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CHEM 101 General Chemistry I
Fall Semester Practice Questions &
Solutions
286 Questions with Correct Answers & Detailed Rationales — 2026 Edition
Format: Q&A + Rationales + Why-Wrong + References Graded: A+ / Guaranteed Pass
Updated: 2026 (Latest Edition) Questions: 286
What This Exam Covers
This comprehensive CHEM 101 General Chemistry I practice question bank is aligned with the
standard General Chemistry I curriculum for fall semester. It covers all essential topics for the
course, including:
Matter and Measurement: SI units, significant figures, dimensional analysis, density, and
unit conversions.
Atomic Structure and Periodicity: Subatomic particles, isotopes, atomic mass, electron
configuration, periodic trends, and quantum numbers.
Chemical Bonding and Molecular Geometry: Ionic and covalent bonding, Lewis
structures, VSEPR theory, polarity, and hybridization.
Stoichiometry: Mole concept, molar mass, percent composition, empirical and molecular
formulas, limiting reactant, theoretical yield, and percent yield.
Chemical Reactions: Balancing equations, precipitation, acid-base, redox reactions, and
net ionic equations.
Gases: Gas laws (Boyle's, Charles's, Avogadro's, Ideal Gas Law), Dalton's law, Graham's law,
and kinetic molecular theory.
Thermochemistry: Energy, heat, work, enthalpy, Hess's law, calorimetry, and standard
enthalpies of formation.
Quantum Chemistry: Photoelectric effect, atomic spectra, wave-particle duality, and
quantum numbers.
Chemical Equilibrium: Equilibrium constant, Le Chatelier's principle, and ICE tables.
, Acids and Bases: Arrhenius, Brønsted-Lowry, pH, pOH, titrations, and buffers.
Solutions and Colligative Properties: Molarity, molality, dilution, vapor pressure
lowering, boiling point elevation, freezing point depression, and osmosis.
ABSTRACT
This CHEM 101 General Chemistry I Fall Semester Practice Question bank is a comprehensive
resource that consolidates the most frequently tested concepts from introductory chemistry
courses. It contains 286 practice questions that closely mirror the actual semester exam in
style, difficulty, and content distribution. Each question is accompanied by a detailed rationale
that explains the chemical reasoning behind the correct answer, plus a targeted "Why Wrong"
section that addresses only the incorrect options — helping you understand exactly why each
distractor is not the best choice. Additionally, each question includes a reference citing the
specific textbook chapter or chemical concept for further study. This comprehensive approach
reinforces chemical principles, mathematical problem-solving, and test-taking strategies,
ensuring you are fully prepared for your fall semester examination.
Why Download This Exam?
Guaranteed Pass: Master the content tested on the CHEM 101 Fall Semester Exam with
286 carefully crafted questions that cover every major topic.
Learn from Mistakes: Each incorrect option is explained in detail so you understand why
it is wrong, not just why the correct answer is right.
Exam Readiness: Build confidence by practicing with questions that mirror the real exam
format and difficulty level.
Time-Saving: All the essential content is consolidated into one document — no need to
search through multiple resources.
Instant Download: Access the material immediately and start studying right away.
References Included: Each question includes a reference citation for deeper exploration
of the topic.
You will pass CHEM 101 on your first attempt with this comprehensive review!
Matter & Measurement Atomic Structure Chemical Bonding Stoichiometry
Chemical Reactions Gases Thermochemistry Quantum Chemistry
, Equilibrium Acids & Bases Solutions
CHEM101 GENERALCHEMISTRY FALLSEMESTER VERIFIEDQANDA GRADEDA+ RATIONALES
WHYWRONG GUARANTEEDPASS
1.
What is the correct number of significant figures in the measurement 0.004060?
A. 4
B. 5
C. 6
D. 7
Correct Answer: A
Rationale: The measurement 0.004060 has four significant figures: the digits 4, 0, 6, and 0.
Leading zeros (before the 4) are not significant, but trailing zeros after a decimal point and after a
non-zero digit are significant.
Why the other options are wrong:
B. 5 — 5 would be incorrect because there are only four significant digits.
C. 6 — 6 would be incorrect because it would count the leading zeros as significant.
D. 7 — 7 would be incorrect because it counts all digits including leading zeros.
Reference: Brown, LeMay, Bursten, Chemistry: The Central Science, 15th ed., Chapter 1.
2.
How many protons, neutrons, and electrons are in an atom of ⁶⁵Cu?
A. 29 protons, 36 neutrons, 29 electrons
B. 29 protons, 65 neutrons, 29 electrons
C. 36 protons, 29 neutrons, 36 electrons
D. 29 protons, 36 neutrons, 36 electrons
Correct Answer: A
Rationale: Copper has an atomic number of 29 (protons). The mass number is 65, so neutrons =
65 - 29 = 36. In a neutral atom, electrons equal protons (29).
, Why the other options are wrong:
B. 29 protons, 65 neutrons, 29 electrons — 65 neutrons is incorrect; the mass number is 65, not
the neutron count.
C. 36 protons, 29 neutrons, 36 electrons — 36 protons is incorrect; the atomic number of copper
is 29.
D. 29 protons, 36 neutrons, 36 electrons — 36 electrons is incorrect; a neutral copper atom has
29 electrons.
Reference: Brown, LeMay, Bursten, Chemistry: The Central Science, 15th ed., Chapter 2.
3.
What is the correct electron configuration for phosphorus?
A. 1s²2s²2p⁶3s²3p³
B. 1s²2s²2p⁶3s²3p⁴
C. 1s²2s²2p⁶3s²3p²
D. 1s²2s²2p⁶3s²3p⁵
Correct Answer: A
Rationale: Phosphorus has 15 electrons. The electron configuration is 1s²2s²2p⁶3s²3p³, with 5
valence electrons in the 3s and 3p orbitals.
Why the other options are wrong:
B. 1s²2s²2p⁶3s²3p⁴ — 3p⁴ would be sulfur (16 electrons), not phosphorus.
C. 1s²2s²2p⁶3s²3p² — 3p² would be silicon (14 electrons), not phosphorus.
D. 1s²2s²2p⁶3s²3p⁵ — 3p⁵ would be chlorine (17 electrons), not phosphorus.
Reference: Brown, LeMay, Bursten, Chemistry: The Central Science, 15th ed., Chapter 6.
4.
What is the molar mass of glucose (C₆H₁₂O₆)?
A. 120 g/mol
B. 180 g/mol
C. 160 g/mol
D. 200 g/mol
CHEM 101 General Chemistry I
Fall Semester Practice Questions &
Solutions
286 Questions with Correct Answers & Detailed Rationales — 2026 Edition
Format: Q&A + Rationales + Why-Wrong + References Graded: A+ / Guaranteed Pass
Updated: 2026 (Latest Edition) Questions: 286
What This Exam Covers
This comprehensive CHEM 101 General Chemistry I practice question bank is aligned with the
standard General Chemistry I curriculum for fall semester. It covers all essential topics for the
course, including:
Matter and Measurement: SI units, significant figures, dimensional analysis, density, and
unit conversions.
Atomic Structure and Periodicity: Subatomic particles, isotopes, atomic mass, electron
configuration, periodic trends, and quantum numbers.
Chemical Bonding and Molecular Geometry: Ionic and covalent bonding, Lewis
structures, VSEPR theory, polarity, and hybridization.
Stoichiometry: Mole concept, molar mass, percent composition, empirical and molecular
formulas, limiting reactant, theoretical yield, and percent yield.
Chemical Reactions: Balancing equations, precipitation, acid-base, redox reactions, and
net ionic equations.
Gases: Gas laws (Boyle's, Charles's, Avogadro's, Ideal Gas Law), Dalton's law, Graham's law,
and kinetic molecular theory.
Thermochemistry: Energy, heat, work, enthalpy, Hess's law, calorimetry, and standard
enthalpies of formation.
Quantum Chemistry: Photoelectric effect, atomic spectra, wave-particle duality, and
quantum numbers.
Chemical Equilibrium: Equilibrium constant, Le Chatelier's principle, and ICE tables.
, Acids and Bases: Arrhenius, Brønsted-Lowry, pH, pOH, titrations, and buffers.
Solutions and Colligative Properties: Molarity, molality, dilution, vapor pressure
lowering, boiling point elevation, freezing point depression, and osmosis.
ABSTRACT
This CHEM 101 General Chemistry I Fall Semester Practice Question bank is a comprehensive
resource that consolidates the most frequently tested concepts from introductory chemistry
courses. It contains 286 practice questions that closely mirror the actual semester exam in
style, difficulty, and content distribution. Each question is accompanied by a detailed rationale
that explains the chemical reasoning behind the correct answer, plus a targeted "Why Wrong"
section that addresses only the incorrect options — helping you understand exactly why each
distractor is not the best choice. Additionally, each question includes a reference citing the
specific textbook chapter or chemical concept for further study. This comprehensive approach
reinforces chemical principles, mathematical problem-solving, and test-taking strategies,
ensuring you are fully prepared for your fall semester examination.
Why Download This Exam?
Guaranteed Pass: Master the content tested on the CHEM 101 Fall Semester Exam with
286 carefully crafted questions that cover every major topic.
Learn from Mistakes: Each incorrect option is explained in detail so you understand why
it is wrong, not just why the correct answer is right.
Exam Readiness: Build confidence by practicing with questions that mirror the real exam
format and difficulty level.
Time-Saving: All the essential content is consolidated into one document — no need to
search through multiple resources.
Instant Download: Access the material immediately and start studying right away.
References Included: Each question includes a reference citation for deeper exploration
of the topic.
You will pass CHEM 101 on your first attempt with this comprehensive review!
Matter & Measurement Atomic Structure Chemical Bonding Stoichiometry
Chemical Reactions Gases Thermochemistry Quantum Chemistry
, Equilibrium Acids & Bases Solutions
CHEM101 GENERALCHEMISTRY FALLSEMESTER VERIFIEDQANDA GRADEDA+ RATIONALES
WHYWRONG GUARANTEEDPASS
1.
What is the correct number of significant figures in the measurement 0.004060?
A. 4
B. 5
C. 6
D. 7
Correct Answer: A
Rationale: The measurement 0.004060 has four significant figures: the digits 4, 0, 6, and 0.
Leading zeros (before the 4) are not significant, but trailing zeros after a decimal point and after a
non-zero digit are significant.
Why the other options are wrong:
B. 5 — 5 would be incorrect because there are only four significant digits.
C. 6 — 6 would be incorrect because it would count the leading zeros as significant.
D. 7 — 7 would be incorrect because it counts all digits including leading zeros.
Reference: Brown, LeMay, Bursten, Chemistry: The Central Science, 15th ed., Chapter 1.
2.
How many protons, neutrons, and electrons are in an atom of ⁶⁵Cu?
A. 29 protons, 36 neutrons, 29 electrons
B. 29 protons, 65 neutrons, 29 electrons
C. 36 protons, 29 neutrons, 36 electrons
D. 29 protons, 36 neutrons, 36 electrons
Correct Answer: A
Rationale: Copper has an atomic number of 29 (protons). The mass number is 65, so neutrons =
65 - 29 = 36. In a neutral atom, electrons equal protons (29).
, Why the other options are wrong:
B. 29 protons, 65 neutrons, 29 electrons — 65 neutrons is incorrect; the mass number is 65, not
the neutron count.
C. 36 protons, 29 neutrons, 36 electrons — 36 protons is incorrect; the atomic number of copper
is 29.
D. 29 protons, 36 neutrons, 36 electrons — 36 electrons is incorrect; a neutral copper atom has
29 electrons.
Reference: Brown, LeMay, Bursten, Chemistry: The Central Science, 15th ed., Chapter 2.
3.
What is the correct electron configuration for phosphorus?
A. 1s²2s²2p⁶3s²3p³
B. 1s²2s²2p⁶3s²3p⁴
C. 1s²2s²2p⁶3s²3p²
D. 1s²2s²2p⁶3s²3p⁵
Correct Answer: A
Rationale: Phosphorus has 15 electrons. The electron configuration is 1s²2s²2p⁶3s²3p³, with 5
valence electrons in the 3s and 3p orbitals.
Why the other options are wrong:
B. 1s²2s²2p⁶3s²3p⁴ — 3p⁴ would be sulfur (16 electrons), not phosphorus.
C. 1s²2s²2p⁶3s²3p² — 3p² would be silicon (14 electrons), not phosphorus.
D. 1s²2s²2p⁶3s²3p⁵ — 3p⁵ would be chlorine (17 electrons), not phosphorus.
Reference: Brown, LeMay, Bursten, Chemistry: The Central Science, 15th ed., Chapter 6.
4.
What is the molar mass of glucose (C₆H₁₂O₆)?
A. 120 g/mol
B. 180 g/mol
C. 160 g/mol
D. 200 g/mol
