CHEM134 Final Exam Practice Questions
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1. Which statement best describes the fundamental purpose of chemistry as
a scientific discipline?
A. The study of only living organisms and their biological processes
B. The study of matter, its properties, composition, and transformations
C. The study of planets, stars, and galaxies
D. The study of mathematical relationships without physical applications
Correct Answer: B
Rationale: Chemistry focuses on understanding matter, including its
structure, properties, behavior, and the changes it undergoes through
chemical reactions.
2. Which of the following is considered a physical property of a
substance?
A. Flammability
B. Reactivity with acids
C. Melting point
D. Ability to oxidize
Correct Answer: C
,Rationale: A physical property can be observed without changing the
chemical identity of a substance, and melting point is a measurable
physical characteristic.
3. The smallest unit of an element that retains the chemical properties of
that element is called a:
A. Molecule
B. Atom
C. Compound
D. Ion
Correct Answer: B
Rationale: An atom is the basic unit of an element that maintains the
element’s unique chemical properties.
4. Which subatomic particle has a negative electrical charge?
A. Proton
B. Neutron
C. Electron
D. Nucleus
Correct Answer: C
Rationale: Electrons are negatively charged particles that move around the
nucleus of an atom.
5. The atomic number of an element represents the number of:
A. Neutrons
B. Electrons and neutrons combined
C. Protons
D. Nucleons
Correct Answer: C
,Rationale: The atomic number is defined by the number of protons in the
nucleus and uniquely identifies an element.
6. Which scientist is credited with proposing the modern atomic theory?
A. Dmitri Mendeleev
B. John Dalton
C. Ernest Rutherford
D. Niels Bohr
Correct Answer: B
Rationale: John Dalton developed the first modern atomic theory,
describing atoms as fundamental units of matter.
7. What determines the identity of an element?
A. Number of electrons
B. Number of neutrons
C. Number of protons
D. Atomic mass
Correct Answer: C
Rationale: The number of protons, known as the atomic number, defines
the element’s identity.
8. Isotopes of an element differ in their number of:
A. Protons
B. Electrons
C. Neutrons
D. Atomic numbers
Correct Answer: C
Rationale: Isotopes have the same number of protons but different
numbers of neutrons, resulting in different masses.
, 9. The periodic table is arranged according to increasing:
A. Atomic mass only
B. Number of neutrons
C. Atomic number
D. Chemical reactivity
Correct Answer: C
Rationale: Elements on the periodic table are arranged by increasing
atomic number, which corresponds to increasing proton count.
10. Elements located in the same group of the periodic table
generally have:
A. Identical atomic masses
B. Similar chemical properties
C. The same number of neutrons
D. The same physical state
Correct Answer: B
Rationale: Elements in the same group have similar valence electron
configurations, leading to similar chemical behavior.
11. Which type of bond involves the transfer of electrons from one
atom to another?
A. Covalent bond
B. Metallic bond
C. Ionic bond
D. Hydrogen bond
Correct Answer: C
Rationale: Ionic bonds form when electrons are transferred, creating
oppositely charged ions that attract each other.
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which statement best describes the fundamental purpose of chemistry as
a scientific discipline?
A. The study of only living organisms and their biological processes
B. The study of matter, its properties, composition, and transformations
C. The study of planets, stars, and galaxies
D. The study of mathematical relationships without physical applications
Correct Answer: B
Rationale: Chemistry focuses on understanding matter, including its
structure, properties, behavior, and the changes it undergoes through
chemical reactions.
2. Which of the following is considered a physical property of a
substance?
A. Flammability
B. Reactivity with acids
C. Melting point
D. Ability to oxidize
Correct Answer: C
,Rationale: A physical property can be observed without changing the
chemical identity of a substance, and melting point is a measurable
physical characteristic.
3. The smallest unit of an element that retains the chemical properties of
that element is called a:
A. Molecule
B. Atom
C. Compound
D. Ion
Correct Answer: B
Rationale: An atom is the basic unit of an element that maintains the
element’s unique chemical properties.
4. Which subatomic particle has a negative electrical charge?
A. Proton
B. Neutron
C. Electron
D. Nucleus
Correct Answer: C
Rationale: Electrons are negatively charged particles that move around the
nucleus of an atom.
5. The atomic number of an element represents the number of:
A. Neutrons
B. Electrons and neutrons combined
C. Protons
D. Nucleons
Correct Answer: C
,Rationale: The atomic number is defined by the number of protons in the
nucleus and uniquely identifies an element.
6. Which scientist is credited with proposing the modern atomic theory?
A. Dmitri Mendeleev
B. John Dalton
C. Ernest Rutherford
D. Niels Bohr
Correct Answer: B
Rationale: John Dalton developed the first modern atomic theory,
describing atoms as fundamental units of matter.
7. What determines the identity of an element?
A. Number of electrons
B. Number of neutrons
C. Number of protons
D. Atomic mass
Correct Answer: C
Rationale: The number of protons, known as the atomic number, defines
the element’s identity.
8. Isotopes of an element differ in their number of:
A. Protons
B. Electrons
C. Neutrons
D. Atomic numbers
Correct Answer: C
Rationale: Isotopes have the same number of protons but different
numbers of neutrons, resulting in different masses.
, 9. The periodic table is arranged according to increasing:
A. Atomic mass only
B. Number of neutrons
C. Atomic number
D. Chemical reactivity
Correct Answer: C
Rationale: Elements on the periodic table are arranged by increasing
atomic number, which corresponds to increasing proton count.
10. Elements located in the same group of the periodic table
generally have:
A. Identical atomic masses
B. Similar chemical properties
C. The same number of neutrons
D. The same physical state
Correct Answer: B
Rationale: Elements in the same group have similar valence electron
configurations, leading to similar chemical behavior.
11. Which type of bond involves the transfer of electrons from one
atom to another?
A. Covalent bond
B. Metallic bond
C. Ionic bond
D. Hydrogen bond
Correct Answer: C
Rationale: Ionic bonds form when electrons are transferred, creating
oppositely charged ions that attract each other.
