, CHEM 110 - EXAM 1
Chemistry and Biochemistry in Our World | Chamberlain University
100-Question Original Practice Examination | 2026/2027 Edition
1. A technician observes that a sample contains one kind of atom only. How should the sample be
classified?
A) Compound
B) Heterogeneous mixture
C) Element
D) Homogeneous mixture
Correct Answer: Element
Rationale: An element consists of only one type of atom, regardless of the amount present. Compounds contain
chemically combined different elements. Mixtures retain multiple substances without a fixed chemical composition.
2. Filtered saltwater is transparent and uniform throughout. Which description fits it best?
A) Homogeneous mixture
B) Element
C) Pure compound
D) Heterogeneous mixture
Correct Answer: Homogeneous mixture
Rationale: Dissolved salt is distributed uniformly in the water, giving a single visible phase. The components are not
chemically bonded into one pure compound and can be separated physically.
3. A powdered sample contains visibly different white and black grains. Which classification is most
appropriate?
A) Homogeneous solution
B) Heterogeneous mixture
C) Pure element
D) Molecular compound
Correct Answer: Heterogeneous mixture
Rationale: The two visibly distinct components show a nonuniform composition. A heterogeneous mixture contains
different regions or phases, whereas a homogeneous mixture appears uniform on the scale of observation.
4. Which observation is most direct evidence that a chemical change occurred?
A) A liquid freezes
B) A crystal is crushed
C) A solid produces a new gas during reaction with acid
D) A metal wire is bent
CHEM 110 | Independent Practice Assessment 1
, Correct Answer: A solid produces a new gas during reaction with acid
Rationale: Gas evolution from a reaction can indicate formation of a new chemical substance. Freezing, bending, and
crushing change physical state or shape without necessarily changing chemical identity.
5. A liquid has a boiling point of 78 degrees Celsius at a given pressure. The boiling point is what kind of
property?
A) Chemical reaction
B) Chemical property
C) Physical property
D) Nuclear property
Correct Answer: Physical property
Rationale: Boiling point describes a substance without changing its chemical identity. Chemical properties concern the
ability to undergo composition-changing reactions, such as oxidation or combustion.
6. A 2-g and a 200-g portion of the same pure liquid have the same density at the same temperature.
Why?
A) Density depends on sample mass
B) Density is a chemical property
C) Density is always 1 g/mL
D) Density is an intensive property
Correct Answer: Density is an intensive property
Rationale: Density is the mass-to-volume ratio and does not depend on how much of a uniform substance is sampled.
Mass and volume separately are extensive properties, but their ratio is intensive.
7. A lab team measures both mass and volume of a copper block. Which measured property is extensive?
A) Density
B) Mass
C) Melting point
D) Temperature
Correct Answer: Mass
Rationale: Mass scales with the amount of matter and is therefore extensive. Density, melting point, and temperature
do not scale simply with the quantity of the same material.
8. Which technique best separates two miscible liquids with substantially different boiling points?
A) Sieving
B) Distillation
C) Magnetism
D) Filtration
CHEM 110 | Independent Practice Assessment 2
Chemistry and Biochemistry in Our World | Chamberlain University
100-Question Original Practice Examination | 2026/2027 Edition
1. A technician observes that a sample contains one kind of atom only. How should the sample be
classified?
A) Compound
B) Heterogeneous mixture
C) Element
D) Homogeneous mixture
Correct Answer: Element
Rationale: An element consists of only one type of atom, regardless of the amount present. Compounds contain
chemically combined different elements. Mixtures retain multiple substances without a fixed chemical composition.
2. Filtered saltwater is transparent and uniform throughout. Which description fits it best?
A) Homogeneous mixture
B) Element
C) Pure compound
D) Heterogeneous mixture
Correct Answer: Homogeneous mixture
Rationale: Dissolved salt is distributed uniformly in the water, giving a single visible phase. The components are not
chemically bonded into one pure compound and can be separated physically.
3. A powdered sample contains visibly different white and black grains. Which classification is most
appropriate?
A) Homogeneous solution
B) Heterogeneous mixture
C) Pure element
D) Molecular compound
Correct Answer: Heterogeneous mixture
Rationale: The two visibly distinct components show a nonuniform composition. A heterogeneous mixture contains
different regions or phases, whereas a homogeneous mixture appears uniform on the scale of observation.
4. Which observation is most direct evidence that a chemical change occurred?
A) A liquid freezes
B) A crystal is crushed
C) A solid produces a new gas during reaction with acid
D) A metal wire is bent
CHEM 110 | Independent Practice Assessment 1
, Correct Answer: A solid produces a new gas during reaction with acid
Rationale: Gas evolution from a reaction can indicate formation of a new chemical substance. Freezing, bending, and
crushing change physical state or shape without necessarily changing chemical identity.
5. A liquid has a boiling point of 78 degrees Celsius at a given pressure. The boiling point is what kind of
property?
A) Chemical reaction
B) Chemical property
C) Physical property
D) Nuclear property
Correct Answer: Physical property
Rationale: Boiling point describes a substance without changing its chemical identity. Chemical properties concern the
ability to undergo composition-changing reactions, such as oxidation or combustion.
6. A 2-g and a 200-g portion of the same pure liquid have the same density at the same temperature.
Why?
A) Density depends on sample mass
B) Density is a chemical property
C) Density is always 1 g/mL
D) Density is an intensive property
Correct Answer: Density is an intensive property
Rationale: Density is the mass-to-volume ratio and does not depend on how much of a uniform substance is sampled.
Mass and volume separately are extensive properties, but their ratio is intensive.
7. A lab team measures both mass and volume of a copper block. Which measured property is extensive?
A) Density
B) Mass
C) Melting point
D) Temperature
Correct Answer: Mass
Rationale: Mass scales with the amount of matter and is therefore extensive. Density, melting point, and temperature
do not scale simply with the quantity of the same material.
8. Which technique best separates two miscible liquids with substantially different boiling points?
A) Sieving
B) Distillation
C) Magnetism
D) Filtration
CHEM 110 | Independent Practice Assessment 2
