolute freezing point.
d. normal freezing point.
e. normal boiling point.
____ 7. The simplest explanation for the unusual properties of water in comparison to other compounds of similar
structure and molar mass is
a. hydrogen bonding.
b. covalent bonding.
c. trigonal pyramidal structure.
d. London forces.
e. its purity.
____ 8. Which choice is an example of an amorphous solid?
b. ionic solid
____ 9. Which choice is an example of a network solid?
____ 10. Because graphite contains carbon atoms that are covalently bonded to three other carbon atoms in the
same layer, it is classified as a(an) _________ solid.
a. planar network
c. three-dimensional network