GENERAL CHEMISTRY COMPREHENSIVE EXAMINATION: TEST BANK FOR CHEMISTRY
(15TH EDITION) BY JASON OVERBY — CHAPTERS 1-25
SECTION I: MEASUREMENT, MATTER, AND ATOMIC STRUCTURE (CHAPTERS 1-2)
1. Which of the following represents a heterogeneous mixture?
(A) NaCl dissolved in water
(B) Air
(C) Oil and water
(D) Brass
Answer: (C) — Oil and water do not mix uniformly and exhibit distinct phases, making it
heterogeneous. Homogeneous mixtures (A, B, D) have uniform composition throughout.
2. The number 0.0004520 expressed in scientific notation is:
(A) 4.52 × 10⁻⁴
(B) 4.520 × 10⁻⁴
(C) 4.52 × 10⁴
(D) 452.0 × 10⁻⁶
Answer: (B) — The decimal moves four places right, giving ×10⁻⁴. The trailing zero is
significant (indicated by the decimal point), so it must be retained.
3. An atom of ⁵⁶Fe contains how many neutrons?
(A) 26
(B) 30
(C) 56
(D) 82
,Answer: (B) — Mass number (56) minus atomic number (26) equals 30 neutrons. This is the
standard calculation for determining subatomic particles.
4. The correct name for N₂O₅ is:
(A) Nitrogen oxide
(B) Dinitrogen pentoxide
(C) Nitrogen(V) oxide
(D) Dinitrogen oxide
Answer: (B) — Molecular compounds use Greek prefixes: di- for two nitrogen atoms and
penta- for five oxygen atoms. Option (C) is an older Stock system name not preferred for
molecular compounds.
5. Which of the following is an intensive property?
(A) Mass
(B) Volume
(C) Density
(D) Length
Answer: (C) — Intensive properties do not depend on the amount of substance present.
Mass, volume, and length are extensive properties that change with sample size.
SECTION II: STOICHIOMETRY AND AQUEOUS REACTIONS (CHAPTERS 3-4)
6. How many moles of CO₂ are produced when 5.0 moles of C₃H₈ undergo complete
combustion?
(A) 5.0 mol
(B) 10.0 mol
(C) 15.0 mol
(D) 20.0 mol
Answer: (C) — The balanced equation is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. The mole ratio is 1:3,
so 5.0 mol C₃H₈ × 3 = 15.0 mol CO₂.
7. What is the molarity of a solution prepared by dissolving 25.0 g of NaCl (molar mass =
58.44 g/mol) in enough water to make 500.0 mL of solution?
, (A) 0.214 M
(B) 0.428 M
(C) 0.856 M
(D) 1.71 M
Answer: (C) — Moles NaCl = 25.0/58.44 = 0.428 mol. Molarity = 0.428 mol / 0.5000 L =
0.856 M.
8. Which of the following compounds is insoluble in water?
(A) KNO₃
(B) AgCl
(C) NH₄Br
(D) Li₂SO₄
Answer: (B) — Silver chloride is a classic insoluble salt. Most silver halides are insoluble
except AgF. All ammonium and alkali metal compounds are soluble.
9. In the reaction Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s), the oxidizing agent is:
(A) Zn
(B) Cu²⁺
(C) SO₄²⁻
(D) Zn²⁺
Answer: (B) — Cu²⁺ accepts electrons (is reduced) and causes Zn to be oxidized, making it
the oxidizing agent. Zn is the reducing agent.
10. What volume of 0.250 M HCl is required to neutralize 25.0 mL of 0.400 M NaOH?
(A) 25.0 mL
(B) 40.0 mL
(C) 50.0 mL
(D) 62.5 mL
Answer: (B) — Moles NaOH = 0.0250 L × 0.400 M = 0.0100 mol. At 1:1 stoichiometry,
volume HCl = 0.0100 mol / 0.250 M = 0.0400 L = 40.0 mL.
SECTION III: GASES AND THERMOCHEMISTRY (CHAPTERS 5-6)
(15TH EDITION) BY JASON OVERBY — CHAPTERS 1-25
SECTION I: MEASUREMENT, MATTER, AND ATOMIC STRUCTURE (CHAPTERS 1-2)
1. Which of the following represents a heterogeneous mixture?
(A) NaCl dissolved in water
(B) Air
(C) Oil and water
(D) Brass
Answer: (C) — Oil and water do not mix uniformly and exhibit distinct phases, making it
heterogeneous. Homogeneous mixtures (A, B, D) have uniform composition throughout.
2. The number 0.0004520 expressed in scientific notation is:
(A) 4.52 × 10⁻⁴
(B) 4.520 × 10⁻⁴
(C) 4.52 × 10⁴
(D) 452.0 × 10⁻⁶
Answer: (B) — The decimal moves four places right, giving ×10⁻⁴. The trailing zero is
significant (indicated by the decimal point), so it must be retained.
3. An atom of ⁵⁶Fe contains how many neutrons?
(A) 26
(B) 30
(C) 56
(D) 82
,Answer: (B) — Mass number (56) minus atomic number (26) equals 30 neutrons. This is the
standard calculation for determining subatomic particles.
4. The correct name for N₂O₅ is:
(A) Nitrogen oxide
(B) Dinitrogen pentoxide
(C) Nitrogen(V) oxide
(D) Dinitrogen oxide
Answer: (B) — Molecular compounds use Greek prefixes: di- for two nitrogen atoms and
penta- for five oxygen atoms. Option (C) is an older Stock system name not preferred for
molecular compounds.
5. Which of the following is an intensive property?
(A) Mass
(B) Volume
(C) Density
(D) Length
Answer: (C) — Intensive properties do not depend on the amount of substance present.
Mass, volume, and length are extensive properties that change with sample size.
SECTION II: STOICHIOMETRY AND AQUEOUS REACTIONS (CHAPTERS 3-4)
6. How many moles of CO₂ are produced when 5.0 moles of C₃H₈ undergo complete
combustion?
(A) 5.0 mol
(B) 10.0 mol
(C) 15.0 mol
(D) 20.0 mol
Answer: (C) — The balanced equation is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. The mole ratio is 1:3,
so 5.0 mol C₃H₈ × 3 = 15.0 mol CO₂.
7. What is the molarity of a solution prepared by dissolving 25.0 g of NaCl (molar mass =
58.44 g/mol) in enough water to make 500.0 mL of solution?
, (A) 0.214 M
(B) 0.428 M
(C) 0.856 M
(D) 1.71 M
Answer: (C) — Moles NaCl = 25.0/58.44 = 0.428 mol. Molarity = 0.428 mol / 0.5000 L =
0.856 M.
8. Which of the following compounds is insoluble in water?
(A) KNO₃
(B) AgCl
(C) NH₄Br
(D) Li₂SO₄
Answer: (B) — Silver chloride is a classic insoluble salt. Most silver halides are insoluble
except AgF. All ammonium and alkali metal compounds are soluble.
9. In the reaction Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s), the oxidizing agent is:
(A) Zn
(B) Cu²⁺
(C) SO₄²⁻
(D) Zn²⁺
Answer: (B) — Cu²⁺ accepts electrons (is reduced) and causes Zn to be oxidized, making it
the oxidizing agent. Zn is the reducing agent.
10. What volume of 0.250 M HCl is required to neutralize 25.0 mL of 0.400 M NaOH?
(A) 25.0 mL
(B) 40.0 mL
(C) 50.0 mL
(D) 62.5 mL
Answer: (B) — Moles NaOH = 0.0250 L × 0.400 M = 0.0100 mol. At 1:1 stoichiometry,
volume HCl = 0.0100 mol / 0.250 M = 0.0400 L = 40.0 mL.
SECTION III: GASES AND THERMOCHEMISTRY (CHAPTERS 5-6)
