CHEM 121 MODULE 1 EXAM
COMPREHENSIVE QUESTIONS AND
ANSWERS 2026/2027 UPDATE || 100%
GUARANTEED PASS
1. Which of the following is defined as anything that has mass and takes up space?
A. Energy
B. Force
C. Vacuum
D. Matter
Answer: D
Conceptual Explanation: Matter is the fundamental substance of the universe that has
mass and occupies volume.
2. A substance that cannot be broken down into simpler substances by chemical means is
called a(n):
A. Element
B. Mixture
C. Compound
,D. Isotope
Answer: A
Conceptual Explanation: Elements are the simplest forms of matter that retain unique
chemical properties.
3. Which state of matter has a definite volume but takes the shape of its container?
A. Solid
B. Liquid
C. Gas
D. Plasma
Answer: B
Conceptual Explanation: Liquids have fixed volumes but lack a fixed shape, conforming to
the container.
4. Which of the following is an example of a homogeneous mixture?
A. Saltwater
B. Oil and water
C. Granite rock
D. Chicken noodle soup
Answer: A
, Conceptual Explanation: Homogeneous mixtures, or solutions, have a uniform
composition throughout.
5. The process of a solid changing directly into a gas is known as:
A. Sublimation
B. Evaporation
C. Deposition
D. Condensation
Answer: A
Conceptual Explanation: Sublimation is the phase transition from solid directly to gas
without passing through the liquid phase.
6. Which of the following is a chemical property of copper?
A. It reacts with moist air to form a green patina
B. It conducts electricity
C. It has a reddish-brown color
D. It has a density of 8.96 g/cm3
Answer: A
Conceptual Explanation: Chemical properties describe how a substance changes into a
new substance; reacting with air is a chemical change.
COMPREHENSIVE QUESTIONS AND
ANSWERS 2026/2027 UPDATE || 100%
GUARANTEED PASS
1. Which of the following is defined as anything that has mass and takes up space?
A. Energy
B. Force
C. Vacuum
D. Matter
Answer: D
Conceptual Explanation: Matter is the fundamental substance of the universe that has
mass and occupies volume.
2. A substance that cannot be broken down into simpler substances by chemical means is
called a(n):
A. Element
B. Mixture
C. Compound
,D. Isotope
Answer: A
Conceptual Explanation: Elements are the simplest forms of matter that retain unique
chemical properties.
3. Which state of matter has a definite volume but takes the shape of its container?
A. Solid
B. Liquid
C. Gas
D. Plasma
Answer: B
Conceptual Explanation: Liquids have fixed volumes but lack a fixed shape, conforming to
the container.
4. Which of the following is an example of a homogeneous mixture?
A. Saltwater
B. Oil and water
C. Granite rock
D. Chicken noodle soup
Answer: A
, Conceptual Explanation: Homogeneous mixtures, or solutions, have a uniform
composition throughout.
5. The process of a solid changing directly into a gas is known as:
A. Sublimation
B. Evaporation
C. Deposition
D. Condensation
Answer: A
Conceptual Explanation: Sublimation is the phase transition from solid directly to gas
without passing through the liquid phase.
6. Which of the following is a chemical property of copper?
A. It reacts with moist air to form a green patina
B. It conducts electricity
C. It has a reddish-brown color
D. It has a density of 8.96 g/cm3
Answer: A
Conceptual Explanation: Chemical properties describe how a substance changes into a
new substance; reacting with air is a chemical change.
