Chemical Principles, 9th Edition
Steven S. Zumdahl, Donald J. DeCoste
TEST BANK
✓ 2,495 Questions with Answers
✓ 2,057 Multiple Choice Questions (MCQs)
✓ 243 Subjective & Short-Answer Questions
✓ 190 Multiple Response Questions
✓ True/False Questions Included
✓ Chapters 2–21 Covered
✓ Easy, Moderate & Difficult Questions
✓ Topic & Keyword References
✓ Conceptual + Calculation-Based Chemistry
Questions
✓ 1,350+ Pages of Assessment Material
✓ Updated 2026/2027 Content
,TABLE OF CONTENTS
Chapter 1 — Chemists and Chemistry — No Test Bank (Test Bank begins with Chapter 2)
Chapter 2 — Atoms, Molecules, and Ions
Chapter 3 — Stoichiometry
Chapter 4 — Types of Chemical Reactions and Solution Stoichiometry
Chapter 5 — Gases
Chapter 6 — Chemical Equilibrium
Chapter 7 — Acids and Bases
Chapter 8 — Applications of Aqueous Equilibria
Chapter 9 — Energy, Enthalpy, and Thermochemistry
Chapter 10 — Spontaneity, Entropy, and Free Energy
Chapter 11 — Electrochemistry
Chapter 12 — Quantum Mechanics and Atomic Theory
Chapter 13 — Bonding: General Concepts
Chapter 14 — Covalent Bonding: Orbitals
Chapter 15 — Chemical Kinetics
Chapter 16 — Liquids and Solids
Chapter 17 — Properties of Solutions
Chapter 18 — The Representative Elements
Chapter 19 — Transition Metals and Coordination Chemistry
Chapter 20 — The Nucleus: A Chemist’s View
Chapter 21 — Organic and Biochemical Molecules
,Chapter 2 Atoms, Molecules, and Ions
1. According to the law of definite proportions,
a. the ratio of the masses of the elements in a compound is always the same.
b. it is not possible for the same two elements to form more than one compound.
c. if the same two elements form two different compounds, they do so in the same ratio.
d. the total mass after a chemical change is the same as before the change.
ANSWER: a
POINTS: 1
DIFFICULTY: Easy
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: 2.2
KEYWORDS: compound | general chemistry | general concepts | matter
DATE CREATED: 11/24/2025 5:35 AM
DATE MODIFIED: 11/24/2025 5:39 AM
2. Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?
a. CaO and CaCl2
b. NO and NO2
c. H2S and HBr
d. SiH4 and SiO2
e. NF3 and NCl3
ANSWER: b
POINTS: 1
DIFFICULTY: Easy
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: 2.2
KEYWORDS: compound | general chemistry | general concepts | matter
DATE CREATED: 11/24/2025 5:39 AM
DATE MODIFIED: 12/3/2025 7:58 AM
Page 1
, Chapter 2 Atoms, Molecules, and Ions
3. Which of the following did Dalton discuss in his atomic theory?
a. isotopes
b. atoms
c. protons
d. neutrons
e. electrons
ANSWER: b
POINTS: 1
REFERENCES: Easy
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: 2.3
KEYWORDS: atomic theory of matter | Dalton's atomic theory | early atomic theory | general chemistry
DATE CREATED: 11/24/2025 5:40 AM
DATE MODIFIED: 12/3/2025 7:59 AM
4. When 2.0 L of oxygen gas (O2) reacts with 1.0 L of nitrogen gas (N2), 2.0 L of gaseous product is formed. All
volumes of gases are measured at the same temperature and pressure. What is the formula of the product?
a. NO
b. NO4
c. N2O3
d. N2O
e. NO2
ANSWER: e
POINTS: 1
DIFFICULTY: Easy
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: 2.4
KEYWORDS: chemical formula | chemical substance | early atomic theory | general chemistry | molecular
substance
DATE CREATED: 11/24/2025 5:40 AM
DATE MODIFIED: 11/24/2025 5:53 AM
Page 2
Steven S. Zumdahl, Donald J. DeCoste
TEST BANK
✓ 2,495 Questions with Answers
✓ 2,057 Multiple Choice Questions (MCQs)
✓ 243 Subjective & Short-Answer Questions
✓ 190 Multiple Response Questions
✓ True/False Questions Included
✓ Chapters 2–21 Covered
✓ Easy, Moderate & Difficult Questions
✓ Topic & Keyword References
✓ Conceptual + Calculation-Based Chemistry
Questions
✓ 1,350+ Pages of Assessment Material
✓ Updated 2026/2027 Content
,TABLE OF CONTENTS
Chapter 1 — Chemists and Chemistry — No Test Bank (Test Bank begins with Chapter 2)
Chapter 2 — Atoms, Molecules, and Ions
Chapter 3 — Stoichiometry
Chapter 4 — Types of Chemical Reactions and Solution Stoichiometry
Chapter 5 — Gases
Chapter 6 — Chemical Equilibrium
Chapter 7 — Acids and Bases
Chapter 8 — Applications of Aqueous Equilibria
Chapter 9 — Energy, Enthalpy, and Thermochemistry
Chapter 10 — Spontaneity, Entropy, and Free Energy
Chapter 11 — Electrochemistry
Chapter 12 — Quantum Mechanics and Atomic Theory
Chapter 13 — Bonding: General Concepts
Chapter 14 — Covalent Bonding: Orbitals
Chapter 15 — Chemical Kinetics
Chapter 16 — Liquids and Solids
Chapter 17 — Properties of Solutions
Chapter 18 — The Representative Elements
Chapter 19 — Transition Metals and Coordination Chemistry
Chapter 20 — The Nucleus: A Chemist’s View
Chapter 21 — Organic and Biochemical Molecules
,Chapter 2 Atoms, Molecules, and Ions
1. According to the law of definite proportions,
a. the ratio of the masses of the elements in a compound is always the same.
b. it is not possible for the same two elements to form more than one compound.
c. if the same two elements form two different compounds, they do so in the same ratio.
d. the total mass after a chemical change is the same as before the change.
ANSWER: a
POINTS: 1
DIFFICULTY: Easy
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: 2.2
KEYWORDS: compound | general chemistry | general concepts | matter
DATE CREATED: 11/24/2025 5:35 AM
DATE MODIFIED: 11/24/2025 5:39 AM
2. Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?
a. CaO and CaCl2
b. NO and NO2
c. H2S and HBr
d. SiH4 and SiO2
e. NF3 and NCl3
ANSWER: b
POINTS: 1
DIFFICULTY: Easy
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: 2.2
KEYWORDS: compound | general chemistry | general concepts | matter
DATE CREATED: 11/24/2025 5:39 AM
DATE MODIFIED: 12/3/2025 7:58 AM
Page 1
, Chapter 2 Atoms, Molecules, and Ions
3. Which of the following did Dalton discuss in his atomic theory?
a. isotopes
b. atoms
c. protons
d. neutrons
e. electrons
ANSWER: b
POINTS: 1
REFERENCES: Easy
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: 2.3
KEYWORDS: atomic theory of matter | Dalton's atomic theory | early atomic theory | general chemistry
DATE CREATED: 11/24/2025 5:40 AM
DATE MODIFIED: 12/3/2025 7:59 AM
4. When 2.0 L of oxygen gas (O2) reacts with 1.0 L of nitrogen gas (N2), 2.0 L of gaseous product is formed. All
volumes of gases are measured at the same temperature and pressure. What is the formula of the product?
a. NO
b. NO4
c. N2O3
d. N2O
e. NO2
ANSWER: e
POINTS: 1
DIFFICULTY: Easy
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: 2.4
KEYWORDS: chemical formula | chemical substance | early atomic theory | general chemistry | molecular
substance
DATE CREATED: 11/24/2025 5:40 AM
DATE MODIFIED: 11/24/2025 5:53 AM
Page 2
