,CHEM 103 Module 6 | Exam study Questions and Answers + Rationales |
2026/27 Updates | 100% correct
1. Define or describe: **Amorphous solid**.
A) A solid in which particles are arranged in an orderly, repeating, geometric pattern
B) A solid in which particles are arranged in a random fashion
C) A solid that exists only at very low temperatures
D) A solid that cannot be melted
Correct Answer: A solid in which particles are arranged in a random fashion
Rationale: An amorphous solid is characterized by a random arrangement of its constituent
particles, lacking the long-range order found in crystalline solids. This random structure
distinguishes it from crystalline solids, which have repeating patterns. Glass is a common
example of an amorphous solid.
2. Define or describe: **Colligative property**.
A) A physical property of a solution that depends on the identity of the solute
B) A physical property of a solvent that is dependent on the concentration of the solute but
not on its identity
C) A chemical property that depends on the nature of the solvent
D) A property that is independent of the concentration of solute
Correct Answer: A physical property of a solvent that is dependent on the concentration of
the solute but not on its identity
Rationale: Colligative properties are physical properties of solvents that depend on the
concentration of the solute present and the identity of the solvent but not on the identity of the
,solute. Vapor pressure lowering, boiling point elevation, and freezing point depression are
classic examples.
3. Define or describe: **Colloid**.
A) A homogeneous mixture with particles large enough to be seen
B) A heterogeneous mixture that appears to be homogeneous but is composed of particles
too small to be seen with the naked eye
C) A solution with particles smaller than 1 nm
D) A pure substance with a uniform composition
Correct Answer: A heterogeneous mixture that appears to be homogeneous but is composed
of particles too small to be seen with the naked eye
Rationale: Colloids are heterogeneous mixtures which appear to be homogeneous one-phase
mixtures but are actually composed of particles too small to be seen with the naked eye. Milk is
a common example of a colloid (an emulsion).
4. Define or describe: **Condensation**.
A) The conversion of a liquid to a gas
B) The conversion of a solid directly to a gas
C) The conversion of a gas to a liquid
D) The conversion of a liquid to a solid
Correct Answer: The conversion of a gas to a liquid
Rationale: Condensation is the process of a gas being converted to a liquid. This phase change
is exothermic, meaning it releases heat.
, 5. Define or describe: **Critical point**.
A) The temperature and pressure at which all three phases coexist
B) The temperature above which a substance cannot exist in the liquid phase
C) The pressure at which a liquid boils at room temperature
D) The temperature at which a solid melts
Correct Answer: The temperature above which a substance cannot exist in the liquid phase
Rationale: The critical point is the temperature above which a substance cannot exist in the
liquid phase. The corresponding pressure is called the critical pressure.
6. Define or describe: **Critical pressure**.
A) The pressure exerted by vapor molecules above a liquid
B) The lowest pressure required for the substance to exist as a liquid at the critical point
C) The pressure at the triple point
D) The pressure at which a gas condenses at room temperature
Correct Answer: The lowest pressure required for the substance to exist as a liquid at the
critical point
Rationale: Critical pressure is the lowest pressure required for the substance to exist as a
liquid at the critical point. Above the critical temperature, liquid cannot exist, regardless of
pressure.
7. Define or describe: **Crystalline solid**.
A) A solid in which particles are arranged in a random fashion
2026/27 Updates | 100% correct
1. Define or describe: **Amorphous solid**.
A) A solid in which particles are arranged in an orderly, repeating, geometric pattern
B) A solid in which particles are arranged in a random fashion
C) A solid that exists only at very low temperatures
D) A solid that cannot be melted
Correct Answer: A solid in which particles are arranged in a random fashion
Rationale: An amorphous solid is characterized by a random arrangement of its constituent
particles, lacking the long-range order found in crystalline solids. This random structure
distinguishes it from crystalline solids, which have repeating patterns. Glass is a common
example of an amorphous solid.
2. Define or describe: **Colligative property**.
A) A physical property of a solution that depends on the identity of the solute
B) A physical property of a solvent that is dependent on the concentration of the solute but
not on its identity
C) A chemical property that depends on the nature of the solvent
D) A property that is independent of the concentration of solute
Correct Answer: A physical property of a solvent that is dependent on the concentration of
the solute but not on its identity
Rationale: Colligative properties are physical properties of solvents that depend on the
concentration of the solute present and the identity of the solvent but not on the identity of the
,solute. Vapor pressure lowering, boiling point elevation, and freezing point depression are
classic examples.
3. Define or describe: **Colloid**.
A) A homogeneous mixture with particles large enough to be seen
B) A heterogeneous mixture that appears to be homogeneous but is composed of particles
too small to be seen with the naked eye
C) A solution with particles smaller than 1 nm
D) A pure substance with a uniform composition
Correct Answer: A heterogeneous mixture that appears to be homogeneous but is composed
of particles too small to be seen with the naked eye
Rationale: Colloids are heterogeneous mixtures which appear to be homogeneous one-phase
mixtures but are actually composed of particles too small to be seen with the naked eye. Milk is
a common example of a colloid (an emulsion).
4. Define or describe: **Condensation**.
A) The conversion of a liquid to a gas
B) The conversion of a solid directly to a gas
C) The conversion of a gas to a liquid
D) The conversion of a liquid to a solid
Correct Answer: The conversion of a gas to a liquid
Rationale: Condensation is the process of a gas being converted to a liquid. This phase change
is exothermic, meaning it releases heat.
, 5. Define or describe: **Critical point**.
A) The temperature and pressure at which all three phases coexist
B) The temperature above which a substance cannot exist in the liquid phase
C) The pressure at which a liquid boils at room temperature
D) The temperature at which a solid melts
Correct Answer: The temperature above which a substance cannot exist in the liquid phase
Rationale: The critical point is the temperature above which a substance cannot exist in the
liquid phase. The corresponding pressure is called the critical pressure.
6. Define or describe: **Critical pressure**.
A) The pressure exerted by vapor molecules above a liquid
B) The lowest pressure required for the substance to exist as a liquid at the critical point
C) The pressure at the triple point
D) The pressure at which a gas condenses at room temperature
Correct Answer: The lowest pressure required for the substance to exist as a liquid at the
critical point
Rationale: Critical pressure is the lowest pressure required for the substance to exist as a
liquid at the critical point. Above the critical temperature, liquid cannot exist, regardless of
pressure.
7. Define or describe: **Crystalline solid**.
A) A solid in which particles are arranged in a random fashion
